10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

x ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2018

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from              to             

Commission File Number: 0-18415

Isabella Bank Corporation

(Exact name of registrant as specified in its charter)

Michigan	38-2830092
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer identification No.)

401 North Main Street, Mount Pleasant, Michigan 48858

(Address of principal executive offices) (Zip Code)

Registrant’s telephone number, including area code (989) 772-9471

Securities registered pursuant to Section 12(b) of the Act:

Title of each class Name of each exchange on which registered

Securities registered pursuant to Section 12(g) of the Act:

Common Stock - No Par Value

(Title of Class)

Indicated by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    ¨  Yes    x  No

Indicated by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.     ¨  Yes    x  No

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     x  Yes    ¨  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (Section 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    x  Yes    ¨  No

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (Section 229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.   ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of “large accelerated filer”, “accelerated filer”, “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act (Check One).

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨	Smaller reporting company	¨
		Emerging growth company	¨
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.			¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    ¨  Yes    x  No

The aggregate market value of the voting stock held by non-affiliates of the registrant was $211,421,000 as of the last business day of the registrant’s most recently completed second fiscal quarter.

The number of common shares outstanding of the registrant’s Common Stock (no par value) was 7,873,337 as of March 11, 2019.

DOCUMENTS INCORPORATED BY REFERENCE

(Such documents are incorporated herein only to the extent specifically set forth in response to an item herein.)

Portions of the Isabella Bank Corporation Proxy Statement for its Annual Meeting of Shareholders to be held May 7, 2019 are incorporated by reference in this Form 10-K in response to Part III. The Isabella Bank Corporation Proxy Statement will be mailed on or before March 25, 2019.

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ISABELLA BANK CORPORATION

ANNUAL REPORT ON FORM 10-K

Table of Contents

PART I		4
Item 1.	Business	4
Item 1A.	Risk Factors	6
Item 1B.	Unresolved Staff Comments	9
Item 2.	Properties	9
Item 3.	Legal Proceedings	9
Item 4.	Mine Safety Disclosures	9
PART II		10
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	10
Item 6.	Selected Financial Data	12
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	35
Item 8.	Financial Statements and Supplementary Data	35
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	87
Item 9A.	Controls and Procedures	87
Item 9B.	Other Information	88
PART III		89
Item 10.	Directors, Executive Officers and Corporate Governance	89
Item 11.	Executive Compensation	89
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	89
Item 13.	Certain Relationships and Related Transactions, and Director Independence	90
Item 14.	Principal Accountant Fees and Services	90
PART IV		91
Item 15.	Exhibits and Financial Statement Schedules	91
Item 16.	Form 10-K Summary	92
SIGNATURES		93

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Forward Looking Statements

This report contains certain forward looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Rule 175 promulgated thereunder, and Section 21E of the Securities Exchange Act of 1934, as amended and Rule 3b-6 promulgated thereunder. We intend such forward looking statements to be covered by the safe harbor provisions for forward looking statements contained in the Private Securities Litigation Reform Act of 1995, and are included in this statement for purposes of these safe harbor provisions. Forward looking statements, which are based on certain assumptions and describe future plans, strategies and expectations, are generally identifiable by use of the words “believe,” “expect,” “intend,” “anticipate,” “estimate,” “project,” or similar expressions. Our ability to predict results or the actual effect of future plans or strategies is inherently uncertain. Factors which could have a material adverse effect on the operations and future prospects include, but are not limited to, changes in: interest rates, general economic conditions, federal or state tax laws, monetary and fiscal policy, the quality or composition of the loan or investment portfolio, demand for loan products, fluctuation in the value of collateral securing our loan portfolio, deposit flows, competition, cybersecurity risk, demand for financial services in our market area, and accounting principles, policies and guidelines. These risks and uncertainties should be considered in evaluating forward looking statements and undue reliance should not be placed on such statements. Further information concerning our business, including additional factors that could materially affect our consolidated financial results, is included in our filings with the SEC.

Glossary of Acronyms and Abbreviations

The acronyms and abbreviations identified below may be used throughout this Annual Report on Form 10-K or in our other SEC filings. You may find it helpful to refer back to this page while reading this report.

ACL: Allowance for Credit Losses	GAAP: U.S. generally accepted accounting principles
AFS: Available-for-sale	GLB Act: Gramm-Leach-Bliley Act of 1999
ALLL: Allowance for loan and lease losses	IFRS: International Financial Reporting Standards
AOCI: Accumulated other comprehensive income	IRR: Interest rate risk
ASC: FASB Accounting Standards Codification	ISDA: International Swaps and Derivatives Association
ASU: FASB Accounting Standards Update	JOBS Act: Jumpstart our Business Startups Act
ATM: Automated Teller Machine	LIBOR: London Interbank Offered Rate
BHC Act: Bank Holding Company Act of 1956	N/A: Not applicable
CECL: Current Expected Credit Losses	N/M: Not meaningful
CFPB: Consumer Financial Protection Bureau	NASDAQ: NASDAQ Stock Market Index
CIK: Central Index Key	NASDAQ Banks: NASDAQ Bank Stock Index
CRA: Community Reinvestment Act	NAV: Net asset value
DIF: Deposit Insurance Fund	NOW: Negotiable order of withdrawal
DIFS: Department of Insurance and Financial Services	NSF: Non-sufficient funds
Directors Plan: Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors	OCI: Other comprehensive income (loss)
Dividend Reinvestment Plan: Isabella Bank Corporation Stockholder Dividend Reinvestment Plan and Employee Stock Purchase Plan	OMSR: Originated mortgage servicing rights
Dodd-Frank Act: Dodd-Frank Wall Street Reform and Consumer Protection Act of 2010	OREO: Other real estate owned
ESOP: Employee Stock Ownership Plan	OTTI: Other-than-temporary impairment
Exchange Act: Securities Exchange Act of 1934	PBO: Projected benefit obligation
FASB: Financial Accounting Standards Board	PCAOB: Public Company Accounting Oversight Board
FDI Act: Federal Deposit Insurance Act	Rabbi Trust: A trust established to fund our Directors Plan
FDIC: Federal Deposit Insurance Corporation	SEC: U.S. Securities and Exchange Commission
FFIEC: Federal Financial Institutions Examinations Council	SOX: Sarbanes-Oxley Act of 2002
FRB: Federal Reserve Bank	Tax Act: Tax Cuts and Jobs Act, enacted December 22, 2017
FHLB: Federal Home Loan Bank	TDR: Troubled debt restructuring
Freddie Mac: Federal Home Loan Mortgage Corporation	XBRL: eXtensible Business Reporting Language
FTE: Fully taxable equivalent	Yield Curve: U.S. Treasury Yield Curve

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PART I

Item 1. Business. (Dollars in thousands)

General

Isabella Bank Corporation is a registered financial services holding company that was incorporated in September 1988 under Michigan law. The Corporation's wholly owned subsidiary, Isabella Bank, has 30 banking offices located throughout Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw counties. The area includes significant agricultural production, manufacturing, retail, gaming and tourism, and several colleges and universities.

As used in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations as well as in Item 8. Financial Statements and Supplementary Data, references to “the Corporation”, “Isabella”, “we”, “our”, “us”, and similar terms refer to the consolidated entity consisting of Isabella Bank Corporation and its subsidiary. References to Isabella Bank or the “Bank” refers to Isabella Bank Corporation’s subsidiary, Isabella Bank.

Our reportable segments are based on legal entities that account for at least 10% of net operating results. Retail banking operations for 2018, 2017, and 2016 represent approximately 90% or greater of total assets and operating results. As such, we have only one reportable segment.

We are a community bank with a focus on providing high quality, personalized service at a fair price. We offer a broad array of banking services to businesses, institutions, individuals and their families. We compete with other commercial banks, savings and loan associations, mortgage brokers, finance companies, credit unions, retail brokerage firms, and other companies providing financial services.

Lending activities include loans for commercial and agricultural operating and real estate purposes, residential real estate loans, and consumer loans. We limit lending activities primarily to local markets and have not purchased any loans from the secondary market. We do not make loans to fund leveraged buyouts, have no foreign corporate or government loans, and have limited holdings of corporate debt securities. Our general lending philosophy is to limit concentrations to individuals and business segments. For additional information related to our lending strategies and policies, see “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Deposit services offered include checking accounts, savings accounts, certificates of deposit, direct deposits, cash management services, mobile and internet banking, electronic bill pay services, and automated teller machines. We also offer full service investment management and trust services.

As of December 31, 2018, we had 371 full-time equivalent employees. We provide group life, health, accident, disability, and other insurance programs as well as a number of other employee benefit programs. None of our workforce is subject to collective bargaining agreements.

Available Information

Our SEC filings (including our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Definitive Proxy Statements, Current Reports on Form 8-K and amendments to those reports) are available through our website (www.isabellabank.com). We will provide paper copies of our SEC reports free of charge upon request by a shareholder.

The SEC maintains a website (www.sec.gov) that contains reports, proxy and information statements and other information regarding Isabella Bank Corporation (CIK #0000842517) and other issuers.

Supervision and Regulation

The earnings and growth of the banking industry are affected by the credit policies of monetary authorities, including the FRB. An important function of the FRB is to regulate the national supply of bank credit in order to combat recessions and respond to inflationary pressures. Among the instruments of monetary policy used by the FRB to implement these objectives are open market operations in U.S. Treasury and U.S. Government Agency securities, changes in the discount rate on member bank borrowings, and changes in reserve requirements against member bank deposits. These methods are used in varying combinations to influence overall growth of bank loans, investments and deposits and also affect interest rates charged on loans or paid for deposits. The monetary policies of the FRB have had a significant effect on the operating results of commercial banks and related financial service providers in the past and are expected to continue to do so in the future. The effect of such policies upon our future business and earnings cannot be predicted.

We, as a financial holding company, are regulated under the BHC Act, and are subject to the supervision of the FRB. We are registered as a financial services holding company with the FRB and are subject to reporting requirements and inspections and

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audits. Under FRB policy, we are expected to act as a source of financial strength to the Bank and to commit resources to support its subsidiaries. This support may be required at times when, in the absence of such FRB policy, it would not otherwise be required to provide support.

Under Michigan law, if the capital of a Michigan state chartered bank has become impaired by losses or otherwise, the Commissioner of the DIFS may require that the deficiency in capital be met by assessment upon the bank’s shareholders. Each shareholder would be responsible for a pro rata share of the deficiency, based on the amount of capital stock held by each shareholder. If an assessment is not paid by any shareholder within 30 days of the date of notice to the shareholder, sale of their stock will occur in order to pay such assessment.

Any capital loans by a bank holding company to any of its subsidiary banks are subordinate in right of payment to deposits and to certain other indebtedness of such subsidiary bank. In the event of a bank holding company’s bankruptcy, any commitment by the bank holding company to a federal bank regulatory agency to maintain the capital of a subsidiary bank will be assumed by the bankruptcy trustee and entitled to a priority of payment. This priority would apply to guarantees of capital plans under the FDIC Improvement Act of 1991.

SOX contains important requirements for public companies in the area of financial disclosure and corporate governance. In accordance with Section 302(a) of SOX, written certifications by our principal executive, financial, and accounting officers are required. These certifications attest that our quarterly and annual reports filed with the SEC do not contain any untrue statement of a material fact (see the certifications filed as Exhibits 31 (a) and (b) to this Form 10-K for such certification of consolidated financial statements and other information for this 2018 Form 10-K). We have also implemented a program designed to comply with Section 404 of SOX, which included the identification of significant processes and accounts, documentation of the design effectiveness over process and entity level controls, and testing of the operating effectiveness of key controls. See Item 9A. Controls and Procedures for our evaluation of disclosure controls and procedures and internal control over financial reporting.

Certain additional information concerning regulatory guidelines for capital adequacy and other regulatory matters is presented herein under the caption “Capital” in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations and in “Note 9 – Off-Balance-Sheet Activities, Commitments and Other Matters” and “Note 10 – Minimum Regulatory Capital Requirements” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Isabella Bank

The Bank is supervised and regulated by DIFS and the FRB. These agencies and federal and state laws extensively regulate various aspects of the banking business including, among other things, permissible types and amounts of loans, investments and other activities, capital adequacy, branching, interest rates on loans and deposits, and the safety and soundness of banking practices.

Our deposits are insured up to applicable limits by the DIF of the FDIC and are subject to deposit insurance assessments to maintain the DIF. The FDIC assesses insurance premiums based upon a financial ratios method that takes into account asset and capital levels and supervisory ratings.

Banking laws and regulations restrict transactions by insured banks owned by a bank holding company. These restrictions include loans to and certain purchases from the parent holding company, non-bank and bank subsidiaries of the parent holding company. Additional restrictions apply to principal shareholders, officers, directors and their affiliates, and investments by the subsidiary bank in the shares or securities of the parent holding company (or any of the other non-bank or bank affiliates), or acceptance of such shares or securities as collateral security for loans to any borrower.

The Bank is subject to legal limitations on the frequency and amount of dividends that can be paid to Isabella Bank Corporation. For example, a Michigan state chartered bank may not declare a cash dividend or a dividend in kind except out of net profits then on hand after deducting all losses and bad debts, and then only if it will have a surplus amounting to not less than 20% of its capital after the payment of the dividend. Moreover, a Michigan state chartered bank may not declare or pay any cash dividend or dividend in kind until the cumulative dividends on its preferred stock, if any, have been paid in full. Further, if the surplus of a Michigan state chartered bank is at any time less than the amount of its capital, before the declaration of a cash dividend or dividend in kind, it must transfer to surplus not less than 10% of its net profits for the preceding six months (in the case of quarterly or semi-annual dividends) or the preceding two consecutive six month periods (in the case of annual dividends).

The payment of dividends by Isabella Bank Corporation and the Bank is also affected by various regulatory requirements and policies, such as the requirement to keep adequate capital in compliance with regulatory guidelines. Federal laws impose

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further restrictions on the payment of dividends by insured banks that fail to meet specified capital levels. The FDIC may prevent an insured bank from paying dividends if the bank is in default of payment of any assessment due to the FDIC. In addition, payment of dividends by a bank may be prevented by the applicable federal regulatory authority if such payment is determined, by reason of the financial condition of such bank, to be an unsafe and unsound banking practice. The FRB and the FDIC have issued policy statements providing that bank holding companies and insured banks should generally pay dividends only out of current operating earnings. Additionally, the FRB Board of Governors requires a bank holding company to notify the FRB prior to increasing its cash dividend by more than 10% over the prior year.

The aforementioned regulations and restrictions may limit our ability to obtain funds from the Bank for our cash needs, including payment of dividends and operating expenses.

The activities and operations of the Bank are also subject to various federal and state laws and regulations.

Item 1A. Risk Factors.

In the normal course of business, we are exposed to various risks. These risks, if not managed correctly, could have a significant impact on our earnings, capital, share price, and ability to pay dividends. In order to effectively monitor and control the following risks, we utilize an enterprise risk model. We balance our strategic goals, including revenue and profitability objectives, with associated risks through the use of policies, systems, and procedures which have been adopted to identify, assess, control, monitor, and manage each risk area. We continually review the adequacy and effectiveness of these policies, systems, and procedures.

Our enterprise risk process covers each of the following areas.

Changes in credit quality and required allowance for loan and lease losses

To manage the credit risk arising from lending activities, our most significant source of credit risk, we maintain sound underwriting policies and procedures. We continuously monitor asset quality in order to manage our credit risk to determine the appropriateness of valuation allowances. These valuation allowances take into consideration various factors including, but not limited to, local, regional, and national economic conditions.

We maintain an ALLL to reserve for estimated incurred loan losses within our loan portfolio. The level of the ALLL reflects our evaluation of industry concentrations; specific credit risks; loan loss experience; loan portfolio quality; and economic, political and regulatory conditions. The determination of the appropriate level of the ALLL inherently involves a high degree of subjectivity and requires us to make significant estimates, all of which may undergo material changes.

Changes in economic conditions

An economic downturn within our local markets, as well as downturns in the state, national, or global markets, could negatively impact household and corporate incomes. This could lead to decreased demand for both loan and deposit products and lead to an increase of customers who fail to pay interest or principal on their loans. We continually monitor key economic indicators in an effort to anticipate the possible effects of downturns in the local, regional, and national economies.

Our success depends primarily on the general economic conditions of the State of Michigan and the specific local markets in which we operate. Unlike banks that are more geographically diversified, we provide banking and financial services to customers located primarily in theClare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw counties in Michigan. The local economic conditions in these areas have a significant impact on the demand for our products and services, as well as the ability of our customers to repay loans, the value of the collateral securing loans, and the stability of our deposit funding sources. A significant decline in general economic conditions, caused by inflation, recession, acts of terrorism, outbreak of hostilities or other international or domestic occurrences, unemployment, changes in securities markets or other factors could impact these local economic conditions and, in turn, have a material adverse effect on our financial condition and results of operations.

Interest rate risk

IRR results from the timing differences in the maturity or repricing frequency of a financial institution’s interest earning assets and its interest bearing liabilities. We monitor the potential effects of changes in interest rates through simulations and gap analyses. To help mitigate the effects of changes in interest rates, we make significant efforts to stagger projected cash flows and maturities of interest sensitive assets and liabilities.

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Liquidity risk

Liquidity risk is the risk to earnings or capital arising from our inability to meet our obligations when they come due without incurring unacceptable costs. Liquidity risk includes the inability to manage unplanned changes in funding sources, or failure to address changes in market conditions that affect the ability to liquidate assets quickly and with minimal loss in value. We have significant borrowing capacity through correspondent banks and the ability to sell certain investments to fund potential cash shortages, which we may use to help mitigate this risk.

The value of investment securities may be negatively impacted by fluctuations in the market

A volatile, illiquid market or decline in credit quality could require us to recognize an OTTI loss related to the investment securities held in our portfolio. We consider many factors in determining whether an OTTI exists including the length of time and extent to which fair value has been less than cost, the investment credit rating, and the probability that the issuer will be unable to pay the amount when due. The presence of these factors could lead to impairment charges. These risks are mitigated by the fact that we do not intend to sell the security in an unrealized loss position and it is more likely than not that we will not have to sell the security before recovery of its cost basis.

Operational risk

Operational risk is the risk of loss resulting from inadequate or failed internal processes, people, and systems, or external events and includes reputation risk and transaction risk. Reputation risk is managed by developing and retaining marketplace confidence in handling customers’ financial transactions in an appropriate manner and protecting our safety and soundness. Transaction risk includes losses from fraud, error, the inability to deliver products or services, and loss or theft of information. Transaction risk also encompasses product development and delivery, transaction processing, information technology systems, and the internal control environment.

To minimize potential losses due to operational risks, we have established a robust system of internal controls that is regularly tested by our internal audit department in conjunction with the services of certified public accounting firms who assist in performing such internal audit work. The focus of these internal audit procedures is to verify the validity and appropriateness of various transactions, processes, and controls. The results of these procedures are reported to our Audit Committee.

The adoption of, violations of, or nonconformance with laws, rules, regulations, or prescribed practices

The financial services industry and public companies are extensively regulated and must meet regulatory standards set by the FDIC, DIFS, FRB, FASB, SEC, PCAOB, CFPB, and other regulatory bodies. Federal and state laws and regulations are designed primarily to protect deposit insurance funds and consumers, and not necessarily to benefit our shareholders. The nature, extent, and timing of the adoption of significant new laws, changes in existing laws, or repeal of existing laws may have a material impact on our business, results of operations, and financial condition, the effect of which is impossible to predict at this time.

Our compliance department annually assesses the adequacy and effectiveness of our processes for controlling and managing our principal compliance risks.

Changes to the financial services industry as a result of regulatory changes or actions, or significant litigation

The financial services industry is extensively regulated by state and federal regulation that governs almost all aspects of our operations. Laws and regulations may change from time-to-time and are primarily intended for the protection of consumers, depositors, and the deposit insurance fund. The impact of any changes to laws and regulations or other actions by regulatory agencies may negatively impact us or our ability to increase the value of our business. Regulatory authorities have extensive discretion in connection with their supervisory and enforcement activities, including the imposition of restrictions on the operation of an institution, the classification of assets by the institution, and the appropriateness of an institution’s ALLL. Future regulatory changes or accounting pronouncements may increase our regulatory capital requirements or adversely affect our regulatory capital levels. Additionally, actions by regulatory agencies or significant litigation against us could require the dedication of significant time and resources to defend our business and may lead to penalties.

We may not adjust to changes in the financial services industry

Our financial performance depends in part on our ability to maintain and grow our core deposit customer base and expand our financial services to our existing and new customers. The increasingly competitive environment is, in part, a result of changes in technology and product delivery systems and the accelerating pace of consolidation among financial service providers. New competitors may emerge to increase the degree of competition for our products and services. Financial services and products are also constantly changing. Our financial performance is dependent upon customer demand for our products and services,

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our ability to develop and offer competitive financial products and services, and our ability to adapt to enhancements in financial technology.

We may be required to recognize an impairment of goodwill

Goodwill represents the excess of the amounts paid to acquire subsidiaries over the fair value of their net assets at the date of acquisition. The majority of the recorded goodwill is related to acquisitions of other banks, which were subsequently merged into Isabella Bank. If it is determined that the goodwill is impaired, we must write-down the goodwill by the amount of the impairment.

We may face pressure from purchasers of our residential mortgage loans to repurchase loans sold or reimburse purchasers for losses related to such loans

We generally sell the fixed rate long-term residential mortgage loans we originate to the secondary market. The purchasers of residential mortgage loans, such as government sponsored entities, increased their efforts to require sellers of residential mortgage loans to either repurchase loans previously sold, or reimburse the purchasers for losses incurred on foreclosed loans due to actual or alleged failure to strictly conform to the terms of the contract.

Consumers may decide not to use banks to complete their financial transactions

Technology and other changes are allowing customers to complete financial transactions without the involvement of banks. For example, consumers can now pay bills and transfer funds directly without banks. The process of eliminating banks as intermediaries in financial transactions could result in the loss of fee income, as well as the loss of customer deposits and income generated from those deposits.

Unauthorized disclosure of sensitive or confidential client or customer information, whether through cyber attacks, breach of computer systems or other means

Our products, services and systems are accessed through critical company or third-party operations. This involves the storage, processing and transmission of sensitive data, including proprietary or confidential data, regulated data, and personal information of employees and customers. Successful breaches, employee wrongdoing, or human or technological error could result in unauthorized access to, disclosure, modification, misuse, loss, or destruction of company, customer, or other third party data or systems. Examples include theft of sensitive, regulated, or confidential data including personal information; loss of access to critical data or systems through ransomware, destructive attacks or other means; and business delays, service or system disruptions or denials of service.

Cybersecurity incidents have increased in number and severity and it is expected that these trends will continue. Should we, or third parties we do business with, fall victim to successful cyber attacks or experience other cybersecurity incidents, including the loss of personally identifiable customer or other sensitive data, the result could severely damage our reputation, expose us to the risks of litigation and liability, disrupt our operations and increase cybersecurity or other insurance premiums.

We have cybersecurity insurance, in the event a cybersecurity attack were to occur, covering expenses related to notification, credit monitoring, investigation, crisis management, public relations, and legal advice. In addition, we maintain insurance to cover restoration of data, certain physical damage or third-party injuries caused by potential cybersecurity incidents. However, damage and claims arising from such incidents may not be covered or may exceed the amount of any insurance available. Insurance policies are reviewed annually in detail.

A strong reputation is vital and requires utmost protection. An operating incident, significant cybersecurity disruption, or other adverse event may have a negative impact on our reputation which could make it more difficult for us to compete successfully for new opportunities, obtain necessary regulatory approvals, or severely reduce consumer demand for our products.

Our estimates and assumptions may be incorrect

Our consolidated financial statements conform with GAAP, which require us to make estimates and assumptions that affect the amounts reported in the consolidated financial statements. Estimates are based on information available to us at the time the estimates are made. Actual results could differ from estimates. For further discussion regarding significant accounting estimates, see “Note 1 – Nature of Operations and Summary of Significant Accounting Policies” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

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Disruption of infrastructure

Our operations depend upon our technological and physical infrastructure, including our equipment and facilities. Extended disruption of our vital infrastructure by fire, power loss, natural disaster, telecommunications failure, computer hacking and viruses, or other events outside of our control, could have a significant impact on our operations. We have developed and tested disaster recovery plans for all significant aspects of our operations.

Anti-takeover provisions

Our articles of incorporation include anti-takeover provisions that require a two-thirds majority vote to approve a sale of the Corporation. Additionally, changes to our articles of incorporation must be approved by a two-thirds majority vote of our shareholders. These provisions may make our stock less attractive to potential shareholders.

Item 1B. Unresolved Staff Comments.

None.

Item 2. Properties.

Our executive offices are located at 401 North Main Street in Mount Pleasant, Michigan. In addition to this location, we own 29 branches, two operations centers, our previous main office building and vacant land. We also lease property in Saginaw, Michigan which serves as a full-service branch. Our facilities' current, planned, and best use is for conducting our current activities, with the exception of our previous main office location which is vacant. We continually monitor and assess the need for expansion and/or improvement of all facilities. In our opinion, each facility has sufficient capacity and is in good condition.

Item 3. Legal Proceedings.

We are not involved in any material legal proceedings. We are involved in ordinary, routine litigation incidental to our business; however, no such routine proceedings are expected to result in any material adverse effect on our consolidated operations, earnings, financial condition, or cash flows.

Item 4. Mine Safety Disclosures.

Not applicable.

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PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Common Stock and Dividend Information

Our authorized common stock consists of 15,000,000 shares, of which 7,870,969 shares are issued and outstanding as of December 31, 2018. As of that date, there were 3,083 shareholders of record.

Our common stock is traded in the over-the-counter market.  Our common stock is quoted on the OTCQX market tier of the OTC Markets Group Inc.’s ("OTC Markets") electronic quotation system (www.otcmarkets.com) under the symbol “ISBA”.  Other trades in our common stock occur in privately negotiated transactions from time to time of which we may have little or no information.

We have reviewed the information available as to the range of reported high and low bid quotations, including high and low bid information as reported by OTC Markets. The following table sets forth our compilation of that information for the periods indicated. Price information obtained from OTC Markets reflects inter-dealer prices, without retail mark up, mark down, or commissions and may not necessarily represent actual transactions. The following compiled data is provided for information purposes only and should not be viewed as indicative of the actual or market value of our common stock.

	Number of Common Shares	Sale Price
		Low		High
2018
First Quarter	65,782	$	26.11	$	28.25
Second Quarter	78,922	26.25		27.25
Third Quarter	86,032	26.05		27.65
Fourth Quarter	73,364	22.50		27.00
	304,100
2017
First Quarter	96,592	$	27.60	$	29.00
Second Quarter	64,160	27.60		28.45
Third Quarter	66,000	27.65		29.10
Fourth Quarter	60,227	27.99		29.95
	286,979

The following table sets forth the cash dividends paid for the following quarters:

	Per Share
	2018		2017
First Quarter	$	0.26	$	0.25
Second Quarter	0.26		0.25
Third Quarter	0.26		0.26
Fourth Quarter	0.26		0.26
Total	$	1.04	$	1.02

We have adopted and publicly announced a common stock repurchase plan. The plan was last amended on August 22, 2018, to allow for the repurchase of an additional 200,000 shares of common stock after that date. These authorizations do not have expiration dates. As shares are repurchased under this plan, they are retired and revert back to the status of authorized, but unissued, shares.

10

The following table provides information for the unaudited three month period ended December 31, 2018, with respect to our common stock repurchase plan:

	Common Shares Repurchased			Total Number of Common Shares Purchased as Part of Publicly Announced Plan or Program	Maximum Number of Common Shares That May Yet Be Purchased Under the Plans or Programs
	Number	Average Price Per Common Share
Balance, September 30					200,244
October 1 - 31	2,797	$	26.81	2,797	197,447
November 1 - 30	3,325	25.26		3,325	194,122
December 1 - 31	26,468	24.07		26,468	167,654
Balance, December 31	32,590	$	24.42	32,590	167,654

Information concerning securities authorized for issuance under equity compensation plans appears under Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Stock Performance

The following graph compares the cumulative total shareholder return on our common stock for the last five years with the cumulative total return on (1) NASDAQ, which is comprised of all United States common shares traded on the NASDAQ and (2) the NASDAQ Banks, which is comprised of bank and bank holding company common shares traded on the NASDAQ over the same period. The graph assumes the value of an investment in the Corporation's common stock and each index was $100 at December 31, 2013 and all dividends were reinvested.

Year	ISBA		NASDAQ		NASDAQ Banks
12/31/2013	$	100.00	$	100.00	$	100.00
12/31/2014	98.00		114.83		104.92
12/31/2015	135.30		122.99		114.20
12/31/2016	130.50		134.02		157.56
12/31/2017	137.20		173.86		166.15
12/31/2018	114.10		168.98		139.28

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Item 6. Selected Financial Data.

Results of Operations (Dollars in thousands except per share amounts)

The following table outlines the results of operations and provides certain key performance measures as of, and for the years ended, December 31:

	2018			2017			2016			2015			2014
INCOME STATEMENT DATA
Interest income	$	63,864		$	58,413		$	53,666		$	51,502		$	51,148
Interest expense	15,631			12,494			10,865			10,163			9,970
Net interest income	48,233			45,919			42,801			41,339			41,178
Provision for loan losses	978			253			(135		)	(2,771		)	(668		)
Noninterest income	10,946			10,812			11,108			10,359			9,325
Noninterest expenses	42,817			40,225			37,897			36,051			35,103
Federal income tax expense (1)	1,363			3,016			2,348			3,288			2,344
Net income	$	14,021		$	13,237		$	13,799		$	15,130		$	13,724
PER SHARE
Basic earnings	$	1.78		$	1.69		$	1.77		$	1.95		$	1.77
Diluted earnings	$	1.74		$	1.65		$	1.73		$	1.90		$	1.74
Dividends	$	1.04		$	1.02		$	0.98		$	0.94		$	0.89
Tangible book value (2)	$	18.68		$	18.63		$	17.80		$	17.33		$	16.52
Quoted market value
High	$	28.25		$	29.95		$	29.90		$	29.90		$	24.00
Low	$	22.50		$	27.60		$	27.25		$	22.00		$	21.73
Close (3)	$	22.56		$	28.25		$	27.85		$	29.90		$	22.50
Common shares outstanding (3)	7,870,969			7,857,293			7,821,069			7,799,867			7,776,274
PERFORMANCE RATIOS
Return on average total assets	0.77		%	0.75		%	0.82		%	0.95		%	0.90		%
Return on average shareholders' equity	7.26		%	6.75		%	7.12		%	8.33		%	8.06		%
Return on average tangible shareholders' equity	9.14		%	9.09		%	9.95		%	11.46		%	10.80		%
Net interest margin yield (FTE) (1)	2.97		%	3.03		%	3.00		%	3.10		%	3.24		%
BALANCE SHEET DATA (3)
Gross loans	$	1,128,707		$	1,091,519		$	1,010,615		$	850,492		$	836,550
AFS securities	$	494,834		$	548,730		$	554,671		$	656,837		$	561,394
Total assets	$	1,837,307		$	1,813,130		$	1,732,151		$	1,668,112		$	1,549,543
Deposits	$	1,292,693		$	1,265,258		$	1,195,040		$	1,164,563		$	1,074,484
Borrowed funds	$	340,299		$	344,878		$	337,694		$	309,732		$	289,709
Shareholders' equity	$	195,519		$	194,905		$	187,899		$	183,971		$	174,594
Gross loans to deposits	87.31		%	86.27		%	84.57		%	73.03		%	77.86		%
ASSETS UNDER MANAGEMENT (3)
Loans sold with servicing retained	$	259,481		$	266,789		$	272,882		$	287,029		$	288,639
Assets managed by our Investment and Trust Services Department	$	447,487		$	478,146		$	427,693		$	405,109		$	383,878
Total assets under management	$	2,544,275		$	2,558,065		$	2,432,726		$	2,360,250		$	2,222,060
ASSET QUALITY (3)
Nonperforming loans to gross loans	0.65		%	0.31		%	0.17		%	0.09		%	0.50		%
Nonperforming assets to total assets	0.42		%	0.20		%	0.11		%	0.07		%	0.33		%
ALLL to gross loans	0.74		%	0.71		%	0.73		%	0.87		%	1.21		%
CAPITAL RATIOS (3)
Shareholders' equity to assets	10.64		%	10.75		%	10.85		%	11.03		%	11.27		%
Tier 1 leverage	8.72		%	8.54		%	8.56		%	8.52		%	8.59		%
Common equity tier 1 capital	12.58		%	12.23		%	12.39		%	13.44		%	N/A
Tier 1 risk-based capital	12.58		%	12.23		%	12.39		%	13.44		%	14.08		%
Total risk-based capital	13.26		%	12.86		%	13.04		%	14.17		%	15.19		%

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% for all prior periods.

⁽²⁾ Tangible book value calculations include unrealized gain/loss on AFS securities.

⁽³⁾ At end of year

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The following table outlines our interim results of operations and key performance measures as of, and for the unaudited periods ended:

	Quarter to Date
	December 31 2018		September 30 2018			June 30 2018		March 31 2018		December 31 2017		September 30 2017		June 30 2017		March 31 2017
Total interest income	$	16,611	$	16,419		$	15,713	$	15,121	$	15,078	$	14,976	$	14,498	$	13,861
Total interest expense	4,258		4,231			3,741		3,401		3,435		3,200		3,028		2,831
Net interest income	12,353		12,188			11,972		11,720		11,643		11,776		11,470		11,030
Provision for loan losses	342		(76		)	328		384		168		49		9		27
Noninterest income	2,860		2,863			2,736		2,487		2,710		2,698		2,788		2,616
Noninterest expenses	10,865		11,072			10,784		10,096		10,628		10,139		9,507		9,951
Federal income tax expense	476		359			263		265		836		750		898		532
Net income	$	3,530	$	3,696		$	3,333	$	3,462	$	2,721	$	3,536	$	3,844	$	3,136
PER SHARE
Basic earnings	$	0.45	$	0.47		$	0.42	$	0.44	$	0.35	$	0.45	$	0.49	$	0.40
Diluted earnings	0.44		0.46			0.41		0.43		0.34		0.44		0.48		0.39
Dividends	0.26		0.26			0.26		0.26		0.26		0.26		0.25		0.25
Quoted market value (1)	22.56		26.75			26.65		27.40		28.25		29.00		28.00		27.60
Tangible book value (2)	18.68		19.44			19.36		19.16		18.96		18.82		18.62		18.34

⁽¹⁾ At end of period

⁽²⁾ Tangible book value calculations include unrealized gain/loss on AFS securities.

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Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations.

ISABELLA BANK CORPORATION FINANCIAL REVIEW

(Dollars in thousands except per share amounts)

The following is management’s discussion and analysis of the financial condition and results of our operations. This discussion and analysis is intended to provide a better understanding of the consolidated financial statements and statistical data included elsewhere in this Annual Report on Form 10-K.

Executive Summary

We reported net income of $14,021 and earnings per common share of $1.78 for the year ended December 31, 2018. Net income and earnings per common share for the year ended December 31, 2017 were $13,237 and $1.69, respectively. Interest income for the year ended December 31, 2018 increased $5,451 when compared to 2017 primarily as the result of strong loan growth, which totaled $37,188 during 2018. Net interest income increased by $2,314 for the year ended December 31, 2018 in comparison to 2017. The provision for loan losses increased by $725 and was the result of loan growth, increased charge-offs, and an increase in criticized assets largely related to our agricultural loan portfolio. Noninterest expenses for the year ended December 31, 2018 exceeded noninterest expenses in 2017 due to increased compensation and benefits, certain loan expenses and increased costs related to upgrades with technology and network security. Additionally in 2017, noninterest expenses were reduced by a settlement with an insurance claims administrator in favor of Isabella Bank. Net income in 2018 has benefited from the lower federal statutory tax rate established by the Tax Act.

As of December 31, 2018, total assets and assets under management were $1,837,307 and $2,544,275, respectively. Assets under management include loans sold and serviced of $259,481 and assets managed by our Investment and Trust Services Department of $447,487, in addition to assets on our consolidated balance sheet. In 2018, the loan growth of $37,188 was attributable to commercial portfolio growth of $24,770 and increases in residential real estate and consumer loans of $13,526, offset by a $1,108 decline in the agricultural portfolio. Loan growth was funded through maturities and the receipt of principal payments in the AFS securities portfolio and growth in total deposits. All regulatory capital ratios for the Bank exceeded the minimum thresholds to be considered a "well capitalized" institution.

Our net yield on interest earning assets (FTE) was 2.97% for 2018 and experienced a slight decline in comparison to prior periods. The FRB increased short-term interest rates during each quarter of 2018. Over the next few years, we anticipate incremental improvement in our net yield on interest earning assets as a result of a combination of our asset mix shifting to an increasing percentage of loans compared to investment securities, strategic growth in loans, and market driven loan pricing. We are committed to increasing earnings and shareholder value through growth in our loan portfolio, growth in our investment and trust services, increasing our presence within our geographic footprint, and managing operating costs.

The current interest rate environment, which consists of low rates and a flat yield curve, is having an impact on investor confidence in the financial sector. Interest rate environments with flattened yield curves generally result in a decline in the market price of bank stocks. In early 2017, the difference between the yields of the 2-year treasury and 10-year treasury notes was above 120 basis points. Since the first part of December 2018, the same yield variance has remained below 20 basis points, which is not favorable for financial institutions.

Bank stocks, in general, were negatively impacted in 2018 by the interest rate environment. The Nasdaq Bank Stock Index declined 19% in the fourth quarter of 2018. The price per share of our common stock fell approximately 16% from $26.75 on September 28, 2018 to $22.56 on December 31, 2018. Even within this declining period, there were a few trades that we were aware of at $25.95 per share between December 14, 2018 and December 24, 2018. Historically, our stock price lags market changes, both upward and downward, 60 to 90 days.

Our Board of Directors and management team closely monitor our stock price, and are focused on improving the metrics which should serve to have a favorable impact on the stock price. In the second half of 2018, we engaged the services of an investor relations firm whose mission is to help build brand awareness of Isabella Bank Corporation in the investment community, and get management in front of selected investment professionals and advisors through small group presentations. The feedback from this strategy has been positive thus far.

Recent Legislation

The Dodd-Frank Act of 2010, has already had, and is expected to continue to have, a negative impact on our operating results. The Dodd-Frank Act established the CFPB which has made significant changes in the regulation of financial institutions aimed at strengthening the oversight of the federal government over the operation of the financial services sector and increasing the

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protection of consumers. Recent regulations issued by the CFPB regarding consumer lending, including residential mortgage lending, have increased our compensation expenses and this trend is expected to continue.

On July 2, 2013, the FRB published revised BASEL III Capital standards for banks. The rules redefine what is included or deducted from equity capital, changes risk weighting for certain on and off-balance sheet assets, increases the minimum required equity capital to be considered well capitalized, and introduces a capital cushion buffer. The rules, which are being gradually phased in between 2015 and 2019, are not expected to have a material impact on the Corporation but will require us to hold more capital than we have historically.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21%, effective January 1, 2018, and eliminated the corporate alternative minimum tax which can be carried forward and used to reduce future income tax. The tax law provided for a wide array of changes, only some of which had a direct impact on our federal income tax expense. Some of these changes included, but are not limited to, the following items: limits to the deduction for net interest expense; immediate expense (for tax purposes) for certain qualified depreciable assets; elimination or reduction of certain deductions related to meals and entertainment expenses; and limits to the deductibility of deposit insurance premiums.

Reclassifications

Certain amounts reported in management's discussion and analysis of financial condition and results of operations for 2017 and 2016 have been reclassified to conform with the 2018 presentation.

Other

We have not received any notices of regulatory actions as of March 12, 2019.

CRITICAL ACCOUNTING POLICIES

Our significant accounting policies are set forth in “Note 1 – Nature of Operations and Summary of Significant Accounting Policies” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data. Of these significant accounting policies, we consider our policies regarding the ALLL, acquisition intangibles and goodwill, and the determination of the fair value and assessment of OTTI of investment securities to be our most critical accounting policies.

The ALLL requires our most subjective and complex judgment. Changes in economic conditions and other external factors can have a significant impact on the ALLL and, therefore, the provision for loan losses and results of operations. We have developed policies and procedures for assessing the appropriateness of the ALLL, recognizing that this process requires a number of assumptions and estimates with respect to our loan portfolio. Our assessments may be impacted in future periods by changes in economic conditions, and the discovery of information with respect to borrowers which is not known to us at the time of the issuance of the consolidated financial statements. For additional discussion concerning our ALLL and related matters, see “Allowance for Loan and Lease Losses” and “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

U.S. generally accepted accounting principles require that we determine the fair value of the assets and liabilities of an acquired entity, and record the fair value on the date of acquisition. We employ a variety of measures in the determination of the fair value, including the use of discounted cash flow analysis, market appraisals, and projected future revenue streams. For certain items that we believe we have the appropriate expertise to determine the fair value, we may choose to use our own calculations of the value. In other cases, where the value is not easily determined, we consult with independent experts to determine the fair value of the identified asset or liability. Once valuations have been adjusted, the net difference between the price paid for the acquired entity and the net value of assets acquired on our balance sheet, including identifiable intangibles, is recorded as goodwill. Acquisition intangibles and goodwill are qualitatively evaluated to determine if it is more likely than not that the carrying balance is impaired on at least an annual basis.

AFS securities are carried at fair value with changes in the fair value included as a component of other comprehensive income. Declines in the fair value of AFS securities below their cost that are other-than-temporary are reflected as realized losses in the consolidated statements of income. We evaluate AFS securities for indications of losses that are considered other-than-temporary, if any, on a regular basis. The market values for most AFS investment securities are typically obtained from outside sources and applied to individual securities within the portfolio. Municipal securities for which no readily determinable market values are available are priced using fair value curves which most closely match the securities' characteristics.

15

Average Balances, Interest Rates, and Net Interest Income

The following schedules present the daily average amount outstanding for each major category of interest earning assets, non-earning assets, interest bearing liabilities, and noninterest bearing liabilities for the last three years. These schedules also present an analysis of interest income and interest expense for the periods indicated. All interest income is reported on a FTE basis using a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016. Loans in nonaccrual status, for the purpose of the following computations, are included in the average loan balances. FRB and FHLB restricted equity holdings are included in accrued income and other assets.

	Year Ended December 31
	2018							2017							2016
	Average Balance			Tax Equivalent Interest		Average Yield / Rate		Average Balance			Tax Equivalent Interest		Average Yield / Rate		Average Balance			Tax Equivalent Interest		Average Yield / Rate
INTEREST EARNING ASSETS
Loans	$	1,120,021		$	49,229	4.40	%	$	1,040,630		$	43,537	4.18	%	$	922,333		$	38,537	4.18	%
Taxable investment securities (1)	341,095			8,294		2.43	%	361,783			8,564		2.37	%	392,810			8,746		2.23	%
Nontaxable investment securities	191,281			7,115		3.72	%	202,375			9,126		4.51	%	205,450			9,351		4.55	%
Fed funds sold	4			—		—	%	663			5		0.75	%	—			—		—	%
Other	35,719			1,062		2.97	%	26,815			737		2.75	%	25,557			668		2.61	%
Total earning assets	1,688,120			65,700		3.89	%	1,632,266			61,969		3.80	%	1,546,150			57,302		3.71	%
NONEARNING ASSETS
Allowance for loan losses	(8,094		)					(7,607		)					(7,638		)
Cash and demand deposits due from banks	19,770							19,309							18,178
Premises and equipment	28,349							28,933							28,670
Accrued income and other assets	87,895							99,456							101,995
Total assets	$	1,816,040						$	1,772,357						$	1,687,355
INTEREST BEARING LIABILITIES
Interest bearing demand deposits	$	229,411		$	267	0.12	%	$	213,648		$	232	0.11	%	$	203,198		$	163	0.08	%
Savings deposits	361,743			1,698		0.47	%	356,963			1,091		0.31	%	336,859			663		0.20	%
Time deposits	454,916			7,296		1.60	%	433,562			5,486		1.27	%	429,731			5,010		1.17	%
Borrowed funds	344,352			6,370		1.85	%	352,400			5,685		1.61	%	319,049			5,029		1.58	%
Total interest bearing liabilities	1,390,422			15,631		1.12	%	1,356,573			12,494		0.92	%	1,288,837			10,865		0.84	%
NONINTEREST BEARING LIABILITIES
Demand deposits	224,777							208,988							194,892
Other	7,597							10,641							9,841
Shareholders’ equity	193,244							196,155							193,785
Total liabilities and shareholders’ equity	$	1,816,040						$	1,772,357						$	1,687,355
Net interest income (FTE)				$	50,069						$	49,475						$	46,437
Net yield on interest earning assets (FTE)						2.97	%						3.03	%						3.00	%

⁽¹⁾ Includes taxable AFS securities and equity securities

Net interest income is the amount by which interest income on earning assets exceeds the interest expense on interest bearing liabilities. Net interest income is influenced by changes in the balance and mix of assets and liabilities and market interest rates. We exert some control over these factors; however, FRB monetary policy and competition have a significant impact. For

16

analytical purposes, net interest income is adjusted to an FTE basis by includng the income tax savings from interest on tax exempt loans, and nontaxable investment securities, thus making year to year comparisons more meaningful. The FTE adjustment is based on a federal income tax rate of 21% for 2018 and 34% for 2017 and 2016.

Volume and Rate Variance Analysis

The following table sets forth the effect of volume and rate changes on interest income and expense for the periods indicated. For the purpose of this table, changes in interest due to volume and rate were determined as follows:

Volume—change in volume multiplied by the previous period's FTE rate.

Rate—change in the FTE rate multiplied by the previous period's volume.

All interest income presented in the table below is reported on a FTE basis using a federal income tax rate of 21% for 2018 and 34% for 2017 and 2016. The change in interest due to both volume and rate has been allocated to volume and rate changes in proportion to the relationship of the absolute dollar amounts of the change in each.

	2018 Compared to 2017   Increase (Decrease) Due to									2017 Compared to 2016   Increase (Decrease) Due to
	Volume			Rate			Net			Volume			Rate			Net
Changes in interest income
Loans	$	3,423		$	2,269		$	5,692		$	4,949		$	51		$	5,000
Taxable investment securities	(499		)	229			(270		)	(715		)	533			(182		)
Nontaxable investment securities	(479		)	(1,532		)	(2,011		)	(139		)	(86		)	(225		)
Fed Funds Sold	—			(5		)	(5		)	5			—			5
Other	261			64			325			34			35			69
Total changes in interest income	2,706			1,025			3,731			4,134			533			4,667
Changes in interest expense
Interest bearing demand deposits	18			17			35			9			60			69
Savings deposits	15			592			607			42			386			428
Time deposits	281			1,529			1,810			45			431			476
Borrowed funds	(132		)	817			685			536			120			656
Total changes in interest expense	182			2,955			3,137			632			997			1,629
Net change in interest margin (FTE)	$	2,524		$	(1,930	)	$	594		$	3,502		$	(464	)	$	3,038

Our net yield on interest earning assets remained unchanged during most of 2018, improving slightly in the fourth quarter. The continuing flattening of the yield curve and rising deposit rates combined with a high concentration of AFS securities as a percentage of earning assets has also placed pressure on net interest margin.

	Average Yield / Rate for the Three Month Periods Ended:
	December 31 2018		September 30 2018		June 30 2018		March 31 2018		December 31 2017
Total earning assets	4.01	%	3.94	%	3.84	%	3.77	%	3.86	%
Total interest bearing liabilities	1.23	%	1.20	%	1.08	%	0.99	%	1.01	%
Net yield on interest earning assets (FTE)	3.01	%	2.95	%	2.95	%	2.95	%	3.02	%

	Quarter to Date Net Interest Income (FTE)
	December 31 2018		September 30 2018		June 30 2018		March 31 2018		December 31 2017
Total interest income (FTE)	$	17,005	$	16,873	$	16,191	$	15,631	$	15,939
Total interest expense	4,258		4,231		3,741		3,401		3,435
Net interest income (FTE)	$	12,747	$	12,642	$	12,450	$	12,230	$	12,504

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Allowance for Loan and Lease Losses

The viability of any financial institution is ultimately determined by its management of credit risk. Loans represent our single largest concentration of risk. The ALLL is our estimation of incurred losses within the existing loan portfolio. We allocate the ALLL throughout the loan portfolio based on our assessment of the underlying risks associated with each loan segment. Our assessments include allocations based on specific impairment valuation allowances, historical charge-offs, internally assigned credit risk ratings, and past due and nonaccrual balances. A portion of the ALLL is not allocated to any one loan segment, but is instead a representation of other qualitative risks that reflect the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

The following table summarizes our charge-offs, recoveries, provision for loan losses, and ALLL balances as of, and for the unaudited three month periods ended:

	December 31 2018			September 30 2018			June 30 2018			March 31 2018			December 31 2017
Total charge-offs	$	253		$	179		$	566		$	103		$	401
Total recoveries	186			155			238			219			233
Net loan charge-offs (recoveries)	67			24			328			(116		)	168
Net loan charge-offs (recoveries) to average loans outstanding	0.01		%	—		%	0.03		%	(0.01		)%	0.02		%
Provision for loan losses	$	342		$	(76	)	$	328		$	384		$	168
Provision for loan losses to average loans outstanding	0.03		%	(0.01		)%	0.03		%	0.04		%	0.02		%
ALLL	$	8,375		$	8,100		$	8,200		$	8,200		$	7,700
ALLL as a % of loans at end of period	0.74		%	0.71		%	0.71		%	0.75		%	0.71		%

The following table summarizes our charge-off and recovery activity for the years ended December 31:

	2018			2017			2016			2015			2014
ALLL at beginning of period	$	7,700		$	7,400		$	7,400		$	10,100		$	11,500
Charge-offs
Commercial and agricultural	626			265			57			134			590
Residential real estate	151			200			574			397			722
Consumer	324			306			285			373			316
Total charge-offs	1,101			771			916			904			1,628
Recoveries
Commercial and agricultural	328			453			540			549			550
Residential real estate	261			206			287			220			197
Consumer	209			159			224			206			149
Total recoveries	798			818			1,051			975			896
Provision for loan losses	978			253			(135		)	(2,771		)	(668		)
ALLL at end of period	$	8,375		$	7,700		$	7,400		$	7,400		$	10,100
Net loan charge-offs (recoveries)	$	303		$	(47	)	$	(135	)	$	(71	)	$	732
Net loan charge-offs (recoveries) to average loans outstanding	0.03		%	—		%	(0.01		)%	(0.01		)%	0.09		%
ALLL as a% of loans at end of period	0.74		%	0.71		%	0.73		%	0.87		%	1.21		%

18

We experienced a higher level of charge-offs in 2018 when compared to 2017 which was significantly related to one borrower and is therefore, not indicative of a trend in charge-off activity. While we have experienced a slight deterioration in credit quality indicators in recent periods, credit quality remains strong. Overall, our level of required reserve is modest due to strong credit quality, low historical loss factors, and a low amount of net charge-offs. The following table illustrates our changes within the two main components of the ALLL as of:

	December 31 2018			September 30 2018			June 30 2018			March 31 2018			December 31 2017
ALLL
Individually evaluated for impairment	$	1,938		$	2,074		$	2,059		$	2,503		$	2,130
Collectively evaluated for impairment	6,437			6,026			6,141			5,697			5,570
Total	$	8,375		$	8,100		$	8,200		$	8,200		$	7,700
ALLL to gross loans
Individually evaluated for impairment	0.17		%	0.18		%	0.18		%	0.23		%	0.20		%
Collectively evaluated for impairment	0.57		%	0.53		%	0.53		%	0.52		%	0.51		%
Total	0.74		%	0.71		%	0.71		%	0.75		%	0.71		%

For further discussion of the allocation of the ALLL, see “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Loans Past Due and Loans in Nonaccrual Status

Fluctuations in past due and nonaccrual status loans can have a significant impact on the ALLL. To determine the potential impact and corresponding estimated losses, we analyze our historical loss trends on loans past due greater than 30 days and nonaccrual status loans. We monitor all loans that are past due and loans in nonaccrual status for indications of additional deterioration.

	Total Past Due and Nonaccrual Loans as of December 31
	2018			2017			2016			2015			2014
Commercial	$	2,722		$	2,518		$	3,347		$	1,015		$	4,496
Agricultural	5,377			2,367			1,251			1,232			309
Residential real estate	3,208			4,881			2,716			2,520			4,181
Consumer	105			70			115			31			138
Total	$	11,412		$	9,836		$	7,429		$	4,798		$	9,124
Total past due and nonaccrual loans to gross loans	1.01		%	0.90		%	0.74		%	0.56		%	1.09		%

Past due and nonaccrual status loans have increased over the last year but continue to be at low levels as a result of strong repayment performance. A summary of loans past due and in nonaccrual status, including the composition of the ending balance of nonaccrual status loans by type, is included in “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Troubled Debt Restructurings

We have taken a proactive approach to avoid foreclosures on borrowers who are willing to work with us in modifying their loans, thus making them more affordable. This approach has allowed certain borrowers to develop a payment structure that will allow them to continue making payments in lieu of foreclosure. The modifications have been successful for us and our customers as very few of the modified loans have resulted in foreclosures. At the time of the TDR, the loan is reviewed to determine whether or not to classify the loan as accrual or nonaccrual status. The majority of new modifications result in terms that satisfy our criteria for continued interest accrual. TDRs that have been placed in nonaccrual status may be placed back on accrual status after six months of continued performance and achievement of current payment status.

We restructure debt with borrowers who due to financial difficulties are unable to service their debt under the original terms. We may extend the amortization period, reduce interest rates, allow interest only payment structures, forgive principal, forgive interest, or grant a combination of these modifications. Typically, the modifications are for a period of three years or less. There were no TDRs that were government sponsored as of December 31, 2018 or December 31, 2017.

19

Losses associated with TDRs, if any, are included in the estimation of the ALLL during the quarter in which a loan is identified as a TDR, and we review the analysis of the ALLL estimation each reporting period thereafter to ensure its continued appropriateness.

The following table provides a roll-forward of TDRs for the years ended December 31, 2017 and 2018:

	Accruing Interest					Nonaccrual					Total
	Number of Loans		Balance			Number of Loans		Balance			Number of Loans		Balance
January 1, 2017	153		$	20,593		5		$	789		158		$	21,382
New modifications	20		7,128			8		1,138			28		8,266
Principal advances (payments)	—		(1,501		)	—		(127		)	—		(1,628		)
Loans paid off	(22	)	(1,500		)	—		—			(22	)	(1,500		)
Partial charge-offs	—		—			—		(170		)	—		(170		)
Balances charged-off	(2	)	(62		)	—		—			(2	)	(62		)
Transfers to OREO	—		—			(2	)	(91		)	(2	)	(91		)
Transfers to accrual status	2		126			(2	)	(126		)	—		—
Transfers to nonaccrual status	(4	)	(1,500		)	4		1,500			—		—
December 31, 2017	147		23,284			13		2,913			160		26,197
New modifications	27		6,623			18		1,733			45		8,356
Principal advances (payments)	—		(1,456		)	—		(714		)	—		(2,170		)
Loans paid off	(35	)	(4,361		)	(7	)	(819		)	(42	)	(5,180		)
Partial charge-offs	—		—			—		(39		)	—		(39		)
Balances charged-off	—		—			(1	)	(7		)	(1	)	(7		)
Transfers to OREO	—		—			(1	)	(206		)	(1	)	(206		)
Transfers to accrual status	1		520			(1	)	(520		)	—		—
Transfers to nonaccrual status	(7	)	(1,210		)	7		1,210			—		—
December 31, 2018	133		$	23,400		28		$	3,551		161		$	26,951

The following table summarizes our TDRs as of December 31:

	2018						2017						2016
	Accruing Interest		Nonaccrual		Total		Accruing Interest		Nonaccrual		Total		Accruing Interest		Nonaccrual		Total
Current	$	21,794	$	2,673	$	24,467	$	21,234	$	—	$	21,234	$	17,557	$	559	$	18,116
Past due 30-59 days	899		—		899		1,778		805		2,583		2,898		230		3,128
Past due 60-89 days	707		—		707		219		708		927		138		—		138
Past due 90 days or more	—		878		878		53		1,400		1,453		—		—		—
Total	$	23,400	$	3,551	$	26,951	$	23,284	$	2,913	$	26,197	$	20,593	$	789	$	21,382

	2015						2014
	Accruing Interest		Nonaccrual		Total		Accruing Interest		Nonaccrual		Total
Current	$	20,550	$	146	$	20,696	$	20,012	$	272	$	20,284
Past due 30-59 days	357		—		357		804		592		1,396
Past due 60-89 days	24		—		24		115		3		118
Past due 90 days or more	—		248		248		—		1,543		1,543
Total	$	20,931	$	394	$	21,325	$	20,931	$	2,410	$	23,341

Additional disclosures about TDRs are included in “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

20

Impaired Loans

The following is a summary of information pertaining to impaired loans as of December 31:

	2018						2017
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Recorded Balance		Unpaid Principal Balance		Valuation Allowance
TDRs
Commercial real estate	$	6,507	$	6,840	$	437	$	5,780	$	6,082	$	626
Commercial other	1,713		1,713		—		2,219		2,219		24
Agricultural real estate	7,452		7,452		112		7,913		7,913		—
Agricultural other	5,288		5,331		—		2,685		2,685		—
Residential real estate senior liens	5,923		6,205		1,181		7,460		7,839		1,406
Residential real estate junior liens	12		12		2		44		44		7
Home equity lines of credit	47		347		—		79		379		—
Consumer secured	9		9		—		17		17		—
Total TDRs	26,951		27,909		1,732		26,197		27,178		2,063
Other impaired loans
Commercial real estate	256		318		—		100		161		—
Commercial other	1,423		1,530		6		—		—		—
Agricultural real estate	557		558		—		—		—		—
Agricultural other	1,001		1,000		20		—		—		—
Residential real estate senior liens	911		1,084		180		356		620		67
Residential real estate junior liens	—		—		—		—		—		—
Home equity lines of credit	—		—		—		—		—		—
Consumer secured	—		—		—		—		—		—
Total other impaired loans	4,148		4,490		206		456		781		67
Total impaired loans	$	31,099	$	32,399	$	1,938	$	26,653	$	27,959	$	2,130

Additional disclosure related to impaired loans is included in “Note 4 – Loans and ALLL” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

21

Nonperforming Assets

The following table summarizes our nonperforming assets as of December 31:

	2018			2017			2016			2015			2014
Nonaccrual status loans	$	7,260		$	3,027		$	1,060		$	792		$	4,044
Accruing loans past due 90 days or more	113			395			633			—			148
Total nonperforming loans	7,373			3,422			1,693			792			4,192
Foreclosed assets	355			291			231			421			885
Total nonperforming assets	$	7,728		$	3,713		$	1,924		$	1,213		$	5,077
Nonperforming loans as a % of total loans	0.65		%	0.31		%	0.17		%	0.09		%	0.50		%
Nonperforming assets as a % of total assets	0.42		%	0.20		%	0.11		%	0.07		%	0.33		%

Typically after a loan is 90 days past due, it is placed in nonaccrual status unless it is well secured and in the process of short-term collection. Upon transferring a loan to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Loans may be placed back on accrual status after six months of continued performance and achievement of current payment status. While the level of nonperforming loans has increased in recent periods, it remains low in comparison to peer banks.

Included in the nonaccrual loan balances above were loans also classified as TDR as of December 31:

	2018		2017		2016		2015		2014
Commercial and agricultural	$	3,551	$	2,679	$	405	$	232	$	1,995
Residential real estate	—		234		384		162		262
Consumer	—		—		—		—		153
Total	$	3,551	$	2,913	$	789	$	394	$	2,410

Additional disclosures about nonaccrual status loans are included in “Note 4 – Loans and ALLL”of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

We continue to devote considerable attention to identifying impaired loans and adjusting the net carrying value of these loans to their current net realizable values through the establishment of a specific reserve or the recording of a charge-off. We have identified all impaired loans as of December 31, 2018.

The level of the ALLL is appropriate as of December 31, 2018. We closely monitor overall credit quality indicators and our policies and procedures related to the analysis of the ALLL to ensure that the ALLL remains at the appropriate level.

22

Noninterest Income and Noninterest Expenses

Significant noninterest income balances are highlighted in the following tables for the years ended December 31:

					Change							Change
	2018		2017		$			%		2016		$			%
Service charges and fees	$	6,210	$	6,013	$	197		3.28	%	$	5,230	$	783		14.97	%
Earnings on corporate owned life insurance policies	707		726		(19		)	(2.62	)%	761		(35		)	(4.60	)%
Net gain on sale of mortgage loans	525		647		(122		)	(18.86	)%	651		(4		)	(0.61	)%
Net gains on sale of AFS securities	—		142		(142		)	(100.00	)%	245		(103		)	(42.04	)%
Other
Investment and Trust advisory fees	2,836		2,607		229			8.78	%	2,705		(98		)	(3.62	)%
Corporate Settlement Solutions joint venture	274		164		110			67.07	%	415		(251		)	(60.48	)%
Gain on redemption of BOLI policies	—		—		—			—	%	469		(469		)	N/M
Other	394		513		(119		)	(23.20	)%	632		(119		)	(18.83	)%
Total other	3,504		3,284		220			6.70	%	4,221		(937		)	(22.20	)%
Total noninterest income	$	10,946	$	10,812	$	134		1.24	%	$	11,108	$	(296	)	(2.66	)%

Significant changes in noninterest income are detailed below:

• Service charges and fees include ATM and debit card fees, NSF and overdraft fees, loan servicing fee income, OMSR income and other deposit account fees. Fluctuations have primarily been attributed to changes in ATM and debit card fees and OMSR income. ATM and debit card fees fluctuate from period-to-period based primarily on usage of ATM and debit cards. We developed initiatives to increase ATM and debit card income in 2018 and expect that fees will continue to increase in 2019 as the usage of ATM and debit cards continues to increase. OMSR income results are driven, in part, by changes in offering rates on residential mortgage loans, anticipated prepayments in the servicing-retained portfolio, and the volume of loans within the servicing-retained portfolio. As such, OMSR income during 2019 could experience fluctuations and may not exceed 2018 OMSR income.

• Net gain on sale of mortgage loans fluctuates primarily as the result of a change in the amount of loans sold, and the amount of loans sold can fluctuate based on balance sheet management strategy.

• We are continually analyzing our AFS securities for potential sale opportunities. Securities with unrealized gains and less than desirable yields may be sold for funding and profitability purposes. During 2016 and 2017, we identified several agency securities that were desirable to be sold and recognized gains with these sales. We took this same approach in 2018 but did not identify sale opportunities. We anticipate taking this same approach in 2019.

• In recent periods, we have invested considerable efforts to increase our market share in Investment and Trust advisory services through marketing efforts and talent acquisition. We anticipate that these fees will increase in 2019 similar to the increase we experienced in 2018.

• Income from our interest in Corporate Settlement Solutions, a title insurance company, has increased as a result of national sales volume and strong operating expense controls. Income for 2019 is expected to exceed 2018 levels.

• In 2016, we recognized a $469 gain on the redemption of a bank owned life insurance policy and had no similar redemptions in 2017 and 2018.

• The fluctuations in all other income are spread throughout various categories, none of which are individually significant.

23

Significant noninterest expense balances are highlighted in the following table for the years ended December 31:

					Change							Change
	2018		2017		$			%		2016		$			%
Compensation and benefits	$	22,609	$	21,525	$	1,084		5.04	%	$	19,170	$	2,355		12.28	%
Furniture and equipment	6,182		5,523		659			11.93	%	5,275		248			4.70	%
Occupancy	3,263		3,133		130			4.15	%	3,227		(94		)	(2.91	)%
Other
Audit, consulting, and legal fees	2,263		2,043		220			10.77	%	1,952		91			4.66	%
ATM and debit card fees	1,036		1,181		(145		)	(12.28	)%	887		294			33.15	%
Loan underwriting fees	1,016		556		460			82.73	%	535		21			3.93	%
Director fees	858		856		2			0.23	%	851		5			0.59	%
FDIC insurance premiums	726		642		84			13.08	%	719		(77		)	(10.71	)%
Donations and community relations	710		657		53			8.07	%	582		75			12.89	%
Marketing costs	596		568		28			4.93	%	586		(18		)	(3.07	)%
OTTI on AFS securities	—		—		—			N/M		770		(770		)	(100.00	)%
All other	3,558		3,541		17			0.48	%	3,343		198			5.92	%
Total other	10,763		10,044		719			7.16	%	10,225		(181		)	(1.77	)%
Total noninterest expenses	$	42,817	$	40,225	$	2,592		6.44	%	$	37,897	$	2,328		6.14	%

Significant changes in noninterest expenses are detailed below:

• Compensation and benefits in 2017 and 2018 exceeded 2016 levels as a result of new positions required for growth within our markets, merit increases, increased service costs related to our defined benefit plan, and additional costs related to compliance requirements. In 2017, benefits expense was partially offset by a settlement with an insurance claim administrator in favor of Isabella Bank. Compensation and benefits expense in 2019 is expected to exceed 2018 levels as a result of merit increases.

• Furniture and equipment expense consists primarily of depreciation, services contracts and computer expenses. Computer expense increased in 2018 due to data and system upgrades, additional network security costs, and one-time implementation costs. Expenses in 2019 are expected to approximate 2018 levels.

• Audit, consulting, and legal fees increased in 2018 primarily as a result of one-time charges related to income tax strategies. As a result, fees are expected to approximate 2017 levels in 2019.

• We developed initiatives to increase ATM and debit card income in 2018 which resulted in increased ATM and debit card expenses. Expenses in 2017 included a one-time early termination fee with a card provider. ATM and debit card expenses are expected to approximate 2018 levels in 2019.

• Loan underwriting fees increased during 2018 as a result of new loan products, including first time home buyer and down payment assistance programs designed to generate residential mortgage growth. Expenses in 2019 are not expected to exceed 2018 levels.

• During the fourth quarter of 2016, we identified an AFS security that was impaired which resulted in an OTTI loss of $770. No such similar OTTI loss occurred in 2017 or 2018.

• The fluctuations in all other expenses are spread throughout various categories, none of which are individually significant.

24

Analysis of Changes in Financial Condition

The following table shows the composition and changes in our balance sheet as of December 31:

						Change
	2018			2017		$			%
ASSETS
Cash and cash equivalents	$	73,471		$	30,848	$	42,623		138.17	%
AFS securities
Amortized cost of AFS securities	501,245			547,912		(46,667		)	(8.52	)%
Unrealized gains (losses) on AFS securities	(6,411		)	818		(7,229		)	N/M
AFS securities	494,834			548,730		(53,896		)	(9.82	)%
Equity securities, at fair value	—			3,577		(3,577		)	(100.00	)%
Mortgage loans AFS	358			1,560		(1,202		)	(77.05	)%
Loans
Gross loans	1,128,707			1,091,519		37,188			3.41	%
Less allowance for loan and lease losses	8,375			7,700		675			8.77	%
Net loans	1,120,332			1,083,819		36,513			3.37	%
Premises and equipment	27,815			28,450		(635		)	(2.23	)%
Corporate owned life insurance policies	27,733			27,026		707			2.62	%
Accrued interest receivable	6,928			7,063		(135		)	(1.91	)%
Equity securities without readily determinable fair values	24,948			23,454		1,494			6.37	%
Goodwill and other intangible assets	48,451			48,547		(96		)	(0.20	)%
Other assets	12,437			10,056		2,381			23.68	%
TOTAL ASSETS	$	1,837,307		$	1,813,130	$	24,177		1.33	%
LIABILITIES AND SHAREHOLDERS’ EQUITY
Liabilities
Deposits	$	1,292,693		$	1,265,258	$	27,435		2.17	%
Borrowed funds	340,299			344,878		(4,579		)	(1.33	)%
Accrued interest payable and other liabilities	8,796			8,089		707			8.74	%
Total liabilities	1,641,788			1,618,225		23,563			1.46	%
Shareholders’ equity	195,519			194,905		614			0.32	%
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	1,837,307		$	1,813,130	$	24,177		1.33	%

As shown above, total assets increased $24,177 during 2018 which was primarily driven by loan growth of $37,188. This growth was funded through maturities and the receipt of principal payments in AFS securities as well as growth in deposits. While generating quality loans will continue to be challenging as a result of competition, loan growth is expected in 2019.

A discussion of changes in balance sheet amounts by major categories follows:

Cash and cash equivalents

Included in cash and cash equivalents are funds held with the FRB which fluctuate from period-to-period. Cash levels were elevated at December 31, 2018 as excess liquidity is expected to be used to pay off maturing long-term borrowings and other short-term liabilities during the first quarter of 2019.

AFS securities

The primary objective of our investing activities is to provide for safety of the principal invested. Secondary considerations include the need for earnings, liquidity, and our overall exposure to changes in interest rates. The current flat yield curve encourages using excess liquidity to reduce high-cost borrowings and therefore, AFS securities balances are not expected to rise significantly in the near term.

25

The following is a schedule of the carrying value of AFS investment securities as of December 31:

	2018		2017		2016		2015		2014
Government sponsored enterprises	$	170	$	216	$	10,259	$	24,345	$	24,136
States and political subdivisions	190,866		208,474		212,919		232,217		215,345
Auction rate money market preferred	2,554		3,049		2,794		2,866		2,619
Mortgage-backed securities	184,484		208,797		227,256		263,384		166,926
Collateralized mortgage obligations	116,760		128,194		101,443		134,025		152,368
Total	$	494,834	$	548,730	$	554,671	$	656,837	$	561,394

Excluding those holdings in government sponsored enterprises and municipalities within the State of Michigan, there were no investments in securities of any one issuer that exceeded 10% of shareholders’ equity. We have a policy prohibiting investments in securities that we deem unsuitable due to their inherent credit or market risks. Prohibited investments include stripped mortgage-backed securities, zero coupon bonds, nongovernment agency asset-backed securities, and structured notes. Our holdings in mortgage-backed securities and collateralized mortgage obligations include only government agencies and government sponsored agencies as we hold no investments in private label mortgage-backed securities or collateralized mortgage obligations.

The following is a schedule of maturities of AFS investment securities and their weighted average yields as of December 31, 2018. Weighted average yields have been computed on an FTE basis using a tax rate of 21%. Our auction rate money market preferred investments are long-term floating rate instruments. The issuers of auction rate securities generally have the right to redeem or refinance the debt. Because of their lack of contractual maturities, auction rate money market preferred stocks are not reported by a specific maturity group. Mortgage-backed securities and collateralized mortgage obligations are not reported by a specific maturity group due to their variable monthly payments. Expected maturities may differ from contractual maturities because issuers may have the right to call or prepay obligations.

	Maturing
	Within One Year			After One Year But Within Five Years			After Five Years But Within Ten Years			After Ten Years			Securities with Variable  Monthly Payments or Noncontractual Maturities
	Amount		Yield (%)	Amount		Yield (%)	Amount		Yield (%)	Amount		Yield (%)	Amount		Yield (%)
Government sponsored enterprises	$	—	—	$	170	2.06	$	—	—	$	—	—	$	—	—
States and political subdivisions	23,189		2.96	82,492		3.46	56,842		3.61	28,343		4.04	—		—
Mortgage-backed securities	—		—	—		—	—		—	—		—	184,484		2.36
Collateralized mortgage obligations	—		—	—		—	—		—	—		—	116,760		2.44
Auction rate money market preferred	—		—	—		—	—		—	—		—	2,554		6.20
Total	$	23,189	2.96	$	82,662	3.46	$	56,842	3.61	$	28,343	4.04	$	303,798	2.42

Loans

Loans are the largest component of earning assets. The proper management of credit and market risk inherent in the loan portfolio is critical to our financial well-being. To control these risks, we have adopted strict underwriting standards which include lending limits to a single borrower, loan to collateral value limits, and a defined market area. We also monitor and limit loan concentrations to specific industries. We have no foreign loans and there were no concentrations greater than 10% of total loans that are not disclosed as a separate category in the following table.

26

The following table presents the composition of the loan portfolio for the years ended December 31:

	2018		2017		2016		2015		2014
Commercial	$	659,529	$	634,759	$	575,664	$	448,381	$	433,270
Agricultural	127,161		128,269		126,492		115,911		104,721
Residential real estate	275,343		272,368		266,050		251,501		266,155
Consumer	66,674		56,123		42,409		34,699		32,404
Total	$	1,128,707	$	1,091,519	$	1,010,615	$	850,492	$	836,550

The following table presents the change in the loan portfolio categories for the years ended December 31:

	2018					2017				2016
	$ Change			% Change		$ Change		% Change		$ Change		% Change
Commercial	$	24,770		3.90	%	$	59,095	10.27	%	$	127,283	28.39	%
Agricultural	(1,108		)	(0.86	)%	1,777		1.40	%	10,581		9.13	%
Residential real estate	2,975			1.09	%	6,318		2.37	%	14,549		5.78	%
Consumer	10,551			18.80	%	13,714		32.34	%	7,710		22.22	%
Total	$	37,188		3.41	%	$	80,904	8.01	%	$	160,123	18.83	%

While competition for commercial loans continues to be strong, we experienced significant growth in this segment of the portfolio during 2016 and 2017 and had modest growth in 2018. Growth in 2019 is expected to be consistent with growth during 2018. Despite a decline in agricultural loans, we expect modest change in the agricultural portfolio in 2019. Residential real estate and consumer loans also experienced growth over the last year and are both expected to increase in 2019.

Equity securities without readily determinable fair values

Included in equity securities without readily determinable fair values are restricted securities, which are carried at cost, and investments in unconsolidated entities accounted for under the equity method of accounting (see “Note 1 – Nature of Operations and Summary of Significant Accounting Policies” and “Note 17 – Fair Value” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data).

Other assets

Other assets consist primarily of prepaid expenses, OMSR, and net deferred tax assets. For more information related to estimates and deferred taxes, refer to “Note 1 – Nature of Operations and Summary of Significant Accounting Policies” and “Note 15 – Federal Income Taxes” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Deposits

Deposits are our primary source of funding. The following table presents the composition of the deposit portfolio as of December 31:

	2018		2017		2016		2015		2014
Noninterest bearing demand deposits	$	236,534	$	237,511	$	205,071	$	191,376	$	181,826
Interest bearing demand deposits	235,287		231,666		209,325		212,666		190,984
Savings deposits	387,252		342,815		347,230		337,641		261,412
Certificates of deposit	348,046		331,718		321,914		324,101		339,824
Brokered certificates of deposit	72,229		102,808		88,632		73,815		72,134
Internet certificates of deposit	13,345		18,740		22,868		24,964		28,304
Total	$	1,292,693	$	1,265,258	$	1,195,040	$	1,164,563	$	1,074,484

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The following table presents the change in the deposit categories for the years ended December 31:

	2018					2017					2016
	$ Change			% Change		$ Change			% Change		$ Change			% Change
Noninterest bearing demand deposits	$	(977	)	(0.41	)%	$	32,440		15.82	%	$	13,695		7.16	%
Interest bearing demand deposits	3,621			1.56	%	22,341			10.67	%	(3,341		)	(1.57	)%
Savings deposits	44,437			12.96	%	(4,415		)	(1.27	)%	9,589			2.84	%
Certificates of deposit	16,328			4.92	%	9,804			3.05	%	(2,187		)	(0.67	)%
Brokered certificates of deposit	(30,579		)	(29.74	)%	14,176			15.99	%	14,817			20.07	%
Internet certificates of deposit	(5,395		)	(28.79	)%	(4,128		)	(18.05	)%	(2,096		)	(8.40	)%
Total	$	27,435		2.17	%	$	70,218		5.88	%	$	30,477		2.62	%

Deposit demand continues to be driven by non-contractual deposits, such as demand and savings deposits. We've also experienced growth in certificates of deposit in the past two years. Brokered certificates of deposit offer another source of funding and fluctuate from period-to-period based on our funding needs, including changes in assets such as loans and investments.

The remaining maturity of certificates of deposit of $250 or more as of December 31, 2018 was as follows:

Maturity
Within 3 months	$	24,668
Within 3 to 6 months	6,088
Within 6 to 12 months	17,679
Over 12 months	27,493
Total	$	75,928

Borrowed Funds

Borrowed funds include FHLB advances, securities sold under agreements to repurchase, and federal funds purchased. The balance of borrowed funds fluctuates from period-to-period based on our funding needs that arise from changes in loans, investments, and deposits. To provide balance sheet growth, we utilize borrowings and brokered deposits to fund earning assets.

The following table presents borrowed funds balances for the years ended December 31:

	2018		2017		2016		2015		2014
FHLB advances	$	300,000	$	290,000	$	270,000	$	235,000	$	192,000
Securities sold under agreements to repurchase without stated maturity dates	40,299		54,878		60,894		70,532		95,070
Securities sold under agreements to repurchase with stated maturity dates	—		—		—		—		439
Federal funds purchased	—		—		6,800		4,200		2,200
Total	$	340,299	$	344,878	$	337,694	$	309,732	$	289,709

For additional disclosure related to borrowed funds, see “Note 8 – Borrowed Funds” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Accrued interest payable and other liabilities

Included in accrued interest payable and other liabilities are obligations related to our defined benefit pension plan and other employee benefits. For more information on the defined benefit pension plan and other employee benefits, see “Note 12 – Benefit Plans” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

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Contractual Obligations and Loan Commitments

We have various financial obligations, including contractual obligations and commitments, which may require future cash payments. The following schedule summarizes our non-cancellable obligations and future minimum payments as of December 31, 2018:

	Minimum Payments Due by Period
	Due in One Year or Less		After One Year But Within Three Years		After Three Years But Within Five Years		After Five Years		Total
Deposits
Deposits with no stated maturity	$	859,073	$	—	$	—	$	—	$	859,073
Certificates of deposit with stated maturities	232,349		121,087		73,216		6,968		433,620
Total deposits	1,091,422		121,087		73,216		6,968		1,292,693
Borrowed funds
Short-term borrowings	40,299		—		—		—		40,299
Long-term borrowings	100,000		115,000		55,000		30,000		300,000
Total borrowed funds	140,299		115,000		55,000		30,000		340,299
Total contractual obligations	$	1,231,721	$	236,087	$	128,216	$	36,968	$	1,632,992

We also have loan commitments that may impact liquidity. The following schedule summarizes our loan commitments and expiration dates by period as of December 31, 2018. Commitments to grant loans include residential mortgage loans with the majority committed to be sold to the secondary market. Since many of these commitments historically have expired without being drawn upon, the total amount of these commitments does not necessarily represent our future cash requirements.

	Expiration Dates by Period
	Due in One Year or Less		After One Year But Within Three Years		After Three Years But Within Five Years		After Five Years		Total
Unused commitments under lines of credit	$	95,540	$	70,701	$	24,362	$	9,049	$	199,652
Commercial and standby letters of credit	1,723		—		—		—		1,723
Commitments to grant loans	13,225		—		—		—		13,225
Total loan commitments	$	110,488	$	70,701	$	24,362	$	9,049	$	214,600

For additional disclosure related to Contractual Obligations and Loan Commitments, see “Note 9 – Off-Balance-Sheet Activities, Commitments and Other Matters” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

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Capital

Capital consists of common stock, retained earnings, and accumulated other comprehensive income (loss). We are authorized to raise capital through dividend reinvestment, employee stock purchases, and shareholder stock purchases. Pursuant to these authorizations, we issued 261,693 shares or $6,864 of common stock during 2018, and 220,510 shares or $6,177 of common stock in 2017. We also offer the Directors Plan in which participants purchase stock units through deferred fees, in lieu of cash payments. Pursuant to this plan, we increased shareholders’ equity by $612 and $640 during 2018 and 2017, respectively.

We have a publicly announced common stock repurchase plan. Pursuant to this plan, we repurchased 248,017 shares or $7,007 of common stock during 2018 and 184,286 shares or $5,181 during 2017. As of December 31, 2018, we were authorized to repurchase up to an additional 167,654 shares of common stock.

The FRB has established minimum risk-based capital guidelines. Pursuant to these guidelines, a framework has been established that assigns risk weights to each category of on and off-balance-sheet items to arrive at risk adjusted total assets. Regulatory capital is divided by the risk adjusted assets with the resulting ratio compared to the minimum standard to determine whether a corporation has adequate capital. On July 2, 2013, the FRB published revised BASEL III Capital standards for banks. The final rules redefine what is included or deducted from equity capital, changes risk weighting for certain on and off-balance sheet assets, increases the minimum required equity capital to be considered well capitalized, and introduces a capital conservation buffer. The rules, which are being gradually phased in between 2015 and 2019, are not expected to have a material impact on the Corporation but will require us to hold more capital than we have historically.

There are no significant regulatory constraints placed on our capital. The FRB’s current minimum primary capital to adjusted assets ratio requirement is 6.00%. Our primary capital to adjusted average assets, or tier 1 leverage ratio, was 8.72% as of December 31, 2018.

Effective January 1, 2015, the minimum standard for primary, or Tier 1, capital increased from 4.00% to 6.00%. The minimum standard for total capital is 8.00%. Also effective January 1, 2015 was the new common equity tier 1 capital ratio which had a minimum requirement of 4.50%. Beginning on January 1, 2016, the capital conservation buffer went into effect which further increased the required levels. The following table sets forth the percentages required under the Risk Based Capital guidelines and our ratios as of December 31:

	2018				2017
	Actual		Minimum Required		Actual		Minimum Required
Common equity tier 1 capital	12.58	%	6.375	%	12.23	%	5.750	%
Tier 1 capital	12.58	%	7.875	%	12.23	%	7.250	%
Total Capital	13.26	%	9.875	%	12.86	%	9.250	%

At December 31, 2018, the Bank exceeded minimum capital requirements. For further information regarding the Bank’s capital requirements, see “Note 10 – Minimum Regulatory Capital Requirements” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

Fair Value

We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. AFS securities and certain liabilities are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record at fair value other assets on a nonrecurring basis, such as mortgage loans AFS, impaired loans, goodwill, foreclosed assets, OMSR, and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write downs of individual assets.

For further information regarding fair value measurements, see “Note 1 – Nature of Operations and Summary of Significant Accounting Policies” and “Note 17 – Fair Value” of “Notes to Consolidated Financial Statements” in Item 8. Financial Statements and Supplementary Data.

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Liquidity

Liquidity is monitored regularly by our Market Risk Committee, which consists of members of senior management. The committee reviews projected cash flows, key ratios, and liquidity available from both primary and secondary sources.

Our primary sources of liquidity are cash and cash equivalents and unencumbered AFS securities. These categories totaled $256,583 or 13.97% of assets as of December 31, 2018 as compared to $296,765 or 16.37% as of December 31, 2017. The decrease in primary liquidity is a direct result of our unencumbered AFS securities' maturity and principal payment activity during 2018. Liquidity is important for financial institutions because of their need to meet loan funding commitments, depositor withdrawal requests, and various other commitments including expansion of operations, investment opportunities, and payment of cash dividends. Liquidity could vary significantly daily, based on customer activity.

Our primary source of funds is deposit accounts. Our secondary sources include the ability to borrow from the FHLB, from the FRB, and through various correspondent banks in the form of federal funds purchased and a line of credit. These funding methods typically carry a higher interest rate than traditional market deposit accounts. Some borrowed funds, including FHLB advances, FRB Discount Window advances, and repurchase agreements, require us to pledge assets, typically in the form of AFS securities or loans as collateral. As of December 31, 2018, we had available lines of credit of $150,162.

The following table summarizes our sources and uses of cash for the years ended December 31:

	2018		2017			$ Variance
Net cash provided by (used in) operating activities	$	22,010	$	19,721		$	2,289
Net cash provided by (used in) investing activities	6,470		(81,755		)	88,225
Net cash provided by (used in) financing activities	14,143		69,988			(55,845		)
Increase (decrease) in cash and cash equivalents	42,623		7,954			34,669
Cash and cash equivalents January 1	30,848		22,894			7,954
Cash and cash equivalents December 31	$	73,471	$	30,848		$	42,623

Market Risk

Our primary market risks are interest rate risk and liquidity risk. IRR is the exposure of our net interest income to changes in interest rates. IRR results from the difference in the maturity or repricing frequency of a financial institution's interest earning assets and its interest bearing liabilities. IRR is the fundamental method by which financial institutions earn income and create shareholder value. Excessive exposure to IRR could pose a significant risk to our earnings and capital.

The FRB has adopted a policy requiring us to effectively manage the various risks that can have a material impact on our safety and soundness. The risks include credit, interest rate, liquidity, operational, and reputational. We have policies, procedures, and internal controls for measuring and managing these risks. Specifically, our Funds Management policy and procedures include defining acceptable types and terms of investments and funding sources, liquidity requirements, limits on investments in long-term assets, limiting the mismatch in repricing opportunity of assets and liabilities, and the frequency of measuring and reporting to our Board.

The primary technique to measure IRR is simulation analysis. Simulation analysis forecasts the effects on the balance sheet structure and net interest income under a variety of scenarios that incorporate changes in interest rates, the shape of yield curves, interest rate relationships, loan prepayments, and funding sources. These forecasts are compared against net interest income projected in a stable interest rate environment. While many assets and liabilities reprice either at maturity or in accordance with their contractual terms, several balance sheet components demonstrate characteristics that require an evaluation to more accurately reflect their repricing behavior. Key assumptions in the simulation analysis include prepayments on loans, probable calls of investment securities, changes in market conditions, loan volumes and loan pricing, deposit sensitivity, and customer preferences. These assumptions are inherently uncertain as they are subject to fluctuation and revision in a dynamic environment. As a result, the simulation analysis cannot precisely forecast the impact of rising and falling interest rates on net interest income. Actual results will differ from simulated results due to many other factors, including changes in balance sheet components, interest rate changes, changes in market conditions, and management strategies.

Our interest rate sensitivity is estimated by first forecasting the next 12 and 24 months of net interest income under an assumed environment of a constant balance sheet and constant market interest rates (base case). We then compare the results of various simulation analyses to the base case. At December 31, 2018, we projected the change in net interest income during the next 12 and 24 months assuming market interest rates were to immediately decrease by 100 and 200 basis points and increase by 100, 200, 300, and 400 basis points in a parallel fashion over the entire yield curve during the same time period. These projections

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were based on our assets and liabilities remaining static over the next 12 and 24 months, while factoring in probable calls and prepayments of certain investment securities and residential real estate and consumer loans. While it is extremely unlikely that interest rates would immediately change to these levels, we feel that these extreme scenarios help us identify potential gaps and mismatches in the repricing characteristics of assets and liabilities. We regularly monitor our projected net interest income sensitivity to ensure that it remains within established limits. As of December 31, 2018, our interest rate sensitivity results were within Board approved limits.

The following tables summarize our interest rate sensitivity for 12 and 24 months as of:

	December 31, 2018
	12 Months
Immediate basis point change assumption (short-term)	-200		-100		+100		+200		+300		+400
Percent change in net interest income vs. constant rates	(4.90	)%	(2.85	)%	1.06	%	2.67	%	5.15	%	6.22	%
	24 Months
Immediate basis point change assumption (short-term)	-200		-100		+100		+200		+300		+400
Percent change in net interest income vs. constant rates	(6.76	)%	(4.04	)%	1.83	%	3.82	%	6.53	%	6.54	%

	December 31, 2017
	12 Months
Immediate basis point change assumption (short-term)	-200		-100		+100		+200		+300		+400
Percent change in net interest income vs. constant rates	(5.57	)%	(2.43	)%	2.36	%	4.18	%	5.99	%	7.94	%
	24 Months
Immediate basis point change assumption (short-term)	-200		-100		+100		+200		+300		+400
Percent change in net interest income vs. constant rates	(5.10	)%	(2.29	)%	2.61	%	4.17	%	5.39	%	6.09	%

Gap analysis, the secondary method to measure IRR, measures the cash flows and/or the earliest repricing of our interest bearing assets and liabilities. This analysis is useful for measuring trends in the repricing characteristics of the balance sheet. Significant assumptions are required in this process because of the embedded repricing options contained in assets and liabilities. Residential real estate and consumer loans allow the borrower to repay the balance prior to maturity without penalty, while commercial and agricultural loans may have prepayment penalties. The amount of prepayments is dependent upon many factors, including the interest rate of a given loan in comparison to the current offering rates, the level of sales of used homes, and the overall availability of credit in the market place. Generally, a decrease in interest rates will result in an increase in cash flows from these assets. A significant portion of our securities are callable or have prepayment options. The call and prepayment options are more likely to be exercised in a period of decreasing interest rates. Savings and demand accounts may generally be withdrawn on request without prior notice. The timing of cash flows from these deposits is estimated based on historical experience. Certificates of deposit have penalties that discourage early withdrawals.

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The following tables provide information about assets and liabilities that are sensitive to changes in interest rates as of December 31, 2018 and December 31, 2017. The principal amounts of investments, loans, other interest earning assets, borrowings, and time deposits maturing were calculated based on the contractual maturity dates. Estimated cash flows for savings and NOW accounts are based on our estimated deposit decay rates.

	December 31, 2018
	2019			2020			2021			2022			2023			Thereafter			Total			Fair Value
Rate sensitive assets
Other interest bearing assets	$	49,837		$	100		$	—		$	—		$	—		$	—		$	49,937		$	49,937
Average interest rates	1.85		%	1.72		%	—		%	—		%	—		%	—		%	1.85		%
AFS securities	$	84,691		$	77,165		$	70,081		$	70,033		$	59,541		$	133,323		$	494,834		$	494,834
Average interest rates	2.49		%	2.62		%	2.60		%	2.43		%	2.52		%	2.75		%	2.59		%
Equity securities	$	—		$	—		$	—		$	—		$	—		$	—		$	—		$	—
Average interest rates	$	—		$	—		$	—		$	—		$	—		$	—		$	—
Fixed interest rate loans (1)	$	152,336		$	118,585		$	142,107		$	113,587		$	119,069		$	188,082		$	833,766		$	792,394
Average interest rates	4.44		%	4.37		%	4.34		%	4.46		%	4.49		%	4.23		%	4.38		%
Variable interest rate loans (1)	$	70,336		$	30,855		$	42,968		$	22,766		$	18,685		$	109,331		$	294,941		$	287,196
Average interest rates	6.14		%	5.75		%	5.76		%	5.22		%	5.01		%	4.16		%	5.16		%
Rate sensitive liabilities
Fixed rate borrowed funds	$	140,299		$	55,000		$	50,000		$	20,000		$	35,000		$	30,000		$	330,299		$	323,903
Average interest rates	1.41		%	2.18		%	1.91		%	1.97		%	3.17		%	2.36		%	1.92		%
Variable rate borrowed funds	$	—		$	—		$	10,000		$	—		$	—		$	—		$	10,000		$	9,926
Average interest rates	—		%	—		%	2.62		%	—		%	—		%	—		%	2.62		%
Savings and NOW accounts	$	55,248		$	49,944		$	44,783		$	40,191		$	36,105		$	396,268		$	622,539		$	622,539
Average interest rates	0.52		%	0.51		%	0.50		%	0.50		%	0.49		%	0.44		%	0.46		%
Fixed interest rate certificates of deposit	$	227,451		$	54,051		$	65,036		$	41,502		$	31,714		$	6,968		$	426,722		$	419,116
Average interest rates	1.63		%	1.90		%	2.09		%	1.99		%	2.23		%	2.14		%	1.82		%
Variable interest rate certificates of deposit	$	4,898		$	2,000		$	—		$	—		$	—		$	—		$	6,898		$	6,877
Average interest rates	2.32		%	2.61		%	—		%	—		%	—		%	—		%	2.40		%

	December 31, 2017
	2018			2019			2020			2021			2022			Thereafter			Total			Fair Value
Rate sensitive assets
Other interest bearing assets	$	5,481		$	—		$	100		$	—		$	—		$	—		$	5,581		$	5,581
Average interest rates	1.65		%	—		%	0.35		%	—		%	—		%	—		%	1.63		%
AFS securities	$	95,000		$	72,551		$	71,591		$	68,127		$	60,607		$	180,854		$	548,730		$	548,730
Average interest rates	2.33		%	2.46		%	2.59		%	2.58		%	2.38		%	2.56		%	2.49		%
Equity securities	$	—		$	—		$	—		$	—		$	—		$	3,577		$	3,577		$	3,577
Average interest rates	—		%	—		%	—		%	—		%	—		%	4.00		%	4.00		%
Fixed interest rate loans (1)	$	153,100		$	118,068		$	114,872		$	129,992		$	116,779		$	222,971		$	855,782		$	825,855
Average interest rates	4.12		%	4.34		%	4.24		%	4.16		%	4.34		%	4.01		%	4.17		%
Variable interest rate loans (1)	$	70,738		$	35,473		$	27,164		$	25,494		$	20,158		$	56,710		$	235,737		$	231,051
Average interest rates	5.48		%	4.79		%	4.91		%	4.43		%	4.39		%	3.72		%	4.68		%
Rate sensitive liabilities
Fixed rate borrowed funds	$	124,878		$	85,000		$	35,000		$	50,000		$	20,000		$	20,000		$	334,878		$	332,146
Average interest rates	1.15		%	1.87		%	1.80		%	1.91		%	1.97		%	2.54		%	1.65		%
Variable rate borrowed funds	$	—		$	—		$	—		$	10,000		$	—		$	—		$	10,000		$	9,943
Average interest rates	—		%	—		%	—		%	1.72		%	—		%	—		%	1.72		%
Savings and NOW accounts	$	49,140		$	44,096		$	39,607		$	35,611		$	32,051		$	373,976		$	574,481		$	574,481
Average interest rates	0.22		%	0.22		%	0.22		%	0.22		%	0.21		%	0.27		%	0.25		%
Fixed interest rate certificates of deposit	$	188,598		$	109,047		$	37,604		$	50,814		$	38,843		$	21,840		$	446,746		$	437,400
Average interest rates	1.05		%	1.57		%	1.62		%	1.76		%	1.85		%	2.05		%	1.42		%
Variable interest rate certificates of deposit	$	2,414		$	4,106		$	—		$	—		$	—		$	—		$	6,520		$	6,492
Average interest rates	1.40		%	1.66		%	—		%	—		%	—		%	—		%	1.56		%

⁽¹⁾ The fair value reported is exclusive of the allocation of the ALLL.

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We do not believe there has been a material change in the nature or categories of our primary market risk exposure, or the particular markets that present the primary risk of loss. We do not know of or expect there to be any material change in the general nature of our primary market risk exposure in the near term. We do not expect to make material changes to our market risk methods in the near term. We may change those methods in the future to adapt to changes in circumstances or to implement new techniques.

Interest Rate Sensitivity

Interest rate sensitivity is determined by the amount of earning assets and interest bearing liabilities repricing within a specific time period, and their relative sensitivity to a change in interest rates. We strive to achieve reasonable stability in the net interest margin through periods of changing interest rates. One tool we use to measure interest rate sensitivity is gap analysis. As shown in the following table, the gap analysis depicts our position for specific time periods and the cumulative repricing gap as a percentage of total assets.

The interest rate sensitivity information for AFS securities is based on the expected prepayments and call dates versus stated maturities. Fixed rate loans are included in the appropriate time frame based on their scheduled amortization. Variable rate loans, which totaled $294,941 as of December 31, 2018, are included in the time frame of their earliest repricing. Time deposit liabilities are scheduled based on their contractual maturity except for variable rate time deposits in the amount of $6,898 that are included in the 0 to 3 month time frame.

The following table shows the time periods and the amount of assets and liabilities available for interest rate repricing as of December 31, 2018. For purposes of this analysis, nonaccrual loans and the ALLL are excluded.

	0 to 3 Months			4 to 12 Months			1 to 5 Years			Over 5 Years
Interest sensitive assets
AFS securities	$	16,844		$	67,847		$	276,820		$	133,323
Loans	342,087			97,930			493,348			188,082
Total	$	358,931		$	165,777		$	770,168		$	321,405
Interest sensitive liabilities
Borrowed funds	$	95,299		$	45,000		$	170,000		$	30,000
Time deposits	85,979			148,370			192,303			6,968
Savings	387,252			—			—			—
NOW	235,287			—			—			—
Total	$	803,817		$	193,370		$	362,303		$	36,968
Cumulative repricing gap	$	(444,886	)	$	(472,479	)	$	(64,614	)	$	219,823
Cumulative repricing gap as a % of assets	(24.21		)%	(25.72		)%	(3.52		)%	11.96		%

The following table shows the maturity of commercial and agricultural loans outstanding at December 31, 2018. Also provided are the amounts due after one year, classified according to the sensitivity to changes in interest rates.

	1 Year or Less		1 to 5 Years		Over 5 Years		Total
Commercial and agricultural	$	117,472	$	447,279	$	221,939	$	786,690
Interest sensitivity
Loans maturing after one year that have:
Fixed interest rates			$	381,791	$	186,836
Variable interest rates			65,488		35,103
Total			$	447,279	$	221,939

34

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

The information presented in the section captioned “Market Risk” in Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations is incorporated herein by reference.

Item 8. Financial Statements and Supplementary Data.

The following consolidated financial statements accompanied by the report of our independent registered public accounting firm are set forth beginning on the following page of this report:

Report of Independent Registered Public Accounting Firm

Consolidated Balance Sheets

Consolidated Statements of Changes in Shareholders’ Equity

Consolidated Statements of Income

Consolidated Statements of Comprehensive Income (Loss)

Consolidated Statements of Cash Flows

Notes to Consolidated Financial Statements

Supplementary data regarding quarterly results of operations is included in Item 6. Selected Financial Data.

35

Report of Independent Registered Public Accounting Firm

Shareholders and Board of Directors

Isabella Bank Corporation

Mount Pleasant, Michigan

Opinion on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Isabella Bank Corporation as of December 31, 2018 and 2017, and the related consolidated statements of changes in shareholders’ equity, income, comprehensive income, and cash flows for each of the years in the three-year period ended December 31, 2018, and the related notes (collectively referred to as the financial statements). We also have audited Isabella Bank Corporation’s internal control over financial reporting as of December 31, 2018, based on criteria established in the Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria).

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the consolidated financial position of Isabella Bank Corporation as of December 31, 2018 and 2017, and the consolidated results of their operations and their cash flows for each of the years in the three-year period ended December 31, 2018, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion Isabella Bank Corporation maintained, in all material respects, effective internal control over financial reporting as of December 31, 2018, based on the COSO criteria.

Basis for Opinions

Isabella Bank Corporation’s management is responsible for these consolidated financial statements, for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management’s Report on Internal Control over Financial Reporting. Our responsibility is to express opinions on Isabella Bank Corporation’s consolidated financial statements and on Isabella Bank Corporation’s internal control over financial reporting based on our integrated audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to Isabella Bank Corporation in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in all material respects.

Our audits of the consolidated financial statements included performing procedures to assess the risks of material misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the consolidated financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material misstatement exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. We believe that our audits provide a reasonable basis for our opinions.

Definition and Limitations of Internal Control over Financial Reporting

A corporation’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles. A corporation’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the corporation; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of consolidated financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the corporation are being made only in accordance with authorizations of management and directors of the corporation; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the corporation’s assets that could have a material effect on the consolidated financial statements.

36

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/Rehmann Robson LLC

We have served as Isabella Bank Corporation's independent auditor since 1996.

Saginaw, Michigan

March 13, 2019

37

CONSOLIDATED BALANCE SHEETS

(Dollars in thousands)

	December 31
	2018			2017
ASSETS
Cash and cash equivalents
Cash and demand deposits due from banks	$	23,534		$	25,267
Interest bearing balances due from banks	49,937			5,581
Total cash and cash equivalents	73,471			30,848
AFS securities, at fair value	494,834			548,730
Equity securities, at fair value	—			3,577
Mortgage loans AFS	358			1,560
Loans
Commercial	659,529			634,759
Agricultural	127,161			128,269
Residential real estate	275,343			272,368
Consumer	66,674			56,123
Gross loans	1,128,707			1,091,519
Less allowance for loan and lease losses	8,375			7,700
Net loans	1,120,332			1,083,819
Premises and equipment	27,815			28,450
Corporate owned life insurance policies	27,733			27,026
Accrued interest receivable	6,928			7,063
Equity securities without readily determinable fair values	24,948			23,454
Goodwill and other intangible assets	48,451			48,547
Other assets	12,437			10,056
TOTAL ASSETS	$	1,837,307		$	1,813,130
LIABILITIES AND SHAREHOLDERS’ EQUITY
Deposits
Noninterest bearing	$	236,534		$	237,511
NOW accounts	235,287			231,666
Certificates of deposit under $250 and other savings	744,944			728,090
Certificates of deposit over $250	75,928			67,991
Total deposits	1,292,693			1,265,258
Borrowed funds	340,299			344,878
Accrued interest payable and other liabilities	8,796			8,089
Total liabilities	1,641,788			1,618,225
Shareholders’ equity
Common stock — no par value 15,000,000 shares authorized; issued and outstanding 7,870,969 shares (including 16,673 shares held in the Rabbi Trust) in 2018 and 7,857,293 shares (including 31,769 shares held in the Rabbi Trust) in 2017	140,416			140,277
Shares to be issued for deferred compensation obligations	5,431			5,502
Retained earnings	57,357			51,728
Accumulated other comprehensive income (loss)	(7,685		)	(2,602		)
Total shareholders’ equity	195,519			194,905
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	1,837,307		$	1,813,130

The accompanying notes are an integral part of these consolidated financial statements.

38

CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY

(Dollars in thousands except per share amounts)

	Common Stock
	Common Shares Outstanding		Amount			Common Shares to be Issued for Deferred Compensation Obligations			Retained Earnings			Accumulated Other Comprehensive Income (Loss)			Totals
Balance, January 1, 2016	7,799,867		$	139,198		$	4,592		$	39,960		$	221		$	183,971
Comprehensive income (loss)	—		—			—			13,799			(2,999		)	10,800
Issuance of common stock	179,903		5,023			—			—			—			5,023
Common stock issued for deferred compensation obligations	—		—			—			—			—			—
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	—		127			(127		)	—			—			—
Share-based payment awards under equity compensation plan	—		—			573			—			—			573
Common stock purchased for deferred compensation obligations	—		(383		)	—			—			—			(383		)
Common stock repurchased pursuant to publicly announced repurchase plan	(158,701	)	(4,440		)	—			—			—			(4,440		)
Cash dividends paid ($0.98 per common share)	—		—			—			(7,645		)	—			(7,645		)
Balance, December 31, 2016	7,821,069		139,525			5,038			46,114			(2,778		)	187,899
Comprehensive income (loss)	—		—			—			13,237			543			13,780
Reclassification resulting from the enactment of the Tax Act	—		—			—			367			(367		)	—
Issuance of common stock	220,510		6,177			—			—			—			6,177
Common stock issued for deferred compensation obligations	—		—			—			—			—			—
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	—		176			(176		)	—			—			—
Share-based payment awards under equity compensation plan	—		—			640			—			—			640
Common stock purchased for deferred compensation obligations	—		(420		)	—			—			—			(420		)
Common stock repurchased pursuant to publicly announced repurchase plan	(184,286	)	(5,181		)	—			—			—			(5,181		)
Cash dividends paid ($1.02 per common share)	—		—			—			(7,990		)	—			(7,990		)
Balance, December 31, 2017	7,857,293		140,277			5,502			51,728			(2,602		)	194,905
Comprehensive income (loss)	—		—			—			14,021			(5,306		)	8,715
Adoption of ASU 2016-01	—		—			—			(223		)	223			—
Issuance of common stock	261,693		6,864			—			—			—			6,864
Common stock issued for deferred compensation obligations	—		—			—			—			—			—
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	—		683			(683		)	—			—			—
Share-based payment awards under equity compensation plan	—		—			612			—			—			612
Common stock purchased for deferred compensation obligations	—		(401		)	—			—			—			(401		)
Common stock repurchased pursuant to publicly announced repurchase plan	(248,017	)	(7,007		)	—			—			—			(7,007		)
Cash dividends paid ($1.04 per common share)	—		—			—			(8,169		)	—			(8,169		)
Balance, December 31, 2018	7,870,969		$	140,416		$	5,431		$	57,357		$	(7,685	)	$	195,519

The accompanying notes are an integral part of these consolidated financial statements.

39

CONSOLIDATED STATEMENTS OF INCOME

(Dollars in thousands except per share amounts)

	Year Ended December 31
	2018		2017		2016
Interest income
Loans, including fees	$	49,229	$	43,537	$	38,537
AFS securities
Taxable	8,239		8,410		8,591
Nontaxable	5,279		5,570		5,715
Federal funds sold and other	1,117		896		823
Total interest income	63,864		58,413		53,666
Interest expense
Deposits	9,261		6,809		5,836
Borrowings	6,370		5,685		5,029
Total interest expense	15,631		12,494		10,865
Net interest income	48,233		45,919		42,801
Provision for loan losses	978		253		(135		)
Net interest income after provision for loan losses	47,255		45,666		42,936
Noninterest income
Service charges and fees	6,210		6,013		5,230
Earnings on corporate owned life insurance policies	707		726		761
Net gain on sale of mortgage loans	525		647		651
Net gains on sale of AFS securities	—		142		245
Other	3,504		3,284		4,221
Total noninterest income	10,946		10,812		11,108
Noninterest expenses
Compensation and benefits	22,609		21,525		19,170
Furniture and equipment	6,182		5,523		5,275
Occupancy	3,263		3,133		3,227
Other	10,763		10,044		10,225
Total noninterest expenses	42,817		40,225		37,897
Income before federal income tax expense	15,384		16,253		16,147
Federal income tax expense	1,363		3,016		2,348
NET INCOME	$	14,021	$	13,237	$	13,799
Earnings per common share
Basic	$	1.78	$	1.69	$	1.77
Diluted	$	1.74	$	1.65	$	1.73
Cash dividends per common share	$	1.04	$	1.02	$	0.98

The accompanying notes are an integral part of these consolidated financial statements.

40

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Dollars in thousands)

	Year Ended December 31
	2018			2017			2016
Net income	$	14,021		$	13,237		$	13,799
Unrealized gains (losses) on AFS securities
Unrealized gains (losses) arising during the period	(7,229		)	289			(5,865		)
Reclassification adjustment for net realized (gains) losses included in net income	—			(142		)	(245		)
Reclassification adjustment for impairment loss included in net income	—			—			770
Comprehensive income (loss) before income tax (expense) benefit	(7,229		)	147			(5,340		)
Tax effect (1)	1,415			89			1,834
Unrealized gains (losses) on AFS securities, net of tax	(5,814		)	236			(3,506		)
Unrealized gains (losses) on derivative instruments
Unrealized gains (losses) on derivative instruments arising during the period	33			43			248
Tax effect (1)	(7		)	(15		)	(84		)
Unrealized gains (losses) on derivative instruments, net of tax	26			28			164
Change in unrecognized pension cost on defined benefit pension plan
Change in unrecognized pension cost arising during the period	265			11			282
Reclassification adjustment for net periodic benefit cost included in net income	345			412			238
Net change in unrecognized pension cost	610			423			520
Tax effect (1)	(128		)	(144		)	(177		)
Change in unrealized pension cost, net of tax	482			279			343
Other comprehensive income (loss), net of tax	(5,306		)	543			(2,999		)
Comprehensive income (loss)	$	8,715		$	13,780		$	10,800

⁽¹⁾  See “Note 16 – Accumulated Other Comprehensive Income (Loss)” in the accompanying notes to consolidated financial statements for tax effect reconciliation.

The accompanying notes are an integral part of these consolidated financial statements.

41

CONSOLIDATED STATEMENTS OF CASH FLOWS

(Dollars in thousands)

	Year Ended December 31
	2018			2017			2016
OPERATING ACTIVITIES
Net income	$	14,021		$	13,237		$	13,799
Reconciliation of net income to net cash provided by operating activities:
Undistributed earnings of equity securities without readily determinable fair values	(144		)	40			791
Provision for loan losses	978			253			(135		)
Impairment of foreclosed assets	—			2			10
Depreciation	2,940			2,902			2,821
Amortization of OMSR	218			340			394
Amortization of acquisition intangibles	96			119			162
Net amortization of AFS securities	1,873			2,144			2,747
AFS security impairment loss	—			—			770
Net unrealized (gains) losses on equity securities, at fair value	41			—			—
Net (gains) losses on sale of AFS securities	—			(142		)	(245		)
Net (gains) losses on sale of equity securities, at fair value	(1		)	—			—
Net gain on sale of mortgage loans	(525		)	(647		)	(651		)
Increase in cash value of corporate owned life insurance policies	(707		)	(726		)	(761		)
Gains from redemption of corporate owned life insurance policies	—			—			(469		)
Share-based payment awards under equity compensation plan	612			640			573
Deferred income tax expense (benefit)	275			2,836			(282		)
Origination of loans held-for-sale	(29,242		)	(36,276		)	(33,089		)
Proceeds from loan sales	30,969			37,179			33,111
Net changes in operating assets and liabilities which provided (used) cash:
Accrued interest receivable	135			(483		)	(311		)
Other assets	113			800			455
Accrued interest payable and other liabilities	358			(2,497		)	550
Net cash provided by (used in) operating activities	22,010			19,721			20,240
INVESTING ACTIVITIES
Activity in AFS securities
Sales	—			12,827			35,664
Maturities, calls, and principal payments	80,005			97,617			137,278
Purchases	(35,211		)	(106,510		)	(79,514		)
Sale of equity securities, at fair value	3,537			—			—
Net loan principal (originations) collections	(37,958		)	(81,188		)	(160,294		)
Proceeds from sales of foreclosed assets	403			269			486
Purchases of premises and equipment	(2,305		)	(2,038		)	(3,804		)
Proceeds from redemption of corporate owned life insurance policies	—			—			1,353
Purchases of FHLB Stock	(1,350		)	(1,800		)	(200		)
Funding of low income housing tax credit investments	(651		)	(932		)	(878		)
Net cash provided by (used in) investing activities	6,470			(81,755		)	(69,909		)

42

CONSOLIDATED STATEMENTS OF CASH FLOWS (continued)

(Dollars in thousands)

	Year Ended December 31
	2018			2017			2016
FINANCING ACTIVITIES
Net increase (decrease) in deposits	$	27,435		$	70,218		$	30,477
Net increase (decrease) in borrowed funds	(4,579		)	7,184			27,962
Cash dividends paid on common stock	(8,169		)	(7,990		)	(7,645		)
Proceeds from issuance of common stock	6,864			6,177			5,023
Common stock repurchased	(7,007		)	(5,181		)	(4,440		)
Common stock purchased for deferred compensation obligations	(401		)	(420		)	(383		)
Net cash provided by (used in) financing activities	14,143			69,988			50,994
Increase (decrease) in cash and cash equivalents	42,623			7,954			1,325
Cash and cash equivalents at beginning of period	30,848			22,894			21,569
Cash and cash equivalents at end of period	$	73,471		$	30,848		$	22,894
SUPPLEMENTAL CASH FLOWS INFORMATION:
Interest paid	$	15,485		$	12,388		$	10,836
Income taxes paid	50			3,120			1,415
SUPPLEMENTAL NONCASH INFORMATION:
Transfers of loans to foreclosed assets	$	467		$	331		$	306

The accompanying notes are an integral part of these consolidated financial statements.

43

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Dollars in thousands except per share amounts)

Note 1 – Nature of Operations and Summary of Significant Accounting Policies

BASIS OF PRESENTATION AND CONSOLIDATION: The consolidated financial statements include the accounts of Isabella Bank Corporation, a financial services holding company, and its wholly owned subsidiary, Isabella Bank. All intercompany balances and accounts have been eliminated in consolidation. References to “the Corporation”, “Isabella”, “we”, “our”, “us”, and similar terms refer to the consolidated entity consisting of Isabella Bank Corporation and its subsidiary. References to Isabella Bank or the “Bank” refers to Isabella Bank Corporation’s subsidiary, Isabella Bank.

For additional information, see “Note 18 – Related Party Transactions.”

NATURE OF OPERATIONS: Isabella Bank Corporation is a financial services holding company offering a wide array of financial products and services in several mid-Michigan counties. Our banking subsidiary, Isabella Bank, offers banking services through 30 locations, 24 hour banking services locally and nationally through shared automatic teller machines, 24 hour online banking, mobile banking, and direct deposits to businesses, institutions, individuals and their families. Lending services offered include commercial loans, agricultural loans, residential real estate loans, and consumer loans. Deposit services include interest and noninterest bearing checking accounts, savings accounts, money market accounts, certificates of deposit, direct deposits, cash management services, mobile and internet banking, electronic bill pay services, and automated teller machines. Other related financial products include trust and investment services, safe deposit box rentals, and credit life insurance. Active competition, principally from other commercial banks, savings and loan associations, mortgage brokers, finance companies, credit unions, and retail brokerage firms exists in all of our principal markets. Our results of operations can be significantly affected by changes in interest rates, changes in the local economic environment and changes in regulations.

USE OF ESTIMATES: In preparing consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, we make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheet and reported amounts of revenues and expenses during the reporting year. Actual results could differ from those estimates.

Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the ALLL, the fair value of AFS investment securities, and the valuation of goodwill and other intangible assets.

FAIR VALUE MEASUREMENTS: Fair value refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data. We may choose to measure eligible items at fair value at specified election dates.

For assets and liabilities recorded at fair value, it is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements for those financial instruments for which there is an active market. In cases where the market for a financial asset or liability is not active, we include appropriate risk adjustments that market participants would make for nonperformance and liquidity risks when developing fair value measurements. Fair value measurements for assets and liabilities for which limited or no observable market data exists are accordingly based primarily upon estimates, are often calculated based on the economic and competitive environment, the characteristics of the asset or liability and other factors. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values.

We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Investment securities AFS and derivative instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as mortgage loans AFS, impaired loans, foreclosed assets, OMSR, goodwill, and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write downs of individual assets.

44

Fair Value Hierarchy

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

For further discussion of fair value considerations, refer to “Note 17 – Fair Value.”

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK: Most of our activities are conducted with customers located within the central Michigan area. A significant amount of our outstanding loans are secured by commercial and residential real estate. Other than these types of loans, there is no significant concentration to any other industry or any one customer.

CASH AND CASH EQUIVALENTS: For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash and balances due from banks, federal funds sold, and other deposit accounts. Generally, federal funds sold are for a one day period. We maintain deposit accounts in various financial institutions which generally exceed federally insured limits or are not insured. We do not believe we are exposed to any significant interest, credit or other financial risk as a result of these deposits.

AFS SECURITIES: Purchases of investment securities are generally classified as AFS. However, we may elect to classify securities as either held to maturity or trading. Securities classified as AFS debt securities are recorded at fair value, with unrealized gains and losses, net of the effect of deferred income taxes, excluded from earnings and reported in other comprehensive income. Included in AFS securities are auction rate money market preferred securities. These investments, for federal income tax purposes, have no federal income tax impact given the nature of the investments. Auction rate money market preferred securities and preferred stocks are recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income. Purchase premiums and discounts are recognized in interest income using the interest method over the term of the securities. Realized gains and losses on the sale of AFS securities are determined using the specific identification method.

AFS securities are reviewed quarterly for possible OTTI. In determining whether an OTTI exists for debt securities, we assert that: (a) we do not have the intent to sell the security; and (b) it is more likely than not we will not have to sell the security before recovery of its cost basis. If these conditions are not met, we recognize an OTTI charge through earnings for the difference between the debt security’s amortized cost basis and its fair value, and such amount is included in noninterest income. For debt securities that do not meet the above criteria, and we do not expect to recover the security’s amortized cost basis, the security is considered other-than-temporarily impaired. For these debt securities, we separate the total impairment into the credit risk loss component and the amount of the loss related to market and other risk factors. In order to determine the amount of the credit loss for a debt security, we calculate the recovery value by performing a discounted cash flow analysis based on the current cash flows and future cash flows we expect to recover. The amount of the total OTTI related to the credit risk is recognized in earnings and is included in noninterest income. The amount of the total OTTI related to other risk factors is recognized as a component of other comprehensive income. For debt securities that have recognized OTTI through earnings, if through subsequent evaluation there is a significant increase in the cash flow expected, the difference between the amortized cost basis and the cash flows expected to be collected is accreted as interest income.

AFS equity securities are reviewed for OTTI at each reporting date. This evaluation considers a number of factors including, but not limited to, the length of time and extent to which the fair value has been less than cost, the financial condition and near term prospects of the issuer, and our ability and intent to hold the securities until fair value recovers. If it is determined that we do not have the ability and intent to hold the securities until recovery or that there are conditions that indicate that a security may not recover in value then the difference between the fair value and the cost of the security is recognized in earnings and is included in noninterest income.

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LOANS: Loans that we have the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding principal balance adjusted for any charge-offs, the ALLL, and any deferred fees or costs on originated loans. Interest income on loans is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the appropriate yield methods.

The accrual of interest on agricultural, commercial and mortgage loans is discontinued at the time the loan is 90 days or more past due unless the credit is well secured and in the process of collection. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. For loans that are placed on nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected is charged against the ALLL. Interest income on loans in nonaccrual status is not recognized until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. For impaired loans not classified as nonaccrual, interest income continues to be accrued over the term of the loan based on the principal amount outstanding.

ALLOWANCE FOR LOAN AND LEASE LOSSES: The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when we believe the uncollectability of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.

We evaluate the ALLL on a regular basis. Our periodic review of the collectability of loans considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.

The ALLL consists of specific, general, and unallocated components. The specific component relates to loans that are deemed to be impaired. For such loans that are analyzed for specific allowance allocations, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non-impaired loans and is based on historical loss experience adjusted for current conditions. An unallocated component is maintained to cover uncertainties that we believe affect our estimate of probable losses based on qualitative factors. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance;

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment.

LOANS HELD FOR SALE: Mortgage loans held for sale on the secondary market are carried at the lower of cost or fair value as determined by aggregating outstanding commitments from investors or current investor yield requirements. Net unrealized losses, if any, would be recognized as a component of other noninterest expenses.

Mortgage loans held for sale are sold with the mortgage servicing rights retained by us. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.

TRANSFERS OF FINANCIAL ASSETS: Transfers of financial assets, including mortgage loans and participation loans, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is determined to be surrendered when 1) the assets have been legally isolated from us, 2) the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and 3) we do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Other than servicing, we have no substantive continuing involvement related to these loans.

SERVICING: Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. We have no purchased servicing rights. For sales of mortgage loans, a portion of the cost of originating the

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loan is allocated to the servicing right based on relative fair value. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.

Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights into tranches based on predominant risk characteristics, such as interest rate, loan type, and investor type. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranche. If we later determine that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the valuation allowance may be recorded as an increase to income. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. The unpaid principal balance of mortgages serviced for others was $259,481 and $266,789 with capitalized servicing rights of $2,435 and $2,409 at December 31, 2018 and 2017, respectively.

Servicing fee income is recorded for fees earned for servicing loans for others. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. We recorded servicing fee revenue of $651, $671, and $696 related to residential mortgage loans serviced for others during 2018, 2017, and 2016, respectively, which is included in other noninterest income.

FORECLOSED ASSETS: Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at the lower of our carrying amount or fair value less estimated selling costs at the date of transfer, establishing a new cost basis. Any write downs based on the asset’s fair value at the date of acquisition are charged to the ALLL. After foreclosure, property held for sale is carried at the lower of the new cost basis or fair value less costs to sell. Impairment losses on property to be held and used are measured at the amount by which the carrying amount of property exceeds its fair value. Costs relating to holding these assets are expensed as incurred. We periodically perform valuations and any subsequent write downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the lower of our carrying amount or fair value less costs to sell. Foreclosed assets of $355 and $291 as of December 31, 2018 and 2017, respectively, are included in other assets.

PREMISES AND EQUIPMENT: Land is carried at cost. Buildings and equipment are carried at cost, less accumulated depreciation which is computed principally by the straight-line method based upon the estimated useful lives of the related assets, which range from 3 to 40 years. Major improvements are capitalized and appropriately amortized based upon the useful lives of the related assets or the expected terms of the leases, if shorter, using the straight-line method. Maintenance, repairs and minor alterations are charged to current operations as expenditures occur. We annually review these assets to determine whether carrying values have been impaired.

EQUITY SECURITIES WITHOUT READILY DETERMINABLE FAIR VALUES: Included in equity securities without readily determinable fair values are our holdings in FHLB stock and FRB stock as well as our ownership interest in Corporate Settlement Solutions, LLC. Our investment in Corporate Settlement Solutions, LLC, a title insurance company, was made in the 1st quarter of 2008. We are not the managing entity of Corporate Settlement Solutions, LLC, and account for our investment in that entity under the equity method of accounting.

Equity securities without readily determinable fair values consist of the following holdings as of December 31:

	2018		2017
FHLB Stock	$	15,050	$	13,700
Corporate Settlement Solutions, LLC	7,565		7,421
FRB Stock	1,999		1,999
Other	334		334
Total	$	24,948	$	23,454

EQUITY COMPENSATION PLAN: At December 31, 2018, the Directors Plan had 220,171 shares eligible to be issued to participants, for which the Rabbi Trust held 16,673 shares. We had 226,909 shares to be issued at December 31, 2017, with 31,769 shares held in the Rabbi Trust. Compensation costs relating to share-based payment transactions are recognized as the services are rendered, with the cost measured based on the fair value of the equity or liability instruments issued (see “Note 12 – Benefit Plans”).

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CORPORATE OWNED LIFE INSURANCE: We have purchased life insurance policies on key members of management, partially for the purpose of funding certain post-retirement benefits. In the event of death of one of these individuals, we would receive a specified cash payment equal to the face value of the policy. Such policies are recorded at their cash surrender value, or the amount that can be realized on the balance sheet date. Increases in cash surrender value in excess of single premiums paid are reported as other noninterest income.

As of December 31, 2018 and 2017, the present value of the post retirement benefits payable by us to the covered insured participants was estimated to be $2,751 and $2,751, respectively, and is included in accrued interest payable and other liabilities. The expenses associated with these policies totaled $0, $577, and $(8) for 2018, 2017, and 2016, respectively.

ACQUISITION INTANGIBLES AND GOODWILL: We previously acquired branch facilities and related deposits in business combinations accounted for as a purchase. The acquisitions included amounts related to the valuation of customer deposit relationships (core deposit intangibles). Core deposit intangibles arising from acquisitions are included in goodwill and other intangible assets are being amortized over their estimated lives and evaluated for potential impairment on at least an annual basis. Goodwill, which represents the excess of the purchase price over identifiable assets, is not amortized but is evaluated for impairment on at least an annual basis. Acquisition intangibles and goodwill are typically qualitatively evaluated to determine if it is more likely than not that the carrying balance is impaired. If it is determined that the carrying balance is more likely than not to be impaired, we perform a cash flow valuation to determine the extent of the potential impairment. This valuation method requires a significant degree of our judgment. In the event the projected undiscounted net operating cash flows for these intangible assets are less than the carrying value, the asset is recorded at fair value as determined by the valuation model.

OFF BALANCE SHEET CREDIT RELATED FINANCIAL INSTRUMENTS: In the ordinary course of business, we have entered into commitments to extend credit, including commitments under credit card arrangements, commercial lines of credit, home equity lines of credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded only when funded.

REVENUE RECOGNITION: Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities, earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of investment and trust advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation.

FEDERAL INCOME TAXES: Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax assets or liabilities are determined based on the tax effects of the temporary differences between the book and tax basis on the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. Valuation allowances are established, where necessary, to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable or refundable for the year plus or minus the change during the year in deferred tax assets and liabilities.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21%. In accordance with ASC 740, Income Taxes, the effect of income tax law changes on deferred taxes was recognized as a component of income tax expense related to continuing operations in the period in which the law was enacted. As such, federal income tax expense for the year ended December 31, 2017 reflects the effect of the tax rate change on net deferred tax assets and liabilities (see “Note 15 – Federal Income Taxes” and “Note 16 – Accumulated Other Comprehensive Income (Loss)”).

We analyze our filing positions in the jurisdictions where we are required to file income tax returns, as well as all open tax years in these jurisdictions. We also treat interest and penalties attributable to income taxes, to the extent they arise, as a component of our noninterest expenses.

DEFINED BENEFIT PENSION PLAN: We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. The service cost component of the defined benefit pension plan is included in “compensation and benefits” on the consolidated statements of income and is funded consistent with the requirements of federal laws and regulations. All other costs related to the defined benefit pension plan are included in “other” noninterest expenses on the consolidated statements of income. The current benefit obligation is included in "accrued interest payable and other liabilities" on the consolidated balance sheets. Inherent in the determination of defined benefit pension costs are assumptions concerning future events that will affect the amount and timing of required benefit payments under the plan. These assumptions include demographic assumptions such as mortality, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic benefit cost includes the interest cost based on the assumed discount rate, an expected return on plan assets based on an actuarially derived market-related value of assets, and amortization of

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unrecognized net actuarial gains or losses. Actuarial gains and losses result from experience different from that assumed and from changes in assumptions (excluding asset gains and losses not yet reflected in market-related value). Amortization of actuarial gains and losses is included as a component of net periodic defined benefit pension cost.

For additional information, see “Note 12 – Benefit Plans.”

MARKETING COSTS: Marketing costs are expensed as incurred (see “Note 14 – Other Noninterest Expenses”).

RECLASSIFICATIONS: Certain amounts reported in the 2017 and 2016consolidated financial statements have been reclassified to conform with the 2018 presentation.

Note 2 – Accounting Standards Updates

Recently Adopted Accounting Standards Updates

ASU No. 2014-09: “Revenue from Contracts with Customers”

In May 2014, ASU No. 2014-09 was issued and created new Topic 606 to provide a common revenue standard to achieve consistency and clarification to the revenue recognition principles. The guidance outlines steps to achieve the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. These steps consist of: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation.

The new authoritative guidance, as amended, was effective on January 1, 2018. We reviewed our contracts related to trust and investment services and those related to other noninterest income to determine if changes in income recognition were required as a result of this guidance. Implementation of this guidance did not have a significant impact on our operating results for the year ended December 31, 2018.

ASU No. 2016-01: “Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities” and ASU No. 2018-03: “Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10: Recognition and Measurement of Financial Assets and Financial Liabilities”

In January 2016, ASU No. 2016-01 was issued and sets forth the following: 1) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; 2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment and requiring measurement of the investment at fair value when an impairment exists; 3) for public entities, eliminates the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) for public entities, requires the use of exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and 7) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets.

The new authoritative guidance was effective for interim and annual periods beginning after December 15, 2017. As a result of this guidance, the change in the fair value of equity investments has been recorded in net income beginning on January 1, 2018 (see “Note 17 – Fair Value”). Equity securities are now recorded separately from AFS securities at a fair value which approximates an exit price notion. Adoption of this guidance did not have a significant impact on our operations and its future impact will depend on the fair value of these investments, or any securities acquired subsequent to this guidance, at future measurement dates. The disclosures related to equity investment securities reflect a fully retrospective presentation for comparative purposes.

For discussion of the fair value measurement of financial instruments, refer to “Note 17 – Fair Value”.

In February 2018, ASU No. 2018-03 was issued and sets forth correction or improvement amendments for specific issues that may arise within the scope of ASU 2016-01. These amendments have been adopted and did not have a significant impact on our operating results or financial statement disclosures.

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ASU No. 2017-08: “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities”

In March 2017, ASU No. 2017-08 amended the amortization period for certain purchased callable debt securities held at a premium. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this update shorten the amortization period and require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2018 with early adoption permitted. The guidance has been adopted and did not have a significant impact on our operating results or financial statement disclosures.

ASU No. 2017-09: “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting”

In May 2017, ASU No. 2017-09 was issued and provided guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this update. An entity should account for the effects of a modification unless all of the following are met:

1. The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification.

2. The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified.

3. The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.

The new authoritative guidance was effective on January 1, 2018 and did not have a significant impact on our operating results or financial statement disclosures.

Pending Accounting Standards Updates

ASU No. 2016-02: “Leases (Topic 842)”

In February 2016, ASU No. 2016-02 was issued to create Topic 842 - Leases which will require recognition of lease assets and lease liabilities on the balance sheet for leases previously classified as operating leases. Accounting guidance is set forth for both lessee and lessor accounting. Under lessee accounting, a lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term.

For finance leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize interest on the lease liability separately from amortization of the right-of-use asset in the statement of comprehensive income; and 3) classify repayments of the principal portion of the lease liability within financing activities and payments of interest on the lease liability and variable lease payments within operating activities in the statement of cash flows. For operating leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis; and 3) classify all cash payments within operating activities in the statement of cash flows.

The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2018. We have reviewed our lease agreements to determine the appropriate treatment under this guidance. These changes will not have a significant impact on our operating results or financial statement disclosures upon adoption.

In July 2018, ASU No. 2018-10 was issued and provided codification improvements for various leasing issues. Also during July 2018, ASU No. 2018-11 was issued for targeted improvements related to the transition of the new guidance. In December

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2018, ASU No. 2018-20 was issued and provided narrow-scope improvements for lessors. These updates are effective with the implementation of ASU 2016-02.

ASU No. 2016-13: “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”

In June 2016, ASU No. 2016-13 was issued and updated the measurement for credit losses for AFS debt securities and assets measured at amortized cost which include loans, trade receivables, and any other financial assets with the contractual right to receive cash. Current GAAP requires an “incurred loss” methodology for recognizing credit losses that delays recognition until it is probable a loss has been incurred. Under the incurred loss approach, entities are limited to a probable initial recognition threshold when credit losses are measured under GAAP; an entity generally only considers past events and current conditions in measuring the incurred loss.

Under the new guidance, the incurred loss impairment methodology in current GAAP is replaced with a methodology that reflects current expected credit losses (CECL). This methodology requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances which applies to assets measured either collectively or individually.

The update allows an entity to revert to historical loss information that is reflective of the contractual term (considering the effect of prepayments) for periods that are beyond the time frame for which the entity is able to develop reasonable and supportable forecasts. In addition, the disclosures of credit quality indicators in relation to the amortized cost of financing receivables, a current disclosure requirement, are further disaggregated by year of origination (or vintage). The vintage information will be useful for financial statement users to better assess changes in underwriting standards and credit quality trends in asset portfolios over time and the effect of those changes on credit losses.

Overall, the update will allow entities the ability to measure expected credit losses without the restriction of incurred or probable losses that exist under current GAAP. For users of the financial statements, the update requires disclosure of decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019 and may have a significant impact on our operations and financial statement disclosures as well as that of the banking industry as a whole.

We have invested a considerable amount of effort toward this guidance and will continue to invest considerable effort until its effective date. A committee was formed and has developed a road map to implementation, and the committee is accountable for timely and accurate adoption of the guidance. A company that has been focused on the ALLL for more than 10 years and serves hundreds of financial institutions has been engaged to provide us with education, advisory, and software solutions exclusively related to the ACL. We expect to run parallel processes during 2019, which will help to ensure we are ready to calculate, review, and report the ACL by the required implementation date.

In November 2018, ASU No. 2018-19 was issued and provided codification improvements for two issues: transition and effective date for nonpublic business entities and operating lease receivables. The update is effective with the implementation of ASU 2016-13 and is not expected to impact our operating results or financial statement disclosures.

ASU No. 2018-13: “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement”

In August 2018, ASU No. 2018-13 was issued and provided an updated framework related to fair value disclosures. For entities required to make disclosures about recurring or nonrecurring fair value measurements, the update provides disclosure modifications which include the removal, modification and addition of specific disclosure requirements.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019 and will impact our financial statement disclosures.

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ASU No. 2018-14: “Compensation - Retirement Benefits - Defined Pension Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans”

In August 2018, ASU No. 2018-14 was issued and provided updated framework related to defined benefit plans. For employers that sponsor defined benefit pension or other postretirement plans, the update provides disclosure modifications which include the removal of six specific requirements, the addition of two specific requirements and clarification to existing requirements.

Disclosure additions include 1) the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates; 2) an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. Clarification items relate to 1) the projected benefit obligation (PBO) and fair value of plan assets for plans with PBOs in excess of plan assets; and 2) the accumulated benefit obligation (ABO) and fair value of plan assets for plans with ABOs in excess of plan assets.

The new authoritative guidance is effective for fiscal years ending after December 15, 2020, with early adoption permitted, and will likely impact our financial statement disclosures.

ASU No. 2018-15: “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract”

In August 2018, ASU No. 2018-15 was issued and provided guidance on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) for entities that are a customer in a hosting arrangement that is a service contract. The guidance also provides clarification on requirements to capitalize implementation costs and the required accounting for expenses related to capitalization of implementation costs.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted. The impact on our operating results and financial statement disclosures as a result of this update will depend upon our arrangements and whether or not they meet the requirement to be capitalized.

ASU No. 2018-16: “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate of Hedge Accounting Purposes”

In October 2018, ASU No. 2018-16 was issued and permits the OIS rate based on SOFR as a U.S. benchmark interest rate. Including the OIS rate based on SOFR as an eligible benchmark interest rate during the early stages of the marketplace transition will facilitate the LIBOR to SOFR transition and provide sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes.

For entities that have not already adopted ASU No. 2017-12 (“Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities”), the amendments in this update are required to be adopted concurrently with the amendments in ASU No. 2017-12. For entities that already have adopted ASU No. 2017-12, the amendments in this update are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. The amendments in this update are not expected to have a significant impact on our operating results or financial statement disclosures.

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Note 3 – AFS Securities

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:

	2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	172	$	—	$	2	$	170
States and political subdivisions	188,992		2,125		251		190,866
Auction rate money market preferred	3,200		—		646		2,554
Mortgage-backed securities	189,688		76		5,280		184,484
Collateralized mortgage obligations	119,193		71		2,504		116,760
Total	$	501,245	$	2,272	$	8,683	$	494,834

	2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	217	$	—	$	1	$	216
States and political subdivisions	204,131		4,486		143		208,474
Auction rate money market preferred	3,200		—		151		3,049
Mortgage-backed securities	210,757		390		2,350		208,797
Collateralized mortgage obligations	129,607		160		1,573		128,194
Total	$	547,912	$	5,036	$	4,218	$	548,730

The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2018 are as follows:

	Maturing								Securities with Variable Monthly Payments or Noncontractual Maturities
	Due in One Year or Less		After One Year But Within Five Years		After Five Years But Within Ten Years		After Ten Years				Total
Government sponsored enterprises	$	—	$	172	$	—	$	—	$	—	$	172
States and political subdivisions	23,151		81,901		55,923		28,017		—		188,992
Auction rate money market preferred	—		—		—		—		3,200		3,200
Mortgage-backed securities	—		—		—		—		189,688		189,688
Collateralized mortgage obligations	—		—		—		—		119,193		119,193
Total amortized cost	$	23,151	$	82,073	$	55,923	$	28,017	$	312,081	$	501,245
Fair value	$	23,189	$	82,662	$	56,842	$	28,343	$	303,798	$	494,834

Expected maturities for government sponsored enterprises and states and political subdivisions may differ from contractual maturities because issuers may have the right to call or prepay obligations.

As the auction rate money market preferred investments have continual call dates, they are not reported by a specific maturity group. Because of their variable monthly payments, mortgage-backed securities and collateralized mortgage obligations are not reported by a specific maturity group.

A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table. There were no sales of AFS securities during 2018.

	2017		2016
Proceeds from sales of AFS securities	$	12,827	$	35,664
Gross realized gains (losses)	$	142	$	245
Applicable income tax expense (benefit)	$	48	$	83

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The following information pertains to AFS securities with gross unrealized losses at December 31 aggregated by investment category and length of time that individual securities have been in a continuous loss position.

	2018
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	—	$	—	$	2	$	170	$	2
States and political subdivisions	83		14,732		168		15,090		251
Auction rate money market preferred	—		—		646		2,554		646
Mortgage-backed securities	896		43,485		4,384		124,253		5,280
Collateralized mortgage obligations	199		21,886		2,305		87,929		2,504
Total	$	1,178	$	80,103	$	7,505	$	229,996	$	8,683
Number of securities in an unrealized loss position:			66				102		168

	2017
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	1	$	216	$	—	$	—	$	1
States and political subdivisions	142		16,139		1		188		143
Auction rate money market preferred	—		—		151		3,049		151
Mortgage-backed securities	454		72,007		1,896		76,065		2,350
Collateralized mortgage obligations	701		76,435		872		25,308		1,573
Total	$	1,298	$	164,797	$	2,920	$	104,610	$	4,218
Number of securities in an unrealized loss position:			81				24		105

Unrealized losses on our AFS securities portfolio are the result of recent increases in intermediate-term and long-term benchmark interest rates and not credit issues.

As of December 31, 2018 and 2017, we conducted an analysis to determine whether any securities currently in an unrealized loss position should be identified as other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria:

• Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate?

• Is the investment credit rating below investment grade?

• Is it probable the issuer will be unable to pay the amount when due?

• Is it more likely than not that we will have to sell the security before recovery of its cost basis?

• Has the duration of the investment been extended?

During the fourth quarter of 2016, we identified one municipal bond as other-than-temporarily impaired. While management estimated the OTTI to be realized, we also engaged the services of an independent investment valuation firm to estimate the amount of impairment as of December 31, 2016. The valuation calculated the estimated market value utilizing two different approaches:

1) Market - Appraisal and Comparable Investments

2) Income - Discounted Cash Flow Method

The two methods were then weighted, with a higher weighting applied to the Market approach, to determine the estimated impairment. As a result of this analysis, we reduced the carrying value to $230 which required us to recognize an OTTI of $770 in earnings for the year ended December 31, 2016. Based on internal analysis of the bond as of December 31, 2018, a change in the estimated valuation was not deemed necessary and the carrying value of this bond remained at $230.

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The following table provides a roll-forward of credit related impairment recorded in earnings for the years ended December 31:

	2018		2017		2016
Balance at beginning of the period	$	770	$	770	$	—
Additions to credit losses for which no previous OTTI was recognized	—		—		770
Reductions for credit losses realized on securities sold during the period	—		—		—
Balance at end of the period	$	770	$	770	$	770

Based on our analysis which included the criteria outlined above, the fact that we have asserted that we do not have the intent to sell AFS securities in an unrealized loss position, and considering it is unlikely that we will have to sell any AFS securities in an unrealized loss position before recovery of their cost basis, we do not believe that the values of any other AFS securities are other-than-temporarily impaired as of December 31, 2018 and 2017, with the exception of the one municipal bond discussed above.

Note 4 – Loans and ALLL

We grant commercial, agricultural, residential real estate, and consumer loans to customers situated primarily in Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw counties in Michigan. The ability of the borrowers to honor their repayment obligations is often dependent upon the real estate, agricultural, manufacturing, retail, gaming, tourism, higher education, and general economic conditions of this region. Substantially all of our consumer and residential real estate loans are secured by various items of property, while commercial loans are secured primarily by real estate, business assets, and personal guarantees. Some loans are unsecured.

Loans that we have the intent and ability to hold in our portfolio are reported at their outstanding principal balance adjusted for any charge-offs, the ALLL, and any deferred fees or costs. Interest income is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the appropriate yield methods.

The accrual of interest on commercial, agricultural, and residential real estate loans is discontinued at the time the loan is 90 days or more past due unless the credit is well-secured and in the process of short-term collection. Upon transferring the loans to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful.

When loans are placed in nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected, is charged against the ALLL. Loans may be returned to accrual status after six months of continuous performance and achievement of current payment status.

Commercial and agricultural loans include loans for commercial real estate, commercial operating loans, advances to mortgage brokers, farmland and agricultural production, and loans to states and political subdivisions. Repayment of these loans is dependent upon the successful operation and management of a business. We minimize our risk by limiting the amount of direct credit exposure to any one borrower to $15,000. Borrowers with direct credit needs of more than $15,000 may be serviced through the use of loan participations with other commercial banks. Commercial and agricultural real estate loans commonly require loan-to-value limits of 80% or less. Depending upon the type of loan, past credit history, and current operating results, we may require the borrower to pledge accounts receivable, inventory, property, or equipment. Personal guarantees are generally required from the owners of closely held corporations, partnerships, and sole proprietorships. In addition, we may require annual financial statements, prepare cash flow analyses, and review credit reports.

We entered into a mortgage purchase program in 2016 with a financial institution where we participate in advances to mortgage brokers ("advances"). The mortgage brokers originate residential mortgage loans with the intent to sell them on the secondary market. We participate in the advance to the mortgage broker, which is secured by the underlying mortgage loan, until it is ultimately sold on the secondary market. As such, the average life of each participated advance is approximately 20-30 days. Funds from the sale of the loan are used to pay off our participation in the advance to the mortgage broker. We classify these advances as commercial loans and include the outstanding balance in commercial loans on our consolidated balance sheet. Under the participation agreement, we committed to a maximum outstanding aggregate amount of $30,000. The difference between our outstanding balance and the maximum outstanding aggregate amount is classified as “Unfunded commitments

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under lines of credit” in the “Contractual Obligations and Loan Commitments” section of the Management's Discussion and Analysis of Financial Condition and Results of Operations of this report.

We offer adjustable rate mortgages, construction loans, and fixed rate residential real estate loans which have amortization periods up to a maximum of 30 years. We consider the anticipated direction of interest rates, balance sheet duration, the sensitivity of our balance sheet to changes in interest rates, our liquidity needs, and overall loan demand to determine whether or not to sell fixed rate loans to Freddie Mac.

Our lending policies generally limit the maximum loan-to-value ratio on residential real estate loans to 100% of the lower of the appraised value of the property or the purchase price. Private mortgage insurance is typically required on loans with loan-to-value ratios in excess of 80% unless the loan qualifies for government guarantees.

Underwriting criteria for residential real estate loans generally include:

• Evaluation of the borrower’s ability to make monthly payments.

• Evaluation of the value of the property securing the loan.

• Ensuring the payment of principal, interest, taxes, and hazard insurance does not exceed 28% of a borrower’s gross income.

• Ensuring all debt servicing does not exceed 40% of income.

• Verification of acceptable credit reports.

• Verification of employment, income, and financial information.

Appraisals are performed by independent appraisers and reviewed for appropriateness. Generally, mortgage loan requests are reviewed by our mortgage loan committee or through a secondary market underwriting system; loans in excess of $1,000 require the approval of our Internal Loan Committee, the Executive Loan Committee, the Board of Directors’ Loan Committee, or the Board of Directors.

Consumer loans include secured and unsecured personal loans. Loans are amortized for a period of up to 15 years based on the age and value of the underlying collateral. The underwriting emphasis is on a borrower’s perceived intent and ability to pay rather than collateral value. No consumer loans are sold to the secondary market.

The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the ALLL when we believe the uncollectability of the loan balance is probable. Subsequent recoveries, if any, are credited to the ALLL.

The ALLL is evaluated on a regular basis for appropriateness. Our periodic review of the collectability of the loans considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.

The primary factors behind the determination of the level of the ALLL are specific allocations for impaired loans, historical loss percentages, as well as unallocated components. Specific allocations for impaired loans are primarily determined based on the difference between the loan’s outstanding balance and the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell. Historical loss allocations are calculated at the loan class and segment levels based on a migration analysis of the loan portfolio, with the exception of advances to mortgage brokers, over the preceding five years. With no historical losses on advances to mortgage brokers, there is no allocation in the commercial segment displayed in the following tables. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

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A summary of changes in the ALLL and the recorded investment in loans by segments follows:

	Allowance for Loan Losses
	Year Ended December 31, 2018
	Commercial			Agricultural		Residential Real Estate			Consumer			Unallocated		Total
January 1, 2018	$	1,706		$	611	$	2,563		$	900		$	1,920	$	7,700
Charge-offs	(626		)	—		(151		)	(324		)	—		(1,101		)
Recoveries	328			—		261			209			—		798
Provision for loan losses	1,155			164		(681		)	72			268		978
December 31, 2018	$	2,563		$	775	$	1,992		$	857		$	2,188	$	8,375

	Allowance for Loan Losses
	Year Ended December 31, 2017
	Commercial			Agricultural			Residential Real Estate			Consumer			Unallocated		Total
January 1, 2017	$	1,814		$	884		$	2,664		$	624		$	1,414	$	7,400
Charge-offs	(265		)	—			(200		)	(306		)	—		(771		)
Recoveries	453			—			206			159			—		818
Provision for loan losses	(296		)	(273		)	(107		)	423			506		253
December 31, 2017	$	1,706		$	611		$	2,563		$	900		$	1,920	$	7,700

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2018
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	443	$	132	$	1,363	$	—	$	—	$	1,938
Collectively evaluated for impairment	2,120		643		629		857		2,188		6,437
Total	$	2,563	$	775	$	1,992	$	857	$	2,188	$	8,375
Loans
Individually evaluated for impairment	$	9,899	$	14,298	$	6,893	$	9			$	31,099
Collectively evaluated for impairment	649,630		112,863		268,450		66,665				1,097,608
Total	$	659,529	$	127,161	$	275,343	$	66,674			$	1,128,707

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2017
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	650	$	—	$	1,480	$	—	$	—	$	2,130
Collectively evaluated for impairment	1,056		611		1,083		900		1,920		5,570
Total	$	1,706	$	611	$	2,563	$	900	$	1,920	$	7,700
Loans
Individually evaluated for impairment	$	8,099	$	10,598	$	7,939	$	17			$	26,653
Collectively evaluated for impairment	626,660		117,671		264,429		56,106				1,064,866
Total	$	634,759	$	128,269	$	272,368	$	56,123			$	1,091,519

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The following tables display the credit quality indicators for commercial and agricultural credit exposures based on internally assigned credit risk ratings as of December 31:

	2018
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	21	$	31	$	—	$	52	$	51	$	28	$	79	$	131
2 - High quality	4,564		13,473		—		18,037		2,729		613		3,342		21,379
3 - High satisfactory	127,573		43,199		11,793		182,565		18,325		7,039		25,364		207,929
4 - Low satisfactory	344,920		84,634		—		429,554		46,636		19,344		65,980		495,534
5 - Special mention	12,847		5,287		—		18,134		10,520		5,624		16,144		34,278
6 - Substandard	7,428		2,002		—		9,430		6,343		4,960		11,303		20,733
7 - Vulnerable	334		1,423		—		1,757		2,716		2,233		4,949		6,706
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	497,687	$	150,049	$	11,793	$	659,529	$	87,320	$	39,841	$	127,161	$	786,690

	2017
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	24	$	316	$	—	$	340	$	—	$	34	$	34	$	374
2 - High quality	8,402		12,262		—		20,664		2,909		1,024		3,933		24,597
3 - High satisfactory	131,826		46,668		12,081		190,575		21,072		8,867		29,939		220,514
4 - Low satisfactory	326,166		75,591		—		401,757		47,835		18,467		66,302		468,059
5 - Special mention	8,986		3,889		—		12,875		10,493		8,546		19,039		31,914
6 - Substandard	5,521		2,298		—		7,819		4,325		2,747		7,072		14,891
7 - Vulnerable	729		—		—		729		1,531		419		1,950		2,679
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	481,654	$	141,024	$	12,081	$	634,759	$	88,165	$	40,104	$	128,269	$	763,028

Internally assigned credit risk ratings are reviewed, at a minimum, when loans are renewed or when management has knowledge of improvements or deterioration of the credit quality of individual credits. Descriptions of the internally assigned credit risk ratings for commercial and agricultural loans are as follows:

1. EXCELLENT – Substantially Risk Free

Credit has strong financial condition and solid earnings history, characterized by:

• High liquidity, strong cash flow, low leverage.

• Unquestioned ability to meet all obligations when due.

• Experienced management, with management succession in place.

• Secured by cash.

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2. HIGH QUALITY – Limited Risk

Credit with sound financial condition and a positive trend in earnings supplemented by:

• Favorable liquidity and leverage ratios.

• Ability to meet all obligations when due.

• Management with successful track record.

• Steady and satisfactory earnings history.

• If loan is secured, collateral is of high quality and readily marketable.

• Access to alternative financing.

• Well defined primary and secondary source of repayment.

• If supported by guaranty, the financial strength and liquidity of the guarantor(s) are clearly evident.

3.HIGH SATISFACTORY – Reasonable Risk

Credit with satisfactory financial condition and further characterized by:

• Working capital adequate to support operations.

• Cash flow sufficient to pay debts as scheduled.

• Management experience and depth appear favorable.

• Loan performing according to terms.

• If loan is secured, collateral is acceptable and loan is fully protected.

4. LOW SATISFACTORY – Acceptable Risk

Credit with bankable risks, although some signs of weaknesses are shown:

• Would include most start-up businesses.

• Occasional instances of trade slowness or repayment delinquency – may have been 10-30 days slow within the past year.

• Management’s abilities are apparent yet unproven.

• Weakness in primary source of repayment with adequate secondary source of repayment.

• Loan structure generally in accordance with policy.

• If secured, loan collateral coverage is marginal.

To be classified as less than satisfactory, only one of the following criteria must be met.

5. SPECIAL MENTION – Criticized

Credit constitutes an undue and unwarranted credit risk but not to the point of justifying a classification of substandard. The credit risk may be relatively minor yet constitutes an unwarranted risk in light of the circumstances surrounding a specific loan:

• Downward trend in sales, profit levels, and margins.

• Impaired working capital position.

• Cash flow is strained in order to meet debt repayment.

• Loan delinquency (30-60 days) and overdrafts may occur.

• Shrinking equity cushion.

• Diminishing primary source of repayment and questionable secondary source.

• Management abilities are questionable.

• Weak industry conditions.

• Litigation pending against the borrower.

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• Loan may need to be restructured to improve collateral position or reduce payments.

• Collateral or guaranty offers limited protection.

• Negative debt service coverage, however the credit is well collateralized and payments are current.

6. SUBSTANDARD – Classified

Credit is inadequately protected by the current net worth and paying capacity of the borrower or of the collateral pledged. There is a distinct possibility we will implement collection procedures if the loan deficiencies are not corrected. Any commercial loan placed in nonaccrual status will be rated "7" or worse. In addition, the following characteristics may apply:

• Sustained losses have severely eroded the equity and cash flow.

• Deteriorating liquidity.

• Serious management problems or internal fraud.

• Original repayment terms liberalized.

• Likelihood of bankruptcy.

• Inability to access other funding sources.

• Reliance on secondary source of repayment.

• Litigation filed against borrower.

• Interest non-accrual may be warranted.

• Collateral provides little or no value.

• Requires excessive attention of the loan officer.

• Borrower is uncooperative with loan officer.

7.VULNERABLE – Classified

Credit is considered “Substandard” and warrants placing in nonaccrual status. Risk of loss is being evaluated and exit strategy options are under review. Other characteristics that may apply:

• Insufficient cash flow to service debt.

• Minimal or no payments being received.

• Limited options available to avoid the collection process.

• Transition status, expect action will take place to collect loan without immediate progress being made.

8. DOUBTFUL – Workout

Credit has all the weaknesses inherent in a “Substandard” loan with the added characteristic that collection and/or liquidation is pending. The possibility of a loss is extremely high, but its classification as a loss is deferred until liquidation procedures are completed, or reasonably estimable. Other characteristics that may apply:

• Normal operations are severely diminished or have ceased.

• Seriously impaired cash flow.

• Original repayment terms materially altered.

• Secondary source of repayment is inadequate.

• Survivability as a “going concern” is impossible.

• Collection process has begun.

• Bankruptcy petition has been filed.

• Judgments have been filed.

• Portion of the loan balance has been charged-off.

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9. LOSS – Charge-off

Credit is considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification is for charged-off loans but does not mean that the asset has absolutely no recovery or salvage value. These loans are further characterized by:

• Liquidation or reorganization under Bankruptcy, with poor prospects of collection.

• Fraudulently overstated assets and/or earnings.

• Collateral has marginal or no value.

• Debtor cannot be located.

• Over 120 days delinquent.

Our primary credit quality indicator for residential real estate and consumer loans is the individual loan’s past due aging. The following tables summarize the past due and current loans as of December 31:

	2018
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	60	$	—	$	—	$	334	$	394	$	497,293	$	497,687
Commercial other	277		628		—		1,423		2,328		147,721		150,049
Advances to mortgage brokers	—		—		—		—		—		11,793		11,793
Total commercial	337		628		—		1,757		2,722		656,807		659,529
Agricultural
Agricultural real estate	428		—		—		2,716		3,144		84,176		87,320
Agricultural other	—		—		—		2,233		2,233		37,608		39,841
Total agricultural	428		—		—		4,949		5,377		121,784		127,161
Residential real estate
Senior liens	2,254		203		113		554		3,124		233,438		236,562
Junior liens	2		6		—		—		8		6,001		6,009
Home equity lines of credit	76		—		—		—		76		32,696		32,772
Total residential real estate	2,332		209		113		554		3,208		272,135		275,343
Consumer
Secured	95		—		—		—		95		62,721		62,816
Unsecured	10		—		—		—		10		3,848		3,858
Total consumer	105		—		—		—		105		66,569		66,674
Total	$	3,202	$	837	$	113	$	7,260	$	11,412	$	1,117,295	$	1,128,707

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	2017
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	295	$	325	$	54	$	729	$	1,403	$	480,251	$	481,654
Commercial other	1,069		28		18		—		1,115		139,909		141,024
Advances to mortgage brokers	—		—		—		—		—		12,081		12,081
Total commercial	1,364		353		72		729		2,518		632,241		634,759
Agricultural
Agricultural real estate	84		190		—		1,531		1,805		86,360		88,165
Agricultural other	39		—		104		419		562		39,542		40,104
Total agricultural	123		190		104		1,950		2,367		125,902		128,269
Residential real estate
Senior liens	3,718		234		132		325		4,409		225,007		229,416
Junior liens	69		10		—		23		102		6,812		6,914
Home equity lines of credit	293		—		77		—		370		35,668		36,038
Total residential real estate	4,080		244		209		348		4,881		267,487		272,368
Consumer
Secured	37		10		10		—		57		52,005		52,062
Unsecured	13		—		—		—		13		4,048		4,061
Total consumer	50		10		10		—		70		56,053		56,123
Total	$	5,617	$	797	$	395	$	3,027	$	9,836	$	1,081,683	$	1,091,519

Impaired Loans

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance (in whole or in part);

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis for commercial and agricultural loans by comparing the loan’s outstanding balance to the present value of expected future cash flows discounted at the loan’s effective interest rate, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. Large groups of smaller-balance, homogeneous residential real estate and consumer loans are collectively evaluated for impairment by comparing the loan’s unpaid principal balance to the present value of expected future cash flows discounted at the loan’s effective interest rate.

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We do not recognize interest income on impaired loans in nonaccrual status. For impaired loans not classified as nonaccrual, interest income is recognized daily, as earned, according to the terms of the loan agreement and the principal amount outstanding. The following summarizes information pertaining to impaired loans as of, and for the years ended, December 31:

	2018
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	3,969	$	4,211	$	437	$	4,589	$	129
Commercial other	12		12		6		1,040		55
Agricultural real estate	392		392		112		606		50
Agricultural other	44		44		20		168		46
Residential real estate senior liens	6,834		7,289		1,361		7,545		126
Residential real estate junior liens	12		12		2		25		—
Home equity lines of credit	—		—		—		—		—
Total impaired loans with a valuation allowance	11,263		11,960		1,938		13,973		406
Impaired loans without a valuation allowance
Commercial real estate	2,794		2,947				2,728		74
Commercial other	3,124		3,231				1,533		43
Agricultural real estate	7,618		7,618				7,559		585
Agricultural other	6,244		6,287				4,636		279
Home equity lines of credit	47		347				64		5
Consumer secured	9		9				12		—
Total impaired loans without a valuation allowance	19,836		20,439				16,532		986
Impaired loans
Commercial	9,899		10,401		443		9,890		301
Agricultural	14,298		14,341		132		12,969		960
Residential real estate	6,893		7,648		1,363		7,634		131
Consumer	9		9		—		12		—
Total impaired loans	$	31,099	$	32,399	$	1,938	$	30,505	$	1,392

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	2017
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	4,089	$	4,378	$	626	$	4,608	$	277
Commercial other	995		995		24		1,427		93
Agricultural real estate	—		—		—		—		—
Agricultural other	—		—		—		17		—
Residential real estate senior liens	7,816		8,459		1,473		8,296		323
Residential real estate junior liens	44		44		7		71		2
Home equity lines of credit	—		—		—		23		—
Total impaired loans with a valuation allowance	12,944		13,876		2,130		14,442		695
Impaired loans without a valuation allowance
Commercial real estate	1,791		1,865				1,585		111
Commercial other	1,224		1,224				246		23
Agricultural real estate	7,913		7,913				6,421		307
Agricultural other	2,685		2,685				2,494		126
Home equity lines of credit	79		379				106		19
Consumer secured	17		17				21		—
Total impaired loans without a valuation allowance	13,709		14,083				10,873		586
Impaired loans
Commercial	8,099		8,462		650		7,866		504
Agricultural	10,598		10,598		—		8,932		433
Residential real estate	7,939		8,882		1,480		8,496		344
Consumer	17		17		—		21		—
Total impaired loans	$	26,653	$	27,959	$	2,130	$	25,315	$	1,281

We had committed to advance $542 and $472 in connection with impaired loans, which includes TDRs, as of December 31, 2018 and 2017, respectively.

Troubled Debt Restructurings

A loan modification is considered to be a TDR when the modification includes terms outside of normal lending practices to a borrower who is experiencing financial difficulties.

Typical concessions granted include, but are not limited to:

1. Agreeing to interest rates below prevailing market rates for debt with similar risk characteristics.

2. Extending the amortization period beyond typical lending guidelines for loans with similar risk characteristics.

3. Agreeing to an interest only payment structure and delaying principal payments.

4. Forgiving principal.

5. Forgiving accrued interest.

To determine if a borrower is experiencing financial difficulties, factors we consider include:

1. The borrower is currently in default on any of their debt.

2. The borrower would likely default on any of their debt if the concession is not granted.

3. The borrower’s cash flow is insufficient to service all of their debt if the concession is not granted.

4. The borrower has declared, or is in the process of declaring, bankruptcy.

5. The borrower is unlikely to continue as a going concern (if the entity is a business).

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The following is a summary of information pertaining to TDRs granted in the years ended December 31:

	2018					2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment
Commercial other	4	$	1,360	$	1,360	6	$	1,702	$	1,702
Agricultural other	31	6,318		6,295		15	6,092		6,092
Residential real estate
Senior liens	10	701		701		6	464		464
Junior liens	—	—		—		1	8		8
Total residential real estate	10	701		701		7	472		472
Total	45	$	8,379	$	8,356	28	$	8,266	$	8,266

The following tables summarize concessions we granted to borrowers in financial difficulty in the years ended December 31:

	2018						2017
	Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period			Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period
	Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment
Commercial other	1	$	174	3	$	1,186	—	$	—	6	$	1,702
Agricultural other	18	2,625		13	3,693		11	1,972		4	4,120
Residential real estate
Senior liens	3	203		7	498		—	—		6	464
Junior liens	—	—		—	—		1	8		—	—
Total residential real estate	3	203		7	498		1	8		6	464
Total	22	$	3,002	23	$	5,377	12	$	1,980	16	$	6,286

We did not restructure any loans by forgiving principal or accrued interest during 2018 or 2017.

Based on our historical loss experience, losses associated with TDRs are not significantly different than other impaired loans within the same loan segment. As such, TDRs, including TDRs that have been modified in the past 12 months that subsequently defaulted, are analyzed in the same manner as other impaired loans within their respective loan segment.

We had no loans that defaulted in the years ended December 31, 2018 and 2017, which were modified within 12 months prior to the default date.

The following is a summary of TDR loan balances as of December 31:

	2018		2017
TDRs	$	26,951	$	26,197

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Note 5 – Premises and Equipment

A summary of premises and equipment at December 31 follows:

	2018		2017
Land	$	6,336	$	6,336
Buildings and improvements	30,100		29,661
Furniture and equipment	34,825		33,466
Total	71,261		69,463
Less: accumulated depreciation	43,446		41,013
Premises and equipment, net	$	27,815	$	28,450

Depreciation expense amounted to $2,940, $2,902, and $2,821 in 2018, 2017, and 2016, respectively.

Note 6 – Goodwill and Other Intangible Assets

The carrying amount of goodwill was $48,282 at December 31, 2018 and 2017.

Identifiable intangible assets were as follows as of December 31:

	2018
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,410	$	169

	2017
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,314	$	265

Amortization expense associated with identifiable intangible assets was $96, $119, and $162 in 2018, 2017, and 2016, respectively.

Estimated amortization expense associated with identifiable intangibles for each of the next five years succeeding December 31, 2018, and thereafter is as follows:

	Estimated Amortization Expense
2019	$	71
2020	48
2021	29
2022	15
2023	2
Thereafter	4
Total	$	169

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Note 7 – Deposits

Scheduled maturities of time deposits for the next five years, and thereafter, are as follows:

	Scheduled Maturities of Time Deposits
2019	$	232,349
2020	56,051
2021	65,036
2022	41,502
2023	31,714
Thereafter	6,968
Total	$	433,620

Interest expense on time deposits greater than $250 was $1,280 in 2018, $825 in 2017 and $678 in 2016.

Note 8 – Borrowed Funds

Borrowed funds consist of the following obligations at December 31:

	2018				2017
	Amount		Rate		Amount		Rate
FHLB advances	$	300,000	2.20	%	$	290,000	1.94	%
Securities sold under agreements to repurchase without stated maturity dates	40,299		0.11	%	54,878		0.12	%
Total	$	340,299	1.95	%	$	344,878	1.65	%

FHLB advances are collateralized by a blanket lien on all qualified 1-4 family residential real estate loans, specific AFS securities, and FHLB stock.

The following table lists the maturities and weighted average interest rates of FHLB advances as of December 31:

	2018				2017
	Amount		Rate		Amount		Rate
Fixed rate due 2018	$	—	—	%	$	70,000	1.96	%
Fixed rate due 2019	100,000		1.94	%	85,000		1.87	%
Fixed rate due 2020	55,000		2.18	%	35,000		1.80	%
Fixed rate due 2021	50,000		1.91	%	50,000		1.91	%
Variable rate due 2021 (1)	10,000		2.93	%	10,000		1.72	%
Fixed rate due 2022	20,000		1.97	%	20,000		1.97	%
Fixed rate due 2023	35,000		3.17	%	10,000		3.90	%
Fixed rate due 2024	20,000		2.96	%	—		—	%
Fixed rate due 2026	10,000		1.17	%	10,000		1.17	%
Total	$	300,000	2.20	%	$	290,000	1.94	%

⁽¹⁾ Hedged advance (see "Derivative Instruments" section below)

Securities sold under agreements to repurchase are classified as secured borrowings and are reflected at the amount of cash received in connection with the transaction. The securities underlying the agreements have a carrying value and a fair value of $40,316 and $54,898 at December 31, 2018 and 2017, respectively. Such securities remain under our control. We may be required to provide additional collateral based on the fair value of underlying securities.

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Securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount Window advances generally mature within one to four days from the transaction date. The following tables provide a summary of securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount advances at December 31:

	2018						2017
	Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period		Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period
Securities sold under agreements to repurchase without stated maturity dates	$	63,133	$	38,036	0.10	%	$	58,464	$	55,206	0.13	%
Federal funds purchased	16,200		3,741		1.78	%	5,965		2,726		1.15	%
FRB Discount Window	—		—		—	%	—		43		1.54	%

We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at December 31:

	2018		2017
Pledged to secure borrowed funds	$	431,430	$	410,988
Pledged to secure repurchase agreements	40,316		54,898
Pledged for public deposits and for other purposes necessary or required by law	58,107		27,976
Total	$	529,853	$	493,862

AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at December 31:

	2018		2017
States and political subdivisions	$	23,268	$	7,332
Mortgage-backed securities	10,736		13,199
Collateralized mortgage obligations	6,312		34,367
Total	$	40,316	$	54,898

AFS securities pledged to repurchase agreements are monitored to ensure the appropriate level is collateralized. In the event of maturities, calls, significant principal repayments, or significant decline in market values, we have an adequate level of AFS securities available to pledge to satisfy required collateral.

As of December 31, 2018, we had the ability to borrow up to an additional $150,162, based on assets pledged as collateral. We had no investment securities that were restricted to be pledged for specific purposes.

Derivative Instruments

We enter into interest rate swaps to manage exposure to interest rate risk and variability in cash flows. The interest rate swaps, associated with our variable rate borrowings, are designated upon inception as cash flow hedges of forecasted interest payments. We enter into LIBOR-based interest rate swaps that involve the receipt of variable amounts in exchange for fixed rate payments, in effect converting variable rate debt to fixed rate debt.

Cash flow hedges are assessed for effectiveness using regression analysis. The effective portion of changes in fair value are recorded in OCI and subsequently reclassified into interest expense in the same period in which the related interest on the variable rate borrowings affects earnings. In the event that a portion of the changes in fair value were determined to be ineffective, the ineffective amount would be recorded in earnings.

The following tables provide information on derivatives related to variable rate borrowings as of December 31:

	2018
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	2.3	$	10,000	Other Assets	$	323

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	2017
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	3.3	$	10,000	Other Assets	$	291

Derivatives contain an element of credit risk which arises from the possibility that we will incur a loss as a result of a counterparty failing to meet its contractual obligations. Credit risk is minimized through counterparty collateral, transaction limits and monitoring procedures. We also manage dealer credit risk by entering into interest rate derivatives only with primary and highly rated counterparties, the use of ISDA master agreements, and the use of counterparty limits. We do not anticipate any losses from failure of interest rate derivative counterparties to honor their obligations.

Note 9 – Off-Balance-Sheet Activities, Commitments and Other Matters

Credit-Related Financial Instruments

We are party to credit related financial instruments with off-balance-sheet risk. These financial instruments are entered into during the normal course of business to meet the financing needs of our customers. These financial instruments, which include commitments to extend credit and standby letters of credit, involve, to varying degrees, elements of credit and IRR in excess of the amounts recognized in the consolidated balance sheets. The contract or notional amounts of these instruments reflect the extent of involvement we have in a particular class of financial instrument.

The following table summarizes our credit related financial instruments with off-balance-sheet risk as of December 31:

	2018		2017
Unfunded commitments under lines of credit	$	199,652	$	184,317
Commercial and standby letters of credit	1,723		1,622
Commitments to grant loans	13,225		24,782
Total	$	214,600	$	210,721

Unfunded commitments under lines of credit are commitments for possible future extensions of credit to existing customers. These commitments may expire without being drawn upon and do not necessarily represent future cash requirements. Advances to mortgage brokers are also included in unfunded commitments under lines of credit. The unfunded commitment is the difference between our outstanding balances and maximum outstanding aggregate amount.

Commitments to grant loans are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The amount of collateral obtained, if we deem necessary, is based on management's credit evaluation of the customer. Commitments to grant loans include residential mortgage loans that may be committed to be sold to the secondary market.

Commercial and standby letters of credit are conditional commitments we issued to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements, including commercial paper, bond financing, and similar transactions. These commitments to extend credit and letters of credit generally mature within one year. The credit risk involved in these transactions is essentially the same as that involved in extending loans to customers. We evaluate each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if we deem necessary upon the extension of credit, is based on our credit evaluation of the borrower. While we consider standby letters of credit to be guarantees, the amount of the liability related to such guarantees on the commitment date is not significant and a liability related to such guarantees is not recorded on the consolidated balance sheets.

Our exposure to credit-related loss in the event of nonperformance by the counter parties to the financial instruments for commitments to extend credit and standby letters of credit could be up to the contractual notional amount of those instruments. We use the same credit policies in deciding to make these commitments as we do for extending loans to customers. No significant losses are anticipated as a result of these commitments.

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Derivative Loan Commitments

Mortgage loan commitments are referred to as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. We enter into commitments to fund residential mortgage loans at specific times in the future, with the intention that these loans will subsequently be sold in the secondary market. A mortgage loan commitment binds us to lend funds to a potential borrower at a specified interest rate within a specified period of time, generally up to 60 days after inception of the rate lock.

Outstanding derivative loan commitments expose us to the risk that the price of the loans arising from the exercise of the loan commitment might decline from the inception of the rate lock to funding of the loan due to increases in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increase. The notional amount of undesignated interest rate lock commitments was $1,088 and $805 at December 31, 2018 and 2017, respectively.

Forward Loan Sale Commitments

To protect against the price risk inherent in derivative loan commitments, we utilize both “mandatory delivery” and “best efforts” forward loan sale commitments to mitigate the risk of potential decreases in the values of loan that would result from the exercise of the derivative loan commitments.

With a “mandatory delivery” contract, we commit to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If we fail to deliver the amount of mortgages necessary to fulfill the commitment by the specified date, we are obligated to pay a “pair-off” fee, based on then current market prices, to the investor to compensate the investor for the shortfall.

With a “best efforts” contract, we commit to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally, the price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g. on the same day the lender commits to lend funds to a potential borrower).

We expect that these forward loan sale commitments will experience changes in fair value opposite to the change in fair value of derivative loan commitments. The notional amount of undesignated forward loan sale commitments was $1,089 and $1,843 at December 31, 2018 and 2017, respectively.

The fair values of the rate lock loan commitments related to the origination of mortgage loans that will be held for sale and the forward loan sale commitments are deemed insignificant by management and, accordingly, are not recorded in our consolidated financial statements.

Other Matters

Banking regulations require us to maintain cash reserve balances in currency or deposits with the FRB. At December 31, 2018 and 2017, the reserve balances amounted to $1,220 and $1,458, respectively.

Banking regulations limit the transfer of assets in the form of dividends, loans, or advances from the Bank to the Corporation. At December 31, 2018, substantially all of the Bank’s assets were restricted from transfer to the Corporation in the form of loans or advances. Bank dividends are the principal source of funds for the Corporation. Payment of dividends without regulatory approval is limited to the current year’s retained net income plus retained net income for the preceding two years, less any required transfers to common stock. At January 1, 2019, the amount available to the Corporation for dividends from the Bank, without regulatory approval, was approximately $18,900.

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Note 10 – Minimum Regulatory Capital Requirements

The Corporation (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by the FRB and the FDIC. Failure to meet minimum capital requirements can initiate mandatory and possibly additional discretionary actions by the FRB and the FDIC that, if undertaken, could have a material effect on our financial statements. Under regulatory capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that include quantitative measures of assets, liabilities, capital, and certain off-balance-sheet items, as calculated under regulatory accounting standards. Our capital amounts and classifications are also subject to qualitative judgments by the FRB and the FDIC about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies.

Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the following table) of total capital, tier 1 capital, and common equity tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and tier 1 capital to average assets (as defined). We believe, as of December 31, 2018 and 2017, that we met all capital adequacy requirements.

The FRB has established minimum risk-based capital guidelines. Pursuant to these guidelines, a framework has been established that assigns risk weights to each category of on and off-balance-sheet items to arrive at risk adjusted total assets. Regulatory capital is divided by the risk adjusted assets with the resulting ratio compared to the minimum standard to determine whether a corporation has adequate capital. On July 2, 2013, the FRB published revised BASEL III Capital standards for banks. The final rules redefine what is included or deducted from equity capital, changes risk weighting for certain on and off-balance sheet assets, increases the minimum required equity capital to be considered well capitalized, and introduces a capital cushion buffer. The rules, which are being gradually phased in between 2015 and 2019, are not expected to have a material impact on the Corporation but will require us to hold more capital than we have historically.

Effective January 1, 2015, the minimum standard for primary, or tier 1, capital increased from 4.00% to 6.00%. The minimum standard for total capital remained at 8.00%. Also effective January 1, 2015 was the new common equity tier 1 capital ratio which had a minimum requirement of 4.50%. Beginning on January 1, 2016 the capital conservation buffer went into effect which will further increase the required levels each year through 2019.

As of December 31, 2018 and 2017, the most recent notifications from the FRB and the FDIC categorized us as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain total risk-based, Tier 1 risk-based, Common Equity Tier 1, and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since the notifications that we believe have changed our categories. Our actual capital amounts and ratios are also presented in the table.

	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2018
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	143,429	11.75	%	$	48,832	6.375	%	$	73,248	6.50	%
Consolidated	154,705		12.58	%	49,212		6.375	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	143,429		11.75	%	48,832		7.875	%	73,248		8.00	%
Consolidated	154,705		12.58	%	49,212		7.875	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	151,804		12.43	%	97,664		9.875	%	122,080		10.00	%
Consolidated	163,080		13.26	%	98,423		9.875	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	143,429		8.07	%	71,085		4.00	%	88,856		5.00	%
Consolidated	154,705		8.72	%	70,996		4.00	%	N/A		N/A

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	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	139,897	11.56	%	$	48,404	5.750	%	$	72,605	6.50	%
Consolidated	149,013		12.23	%	48,744		5.750	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	139,897		11.56	%	48,404		7.250	%	72,605		8.00	%
Consolidated	149,013		12.23	%	48,744		7.250	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	147,597		12.20	%	96,807		9.250	%	121,009		10.00	%
Consolidated	156,713		12.86	%	97,488		9.250	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	139,897		8.07	%	69,373		4.000	%	86,717		5.00	%
Consolidated	149,013		8.54	%	69,827		4.000	%	N/A		N/A

Note 11 – Computation of Earnings Per Common Share

Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan, see "Note 12 – Benefit Plans."

Earnings per common share have been computed based on the following:

	2018		2017		2016
Average number of common shares outstanding for basic calculation	7,872,077		7,841,451		7,813,739
Average potential effect of common shares in the Directors Plan (1)	200,771		192,286		185,611
Average number of common shares outstanding used to calculate diluted earnings per common share	8,072,848		8,033,737		7,999,350
Net income	$	14,021	$	13,237	$	13,799
Earnings per common share
Basic	$	1.78	$	1.69	$	1.77
Diluted	$	1.74	$	1.65	$	1.73

⁽¹⁾ Exclusive of shares held in the Rabbi Trust

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Note 12 – Benefit Plans

401(k) Plan

We have a 401(k) plan in which substantially all employees are eligible to participate. Employees may contribute up to 100% of their compensation subject to certain limits based on federal tax laws. The plan was amended in 2013 to provide a matching safe harbor contribution for all eligible employees equal to 100% of the first 5.0% of an employee's compensation contributed to the Plan during the year. Employees are 100% vested in the safe harbor matching contributions.

For 2018, 2017 and 2016, expenses attributable to the Plan were $743, $713, and $686, respectively.

Defined Benefit Pension Plan

We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. As a result of the curtailment, future salary increases are no longer considered (the projected benefit obligation is equal to the accumulated benefit obligation), and plan benefits are based on years of service and the individual employee’s five highest consecutive years of compensation out of the last ten years of service through March 1, 2007.

Changes in the projected benefit obligation and plan assets during each year, the funded status of the plan, and the net amount recognized in our consolidated balance sheets using an actuarial measurement date of December 31, are summarized as follows during the years ended December 31:

	2018			2017
Change in benefit obligation
Benefit obligation, January 1	$	11,381		$	11,448
Interest cost	388			444
Actuarial (gain) loss	(1,194		)	578
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Benefit obligation, December 31	9,412			11,381
Change in plan assets
Fair value of plan assets, January 1	9,469			9,325
Investment (loss) return	(541		)	1,033
Contributions	—			200
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Fair value of plan assets, December 31	7,765			9,469
Deficiency in funded status at December 31, included on the consolidated balance sheets in accrued interest payable and other liabilities	$	(1,647	)	$	(1,912	)

	2018			2017
Change in accrued pension benefit costs
Accrued benefit cost at January 1	$	(1,912	)	$	(2,123	)
Contributions	—			200
Net periodic benefit cost	(345		)	(412		)
Net change in unrecognized actuarial loss and prior service cost	610			423
Accrued pension benefit cost at December 31	$	(1,647	)	$	(1,912	)

We have recorded the funded status of the plan in our consolidated balance sheets. We adjust the underfunded status in a liability account to reflect the current funded status of the plan. Any gains or losses that arise during the year but are not recognized as components of net periodic benefit cost are recognized as a component of other comprehensive income (loss).

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The components of net periodic benefit cost are as follows for the years ended December 31:

	2018			2017			2016
Interest cost on benefit obligation	$	388		$	444		$	485
Expected return on plan assets	(554		)	(546		)	(560		)
Amortization of unrecognized actuarial net loss	242			279			313
Settlement loss	269			235			—
Net periodic benefit cost	$	345		$	412		$	238

During 2018, 2017 and 2016, additional settlement losses of $269, $235 and $0 were recognized in connection with lump-sum benefit distributions. Many plan participants elect to receive their retirement benefit payments in the form of lump-sum settlements. Pro rata settlement losses, which can occasionally occur as a result of these lump-sum distributions, are recognized only in years when the total of such distributions exceed the sum of the service and interest expense components of net periodic benefit cost.

Accumulated other comprehensive income at December 31, 2018 includes net unrecognized pension costs before income taxes of $3,470, of which $140 is expected to be amortized into benefit cost during 2019.

The actuarial assumptions used in determining the benefit obligation are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	4.11	%	3.48	%	3.96	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

The actuarial weighted average assumptions used in determining the net periodic pension costs are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	3.48	%	3.96	%	4.13	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

As a result of the curtailment of the Plan, there is no rate of compensation increase considered in the above assumptions.

The expected long-term rate of return is an estimate of anticipated future long-term rates of return on plan assets as measured on a market value basis. Factors considered in arriving at this assumption include:

• Historical long-term rates of return for broad asset classes.

• Actual past rates of return achieved by the plan.

• The general mix of assets held by the plan.

• The stated investment policy for the plan.

The selected rate of return is net of anticipated investment related expenses.

Pension Plan Assets

Our overall investment strategy is to moderately grow the portfolio by investing 50% of the portfolio in equity securities and 50% in fixed income securities. This strategy is designed to generate a long-term rate of return of 6.00%.  Equity securities primarily consist of the S&P 500 Index with a smaller allocation to the Small Cap and International Index.  Fixed income securities are invested in the Bond Market Index.  The Plan has appropriate assets invested in short-term investments to meet near term benefit payments.

The asset mix and the sector weighting of the investments are determined by our pension committee, which is comprised of members of our management. To manage the Plan, we retain a third party investment advisor to conduct consultations. We review the performance of the advisor at least annually.

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The fair values of our pension plan assets by asset category were as follows as of December 31:

	2018				2017
	Total		(Level 2)		Total		(Level 2)
Short-term investments	$	98	$	98	$	300	$	300
Common collective trusts
Fixed income	2,924		2,924		3,815		3,815
Equity investments	4,743		4,743		5,354		5,354
Total	$	7,765	$	7,765	$	9,469	$	9,469

The following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used at December 31, 2018 and 2017:

• Short-term investments: Shares of a money market portfolio valued at amortized cost, which approximates fair value.

• Common collective trusts: These investments are public investment securities valued using the NAV provided by a third party investment advisor. The NAV is quoted on a private market that is not active; however, the unit price is based on underlying investments which are traded on an active market.

We anticipate contributions to the Plan in 2019 to approximate net contribution costs.

The components of projected net periodic benefit cost are as follows for the year ending:

	December 31, 2019
Interest cost on projected benefit obligation	$	378
Expected return on plan assets	(452		)
Amortization of unrecognized actuarial net loss	214
Net periodic benefit cost	$	140

Estimated future benefit payments are as follows for the next ten years:

	Estimated Benefit Payments
2019	$	450
2020	486
2021	479
2022	481
2023	481
2024 - 2028	2,540

Directors Plan

Pursuant to the terms of the Directors Plan, our directors are required to invest at least 25% of their board fees in our common stock. These stock investments can be made either through deferred fees or through the purchase of shares through the Dividend Reinvestment Plan. Deferred fees, under the Directors Plan, are converted on a quarterly basis into stock units of our common stock based on the fair value of a share of our common stock as of the relevant valuation date. Stock units credited to a participant’s account are eligible for stock and cash dividends as declared. Dividend Reinvestment Plan shares are purchased pursuant to the Dividend Reinvestment Plan.

Distribution of deferred fees from the Directors Plan occurs when the participant retires from the Board or upon the occurrence of certain other events. The participant is eligible to receive a distribution in the form of shares of our common stock of all of the stock units that are then in his or her account, and any unconverted cash will be converted to and rounded up to whole shares of stock and distributed, as well. The Directors Plan does not allow for cash settlement, and therefore, such share-based payment awards qualify for classification as equity. We may use authorized but unissued shares or purchase shares of common stock on the open market to meet our obligations under the Directors Plan.

We maintain the Rabbi Trust to fund the Directors Plan. The Rabbi Trust is an irrevocable grantor trust to which we may contribute assets for the limited purpose of funding a nonqualified deferred compensation plan. Although we may not reach the

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assets of the Rabbi Trust for any purpose other than meeting our obligations under the Directors Plan, the assets of the Rabbi Trust remain subject to the claims of our creditors and are included in the consolidated financial statements. We may contribute cash or common stock to the Rabbi Trust from time-to-time for the sole purpose of funding the Directors Plan. The Rabbi Trust will use any cash that we contributed to purchase shares of our common stock on the open market through our Investment and Trust Services department. Shares held in the Rabbi Trust are included in the calculation of earnings per share.

The components of shares eligible to be issued under the Directors Plan were as follows as of December 31:

	2018			2017
	Eligible Shares	Market Value		Eligible Shares	Market Value
Unissued	203,498	$	4,591	195,140	$	5,513
Shares held in Rabbi Trust	16,673	376		31,769	897
Total	220,171	$	4,967	226,909	$	6,410

Stock Award Incentive Plan

We maintain an equity incentive plan for the purpose of promoting growth and profitability, as well as attracting and retaining executive officers of outstanding competence, through ownership of equity. Stock may be granted to specified individuals subject to certain conditions, and transfer of shares granted under the plan is restricted. Expenses related to this plan for 2018, 2017 and 2016 were $45, $38, and $70, respectively.

Other Employee Benefit Plans

We maintain nonqualified defined contribution retirement plans to provide supplemental retirement benefits to specified participants. Expenses related to these programs for 2018, 2017 and 2016 were $356, $473, and $440, respectively. Expenses are recognized over the participants’ expected years of service.

We maintained a non-leveraged ESOP which was frozen to new participants on December 31, 2006. Contributions to the plan were discretionary and were approved by the Board of Directors and recorded as compensation expense. We made no contributions to the ESOP in 2018, 2017 and 2016. Compensation costs related to the plan for 2018, 2017 and 2016 were $21, $23, and $33, respectively. Total allocated shares outstanding related to the ESOP at December 31, 2018, 2017, and 2016 were 0, 166,833, and 204,669, respectively. Such shares are included in the computation of dividends and earnings per share in each of the respective years. On December 21, 2016, the Board approved the termination of the ESOP effective December 31, 2016. Actual dissolution of the ESOP occurred in 2018.

We maintain a self-funded medical plan under which we are responsible for the first $75 per year of claims made by a covered family. Expenses are accrued based on estimates of the aggregate liability for claims incurred and our experience. Expenses were $2,695 in 2018, $2,324 in 2017 and $2,150 in 2016.

Note 13 – Revenue

Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities, earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of investment and trust advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation.

We record receivables when revenue is unpaid and collectability is reasonably assured. Accounts receivable balances primarily represent amounts due from customers for which revenue has been recognized. Accounts receivable balances are recorded in the consolidated balance sheets in accrued interest receivable and other assets. For the years ended December 31, 2018, 2017 and 2016 we satisfied our performance obligations pursuant to contracts with customers. As a result, we have not recorded any contract assets or liabilities. We estimate no returns or allowances for the years ended December 31, 2018, 2017 and 2016.

Our contracts with customers define our performance obligations with clearly established pricing which did not require us to allocate or disaggregate revenue by performance obligation. A summary of revenue recognized for each major category of

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contracts with customers, subject to ASC 606, is as follows for the years ended December 31:

	2018		2017		2016
Debit card income	$	2,487	$	2,435	$	2,131
Trust service fees	2,134		1,928		2,089
Investment advisory fees	702		679		616
Service charges and fees related to deposit accounts	332		343		349
Total	$	5,655	$	5,385	$	5,185

A large portion of our revenue consists of interest income which is not subject to the requirements set forth in ASC 606. This recently adopted guidance required us to review our other noninterest revenue sources within the scope of the guidance to ensure appropriate recognition of revenue from contracts with customers. This review process did not identify significant changes related to revenue recognition. As such, we did not record or disclose transactions related to the adoption of this guidance.

Note 14 – Other Noninterest Expenses

A summary of expenses included in other noninterest expenses is as follows for the years ended December 31:

	2018		2017		2016
Audit, consulting, and legal fees	$	2,263	$	2,043	$	1,952
ATM and debit card fees	1,036		1,181		887
Loan underwriting fees	1,016		556		535
Director fees	858		856		851
FDIC insurance premiums	726		642		719
Donations and community relations	710		657		582
Marketing costs	596		568		586
OTTI on AFS securities	—		—		770
All other	3,558		3,541		3,343
Total other	$	10,763	$	10,044	$	10,225

Note 15 – Federal Income Taxes

Components of the consolidated provision for federal income taxes are as follows for the years ended December 31:

	2018		2017		2016
Currently payable	$	1,088	$	180	$	2,630
Deferred expense (benefit)	275		2,836		(282		)
Income tax expense	$	1,363	$	3,016	$	2,348

In 2017 we implemented tax strategies which resulted in changes to our federal income tax components, as illustrated above. These strategies, which were primarily related to premises and equipment, significantly decreased our taxes currently payable and led to an increase in our level of alternative minimum tax. Changes in these deferred tax components are displayed in the deferred tax assets and liabilities table on the following page.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21% and eliminated the corporate alternative minimum tax which can be carried forward and used to reduce future income tax. The tax law provided for a wide array of changes, only some of which had a direct impact on our federal income tax expense. Some of these changes included, but are not limited to, the following items: limits to the deduction for net interest expense; immediate expense (for tax purposes) for certain qualified depreciable assets; elimination or reduction of certain deductions related to meals and entertainment expenses; and limits to the deductibility of deposit insurance premiums.

In accordance with ASC 740, Income Taxes, the effect of income tax law changes on deferred taxes are recognized as a component of income tax expense related to continuing operations in the period in which the law was enacted. As such, federal income tax expense for the year ended December 31, 2017 reflects the effect of the tax rate change on net deferred tax assets and liabilities. This requirement also applies to items initially recognized in other comprehensive income. In January 2018,

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FASB issued ASU 2018-02 which allowed for the "stranded" tax effects in AOCI to be reclassified to retained earnings rather than income tax expense. We early adopted this guidance and applied this accounting alternative in our consolidated statements of changes in shareholders equity as of December 31, 2017.

The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense is as follows for the year ended December 31:

	2018			2017			2016
Income taxes at statutory rate (21% in 2018 and 34% in 2017 and 2016)	$	3,231		$	5,526		$	5,490
Effect of nontaxable income
Interest income on tax exempt municipal securities	(1,106		)	(1,889		)	(1,938		)
Earnings on corporate owned life insurance policies	(148		)	(247		)	(419		)
Deferred tax adjustment resulting from the statutory rate reduction pursuant to the Tax Act	—			319			—
Other	231			34			(154		)
Total effect of nontaxable income	(1,023		)	(1,783		)	(2,511		)
Effect of nondeductible expenses	113			149			143
Effect of tax credits	(958		)	(876		)	(774		)
Federal income tax expense	$	1,363		$	3,016		$	2,348

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for federal income tax purposes. Significant components of our deferred tax assets and liabilities, measured at the 21% statutory rate, included in other assets in the accompanying consolidated balance sheets, are as follows as of December 31:

	2018		2017
Deferred tax assets
Allowance for loan losses	$	1,304	$	1,076
Deferred directors’ fees	1,667		1,758
Employee benefit plans	81		70
Core deposit premium and acquisition expenses	752		733
Net unrecognized actuarial losses on pension plan	729		857
Net unrealized losses on available-for-sale securities	1,211		—
Life insurance death benefit payable	497		497
Alternative minimum tax	710		1,463
Other	716		607
Total deferred tax assets	7,667		7,061
Deferred tax liabilities
Prepaid pension cost	383		455
Premises and equipment	1,548		1,728
Accretion on securities	41		40
Core deposit premium and acquisition expenses	946		909
Net unrealized gains on available-for-sale securities	—		204
Net unrealized gains on derivative instruments	68		61
Other	1,696		1,684
Total deferred tax liabilities	4,682		5,081
Net deferred tax assets	$	2,985	$	1,980

We are subject to U.S. federal income tax; however, we are no longer subject to examination by taxing authorities for years before 2015. There are no material uncertain tax positions requiring recognition in our consolidated financial statements. We do not expect the total amount of unrecognized tax benefits to significantly increase in the next twelve months.

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We recognize interest and/or penalties related to income tax matters in income tax expense. We do not have any amounts accrued for interest and penalties at December 31, 2018 and 2017 and we are not aware of any claims for such amounts by federal income tax authorities.

Note 16 – Accumulated Other Comprehensive Income (Loss)

AOCI includes net income as well as unrealized gains and losses, net of tax, on AFS securities and derivative instruments, as well as changes in the funded status of our defined benefit pension plan. Unrealized gains and losses and changes in the funded status of the pension plan, net of tax, are excluded from net income, and are reflected as a direct charge or credit to shareholders’ equity. Comprehensive income (loss) and the related components are disclosed in the consolidated statements of comprehensive income.

The following table provides a roll-forward of the changes in AOCI by component for the years ended December 31, 2016, 2017 and 2018 (net of tax):

	Unrealized Holding Gains (Losses) on AFS Securities			Unrealized Gains (Losses) on Derivative Instruments			Change in Unrecognized Pension Cost on Defined Benefit Pension Plan			Total
Balance, January 1, 2016	$	3,536		$	—		$	(3,315	)	$	221
OCI before reclassifications	(5,865		)	248			282			(5,335		)
Amounts reclassified from AOCI	525			—			238			763
Subtotal	(5,340		)	248			520			(4,572		)
Tax effect	1,834			(84		)	(177		)	1,573
OCI, net of tax	(3,506		)	164			343			(2,999		)
Balance, December 31, 2016	30			164			(2,972		)	(2,778		)
OCI before reclassifications	289			43			11			343
Amounts reclassified from AOCI	(142		)	—			412			270
Subtotal	147			43			423			613
Tax effect	89			(15		)	(144		)	(70		)
OCI, net of tax	236			28			279			543
One-time non-cash tax rate adjustment due to the Tax Act	125			38			(530		)	(367		)
Balance, December 31, 2017	391			230			(3,223		)	(2,602		)
OCI before reclassifications	(7,229		)	33			265			(6,931		)
Amounts reclassified from AOCI	—			—			345			345
Subtotal	(7,229		)	33			610			(6,586		)
Tax effect	1,415			(7		)	(128		)	1,280
OCI, net of tax	(5,814		)	26			482			(5,306		)
Adoption of ASU 2016-01	223			—			—			223
Balance, December 31, 2018	$	(5,200	)	$	256		$	(2,741	)	$	(7,685	)

Included in OCI for the year ended December 31, 2018 are changes in unrealized holding gains and losses related to auction rate money market preferred stocks. These investments, for federal income tax purposes, have no deferred federal income taxes related to unrealized holding gains or losses given the nature of the investments.

In accordance with the Tax Act, the effect of income tax law changes on deferred taxes also applies to items recognized in other comprehensive income. In January 2018, FASB issued ASU 2018-02 which allowed for the "stranded" tax effects in AOCI to be reclassified to retained earnings rather than income tax expense. We early adopted this guidance and applied this accounting alternative in our consolidated statements of changes in shareholders equity as of December 31, 2017.

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A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the years ended December 31:

	2018									2017								2016
	Auction Rate Money Market Preferred Stocks			All Other AFS Securities			Total			Auction Rate Money Market Preferred Stocks		All Other AFS Securities			Total			Auction Rate Money Market Preferred and Preferred Stocks		All Other AFS securities			Total
Unrealized gains (losses) arising during the period	$	(495	)	$	(6,734	)	$	(7,229	)	$	407	$	(118	)	$	289		$	54	$	(5,919	)	$	(5,865	)
Reclassification adjustment for net (gains) losses included in net income	—			—			—			—		(142		)	(142		)	—		(245		)	(245		)
Reclassification adjustment for impairment loss included in net income	—			—			—			—		—			—			—		770			770
Net unrealized gains (losses)	(495		)	(6,734		)	(7,229		)	407		(260		)	147			54		(5,394		)	(5,340		)
Tax effect (1)	—			1,415			1,415			—		89			89			—		1,834			1,834
Unrealized gains (losses), net of tax	$	(495	)	$	(5,319	)	$	(5,814	)	$	407	$	(171	)	$	236		$	54	$	(3,560	)	$	(3,506	)

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

The following table details reclassification adjustments and the related affected line items in our consolidated statements of income for the years ended December 31:

Details about AOCI components	Amount Reclassified from AOCI							Affected Line Item in the Consolidated Statements of Income
	2018		2017		2016
Unrealized holding gains (losses) on AFS securities
	$	—	$	142	$	245		Net gains on sale of AFS securities
	—		—		(770		)	Other noninterest expenses
	—		142		(525		)	Income before federal income tax expense
	—		48		(179		)	Federal income tax expense (benefit) (1)
	$	—	$	94	$	(346	)	Net income
Change in unrecognized pension cost on defined benefit pension plan
	$	345	$	412	$	238		Other noninterest expenses
	72		140		81			Federal income tax expense (1)
	$	273	$	272	$	157		Net income

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

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Note 17 – Fair Value

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.

Following is a description of the valuation methodologies, key inputs, and an indication of the level of the fair value hierarchy in which the assets or liabilities are classified.

AFS securities:AFS securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. Level 2 fair value measurement is based upon quoted prices for similar instruments. If quoted prices are not available, fair values are measured using independent pricing models or other model based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss and liquidity assumptions. The values for Level 1 and Level 2 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources.

Equity securities, at fair value: Equity securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. The values for Level 1 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources.

Loans: We do not record loans at fair value on a recurring basis. However, from time-to-time, loans are classified as impaired and a specific allowance for loan losses may be established. Loans for which it is probable that payment of interest and principal will be significantly different than the contractual terms of the original loan agreement are considered impaired. Once a loan is identified as impaired, we measure the estimated impairment. The fair value of impaired loans is estimated using one of several methods, including the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less costs to sell, if the loan is collateral dependent. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans.

We review the net realizable values of the underlying collateral for collateral dependent impaired loans on at least a quarterly basis for all loan types.  To determine the collateral value, we utilize independent appraisals, broker price opinions, or internal evaluations.  We review these valuations to determine whether an additional discount should be applied given the age of market information that may have been considered as well as other factors such as costs to sell an asset if it is determined that the collateral will be liquidated in connection with the ultimate settlement of the loan. We use these valuations to determine if any specific reserves or charge-offs are necessary. We may obtain new valuations in certain circumstances, including when there has been significant deterioration in the condition of the collateral, if the foreclosure process has begun, or if the existing valuation is deemed to be outdated.

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The following tables list the quantitative fair value information about impaired loans as of:

	December 31, 2018
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 40%
		Cash crop inventory	30% - 40%
Discounted value	$20,045	Livestock	30%
		Other inventory	45% - 50%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

	December 31, 2017
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 35%
		Cash crop inventory	30% - 40%
Discounted value	$15,956	Livestock	30%
		Other inventory	50% - 75%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

Collateral discount rates may have ranges to accommodate differences in the age of the independent appraisal, broker price opinion, or internal evaluation.

Derivative instruments: Derivative instruments, consisting solely of interest rate swaps, are recorded at fair value on a recurring basis. Derivatives qualifying as cash flow hedges, when highly effective, are reported at fair value in other assets or other liabilities on our Consolidated Balance Sheets with changes in value recorded in OCI. Should the hedge no longer be considered effective, the ineffective portion of the change in fair value is recorded directly in earnings in the period in which the change occurs. The fair value of a derivative is determined by quoted market prices and model-based valuation techniques. As such, we classify derivative instruments as Level 2.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement.

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Estimated Fair Values of Financial Instruments Not Recorded at Fair Value in their Entirety on a Recurring Basis

Disclosure of the estimated fair values of financial instruments, which differs from carrying values, often requires the use of estimates. In cases where quoted market values in an active market are not available, we use present value techniques and other valuation methods to estimate the fair values of our financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used.

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis were as follows as of December 31:

	2018
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	73,471	$	73,471	$	73,471	$	—	$	—
Mortgage loans AFS	358		365		—		365		—
Gross loans	1,128,707		1,099,645		—		—		1,099,645
Less allowance for loan and lease losses	8,375		8,375		—		—		8,375
Net loans	1,120,332		1,091,270		—		—		1,091,270
Accrued interest receivable	6,928		6,928		6,928		—		—
Equity securities without readily determinable fair values (1)	24,948		N/A		—		—		—
OMSR	2,434		2,602		—		2,602		—
LIABILITIES
Deposits without stated maturities	859,073		859,073		859,073		—		—
Deposits with stated maturities	433,620		425,993		—		425,993		—
Borrowed funds	340,299		333,829		—		333,829		—
Accrued interest payable	826		826		826		—		—

	2017
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	30,848	$	30,848	$	30,848	$	—	$	—
Mortgage loans AFS	1,560		1,587		—		1,587		—
Gross loans	1,091,519		1,056,906		—		—		1,056,906
Less allowance for loan and lease losses	7,700		7,700		—		—		7,700
Net loans	1,083,819		1,049,206		—		—		1,049,206
Accrued interest receivable	7,063		7,063		7,063		—		—
Equity securities without readily determinable fair values (1)	23,454		N/A		—		—		—
OMSR	2,409		2,409		—		2,409		—
LIABILITIES
Deposits without stated maturities	811,992		811,992		811,992		—		—
Deposits with stated maturities	453,266		443,892		—		443,892		—
Borrowed funds	344,878		342,089		—		342,089		—
Accrued interest payable	680		680		680		—		—

⁽¹⁾ Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment.

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Financial Instruments Recorded at Fair Value

The table below presents the recorded amount of assets and liabilities measured at fair value on December 31:

	2018											2017
	Total		Level 1			Level 2			Level 3			Total		Level 1			Level 2			Level 3
Recurring items
AFS securities
Government-sponsored enterprises	$	170	$	—		$	170		$	—		$	216	$	—		$	216		$	—
States and political subdivisions	190,866		—			190,866			—			208,474		—			208,474			—
Auction rate money market preferred	2,554		—			2,554			—			3,049		—			3,049			—
Mortgage-backed securities	184,484		—			184,484			—			208,797		—			208,797			—
Collateralized mortgage obligations	116,760		—			116,760			—			128,194		—			128,194			—
Total AFS securities	494,834		—			494,834			—			548,730		—			548,730			—
Equity securities	—		—			—			—			3,577		3,577			—			—
Derivative instruments	323		—			323			—			291		—			291			—
Nonrecurring items
Impaired loans (net of the ALLL)	20,045		—			—			20,045			15,956		—			—			15,956
Total	$	515,202	$	—		$	495,157		$	20,045		$	568,554	$	3,577		$	549,021		$	15,956
Percent of assets and liabilities measured at fair value			—		%	96.11		%	3.89		%			0.63		%	96.56		%	2.81		%

Equity securities are recorded at fair value with changes in fair value recognized through earnings on a recurring basis. For the year ended December 31, 2018, we recorded a loss of $41 through earnings. We had no other assets or liabilities recorded at fair value with changes in fair value recognized through earnings, on a recurring basis or nonrecurring basis, as of December 31, 2018.

Note 18 – Related Party Transactions

In the ordinary course of business, we grant loans to principal officers and directors and their affiliates (including their families and companies in which they have 10% or more ownership). Annual activity consisted of the following for the years ended December 31:

	2018			2017
Balance, January 1	$	4,335		$	3,946
New loans	1,184			3,895
Repayments	(2,176		)	(3,506		)
Balance, December 31	$	3,343		$	4,335

Total deposits of these principal officers and directors and their affiliates amounted to $5,029 and $5,671 at December 31, 2018 and 2017, respectively. In addition, the ESOP held deposits with the Bank aggregating $266 at December 31, 2017. No deposits were held as of December 31, 2018 due to the dissolution of the ESOP during 2018.

From time-to-time, we make charitable donations to The Isabella Bank Foundation (the “Foundation”), which is a non-controlled nonprofit organization formed for the purpose of distributing charitable donations to recipient organizations generally located in the communities we serve. Our donations are expensed when committed to the Foundation. The assets and transactions of the Foundation are not included in our consolidated financial statements.

Assets of the Foundation include cash and cash equivalents, certificates of deposit, and shares of Isabella Bank Corporation common stock. The Foundation owned 44,350 shares of our common stock as of December 31, 2018 and 2017, respectively. Such shares are included in the computation of dividends and earnings per share.

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We did not make donations to the Foundation for the years ended December 31, 2018, 2017 and 2016. The following table displays total asset balances of the Foundation as of December 31:

	2018		2017		2016
Total assets	$	1,731	$	2,162	$	2,213

Note 19 – Operating Segments

Our reportable segments are based on legal entities that account for at least 10% of net operating results. The operations of the Bank as of December 31, 2018, 2017, and 2016 represent approximately 90% or more of our consolidated total assets and operating results. As such, no additional segment reporting is presented.

Note 20 – Parent Company Only Financial Information

Condensed Balance Sheets

	December 31
	2018		2017
ASSETS
Cash on deposit at the Bank	$	2,499	$	185
Investments in subsidiaries	143,942		145,962
Premises and equipment	1,912		1,950
Other assets	51,674		52,253
TOTAL ASSETS	$	200,027	$	200,350
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other liabilities	$	4,508	$	5,445
Shareholders' equity	195,519		194,905
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	200,027	$	200,350

Condensed Statements of Income

	Year Ended December 31
	2018		2017		2016
Income
Dividends from subsidiaries	$	13,100	$	9,600	$	7,400
Interest income	1		2		14
Management fee and other	3,030		6,463		6,574
Total income	16,131		16,065		13,988
Expenses
Compensation and benefits	4,132		5,196		4,898
Occupancy and equipment	513		1,779		1,696
Audit and related fees	368		527		536
Other	1,615		2,566		2,120
Total expenses	6,628		10,068		9,250
Income before income tax benefit and equity in undistributed earnings of subsidiaries	9,503		5,997		4,738
Federal income tax benefit	749		91		1,058
Income before equity in undistributed earnings of subsidiaries	10,252		6,088		5,796
Undistributed earnings of subsidiaries	3,769		7,149		8,003
Net income	$	14,021	$	13,237	$	13,799

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Condensed Statements of Cash Flows

	Year Ended December 31
	2018			2017			2016
Operating activities
Net income	$	14,021		$	13,237		$	13,799
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries	(3,769		)	(7,149		)	(8,003		)
Undistributed earnings of equity securities without readily determinable fair values	(144		)	40			791
Share-based payment awards under equity compensation plan	612			640			573
Depreciation	134			154			156
Deferred income tax expense (benefit)	(31		)	792			147
Changes in operating assets and liabilities which provided (used) cash
Other assets	1,237			42			(44		)
Accrued interest and other liabilities	(937		)	(1,590		)	(2,669		)
Net cash provided by (used in) operating activities	11,123			6,166			4,750
Investing activities
Maturities, calls, principal payments, and sales of AFS securities	—			249			—
Sales (purchases) of premises and equipment	(96		)	(113		)	(133		)
Net cash provided by (used in) investing activities	(96		)	136			(133		)
Financing activities
Net increase (decrease) in borrowed funds	—			—			—
Cash dividends paid on common stock	(8,169		)	(7,990		)	(7,645		)
Proceeds from the issuance of common stock	6,864			6,177			5,023
Common stock repurchased	(7,007		)	(5,181		)	(4,440		)
Common stock purchased for deferred compensation obligations	(401		)	(420		)	(383		)
Net cash provided by (used in) financing activities	(8,713		)	(7,414		)	(7,445		)
Increase (decrease) in cash and cash equivalents	2,314			(1,112		)	(2,828		)
Cash and cash equivalents at beginning of period	185			1,297			4,125
Cash and cash equivalents at end of period	$	2,499		$	185		$	1,297

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Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

DISCLOSURE CONTROLS AND PROCEDURES

We carried out an evaluation, under the supervision and with the participation of the Principal Executive Officer and Principal Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15(d)-15(e) under the Exchange Act) as of December 31, 2018, pursuant to Exchange Act Rule 13a-15. Based upon that evaluation, the Principal Executive Officer and Principal Financial Officer concluded that our disclosure controls and procedures as of December 31, 2018, were effective to ensure that information required to be disclosed in reports that we file or submit under the Exchange Act are recorded, processed, summarized and reported within the time periods specified in SEC rules and forms.

CHANGES IN INTERNAL CONTROL OVER FINANCIAL REPORTING

We also conducted an evaluation of internal control over financial reporting to determine whether any changes occurred during the quarter ended December 31, 2018, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. Based on this evaluation, we have concluded that there have been no such changes during the quarter ended December 31, 2018.

Management’s Report on Internal Control Over Financial Reporting

We are responsible for the preparation and integrity of our published consolidated financial statements. The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America and, accordingly, include amounts based on judgments and estimates. We also prepared the other information included in the Annual Report on Form 10-K and are responsible for the accuracy and consistency with the consolidated financial statements.

We are responsible for establishing and maintaining a system of internal control over financial reporting, which is intended to provide reasonable assurance to our management and Board of Directors regarding the reliability of our consolidated financial statements. The system includes but is not limited to:

• A documented organizational structure and division of responsibility;

• Established policies and procedures, including a code of conduct to foster a strong ethical climate which is communicated throughout our Corporation;

• Internal auditors that monitor the operation of the internal control system and report findings and recommendations to management and the Audit Committee;

• Procedures for taking action in response to an internal audit finding or recommendation;

• Regular reviews of our consolidated financial statements by qualified individuals; and

• The careful selection, training and development of our people.

There are inherent limitations in the effectiveness of any system of internal control, including the possibility of human error and the circumvention or overriding of controls. Also, the effectiveness of an internal control system may change over time. We have implemented a system of internal control that was designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of consolidated financial statements for external purposes in accordance with generally accepted accounting principles.

We have assessed our internal control system in relation to criteria for effective internal control over financial reporting described in “Internal Control-Integrated Framework” issued by the Committee of Sponsoring Organizations (2013 framework) of the Treadway Commission.

Based upon these criteria, we believe that, as of December 31, 2018, our system of internal control over financial reporting was effective.

Our independent registered public accounting firm, Rehmann Robson LLC ("Rehmann"), has audited our 2018consolidated financial statements and our internal control over financial reporting as of December 31, 2018. Rehmann was given unrestricted access to all financial records and related data, including minutes of all meetings of stockholders, the Board of Directors and committees of the Board. Rehmann has issued an unqualified audit opinion on our 2018consolidated financial

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statements as a result of the integrated audit and an unqualified opinion on the effectiveness of our internal controls as of December 31, 2018.

Isabella Bank Corporation

By:

/s/ Jae A. Evans

Jae A. Evans

President, Chief Executive Officer

(Principal Executive Officer)

March 13, 2019

/s/ Neil M. McDonnell

Neil M. McDonnell

Chief Financial Officer

(Principal Financial Officer)

March 13, 2019

Item 9B. Other Information.

None.

88

PART III

Item 10. Directors, Executive Officers and Corporate Governance.

For information concerning our directors and certain executive officers, see “Election of Directors” and “Section 16(a) Beneficial Ownership Reporting Compliance” in our Proxy Statement for the Annual Meeting of Shareholders to be held May 7, 2019 (“Proxy Statement”) which is incorporated herein by reference.

For Information concerning our Audit Committee financial experts, see “Committees of the Board of Directors and Meeting Attendance” in the Proxy Statement which is incorporated herein by reference.

We have adopted a Code of Business Conduct and Ethics that applies to our Chief Executive Officer and Chief Financial Officer. We shall provide to any person without charge upon request, a copy of our Code of Business Conduct and Ethics. Written requests should be sent to: Secretary, Isabella Bank Corporation, 401 North Main Street, Mount Pleasant, Michigan 48858.

Item 11. Executive Compensation.

For information concerning executive compensation, see “Executive Officers,” “Compensation Committee Report,” “Compensation Committee Interlocks and Insider Participation,” “Compensation Discussion and Analysis,” and “Remuneration of Directors” in the Proxy Statement which is incorporated herein by reference.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

For information concerning the security ownership of certain owners and management, see “Security Ownership of Certain Beneficial Owners and Management” in the Proxy Statement which is incorporated herein by reference.

Equity Compensation Plan Information

The following table provides information as of December 31, 2018, with respect to compensation plans under which our common shares are authorized for issuance to directors, officers or employees in exchange for consideration in the form of goods or services.

Plan Category	Number of Securities to be Issued Upon Exercise of Outstanding Options, Warrants, and Rights (A)		Weighted Average Exercise Price of Outstanding Options, Warrants, and Rights (B)		Number of  Securities Remaining Available for Future Issuance Under Equity Compensation Plans (Excluding Securities Reflected in Column (A)) (C)
Equity compensation plans approved by shareholders:
None	—		—		—
Equity compensation plans not approved by shareholders:
Deferred director compensation plan (1)	203,498	(3)	—	(5)	—	(6)
Stock Award Incentive Plan (2)	4,122	(4)	—	(5)	—	(6)
Total	207,620

⁽¹⁾Pursuant to the terms of the Directors Plan, our directors are required to invest at least 25% of their board fees in our common stock. These stock investments can be made either through deferred fees or through the purchase of shares through the Dividend Reinvestment Plan. Deferred fees, under the Directors Plan, are converted on a quarterly basis into stock units of our common stock based on the fair value of a share of our common stock as of the relevant valuation date. Stock units credited to a participant’s account are eligible for stock and cash dividends as declared. Dividend Reinvestment Plan shares are purchased pursuant to the Dividend Reinvestment Plan.

Distribution of deferred fees from the Directors Plan occurs when the participant retires from the Board or upon the occurrence of certain other events. The participant is eligible to receive a distribution in the form of shares of our common stock of all of the stock units that are then in his or her account, and any unconverted cash will be converted to and rounded up to whole shares of stock and distributed, as well. The Directors Plan does not allow for cash settlement, and therefore, such share-based payment awards qualify for classification as equity. We may use authorized but unissued shares or purchase shares of common stock on the open market to meet our obligations under the Directors Plan.

⁽²⁾ The Stock Award Incentive Plan is an equity-based bonus plan. Under the plan, we may award stock bonuses to the President and CEO, CFO and Bank President. The plan authorizes the issuance of vested stock to eligible employees worth up to 10% of the employee’s annualized base wages, on a calendar year basis. The plan imposes several conditions on the

89

issuance of stock awards and therefore, the stock awards are restricted. Awards are converted to shares upon payment to the participant based on the market value of our common stock on the date of award.

⁽³⁾ As of December 31, 2018, the Directors Plan had 220,171 shares eligible to be distributed under the Directors Plan. The Rabbi Trust holds 16,673 shares for the benefit of participants pursuant to the Directors Plan.  Accordingly, such shares are not included in the number of securities issuable in column (A).

⁽⁴⁾ This amount includes shares subject to outstanding incentive awards at the maximum amount of shares issuable under such awards.  However, payout of incentive awards is contingent on the individual and the Corporation reaching certain levels of performance during 2018.  If the performance criteria for these awards are not fully satisfied, the award recipient will receive less than the maximum number of shares eligible under these grants and may receive nothing from these grants. Additionally, this amount assumes the closing price of our common stock as of December 31, 2018 for purposes of the conversion from awards to stock.

⁽⁵⁾ The Directors Plan and the Stock Award Incentive Plan do not have an exercise price.

⁽⁶⁾ There is no maximum number of shares available for issuance under the Directors Plan and the Stock Award Incentive Plan.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

For information, see “Indebtedness of and Transactions with Management” and “Election of Directors” in the Proxy Statement, which is incorporated herein by reference.

Item 14. Principal Accountant Fees and Services.

For information concerning our principal accountant fees and services see “Fees for Professional Services Provided by Rehmann Robson LLC” and “Pre-approval Policies and Procedures” in our Proxy Statement which is incorporated herein by reference.

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PART IV

Item 15. Exhibits and Financial Statement Schedules.

(a)	(1)	Financial Statements:  The following documents are filed as part of Item 8 of this report:
		Report of Independent Registered Public Accounting Firm
		Consolidated Balance Sheets
		Consolidated Statements of Changes in Shareholders’ Equity
		Consolidated Statements of Income
		Consolidated Statements of Comprehensive Income (Loss)
		Consolidated Statements of Cash Flows
		Notes to Consolidated Financial Statements
	(2)	Financial Statement Schedules: All schedules are omitted because they are neither applicable nor required, or because the required information is included in the consolidated financial statements or related notes.
	(3)	See the exhibits listed below under Item 15(b):
(b)	The following exhibits required by Item 601 of Regulation S-K are filed as part of this report:
	3(a)	Amended Articles of Incorporation (1)
	3(b)	Amendment to the Articles of Incorporation (2)
	3(c)	Amendment to the Articles of Incorporation (3)
	3(d)	Amendment to the Articles of Incorporation (4)
	3(e)	Amendment to the Articles of Incorporation (8)
	3(f)	Amended Bylaws (6)
	3(g)	Amendment to Bylaws (7)
	3(h)	Amendment to Bylaws (10)
	3(i)	Amendment to Bylaws (11)
	10(a)	Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors* (9)
	10(b)	Isabella Bank Corporation Split Dollar Plan* (13)
	10(c)	Isabella Bank Corporation Retirement Bonus Plan* (12)
	10(d)	Isabella Bank Corporation Supplemental Executive Retirement Plan* (14)
	10(e)	Amendment to the Isabella Bank Corporation Supplemental Executive Retirement Plan* (15)
	10(f)	Isabella Bank Corporation Stock Award Incentive Plan* (15)
	14	Code of Business Conduct and Ethics (5)
	21	Subsidiaries of the Registrant
	23	Consent of Rehmann Robson LLC, Independent Registered Public Accounting Firm
	31(a)	Certification pursuant to section 302 of the Sarbanes-Oxley Act of 2002 by the Chief Executive Officer
	31(b)	Certification pursuant to section 302 of the Sarbanes-Oxley Act of 2002 by the Chief Financial Officer
	32	Section 1350 Certification of Chief Executive Officer and Chief Financial Officer
	101.INS	XBRL Interactive Data File**
	101.SCH	XBRL Interactive Data File**
	101.CAL	XBRL Interactive Data File**
	101.LAB	XBRL Interactive Data File**
	101.PRE	XBRL Interactive Data File**
	101.DEF	XBRL Interactive Data File**

91

*	Management Contract or Compensatory Plan or Arrangement.
**	As provided by Rule 406T in Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Exchange Act
(1)	Previously filed as an Exhibit to the Isabella Bank Corporation Form 10-K, filed March 12, 1991, and incorporated herein by reference
(2)	Previously filed as an Exhibit to the Isabella Bank Corporation Form 10-K, filed March 26, 1994, and incorporated herein by reference.
(3)	Previously filed as an Exhibit to Isabella Bank Corporation Form 10-K, filed March 22, 2000, and incorporated herein by reference.
(4)	Previously filed as an Exhibit to Isabella Bank Corporation Form 10-K, filed March 27, 2001, and incorporated herein by reference.
(5)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed April 25, 2006, and incorporated herein by reference.
(6)	Previously filed as an Exhibit to Isabella Bank Corporation Form 10-K, filed March 16, 2005, and incorporated herein by reference.
(7)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed November 22, 2006, and incorporated herein by reference.
(8)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed May 16, 2008, and incorporated herein by reference.
(9)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed March 13, 2019, and incorporated herein by reference.
(10)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed August 28, 2009, and incorporated herein by reference.
(11)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed December 23, 2009, and incorporated herein by reference.
(12)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed December 19, 2008, and incorporated herein by reference.
(13)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed March 31, 2015, and incorporated herein by reference.
(14)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed April 27, 2015, and incorporated herein by reference.
(15)	Previously filed as an Exhibit to Isabella Bank Corporation Form 8-K, filed February 12, 2019, and incorporated herein by reference.

Item 16. Form 10-K Summary.

Not applicable.

92

SIGNATURES

Pursuant to the requirements of Section 16 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

ISABELLA BANK CORPORATION

(Registrant)

By:	/s/ Jae A. Evans	Date:	March 13, 2019
	Jae A. Evans
	President, Chief Executive Officer
	(Principal Executive Officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

93

Signatures	Capacity	Date
/s/ Dr. Jeffrey J. Barnes	Director	March 13, 2019
Dr. Jeffrey J. Barnes
/s/ Jill Bourland	Director	March 13, 2019
Jill Bourland
/s/ Jae A. Evans	President, Chief Executive Officer (Principal Executive Officer), and Director	March 13, 2019
Jae A. Evans
/s/ G. Charles Hubscher	Director	March 13, 2019
G. Charles Hubscher
/s/ Thomas L. Kleinhardt	Director	March 13, 2019
Thomas L. Kleinhardt
/s/ Joseph LaFramboise	Director	March 13, 2019
Joseph LaFramboise
/s/ David J. Maness	Director	March 13, 2019
David J. Maness
/s/ W. Joseph Manifold	Director	March 13, 2019
W. Joseph Manifold
/s/ Neil M. McDonnell	Chief Financial Officer (Principal Financial Officer)	March 13, 2019
Neil M. McDonnell
/s/ W. Michael McGuire	Director	March 13, 2019
W. Michael McGuire
/s/ Sarah R. Opperman	Director	March 13, 2019
Sarah R. Opperman
/s/ Jerome Schwind	Isabella Bank President and Director	March 13, 2019
Jerome Schwind
/s/ Rhonda S. Tudor	Controller	March 13, 2019
Rhonda S. Tudor
/s/ Gregory V. Varner	Director	March 13, 2019
Gregory V. Varner

94

EX-21

Exhibit 21

Subsidiaries of Isabella Bank Corporation:

Isabella Bank

Wholly owned

EX-23

Exhibit 23

Consent of Independent Registered Public Accounting Firm

We hereby consent to the incorporation by reference in the registration statements (Form S-3No. 333-226638 and Form S-8No. 333-228953) pertaining to the Isabella Bank Corporation Stockholder Dividend Reinvestment and Employee Stock Purchase Plan of our integrated audit report dated March 13, 2019, relating to the consolidated financial statements and the effectiveness of internal control over financial reporting of Isabella Bank Corporation, included in this Annual Report on Form 10-K for the year ended December 31, 2018.

	/s/ Rehmann Robson LLC
Saginaw, Michigan
March 13, 2019

EX-31.A

Exhibit 31(a)

I, Jae A. Evans, certify that:

1. I have reviewed this Annual Report on Form 10-K of Isabella Bank Corporation (the “registrant”).

2. Based on my knowledge, this Annual Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Annual Report.

3. Based on my knowledge, the financial statements, and other financial information included in this Annual Report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this Annual Report.

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under my supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this Annual Report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under my supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors:

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	March 13, 2019	/s/ Jae A. Evans
		President, Chief Executive Officer
		(Principal Executive Officer)

EX-31.B

Exhibit 31(b)

I, Neil M. McDonnell, certify that:

1. I have reviewed this Annual Report on Form 10-K of Isabella Bank Corporation (the “registrant”).

2. Based on my knowledge, this Annual Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Annual Report.

3. Based on my knowledge, the financial statements, and other financial information included in this Annual Report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this Annual Report.

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under my supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this Annual Report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under my supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of registrant’s board of directors:

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	March 13, 2019	/s/ Neil M. McDonnell
		Chief Financial Officer
		(Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Isabella Bank Corporation (the “Corporation”) on Form 10-K for the year ended December 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Jae A. Evans, President and Chief Executive Officer and Neil M. McDonnell, Chief Financial Officer of the Corporation, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Corporation.

/s/ Jae A. Evans

President, Chief Executive Officer

(Principal Executive Officer)

March 13, 2019

/s/ Neil M. McDonnell

Chief Financial Officer

(Principal Financial Officer)

March 13, 2019

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Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 11, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	ISABELLA BANK CORP
Entity Central Index Key	0000842517
Document Type	10-K
Document Period End Date	Dec. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		7,873,337
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 211,421,000

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Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Cash and cash equivalents
Cash and demand deposits due from banks	$ 23,534	$ 25,267
Interest bearing balances due from banks	49,937	5,581
Total cash and cash equivalents	73,471	30,848
Debt Securities, Available-for-sale	494,834	548,730
AFS securities (amortized cost of $572,087 in 2014 and $517,614 in 2013)	494,834	548,730
Available-for-sale Securities, Equity Securities	0	3,577
Mortgage loans AFS	358	1,560
Loans
Commercial	659,529	634,759
Agricultural	127,161	128,269
Residential real estate	275,343	272,368
Consumer	66,674	56,123
Gross loans	1,128,707	1,091,519
Less allowance for loan losses	8,375	7,700
Net loans	1,120,332	1,083,819
Premises and equipment	27,815	28,450
Corporate owned life insurance	27,733	27,026
Accrued interest receivable	6,928	7,063
Equity securities without readily determinable fair values	24,948	23,454
Goodwill and other intangible assets	48,451	48,547
Other assets	12,437	10,056
TOTAL ASSETS	1,837,307	1,813,130
Deposits
Noninterest bearing	236,534	237,511
NOW accounts	235,287	231,666
Certificates of deposit under $100 and other savings	744,944	728,090
Time Deposits, at or Above FDIC Insurance Limit	75,928	67,991
Total deposits	1,292,693	1,265,258
Borrowed funds	340,299	344,878
Accrued interest payable and other liabilities	8,796	8,089
Total liabilities	1,641,788	1,618,225
Shareholders' equity
Common stock — no par value 15,000,000 shares authorized; issued and outstanding 7,741,530 shares (including 10,579 shares held in the Rabbi Trust) in 2014 and 7,723,023 shares (including 12,761 shares held in the Rabbi Trust) in 2013	140,416	140,277
Shares to be issued for deferred compensation obligations	5,431	5,502
Retained earnings	57,357	51,728
Accumulated other comprehensive income loss	(7,685)	(2,602)
Total shareholders' equity	195,519	194,905
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 1,837,307	$ 1,813,130

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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Available-for-sale securities, amortized cost	$ 501,245	$ 547,912
Common stock, shares authorized	15,000,000	15,000,000
Common stock, shares issued	7,870,969	7,857,293
Common stock, shares outstanding	7,870,969	7,857,293

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Consolidated Statements of Changes in Shareholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Shares to be Issued for Deferred Compensation Obligations	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balances at Dec. 31, 2015	$ 183,971	$ 139,198	$ 4,592	$ 39,960	$ 221
Beginning balances, shares at Dec. 31, 2015		7,799,867
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	10,800			13,799	(2,999)
Issuance of common stock	5,023	$ 5,023
Issuance of common stock, shares		179,903
Common stock issued for deferred compensation obligations	0	$ 0	0
Common stock issued for deferred compensation obligations, shares		0
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	0	$ 127	(127)
Share based payment awards under equity compensation plan	573		573
Common stock purchased for deferred compensation obligations	(383)	(383)
Common stock repurchased pursuant to publicly announced repurchase plan	(4,440)	$ (4,440)
Common stock repurchased pursuant to publicly announced repurchase plan, shares		(158,701)
Cash dividends	(7,645)			(7,645)
Ending balances at Dec. 31, 2016	187,899	$ 139,525	5,038	46,114	(2,778)
Ending balances, shares at Dec. 31, 2016		7,821,069
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	13,780			13,237	543
Tax Cuts and Jobs Act Reclassification to Retained Earnings	(367)			367	(367)
Issuance of common stock	6,177	$ 6,177
Issuance of common stock, shares		220,510
Common stock issued for deferred compensation obligations	0	$ 0	0
Common stock issued for deferred compensation obligations, shares		0
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	0	$ 176	(176)
Share based payment awards under equity compensation plan	640		640
Common stock purchased for deferred compensation obligations	(420)	(420)
Common stock repurchased pursuant to publicly announced repurchase plan	(5,181)	$ (5,181)
Common stock repurchased pursuant to publicly announced repurchase plan, shares		(184,286)
Cash dividends	(7,990)			(7,990)
Ending balances at Dec. 31, 2017	$ 194,905	$ 140,277	5,502	51,728	(2,602)
Ending balances, shares at Dec. 31, 2017	7,857,293	7,857,293
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	$ 8,715			14,021	(5,306)
Issuance of common stock	6,864	$ 6,864
Issuance of common stock, shares		261,693
Common stock issued for deferred compensation obligations	0	$ 0	0
Common stock issued for deferred compensation obligations, shares		0
Common stock transferred from the Rabbi Trust to satisfy deferred compensation obligations	0	$ 683	(683)
Share based payment awards under equity compensation plan	612		612
Common stock purchased for deferred compensation obligations	(401)	(401)
Common stock repurchased pursuant to publicly announced repurchase plan	(7,007)	$ (7,007)
Common stock repurchased pursuant to publicly announced repurchase plan, shares		(248,017)
Cash dividends	(8,169)			(8,169)
Ending balances at Dec. 31, 2018	$ 195,519	$ 140,416	$ 5,431	57,357	(7,685)
Ending balances, shares at Dec. 31, 2018	7,870,969	7,870,969
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 0			$ (223)	$ 223

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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Stockholders' Equity [Abstract]
Cash dividends per share (in dollars per share)	$ 1.04	$ 1.02	$ 0.98

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Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income
Loans, including fees	$ 49,229	$ 43,537	$ 38,537
AFS securities
Taxable	8,239	8,410	8,591
Nontaxable	5,279	5,570	5,715
Federal funds sold and other	1,117	896	823
Total interest income	63,864	58,413	53,666
Interest expense
Deposits	9,261	6,809	5,836
Borrowings	6,370	5,685	5,029
Total interest expense	15,631	12,494	10,865
Net interest income	48,233	45,919	42,801
Provision for loan losses	978	253	(135)
Net interest income after provision for loan losses	47,255	45,666	42,936
Noninterest income
Service charges and fees	6,210	6,013	5,230
Net gain on sale of mortgage loans	525	647	651
Earnings on corporate owned life insurance policies	707	726	761
Debt Securities, Realized Gain (Loss)	0	142	245
Other	3,504	3,284	4,221
Total noninterest income	10,946	10,812	11,108
Noninterest expenses
Compensation and benefits	22,609	21,525	19,170
Furniture and equipment	6,182	5,523	5,275
Occupancy	3,263	3,133	3,227
Net AFS securities impairment loss	0	0	770
Other	10,763	10,044	10,225
Total noninterest expenses	42,817	40,225	37,897
Income before federal income tax expense	15,384	16,253	16,147
Federal income tax expense	1,363	3,016	2,348
NET INCOME	$ 14,021	$ 13,237	$ 13,799
Earnings per share
Basic (in dollars per share)	$ 1.78	$ 1.69	$ 1.77
Diluted (in dollars per share)	1.74	1.65	1.73
Cash dividends per basic share (in dollars per share)	$ 1.04	$ 1.02	$ 0.98

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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income		$ 14,021	$ 13,237	$ 13,799
Unrealized gains (losses) on AFS securities
Unrealized gains (losses) arising during the period		(7,229)	289	(5,865)
Reclassification adjustment for net realized (gains) losses included in net income		0	(142)	(245)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		0	0	770
Comprehensive income (loss) before income tax (expense) benefit		(7,229)	147	(5,340)
Tax effect	[1]	1,415	89	1,834
Unrealized gains (losses), net of tax		(5,814)	236	(3,506)
Unrealized Gain (Loss) on Derivatives and Commodity Contracts [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax, Portion Attributable to Parent		33	43	248
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Portion Attributable to Parent		(7)	(15)	(84)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Parent		26	28	164
Change in unrecognized pension cost on defined benefit pension plan
Change in unrecognized pension cost arising during the year		265	11	282
Reclassification adjustment for net periodic benefit cost included in net income		345	412	238
Net change in unrecognized actuarial loss and prior service cost		610	423	520
Tax effect		(128)	(144)	(177)
Change in unrealized pension cost, net of tax		482	279	343
Other comprehensive income (loss), net of tax		(5,306)	543	(2,999)
Comprehensive income (loss)		$ 8,715	$ 13,780	$ 10,800

[1] (1) See “Note 16 – Accumulated Other Comprehensive Income (Loss)” in the accompanying notes to consolidated financial statements for tax effect reconcilia

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
OPERATING ACTIVITIES
Debt Securities, Realized Gain (Loss)	$ 0	$ 142	$ 245
Unrealized Gain (Loss) on Securities	41	0	0
Net income	14,021	13,237	13,799
Reconciliation of net income to net cash provided by operating activities:
Undistributed Earnings Of Equity Method And Other Investments	(144)	40	791
Provision for loan losses	978	253	(135)
Impairment of foreclosed assets	0	2	10
Depreciation	2,940	2,902	2,821
Amortization of OMSR	218	340	394
Amortization of acquisition intangibles	96	119	162
Net amortization of AFS securities	1,873	2,144	2,747
AFS securities impairment loss	0	0	770
Equity Securities, FV-NI, Realized Gain (Loss)	(1)	0	0
Net gain on sale of mortgage loans	(525)	(647)	(651)
Increase in cash value of corporate owned life insurance policies	(707)	(726)	(761)
Bank Owned Life Insurance Income, From Policy Redemption	0	0	(469)
Share-based payment awards under equity compensation plan	612	640	573
Deferred income tax expense (benefit)	275	2,836	(282)
Origination of loans held for sale	(29,242)	(36,276)	(33,089)
Proceeds from loan sales	30,969	37,179	33,111
Net changes in operating assets and liabilities which provided (used) cash:
Accrued interest receivable	135	(483)	(311)
Other assets	113	800	455
Accrued interest payable and other liabilities	358	(2,497)	550
Net cash provided by (used in) operating activities	22,010	19,721	20,240
Activity in AFS securities
Sales	0	12,827	35,664
Maturities, calls, and principal payments	80,005	97,617	137,278
Purchases	(35,211)	(106,510)	(79,514)
Proceeds from Sale of Available-for-sale Securities, Equity	3,537	0	0
Loan principal (originations) collections, net	(37,958)	(81,188)	(160,294)
Proceeds from sales of foreclosed assets	403	269	486
Purchases of premises and equipment	(2,305)	(2,038)	(3,804)
Proceeds from the redemption of corporate owned life insurance policies	0	0	1,353
Payments to Acquire Federal Home Loan Bank Stock	(1,350)	(1,800)	(200)
Payments to Acquire Other Investments	(651)	(932)	(878)
Net cash provided by (used in) investing activities	6,470	(81,755)	(69,909)
FINANCING ACTIVITIES
Net increase (decrease) in deposits	27,435	70,218	30,477
Net increase (decrease) in borrowed funds	(4,579)	7,184	27,962
Cash dividends paid on common stock	(8,169)	(7,990)	(7,645)
Proceeds from issuance of common stock	6,864	6,177	5,023
Common stock repurchased	(7,007)	(5,181)	(4,440)
Common stock purchased for deferred compensation obligations	(401)	(420)	(383)
Net cash provided by (used in) financing activities	14,143	69,988	50,994
Increase (decrease) in cash and cash equivalents	42,623	7,954	1,325
Cash and cash equivalents at beginning of period	30,848	22,894	21,569
Cash and cash equivalents at end of period	73,471	30,848	22,894
SUPPLEMENTAL CASH FLOWS INFORMATION:
Interest paid	15,485	12,388	10,836
Federal income taxes paid	50	3,120	1,415
SUPPLEMENTAL NONCASH INFORMATION:
Transfers of loans to foreclosed assets	$ 467	$ 331	$ 306

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Nature of Operations and Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Nature of Operations and Summary of Significant Accounting Policies

Nature of Operations and Summary of Significant Accounting Policies

BASIS OF PRESENTATION AND CONSOLIDATION: The consolidated financial statements include the accounts of Isabella Bank Corporation, a financial services holding company, and its wholly owned subsidiary, Isabella Bank. All intercompany balances and accounts have been eliminated in consolidation. References to “the Corporation”, “Isabella”, “we”, “our”, “us”, and similar terms refer to the consolidated entity consisting of Isabella Bank Corporation and its subsidiary. References to Isabella Bank or the “Bank” refers to Isabella Bank Corporation’s subsidiary, Isabella Bank.

For additional information, see “Note 18 – Related Party Transactions.”

NATURE OF OPERATIONS: Isabella Bank Corporation is a financial services holding company offering a wide array of financial products and services in several mid-Michigan counties. Our banking subsidiary, Isabella Bank, offers banking services through 30 locations, 24 hour banking services locally and nationally through shared automatic teller machines, 24 hour online banking, mobile banking, and direct deposits to businesses, institutions, individuals and their families. Lending services offered include commercial loans, agricultural loans, residential real estate loans, and consumer loans. Deposit services include interest and noninterest bearing checking accounts, savings accounts, money market accounts, certificates of deposit, direct deposits, cash management services, mobile and internet banking, electronic bill pay services, and automated teller machines. Other related financial products include trust and investment services, safe deposit box rentals, and credit life insurance. Active competition, principally from other commercial banks, savings and loan associations, mortgage brokers, finance companies, credit unions, and retail brokerage firms exists in all of our principal markets. Our results of operations can be significantly affected by changes in interest rates, changes in the local economic environment and changes in regulations.

USE OF ESTIMATES: In preparing consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, we make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheet and reported amounts of revenues and expenses during the reporting year. Actual results could differ from those estimates.

Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the ALLL, the fair value of AFS investment securities, and the valuation of goodwill and other intangible assets.

FAIR VALUE MEASUREMENTS: Fair value refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data. We may choose to measure eligible items at fair value at specified election dates.

For assets and liabilities recorded at fair value, it is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements for those financial instruments for which there is an active market. In cases where the market for a financial asset or liability is not active, we include appropriate risk adjustments that market participants would make for nonperformance and liquidity risks when developing fair value measurements. Fair value measurements for assets and liabilities for which limited or no observable market data exists are accordingly based primarily upon estimates, are often calculated based on the economic and competitive environment, the characteristics of the asset or liability and other factors. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values.

We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Investment securities AFS and derivative instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as mortgage loans AFS, impaired loans, foreclosed assets, OMSR, goodwill, and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write downs of individual assets.

Fair Value Hierarchy

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

For further discussion of fair value considerations, refer to “Note 17 – Fair Value.”

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK: Most of our activities are conducted with customers located within the central Michigan area. A significant amount of our outstanding loans are secured by commercial and residential real estate. Other than these types of loans, there is no significant concentration to any other industry or any one customer.

CASH AND CASH EQUIVALENTS: For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash and balances due from banks, federal funds sold, and other deposit accounts. Generally, federal funds sold are for a one day period. We maintain deposit accounts in various financial institutions which generally exceed federally insured limits or are not insured. We do not believe we are exposed to any significant interest, credit or other financial risk as a result of these deposits.

AFS SECURITIES: Purchases of investment securities are generally classified as AFS. However, we may elect to classify securities as either held to maturity or trading. Securities classified as AFS debt securities are recorded at fair value, with unrealized gains and losses, net of the effect of deferred income taxes, excluded from earnings and reported in other comprehensive income. Included in AFS securities are auction rate money market preferred securities. These investments, for federal income tax purposes, have no federal income tax impact given the nature of the investments. Auction rate money market preferred securities and preferred stocks are recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income. Purchase premiums and discounts are recognized in interest income using the interest method over the term of the securities. Realized gains and losses on the sale of AFS securities are determined using the specific identification method.

AFS securities are reviewed quarterly for possible OTTI. In determining whether an OTTI exists for debt securities, we assert that: (a) we do not have the intent to sell the security; and (b) it is more likely than not we will not have to sell the security before recovery of its cost basis. If these conditions are not met, we recognize an OTTI charge through earnings for the difference between the debt security’s amortized cost basis and its fair value, and such amount is included in noninterest income. For debt securities that do not meet the above criteria, and we do not expect to recover the security’s amortized cost basis, the security is considered other-than-temporarily impaired. For these debt securities, we separate the total impairment into the credit risk loss component and the amount of the loss related to market and other risk factors. In order to determine the amount of the credit loss for a debt security, we calculate the recovery value by performing a discounted cash flow analysis based on the current cash flows and future cash flows we expect to recover. The amount of the total OTTI related to the credit risk is recognized in earnings and is included in noninterest income. The amount of the total OTTI related to other risk factors is recognized as a component of other comprehensive income. For debt securities that have recognized OTTI through earnings, if through subsequent evaluation there is a significant increase in the cash flow expected, the difference between the amortized cost basis and the cash flows expected to be collected is accreted as interest income.

AFS equity securities are reviewed for OTTI at each reporting date. This evaluation considers a number of factors including, but not limited to, the length of time and extent to which the fair value has been less than cost, the financial condition and near term prospects of the issuer, and our ability and intent to hold the securities until fair value recovers. If it is determined that we do not have the ability and intent to hold the securities until recovery or that there are conditions that indicate that a security may not recover in value then the difference between the fair value and the cost of the security is recognized in earnings and is included in noninterest income.

LOANS: Loans that we have the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding principal balance adjusted for any charge-offs, the ALLL, and any deferred fees or costs on originated loans. Interest income on loans is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the appropriate yield methods.

The accrual of interest on agricultural, commercial and mortgage loans is discontinued at the time the loan is 90 days or more past due unless the credit is well secured and in the process of collection. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. For loans that are placed on nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected is charged against the ALLL. Interest income on loans in nonaccrual status is not recognized until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. For impaired loans not classified as nonaccrual, interest income continues to be accrued over the term of the loan based on the principal amount outstanding.

ALLOWANCE FOR LOAN AND LEASE LOSSES: The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when we believe the uncollectability of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.

We evaluate the ALLL on a regular basis. Our periodic review of the collectability of loans considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.

The ALLL consists of specific, general, and unallocated components. The specific component relates to loans that are deemed to be impaired. For such loans that are analyzed for specific allowance allocations, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non-impaired loans and is based on historical loss experience adjusted for current conditions. An unallocated component is maintained to cover uncertainties that we believe affect our estimate of probable losses based on qualitative factors. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance;

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment.

LOANS HELD FOR SALE: Mortgage loans held for sale on the secondary market are carried at the lower of cost or fair value as determined by aggregating outstanding commitments from investors or current investor yield requirements. Net unrealized losses, if any, would be recognized as a component of other noninterest expenses.

Mortgage loans held for sale are sold with the mortgage servicing rights retained by us. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.

TRANSFERS OF FINANCIAL ASSETS: Transfers of financial assets, including mortgage loans and participation loans, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is determined to be surrendered when 1) the assets have been legally isolated from us, 2) the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and 3) we do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Other than servicing, we have no substantive continuing involvement related to these loans.

SERVICING: Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. We have no purchased servicing rights. For sales of mortgage loans, a portion of the cost of originating the loan is allocated to the servicing right based on relative fair value. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.

Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights into tranches based on predominant risk characteristics, such as interest rate, loan type, and investor type. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranche. If we later determine that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the valuation allowance may be recorded as an increase to income. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. The unpaid principal balance of mortgages serviced for others was $259,481 and $266,789 with capitalized servicing rights of $2,435 and $2,409 at December 31, 2018 and 2017, respectively.

Servicing fee income is recorded for fees earned for servicing loans for others. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. We recorded servicing fee revenue of $651, $671, and $696 related to residential mortgage loans serviced for others during 2018, 2017, and 2016, respectively, which is included in other noninterest income.

FORECLOSED ASSETS: Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at the lower of our carrying amount or fair value less estimated selling costs at the date of transfer, establishing a new cost basis. Any write downs based on the asset’s fair value at the date of acquisition are charged to the ALLL. After foreclosure, property held for sale is carried at the lower of the new cost basis or fair value less costs to sell. Impairment losses on property to be held and used are measured at the amount by which the carrying amount of property exceeds its fair value. Costs relating to holding these assets are expensed as incurred. We periodically perform valuations and any subsequent write downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the lower of our carrying amount or fair value less costs to sell. Foreclosed assets of $355 and $291 as of December 31, 2018 and 2017, respectively, are included in other assets.

PREMISES AND EQUIPMENT: Land is carried at cost. Buildings and equipment are carried at cost, less accumulated depreciation which is computed principally by the straight-line method based upon the estimated useful lives of the related assets, which range from 3 to 40 years. Major improvements are capitalized and appropriately amortized based upon the useful lives of the related assets or the expected terms of the leases, if shorter, using the straight-line method. Maintenance, repairs and minor alterations are charged to current operations as expenditures occur. We annually review these assets to determine whether carrying values have been impaired.

EQUITY SECURITIES WITHOUT READILY DETERMINABLE FAIR VALUES: Included in equity securities without readily determinable fair values are our holdings in FHLB stock and FRB stock as well as our ownership interest in Corporate Settlement Solutions, LLC. Our investment in Corporate Settlement Solutions, LLC, a title insurance company, was made in the 1st quarter of 2008. We are not the managing entity of Corporate Settlement Solutions, LLC, and account for our investment in that entity under the equity method of accounting.

Equity securities without readily determinable fair values consist of the following holdings as of December 31:

	2018		2017
FHLB Stock	$	15,050	$	13,700
Corporate Settlement Solutions, LLC	7,565		7,421
FRB Stock	1,999		1,999
Other	334		334
Total	$	24,948	$	23,454

EQUITY COMPENSATION PLAN: At December 31, 2018, the Directors Plan had 220,171 shares eligible to be issued to participants, for which the Rabbi Trust held 16,673 shares. We had 226,909 shares to be issued at December 31, 2017, with 31,769 shares held in the Rabbi Trust. Compensation costs relating to share-based payment transactions are recognized as the services are rendered, with the cost measured based on the fair value of the equity or liability instruments issued (see “Note 12 – Benefit Plans”).

CORPORATE OWNED LIFE INSURANCE: We have purchased life insurance policies on key members of management, partially for the purpose of funding certain post-retirement benefits. In the event of death of one of these individuals, we would receive a specified cash payment equal to the face value of the policy. Such policies are recorded at their cash surrender value, or the amount that can be realized on the balance sheet date. Increases in cash surrender value in excess of single premiums paid are reported as other noninterest income.

As of December 31, 2018 and 2017, the present value of the post retirement benefits payable by us to the covered insured participants was estimated to be $2,751 and $2,751, respectively, and is included in accrued interest payable and other liabilities. The expenses associated with these policies totaled $0, $577, and $(8) for 2018, 2017, and 2016, respectively.

ACQUISITION INTANGIBLES AND GOODWILL: We previously acquired branch facilities and related deposits in business combinations accounted for as a purchase. The acquisitions included amounts related to the valuation of customer deposit relationships (core deposit intangibles). Core deposit intangibles arising from acquisitions are included in goodwill and other intangible assets are being amortized over their estimated lives and evaluated for potential impairment on at least an annual basis. Goodwill, which represents the excess of the purchase price over identifiable assets, is not amortized but is evaluated for impairment on at least an annual basis. Acquisition intangibles and goodwill are typically qualitatively evaluated to determine if it is more likely than not that the carrying balance is impaired. If it is determined that the carrying balance is more likely than not to be impaired, we perform a cash flow valuation to determine the extent of the potential impairment. This valuation method requires a significant degree of our judgment. In the event the projected undiscounted net operating cash flows for these intangible assets are less than the carrying value, the asset is recorded at fair value as determined by the valuation model.

OFF BALANCE SHEET CREDIT RELATED FINANCIAL INSTRUMENTS: In the ordinary course of business, we have entered into commitments to extend credit, including commitments under credit card arrangements, commercial lines of credit, home equity lines of credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded only when funded.

REVENUE RECOGNITION: Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities, earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of investment and trust advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation.

FEDERAL INCOME TAXES: Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax assets or liabilities are determined based on the tax effects of the temporary differences between the book and tax basis on the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. Valuation allowances are established, where necessary, to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable or refundable for the year plus or minus the change during the year in deferred tax assets and liabilities.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21%. In accordance with ASC 740, Income Taxes, the effect of income tax law changes on deferred taxes was recognized as a component of income tax expense related to continuing operations in the period in which the law was enacted. As such, federal income tax expense for the year ended December 31, 2017 reflects the effect of the tax rate change on net deferred tax assets and liabilities (see “Note 15 – Federal Income Taxes” and “Note 16 – Accumulated Other Comprehensive Income (Loss)”).

We analyze our filing positions in the jurisdictions where we are required to file income tax returns, as well as all open tax years in these jurisdictions. We also treat interest and penalties attributable to income taxes, to the extent they arise, as a component of our noninterest expenses.

DEFINED BENEFIT PENSION PLAN: We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. The service cost component of the defined benefit pension plan is included in “compensation and benefits” on the consolidated statements of income and is funded consistent with the requirements of federal laws and regulations. All other costs related to the defined benefit pension plan are included in “other” noninterest expenses on the consolidated statements of income. The current benefit obligation is included in "accrued interest payable and other liabilities" on the consolidated balance sheets. Inherent in the determination of defined benefit pension costs are assumptions concerning future events that will affect the amount and timing of required benefit payments under the plan. These assumptions include demographic assumptions such as mortality, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic benefit cost includes the interest cost based on the assumed discount rate, an expected return on plan assets based on an actuarially derived market-related value of assets, and amortization of unrecognized net actuarial gains or losses. Actuarial gains and losses result from experience different from that assumed and from changes in assumptions (excluding asset gains and losses not yet reflected in market-related value). Amortization of actuarial gains and losses is included as a component of net periodic defined benefit pension cost.

For additional information, see “Note 12 – Benefit Plans.”

MARKETING COSTS: Marketing costs are expensed as incurred (see “Note 14 – Other Noninterest Expenses”).

RECLASSIFICATIONS: Certain amounts reported in the 2017 and 2016consolidated financial statements have been reclassified to conform with the 2018 presentation.

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Pending Accounting Standards Updates

12 Months Ended

Dec. 31, 2018

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Pending Accounting Standards Updates

Accounting Standards Updates

Recently Adopted Accounting Standards Updates

ASU No. 2014-09: “Revenue from Contracts with Customers”

In May 2014, ASU No. 2014-09 was issued and created new Topic 606 to provide a common revenue standard to achieve consistency and clarification to the revenue recognition principles. The guidance outlines steps to achieve the core principle that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. These steps consist of: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when (or as) the entity satisfies a performance obligation.

The new authoritative guidance, as amended, was effective on January 1, 2018. We reviewed our contracts related to trust and investment services and those related to other noninterest income to determine if changes in income recognition were required as a result of this guidance. Implementation of this guidance did not have a significant impact on our operating results for the year ended December 31, 2018.

ASU No. 2016-01: “Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Liabilities” and ASU No. 2018-03: “Technical Corrections and Improvements to Financial Instruments - Overall (Subtopic 825-10: Recognition and Measurement of Financial Assets and Financial Liabilities”

In January 2016, ASU No. 2016-01 was issued and sets forth the following: 1) requires equity investments, with certain exceptions, to be measured at fair value with changes in fair value recognized in net income; 2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment and requiring measurement of the investment at fair value when an impairment exists; 3) for public entities, eliminates the requirement to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; 4) for public entities, requires the use of exit price notion when measuring the fair value of financial instruments for disclosure purposes; 5) requires an entity to present separately in other comprehensive income, the portion of the total change in the fair value of a liability resulting from a change in the instrument-specific credit risk when the entity has elected to measure the liability at fair value in accordance with the fair value option for financial instruments; 6) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the accompanying notes to the financial statements; and 7) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity's other deferred tax assets.

The new authoritative guidance was effective for interim and annual periods beginning after December 15, 2017. As a result of this guidance, the change in the fair value of equity investments has been recorded in net income beginning on January 1, 2018 (see “Note 17 – Fair Value”). Equity securities are now recorded separately from AFS securities at a fair value which approximates an exit price notion. Adoption of this guidance did not have a significant impact on our operations and its future impact will depend on the fair value of these investments, or any securities acquired subsequent to this guidance, at future measurement dates. The disclosures related to equity investment securities reflect a fully retrospective presentation for comparative purposes.

For discussion of the fair value measurement of financial instruments, refer to “Note 17 – Fair Value”.

In February 2018, ASU No. 2018-03 was issued and sets forth correction or improvement amendments for specific issues that may arise within the scope of ASU 2016-01. These amendments have been adopted and did not have a significant impact on our operating results or financial statement disclosures.

ASU No. 2017-08: “Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities”

In March 2017, ASU No. 2017-08 amended the amortization period for certain purchased callable debt securities held at a premium. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments in this update shorten the amortization period and require the premium to be amortized to the earliest call date. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2018 with early adoption permitted. The guidance has been adopted and did not have a significant impact on our operating results or financial statement disclosures.

ASU No. 2017-09: “Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting”

In May 2017, ASU No. 2017-09 was issued and provided guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting under Topic 718. The current disclosure requirements in Topic 718 apply regardless of whether an entity is required to apply modification accounting under the amendments in this update. An entity should account for the effects of a modification unless all of the following are met:

1. The fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the modified award is the same as the fair value (or calculated value or intrinsic value, if such an alternative measurement method is used) of the original award immediately before the original award is modified. If the modification does not affect any of the inputs to the valuation technique that the entity uses to value the award, the entity is not required to estimate the value immediately before and after the modification.

2. The vesting conditions of the modified award are the same as the vesting conditions of the original award immediately before the original award is modified.

3. The classification of the modified award as an equity instrument or a liability instrument is the same as the classification of the original award immediately before the original award is modified.

The new authoritative guidance was effective on January 1, 2018 and did not have a significant impact on our operating results or financial statement disclosures.

Pending Accounting Standards Updates

ASU No. 2016-02: “Leases (Topic 842)”

In February 2016, ASU No. 2016-02 was issued to create Topic 842 - Leases which will require recognition of lease assets and lease liabilities on the balance sheet for leases previously classified as operating leases. Accounting guidance is set forth for both lessee and lessor accounting. Under lessee accounting, a lessee should recognize in the statement of financial position a liability to make lease payments (the lease liability) and a right-of-use asset representing its right to use the underlying asset for the lease term.

For finance leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize interest on the lease liability separately from amortization of the right-of-use asset in the statement of comprehensive income; and 3) classify repayments of the principal portion of the lease liability within financing activities and payments of interest on the lease liability and variable lease payments within operating activities in the statement of cash flows. For operating leases, a lessee is required to do the following: 1) recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in the statement of financial position; 2) recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term on a generally straight-line basis; and 3) classify all cash payments within operating activities in the statement of cash flows.

The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2018. We have reviewed our lease agreements to determine the appropriate treatment under this guidance. These changes will not have a significant impact on our operating results or financial statement disclosures upon adoption.

In July 2018, ASU No. 2018-10 was issued and provided codification improvements for various leasing issues. Also during July 2018, ASU No. 2018-11 was issued for targeted improvements related to the transition of the new guidance. In December 2018, ASU No. 2018-20 was issued and provided narrow-scope improvements for lessors. These updates are effective with the implementation of ASU 2016-02.

ASU No. 2016-13: “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments”

In June 2016, ASU No. 2016-13 was issued and updated the measurement for credit losses for AFS debt securities and assets measured at amortized cost which include loans, trade receivables, and any other financial assets with the contractual right to receive cash. Current GAAP requires an “incurred loss” methodology for recognizing credit losses that delays recognition until it is probable a loss has been incurred. Under the incurred loss approach, entities are limited to a probable initial recognition threshold when credit losses are measured under GAAP; an entity generally only considers past events and current conditions in measuring the incurred loss.

Under the new guidance, the incurred loss impairment methodology in current GAAP is replaced with a methodology that reflects current expected credit losses (CECL). This methodology requires consideration of a broader range of reasonable and supportable information to calculate credit loss estimates. The measurement of expected credit losses is based on relevant information about past events, including historical experience, current conditions, and reasonable and supportable forecasts that affect the collectability of the reported amount. An entity must use judgment in determining the relevant information and estimation methods that are appropriate in its circumstances which applies to assets measured either collectively or individually.

The update allows an entity to revert to historical loss information that is reflective of the contractual term (considering the effect of prepayments) for periods that are beyond the time frame for which the entity is able to develop reasonable and supportable forecasts. In addition, the disclosures of credit quality indicators in relation to the amortized cost of financing receivables, a current disclosure requirement, are further disaggregated by year of origination (or vintage). The vintage information will be useful for financial statement users to better assess changes in underwriting standards and credit quality trends in asset portfolios over time and the effect of those changes on credit losses.

Overall, the update will allow entities the ability to measure expected credit losses without the restriction of incurred or probable losses that exist under current GAAP. For users of the financial statements, the update requires disclosure of decision-useful information about the expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019 and may have a significant impact on our operations and financial statement disclosures as well as that of the banking industry as a whole.

We have invested a considerable amount of effort toward this guidance and will continue to invest considerable effort until its effective date. A committee was formed and has developed a road map to implementation, and the committee is accountable for timely and accurate adoption of the guidance. A company that has been focused on the ALLL for more than 10 years and serves hundreds of financial institutions has been engaged to provide us with education, advisory, and software solutions exclusively related to the ACL. We expect to run parallel processes during 2019, which will help to ensure we are ready to calculate, review, and report the ACL by the required implementation date.

In November 2018, ASU No. 2018-19 was issued and provided codification improvements for two issues: transition and effective date for nonpublic business entities and operating lease receivables. The update is effective with the implementation of ASU 2016-13 and is not expected to impact our operating results or financial statement disclosures.

ASU No. 2018-13: “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement”

In August 2018, ASU No. 2018-13 was issued and provided an updated framework related to fair value disclosures. For entities required to make disclosures about recurring or nonrecurring fair value measurements, the update provides disclosure modifications which include the removal, modification and addition of specific disclosure requirements.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019 and will impact our financial statement disclosures.

ASU No. 2018-14: “Compensation - Retirement Benefits - Defined Pension Plans - General (Subtopic 715-20): Disclosure Framework - Changes to the Disclosure Requirements for Defined Benefit Plans”

In August 2018, ASU No. 2018-14 was issued and provided updated framework related to defined benefit plans. For employers that sponsor defined benefit pension or other postretirement plans, the update provides disclosure modifications which include the removal of six specific requirements, the addition of two specific requirements and clarification to existing requirements.

Disclosure additions include 1) the weighted-average interest crediting rates for cash balance plans and other plans with promised interest crediting rates; 2) an explanation of the reasons for significant gains and losses related to changes in the benefit obligation for the period. Clarification items relate to 1) the projected benefit obligation (PBO) and fair value of plan assets for plans with PBOs in excess of plan assets; and 2) the accumulated benefit obligation (ABO) and fair value of plan assets for plans with ABOs in excess of plan assets.

The new authoritative guidance is effective for fiscal years ending after December 15, 2020, with early adoption permitted, and will likely impact our financial statement disclosures.

ASU No. 2018-15: “Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract”

In August 2018, ASU No. 2018-15 was issued and provided guidance on the accounting for implementation, setup, and other upfront costs (collectively referred to as implementation costs) for entities that are a customer in a hosting arrangement that is a service contract. The guidance also provides clarification on requirements to capitalize implementation costs and the required accounting for expenses related to capitalization of implementation costs.

The new authoritative guidance is effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted. The impact on our operating results and financial statement disclosures as a result of this update will depend upon our arrangements and whether or not they meet the requirement to be capitalized.

ASU No. 2018-16: “Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate of Hedge Accounting Purposes”

In October 2018, ASU No. 2018-16 was issued and permits the OIS rate based on SOFR as a U.S. benchmark interest rate. Including the OIS rate based on SOFR as an eligible benchmark interest rate during the early stages of the marketplace transition will facilitate the LIBOR to SOFR transition and provide sufficient lead time for entities to prepare for changes to interest rate risk hedging strategies for both risk management and hedge accounting purposes.

For entities that have not already adopted ASU No. 2017-12 (“Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities”), the amendments in this update are required to be adopted concurrently with the amendments in ASU No. 2017-12. For entities that already have adopted ASU No. 2017-12, the amendments in this update are effective for interim and annual periods beginning after December 15, 2018, with early adoption permitted. The amendments in this update are not expected to have a significant impact on our operating results or financial statement disclosures.

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AFS Securities

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

AFS Securities

AFS Securities

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:

	2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	172	$	—	$	2	$	170
States and political subdivisions	188,992		2,125		251		190,866
Auction rate money market preferred	3,200		—		646		2,554
Mortgage-backed securities	189,688		76		5,280		184,484
Collateralized mortgage obligations	119,193		71		2,504		116,760
Total	$	501,245	$	2,272	$	8,683	$	494,834

	2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	217	$	—	$	1	$	216
States and political subdivisions	204,131		4,486		143		208,474
Auction rate money market preferred	3,200		—		151		3,049
Mortgage-backed securities	210,757		390		2,350		208,797
Collateralized mortgage obligations	129,607		160		1,573		128,194
Total	$	547,912	$	5,036	$	4,218	$	548,730

The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2018 are as follows:

	Maturing								Securities with Variable Monthly Payments or Noncontractual Maturities
	Due in One Year or Less		After One Year But Within Five Years		After Five Years But Within Ten Years		After Ten Years				Total
Government sponsored enterprises	$	—	$	172	$	—	$	—	$	—	$	172
States and political subdivisions	23,151		81,901		55,923		28,017		—		188,992
Auction rate money market preferred	—		—		—		—		3,200		3,200
Mortgage-backed securities	—		—		—		—		189,688		189,688
Collateralized mortgage obligations	—		—		—		—		119,193		119,193
Total amortized cost	$	23,151	$	82,073	$	55,923	$	28,017	$	312,081	$	501,245
Fair value	$	23,189	$	82,662	$	56,842	$	28,343	$	303,798	$	494,834

Expected maturities for government sponsored enterprises and states and political subdivisions may differ from contractual maturities because issuers may have the right to call or prepay obligations.

As the auction rate money market preferred investments have continual call dates, they are not reported by a specific maturity group. Because of their variable monthly payments, mortgage-backed securities and collateralized mortgage obligations are not reported by a specific maturity group.

A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table. There were no sales of AFS securities during 2018.

	2017		2016
Proceeds from sales of AFS securities	$	12,827	$	35,664
Gross realized gains (losses)	$	142	$	245
Applicable income tax expense (benefit)	$	48	$	83

The following information pertains to AFS securities with gross unrealized losses at December 31 aggregated by investment category and length of time that individual securities have been in a continuous loss position.

	2018
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	—	$	—	$	2	$	170	$	2
States and political subdivisions	83		14,732		168		15,090		251
Auction rate money market preferred	—		—		646		2,554		646
Mortgage-backed securities	896		43,485		4,384		124,253		5,280
Collateralized mortgage obligations	199		21,886		2,305		87,929		2,504
Total	$	1,178	$	80,103	$	7,505	$	229,996	$	8,683
Number of securities in an unrealized loss position:			66				102		168

	2017
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	1	$	216	$	—	$	—	$	1
States and political subdivisions	142		16,139		1		188		143
Auction rate money market preferred	—		—		151		3,049		151
Mortgage-backed securities	454		72,007		1,896		76,065		2,350
Collateralized mortgage obligations	701		76,435		872		25,308		1,573
Total	$	1,298	$	164,797	$	2,920	$	104,610	$	4,218
Number of securities in an unrealized loss position:			81				24		105

Unrealized losses on our AFS securities portfolio are the result of recent increases in intermediate-term and long-term benchmark interest rates and not credit issues.

As of December 31, 2018 and 2017, we conducted an analysis to determine whether any securities currently in an unrealized loss position should be identified as other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria:

• Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate?

• Is the investment credit rating below investment grade?

• Is it probable the issuer will be unable to pay the amount when due?

• Is it more likely than not that we will have to sell the security before recovery of its cost basis?

• Has the duration of the investment been extended?

During the fourth quarter of 2016, we identified one municipal bond as other-than-temporarily impaired. While management estimated the OTTI to be realized, we also engaged the services of an independent investment valuation firm to estimate the amount of impairment as of December 31, 2016. The valuation calculated the estimated market value utilizing two different approaches:

1) Market - Appraisal and Comparable Investments

2) Income - Discounted Cash Flow Method

The two methods were then weighted, with a higher weighting applied to the Market approach, to determine the estimated impairment. As a result of this analysis, we reduced the carrying value to $230 which required us to recognize an OTTI of $770 in earnings for the year ended December 31, 2016. Based on internal analysis of the bond as of December 31, 2018, a change in the estimated valuation was not deemed necessary and the carrying value of this bond remained at $230.

The following table provides a roll-forward of credit related impairment recorded in earnings for the years ended December 31:

	2018		2017		2016
Balance at beginning of the period	$	770	$	770	$	—
Additions to credit losses for which no previous OTTI was recognized	—		—		770
Reductions for credit losses realized on securities sold during the period	—		—		—
Balance at end of the period	$	770	$	770	$	770

Based on our analysis which included the criteria outlined above, the fact that we have asserted that we do not have the intent to sell AFS securities in an unrealized loss position, and considering it is unlikely that we will have to sell any AFS securities in an unrealized loss position before recovery of their cost basis, we do not believe that the values of any other AFS securities are other-than-temporarily impaired as of December 31, 2018 and 2017, with the exception of the one municipal bond discussed above.

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Loans and ALLL

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Loans and ALLL

Loans and ALLL

We grant commercial, agricultural, residential real estate, and consumer loans to customers situated primarily in Clare, Gratiot, Isabella, Mecosta, Midland, Montcalm, and Saginaw counties in Michigan. The ability of the borrowers to honor their repayment obligations is often dependent upon the real estate, agricultural, manufacturing, retail, gaming, tourism, higher education, and general economic conditions of this region. Substantially all of our consumer and residential real estate loans are secured by various items of property, while commercial loans are secured primarily by real estate, business assets, and personal guarantees. Some loans are unsecured.

Loans that we have the intent and ability to hold in our portfolio are reported at their outstanding principal balance adjusted for any charge-offs, the ALLL, and any deferred fees or costs. Interest income is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the appropriate yield methods.

The accrual of interest on commercial, agricultural, and residential real estate loans is discontinued at the time the loan is 90 days or more past due unless the credit is well-secured and in the process of short-term collection. Upon transferring the loans to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful.

When loans are placed in nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected, is charged against the ALLL. Loans may be returned to accrual status after six months of continuous performance and achievement of current payment status.

Commercial and agricultural loans include loans for commercial real estate, commercial operating loans, advances to mortgage brokers, farmland and agricultural production, and loans to states and political subdivisions. Repayment of these loans is dependent upon the successful operation and management of a business. We minimize our risk by limiting the amount of direct credit exposure to any one borrower to $15,000. Borrowers with direct credit needs of more than $15,000 may be serviced through the use of loan participations with other commercial banks. Commercial and agricultural real estate loans commonly require loan-to-value limits of 80% or less. Depending upon the type of loan, past credit history, and current operating results, we may require the borrower to pledge accounts receivable, inventory, property, or equipment. Personal guarantees are generally required from the owners of closely held corporations, partnerships, and sole proprietorships. In addition, we may require annual financial statements, prepare cash flow analyses, and review credit reports.

We entered into a mortgage purchase program in 2016 with a financial institution where we participate in advances to mortgage brokers ("advances"). The mortgage brokers originate residential mortgage loans with the intent to sell them on the secondary market. We participate in the advance to the mortgage broker, which is secured by the underlying mortgage loan, until it is ultimately sold on the secondary market. As such, the average life of each participated advance is approximately 20-30 days. Funds from the sale of the loan are used to pay off our participation in the advance to the mortgage broker. We classify these advances as commercial loans and include the outstanding balance in commercial loans on our consolidated balance sheet. Under the participation agreement, we committed to a maximum outstanding aggregate amount of $30,000. The difference between our outstanding balance and the maximum outstanding aggregate amount is classified as “Unfunded commitments under lines of credit” in the “Contractual Obligations and Loan Commitments” section of the Management's Discussion and Analysis of Financial Condition and Results of Operations of this report.

We offer adjustable rate mortgages, construction loans, and fixed rate residential real estate loans which have amortization periods up to a maximum of 30 years. We consider the anticipated direction of interest rates, balance sheet duration, the sensitivity of our balance sheet to changes in interest rates, our liquidity needs, and overall loan demand to determine whether or not to sell fixed rate loans to Freddie Mac.

Our lending policies generally limit the maximum loan-to-value ratio on residential real estate loans to 100% of the lower of the appraised value of the property or the purchase price. Private mortgage insurance is typically required on loans with loan-to-value ratios in excess of 80% unless the loan qualifies for government guarantees.

Underwriting criteria for residential real estate loans generally include:

• Evaluation of the borrower’s ability to make monthly payments.

• Evaluation of the value of the property securing the loan.

• Ensuring the payment of principal, interest, taxes, and hazard insurance does not exceed 28% of a borrower’s gross income.

• Ensuring all debt servicing does not exceed 40% of income.

• Verification of acceptable credit reports.

• Verification of employment, income, and financial information.

Appraisals are performed by independent appraisers and reviewed for appropriateness. Generally, mortgage loan requests are reviewed by our mortgage loan committee or through a secondary market underwriting system; loans in excess of $1,000 require the approval of our Internal Loan Committee, the Executive Loan Committee, the Board of Directors’ Loan Committee, or the Board of Directors.

Consumer loans include secured and unsecured personal loans. Loans are amortized for a period of up to 15 years based on the age and value of the underlying collateral. The underwriting emphasis is on a borrower’s perceived intent and ability to pay rather than collateral value. No consumer loans are sold to the secondary market.

The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the ALLL when we believe the uncollectability of the loan balance is probable. Subsequent recoveries, if any, are credited to the ALLL.

The ALLL is evaluated on a regular basis for appropriateness. Our periodic review of the collectability of the loans considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.

The primary factors behind the determination of the level of the ALLL are specific allocations for impaired loans, historical loss percentages, as well as unallocated components. Specific allocations for impaired loans are primarily determined based on the difference between the loan’s outstanding balance and the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell. Historical loss allocations are calculated at the loan class and segment levels based on a migration analysis of the loan portfolio, with the exception of advances to mortgage brokers, over the preceding five years. With no historical losses on advances to mortgage brokers, there is no allocation in the commercial segment displayed in the following tables. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

A summary of changes in the ALLL and the recorded investment in loans by segments follows:

	Allowance for Loan Losses
	Year Ended December 31, 2018
	Commercial			Agricultural		Residential Real Estate			Consumer			Unallocated		Total
January 1, 2018	$	1,706		$	611	$	2,563		$	900		$	1,920	$	7,700
Charge-offs	(626		)	—		(151		)	(324		)	—		(1,101		)
Recoveries	328			—		261			209			—		798
Provision for loan losses	1,155			164		(681		)	72			268		978
December 31, 2018	$	2,563		$	775	$	1,992		$	857		$	2,188	$	8,375

	Allowance for Loan Losses
	Year Ended December 31, 2017
	Commercial			Agricultural			Residential Real Estate			Consumer			Unallocated		Total
January 1, 2017	$	1,814		$	884		$	2,664		$	624		$	1,414	$	7,400
Charge-offs	(265		)	—			(200		)	(306		)	—		(771		)
Recoveries	453			—			206			159			—		818
Provision for loan losses	(296		)	(273		)	(107		)	423			506		253
December 31, 2017	$	1,706		$	611		$	2,563		$	900		$	1,920	$	7,700

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2018
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	443	$	132	$	1,363	$	—	$	—	$	1,938
Collectively evaluated for impairment	2,120		643		629		857		2,188		6,437
Total	$	2,563	$	775	$	1,992	$	857	$	2,188	$	8,375
Loans
Individually evaluated for impairment	$	9,899	$	14,298	$	6,893	$	9			$	31,099
Collectively evaluated for impairment	649,630		112,863		268,450		66,665				1,097,608
Total	$	659,529	$	127,161	$	275,343	$	66,674			$	1,128,707

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2017
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	650	$	—	$	1,480	$	—	$	—	$	2,130
Collectively evaluated for impairment	1,056		611		1,083		900		1,920		5,570
Total	$	1,706	$	611	$	2,563	$	900	$	1,920	$	7,700
Loans
Individually evaluated for impairment	$	8,099	$	10,598	$	7,939	$	17			$	26,653
Collectively evaluated for impairment	626,660		117,671		264,429		56,106				1,064,866
Total	$	634,759	$	128,269	$	272,368	$	56,123			$	1,091,519

The following tables display the credit quality indicators for commercial and agricultural credit exposures based on internally assigned credit risk ratings as of December 31:

	2018
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	21	$	31	$	—	$	52	$	51	$	28	$	79	$	131
2 - High quality	4,564		13,473		—		18,037		2,729		613		3,342		21,379
3 - High satisfactory	127,573		43,199		11,793		182,565		18,325		7,039		25,364		207,929
4 - Low satisfactory	344,920		84,634		—		429,554		46,636		19,344		65,980		495,534
5 - Special mention	12,847		5,287		—		18,134		10,520		5,624		16,144		34,278
6 - Substandard	7,428		2,002		—		9,430		6,343		4,960		11,303		20,733
7 - Vulnerable	334		1,423		—		1,757		2,716		2,233		4,949		6,706
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	497,687	$	150,049	$	11,793	$	659,529	$	87,320	$	39,841	$	127,161	$	786,690

	2017
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	24	$	316	$	—	$	340	$	—	$	34	$	34	$	374
2 - High quality	8,402		12,262		—		20,664		2,909		1,024		3,933		24,597
3 - High satisfactory	131,826		46,668		12,081		190,575		21,072		8,867		29,939		220,514
4 - Low satisfactory	326,166		75,591		—		401,757		47,835		18,467		66,302		468,059
5 - Special mention	8,986		3,889		—		12,875		10,493		8,546		19,039		31,914
6 - Substandard	5,521		2,298		—		7,819		4,325		2,747		7,072		14,891
7 - Vulnerable	729		—		—		729		1,531		419		1,950		2,679
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	481,654	$	141,024	$	12,081	$	634,759	$	88,165	$	40,104	$	128,269	$	763,028

Internally assigned credit risk ratings are reviewed, at a minimum, when loans are renewed or when management has knowledge of improvements or deterioration of the credit quality of individual credits. Descriptions of the internally assigned credit risk ratings for commercial and agricultural loans are as follows:

1. EXCELLENT – Substantially Risk Free

Credit has strong financial condition and solid earnings history, characterized by:

• High liquidity, strong cash flow, low leverage.

• Unquestioned ability to meet all obligations when due.

• Experienced management, with management succession in place.

• Secured by cash.

2. HIGH QUALITY – Limited Risk

Credit with sound financial condition and a positive trend in earnings supplemented by:

• Favorable liquidity and leverage ratios.

• Ability to meet all obligations when due.

• Management with successful track record.

• Steady and satisfactory earnings history.

• If loan is secured, collateral is of high quality and readily marketable.

• Access to alternative financing.

• Well defined primary and secondary source of repayment.

• If supported by guaranty, the financial strength and liquidity of the guarantor(s) are clearly evident.

3.HIGH SATISFACTORY – Reasonable Risk

Credit with satisfactory financial condition and further characterized by:

• Working capital adequate to support operations.

• Cash flow sufficient to pay debts as scheduled.

• Management experience and depth appear favorable.

• Loan performing according to terms.

• If loan is secured, collateral is acceptable and loan is fully protected.

4. LOW SATISFACTORY – Acceptable Risk

Credit with bankable risks, although some signs of weaknesses are shown:

• Would include most start-up businesses.

• Occasional instances of trade slowness or repayment delinquency – may have been 10-30 days slow within the past year.

• Management’s abilities are apparent yet unproven.

• Weakness in primary source of repayment with adequate secondary source of repayment.

• Loan structure generally in accordance with policy.

• If secured, loan collateral coverage is marginal.

To be classified as less than satisfactory, only one of the following criteria must be met.

5. SPECIAL MENTION – Criticized

Credit constitutes an undue and unwarranted credit risk but not to the point of justifying a classification of substandard. The credit risk may be relatively minor yet constitutes an unwarranted risk in light of the circumstances surrounding a specific loan:

• Downward trend in sales, profit levels, and margins.

• Impaired working capital position.

• Cash flow is strained in order to meet debt repayment.

• Loan delinquency (30-60 days) and overdrafts may occur.

• Shrinking equity cushion.

• Diminishing primary source of repayment and questionable secondary source.

• Management abilities are questionable.

• Weak industry conditions.

• Litigation pending against the borrower.

• Loan may need to be restructured to improve collateral position or reduce payments.

• Collateral or guaranty offers limited protection.

• Negative debt service coverage, however the credit is well collateralized and payments are current.

6. SUBSTANDARD – Classified

Credit is inadequately protected by the current net worth and paying capacity of the borrower or of the collateral pledged. There is a distinct possibility we will implement collection procedures if the loan deficiencies are not corrected. Any commercial loan placed in nonaccrual status will be rated "7" or worse. In addition, the following characteristics may apply:

• Sustained losses have severely eroded the equity and cash flow.

• Deteriorating liquidity.

• Serious management problems or internal fraud.

• Original repayment terms liberalized.

• Likelihood of bankruptcy.

• Inability to access other funding sources.

• Reliance on secondary source of repayment.

• Litigation filed against borrower.

• Interest non-accrual may be warranted.

• Collateral provides little or no value.

• Requires excessive attention of the loan officer.

• Borrower is uncooperative with loan officer.

7.VULNERABLE – Classified

Credit is considered “Substandard” and warrants placing in nonaccrual status. Risk of loss is being evaluated and exit strategy options are under review. Other characteristics that may apply:

• Insufficient cash flow to service debt.

• Minimal or no payments being received.

• Limited options available to avoid the collection process.

• Transition status, expect action will take place to collect loan without immediate progress being made.

8. DOUBTFUL – Workout

Credit has all the weaknesses inherent in a “Substandard” loan with the added characteristic that collection and/or liquidation is pending. The possibility of a loss is extremely high, but its classification as a loss is deferred until liquidation procedures are completed, or reasonably estimable. Other characteristics that may apply:

• Normal operations are severely diminished or have ceased.

• Seriously impaired cash flow.

• Original repayment terms materially altered.

• Secondary source of repayment is inadequate.

• Survivability as a “going concern” is impossible.

• Collection process has begun.

• Bankruptcy petition has been filed.

• Judgments have been filed.

• Portion of the loan balance has been charged-off.

9. LOSS – Charge-off

Credit is considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification is for charged-off loans but does not mean that the asset has absolutely no recovery or salvage value. These loans are further characterized by:

• Liquidation or reorganization under Bankruptcy, with poor prospects of collection.

• Fraudulently overstated assets and/or earnings.

• Collateral has marginal or no value.

• Debtor cannot be located.

• Over 120 days delinquent.

Our primary credit quality indicator for residential real estate and consumer loans is the individual loan’s past due aging. The following tables summarize the past due and current loans as of December 31:

	2018
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	60	$	—	$	—	$	334	$	394	$	497,293	$	497,687
Commercial other	277		628		—		1,423		2,328		147,721		150,049
Advances to mortgage brokers	—		—		—		—		—		11,793		11,793
Total commercial	337		628		—		1,757		2,722		656,807		659,529
Agricultural
Agricultural real estate	428		—		—		2,716		3,144		84,176		87,320
Agricultural other	—		—		—		2,233		2,233		37,608		39,841
Total agricultural	428		—		—		4,949		5,377		121,784		127,161
Residential real estate
Senior liens	2,254		203		113		554		3,124		233,438		236,562
Junior liens	2		6		—		—		8		6,001		6,009
Home equity lines of credit	76		—		—		—		76		32,696		32,772
Total residential real estate	2,332		209		113		554		3,208		272,135		275,343
Consumer
Secured	95		—		—		—		95		62,721		62,816
Unsecured	10		—		—		—		10		3,848		3,858
Total consumer	105		—		—		—		105		66,569		66,674
Total	$	3,202	$	837	$	113	$	7,260	$	11,412	$	1,117,295	$	1,128,707

	2017
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	295	$	325	$	54	$	729	$	1,403	$	480,251	$	481,654
Commercial other	1,069		28		18		—		1,115		139,909		141,024
Advances to mortgage brokers	—		—		—		—		—		12,081		12,081
Total commercial	1,364		353		72		729		2,518		632,241		634,759
Agricultural
Agricultural real estate	84		190		—		1,531		1,805		86,360		88,165
Agricultural other	39		—		104		419		562		39,542		40,104
Total agricultural	123		190		104		1,950		2,367		125,902		128,269
Residential real estate
Senior liens	3,718		234		132		325		4,409		225,007		229,416
Junior liens	69		10		—		23		102		6,812		6,914
Home equity lines of credit	293		—		77		—		370		35,668		36,038
Total residential real estate	4,080		244		209		348		4,881		267,487		272,368
Consumer
Secured	37		10		10		—		57		52,005		52,062
Unsecured	13		—		—		—		13		4,048		4,061
Total consumer	50		10		10		—		70		56,053		56,123
Total	$	5,617	$	797	$	395	$	3,027	$	9,836	$	1,081,683	$	1,091,519

Impaired Loans

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance (in whole or in part);

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis for commercial and agricultural loans by comparing the loan’s outstanding balance to the present value of expected future cash flows discounted at the loan’s effective interest rate, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. Large groups of smaller-balance, homogeneous residential real estate and consumer loans are collectively evaluated for impairment by comparing the loan’s unpaid principal balance to the present value of expected future cash flows discounted at the loan’s effective interest rate.

We do not recognize interest income on impaired loans in nonaccrual status. For impaired loans not classified as nonaccrual, interest income is recognized daily, as earned, according to the terms of the loan agreement and the principal amount outstanding. The following summarizes information pertaining to impaired loans as of, and for the years ended, December 31:

	2018
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	3,969	$	4,211	$	437	$	4,589	$	129
Commercial other	12		12		6		1,040		55
Agricultural real estate	392		392		112		606		50
Agricultural other	44		44		20		168		46
Residential real estate senior liens	6,834		7,289		1,361		7,545		126
Residential real estate junior liens	12		12		2		25		—
Home equity lines of credit	—		—		—		—		—
Total impaired loans with a valuation allowance	11,263		11,960		1,938		13,973		406
Impaired loans without a valuation allowance
Commercial real estate	2,794		2,947				2,728		74
Commercial other	3,124		3,231				1,533		43
Agricultural real estate	7,618		7,618				7,559		585
Agricultural other	6,244		6,287				4,636		279
Home equity lines of credit	47		347				64		5
Consumer secured	9		9				12		—
Total impaired loans without a valuation allowance	19,836		20,439				16,532		986
Impaired loans
Commercial	9,899		10,401		443		9,890		301
Agricultural	14,298		14,341		132		12,969		960
Residential real estate	6,893		7,648		1,363		7,634		131
Consumer	9		9		—		12		—
Total impaired loans	$	31,099	$	32,399	$	1,938	$	30,505	$	1,392

	2017
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	4,089	$	4,378	$	626	$	4,608	$	277
Commercial other	995		995		24		1,427		93
Agricultural real estate	—		—		—		—		—
Agricultural other	—		—		—		17		—
Residential real estate senior liens	7,816		8,459		1,473		8,296		323
Residential real estate junior liens	44		44		7		71		2
Home equity lines of credit	—		—		—		23		—
Total impaired loans with a valuation allowance	12,944		13,876		2,130		14,442		695
Impaired loans without a valuation allowance
Commercial real estate	1,791		1,865				1,585		111
Commercial other	1,224		1,224				246		23
Agricultural real estate	7,913		7,913				6,421		307
Agricultural other	2,685		2,685				2,494		126
Home equity lines of credit	79		379				106		19
Consumer secured	17		17				21		—
Total impaired loans without a valuation allowance	13,709		14,083				10,873		586
Impaired loans
Commercial	8,099		8,462		650		7,866		504
Agricultural	10,598		10,598		—		8,932		433
Residential real estate	7,939		8,882		1,480		8,496		344
Consumer	17		17		—		21		—
Total impaired loans	$	26,653	$	27,959	$	2,130	$	25,315	$	1,281

We had committed to advance $542 and $472 in connection with impaired loans, which includes TDRs, as of December 31, 2018 and 2017, respectively.

Troubled Debt Restructurings

A loan modification is considered to be a TDR when the modification includes terms outside of normal lending practices to a borrower who is experiencing financial difficulties.

Typical concessions granted include, but are not limited to:

1. Agreeing to interest rates below prevailing market rates for debt with similar risk characteristics.

2. Extending the amortization period beyond typical lending guidelines for loans with similar risk characteristics.

3. Agreeing to an interest only payment structure and delaying principal payments.

4. Forgiving principal.

5. Forgiving accrued interest.

To determine if a borrower is experiencing financial difficulties, factors we consider include:

1. The borrower is currently in default on any of their debt.

2. The borrower would likely default on any of their debt if the concession is not granted.

3. The borrower’s cash flow is insufficient to service all of their debt if the concession is not granted.

4. The borrower has declared, or is in the process of declaring, bankruptcy.

5. The borrower is unlikely to continue as a going concern (if the entity is a business).

The following is a summary of information pertaining to TDRs granted in the years ended December 31:

	2018					2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment
Commercial other	4	$	1,360	$	1,360	6	$	1,702	$	1,702
Agricultural other	31	6,318		6,295		15	6,092		6,092
Residential real estate
Senior liens	10	701		701		6	464		464
Junior liens	—	—		—		1	8		8
Total residential real estate	10	701		701		7	472		472
Total	45	$	8,379	$	8,356	28	$	8,266	$	8,266

The following tables summarize concessions we granted to borrowers in financial difficulty in the years ended December 31:

	2018						2017
	Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period			Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period
	Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment
Commercial other	1	$	174	3	$	1,186	—	$	—	6	$	1,702
Agricultural other	18	2,625		13	3,693		11	1,972		4	4,120
Residential real estate
Senior liens	3	203		7	498		—	—		6	464
Junior liens	—	—		—	—		1	8		—	—
Total residential real estate	3	203		7	498		1	8		6	464
Total	22	$	3,002	23	$	5,377	12	$	1,980	16	$	6,286

We did not restructure any loans by forgiving principal or accrued interest during 2018 or 2017.

Based on our historical loss experience, losses associated with TDRs are not significantly different than other impaired loans within the same loan segment. As such, TDRs, including TDRs that have been modified in the past 12 months that subsequently defaulted, are analyzed in the same manner as other impaired loans within their respective loan segment.

We had no loans that defaulted in the years ended December 31, 2018 and 2017, which were modified within 12 months prior to the default date.

The following is a summary of TDR loan balances as of December 31:

	2018		2017
TDRs	$	26,951	$	26,197

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Premises and Equipment

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Premises and Equipment

Premises and Equipment

A summary of premises and equipment at December 31 follows:

	2018		2017
Land	$	6,336	$	6,336
Buildings and improvements	30,100		29,661
Furniture and equipment	34,825		33,466
Total	71,261		69,463
Less: accumulated depreciation	43,446		41,013
Premises and equipment, net	$	27,815	$	28,450

Depreciation expense amounted to $2,940, $2,902, and $2,821 in 2018, 2017, and 2016, respectively.

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Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill and Other Intangible Assets

The carrying amount of goodwill was $48,282 at December 31, 2018 and 2017.

Identifiable intangible assets were as follows as of December 31:

	2018
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,410	$	169

	2017
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,314	$	265

Amortization expense associated with identifiable intangible assets was $96, $119, and $162 in 2018, 2017, and 2016, respectively.

Estimated amortization expense associated with identifiable intangibles for each of the next five years succeeding December 31, 2018, and thereafter is as follows:

	Estimated Amortization Expense
2019	$	71
2020	48
2021	29
2022	15
2023	2
Thereafter	4
Total	$	169

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Borrowed Funds

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Borrowed Funds

Borrowed Funds

Borrowed funds consist of the following obligations at December 31:

	2018				2017
	Amount		Rate		Amount		Rate
FHLB advances	$	300,000	2.20	%	$	290,000	1.94	%
Securities sold under agreements to repurchase without stated maturity dates	40,299		0.11	%	54,878		0.12	%
Total	$	340,299	1.95	%	$	344,878	1.65	%

FHLB advances are collateralized by a blanket lien on all qualified 1-4 family residential real estate loans, specific AFS securities, and FHLB stock.

The following table lists the maturities and weighted average interest rates of FHLB advances as of December 31:

	2018				2017
	Amount		Rate		Amount		Rate
Fixed rate due 2018	$	—	—	%	$	70,000	1.96	%
Fixed rate due 2019	100,000		1.94	%	85,000		1.87	%
Fixed rate due 2020	55,000		2.18	%	35,000		1.80	%
Fixed rate due 2021	50,000		1.91	%	50,000		1.91	%
Variable rate due 2021 (1)	10,000		2.93	%	10,000		1.72	%
Fixed rate due 2022	20,000		1.97	%	20,000		1.97	%
Fixed rate due 2023	35,000		3.17	%	10,000		3.90	%
Fixed rate due 2024	20,000		2.96	%	—		—	%
Fixed rate due 2026	10,000		1.17	%	10,000		1.17	%
Total	$	300,000	2.20	%	$	290,000	1.94	%

⁽¹⁾ Hedged advance (see "Derivative Instruments" section below)

Securities sold under agreements to repurchase are classified as secured borrowings and are reflected at the amount of cash received in connection with the transaction. The securities underlying the agreements have a carrying value and a fair value of $40,316 and $54,898 at December 31, 2018 and 2017, respectively. Such securities remain under our control. We may be required to provide additional collateral based on the fair value of underlying securities.

Securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount Window advances generally mature within one to four days from the transaction date. The following tables provide a summary of securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount advances at December 31:

	2018						2017
	Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period		Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period
Securities sold under agreements to repurchase without stated maturity dates	$	63,133	$	38,036	0.10	%	$	58,464	$	55,206	0.13	%
Federal funds purchased	16,200		3,741		1.78	%	5,965		2,726		1.15	%
FRB Discount Window	—		—		—	%	—		43		1.54	%

We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at December 31:

	2018		2017
Pledged to secure borrowed funds	$	431,430	$	410,988
Pledged to secure repurchase agreements	40,316		54,898
Pledged for public deposits and for other purposes necessary or required by law	58,107		27,976
Total	$	529,853	$	493,862

AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at December 31:

	2018		2017
States and political subdivisions	$	23,268	$	7,332
Mortgage-backed securities	10,736		13,199
Collateralized mortgage obligations	6,312		34,367
Total	$	40,316	$	54,898

AFS securities pledged to repurchase agreements are monitored to ensure the appropriate level is collateralized. In the event of maturities, calls, significant principal repayments, or significant decline in market values, we have an adequate level of AFS securities available to pledge to satisfy required collateral.

As of December 31, 2018, we had the ability to borrow up to an additional $150,162, based on assets pledged as collateral. We had no investment securities that were restricted to be pledged for specific purposes.

Derivative Instruments

We enter into interest rate swaps to manage exposure to interest rate risk and variability in cash flows. The interest rate swaps, associated with our variable rate borrowings, are designated upon inception as cash flow hedges of forecasted interest payments. We enter into LIBOR-based interest rate swaps that involve the receipt of variable amounts in exchange for fixed rate payments, in effect converting variable rate debt to fixed rate debt.

Cash flow hedges are assessed for effectiveness using regression analysis. The effective portion of changes in fair value are recorded in OCI and subsequently reclassified into interest expense in the same period in which the related interest on the variable rate borrowings affects earnings. In the event that a portion of the changes in fair value were determined to be ineffective, the ineffective amount would be recorded in earnings.

The following tables provide information on derivatives related to variable rate borrowings as of December 31:

	2018
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	2.3	$	10,000	Other Assets	$	323

	2017
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	3.3	$	10,000	Other Assets	$	291

Derivatives contain an element of credit risk which arises from the possibility that we will incur a loss as a result of a counterparty failing to meet its contractual obligations. Credit risk is minimized through counterparty collateral, transaction limits and monitoring procedures. We also manage dealer credit risk by entering into interest rate derivatives only with primary and highly rated counterparties, the use of ISDA master agreements, and the use of counterparty limits. We do not anticipate any losses from failure of interest rate derivative counterparties to honor their obligations.

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Deposits

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Deposits

Deposits

Scheduled maturities of time deposits for the next five years, and thereafter, are as follows:

	Scheduled Maturities of Time Deposits
2019	$	232,349
2020	56,051
2021	65,036
2022	41,502
2023	31,714
Thereafter	6,968
Total	$	433,620

Interest expense on time deposits greater than $250 was $1,280 in 2018, $825 in 2017 and $678 in 2016.

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Off-Balance-Sheet Activities

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Off-Balance-Sheet Activities

Off-Balance-Sheet Activities, Commitments and Other Matters

Credit-Related Financial Instruments

We are party to credit related financial instruments with off-balance-sheet risk. These financial instruments are entered into during the normal course of business to meet the financing needs of our customers. These financial instruments, which include commitments to extend credit and standby letters of credit, involve, to varying degrees, elements of credit and IRR in excess of the amounts recognized in the consolidated balance sheets. The contract or notional amounts of these instruments reflect the extent of involvement we have in a particular class of financial instrument.

The following table summarizes our credit related financial instruments with off-balance-sheet risk as of December 31:

	2018		2017
Unfunded commitments under lines of credit	$	199,652	$	184,317
Commercial and standby letters of credit	1,723		1,622
Commitments to grant loans	13,225		24,782
Total	$	214,600	$	210,721

Unfunded commitments under lines of credit are commitments for possible future extensions of credit to existing customers. These commitments may expire without being drawn upon and do not necessarily represent future cash requirements. Advances to mortgage brokers are also included in unfunded commitments under lines of credit. The unfunded commitment is the difference between our outstanding balances and maximum outstanding aggregate amount.

Commitments to grant loans are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The amount of collateral obtained, if we deem necessary, is based on management's credit evaluation of the customer. Commitments to grant loans include residential mortgage loans that may be committed to be sold to the secondary market.

Commercial and standby letters of credit are conditional commitments we issued to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements, including commercial paper, bond financing, and similar transactions. These commitments to extend credit and letters of credit generally mature within one year. The credit risk involved in these transactions is essentially the same as that involved in extending loans to customers. We evaluate each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if we deem necessary upon the extension of credit, is based on our credit evaluation of the borrower. While we consider standby letters of credit to be guarantees, the amount of the liability related to such guarantees on the commitment date is not significant and a liability related to such guarantees is not recorded on the consolidated balance sheets.

Our exposure to credit-related loss in the event of nonperformance by the counter parties to the financial instruments for commitments to extend credit and standby letters of credit could be up to the contractual notional amount of those instruments. We use the same credit policies in deciding to make these commitments as we do for extending loans to customers. No significant losses are anticipated as a result of these commitments.

Derivative Loan Commitments

Mortgage loan commitments are referred to as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. We enter into commitments to fund residential mortgage loans at specific times in the future, with the intention that these loans will subsequently be sold in the secondary market. A mortgage loan commitment binds us to lend funds to a potential borrower at a specified interest rate within a specified period of time, generally up to 60 days after inception of the rate lock.

Outstanding derivative loan commitments expose us to the risk that the price of the loans arising from the exercise of the loan commitment might decline from the inception of the rate lock to funding of the loan due to increases in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increase. The notional amount of undesignated interest rate lock commitments was $1,088 and $805 at December 31, 2018 and 2017, respectively.

Forward Loan Sale Commitments

To protect against the price risk inherent in derivative loan commitments, we utilize both “mandatory delivery” and “best efforts” forward loan sale commitments to mitigate the risk of potential decreases in the values of loan that would result from the exercise of the derivative loan commitments.

With a “mandatory delivery” contract, we commit to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If we fail to deliver the amount of mortgages necessary to fulfill the commitment by the specified date, we are obligated to pay a “pair-off” fee, based on then current market prices, to the investor to compensate the investor for the shortfall.

With a “best efforts” contract, we commit to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally, the price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g. on the same day the lender commits to lend funds to a potential borrower).

We expect that these forward loan sale commitments will experience changes in fair value opposite to the change in fair value of derivative loan commitments. The notional amount of undesignated forward loan sale commitments was $1,089 and $1,843 at December 31, 2018 and 2017, respectively.

The fair values of the rate lock loan commitments related to the origination of mortgage loans that will be held for sale and the forward loan sale commitments are deemed insignificant by management and, accordingly, are not recorded in our consolidated financial statements.

Other Matters

Banking regulations require us to maintain cash reserve balances in currency or deposits with the FRB. At December 31, 2018 and 2017, the reserve balances amounted to $1,220 and $1,458, respectively.

Banking regulations limit the transfer of assets in the form of dividends, loans, or advances from the Bank to the Corporation. At December 31, 2018, substantially all of the Bank’s assets were restricted from transfer to the Corporation in the form of loans or advances. Bank dividends are the principal source of funds for the Corporation. Payment of dividends without regulatory approval is limited to the current year’s retained net income plus retained net income for the preceding two years, less any required transfers to common stock. At January 1, 2019, the amount available to the Corporation for dividends from the Bank, without regulatory approval, was approximately $18,900.

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Commitments and Other Matters

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Other Matters

Off-Balance-Sheet Activities, Commitments and Other Matters

Credit-Related Financial Instruments

We are party to credit related financial instruments with off-balance-sheet risk. These financial instruments are entered into during the normal course of business to meet the financing needs of our customers. These financial instruments, which include commitments to extend credit and standby letters of credit, involve, to varying degrees, elements of credit and IRR in excess of the amounts recognized in the consolidated balance sheets. The contract or notional amounts of these instruments reflect the extent of involvement we have in a particular class of financial instrument.

The following table summarizes our credit related financial instruments with off-balance-sheet risk as of December 31:

	2018		2017
Unfunded commitments under lines of credit	$	199,652	$	184,317
Commercial and standby letters of credit	1,723		1,622
Commitments to grant loans	13,225		24,782
Total	$	214,600	$	210,721

Unfunded commitments under lines of credit are commitments for possible future extensions of credit to existing customers. These commitments may expire without being drawn upon and do not necessarily represent future cash requirements. Advances to mortgage brokers are also included in unfunded commitments under lines of credit. The unfunded commitment is the difference between our outstanding balances and maximum outstanding aggregate amount.

Commitments to grant loans are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The amount of collateral obtained, if we deem necessary, is based on management's credit evaluation of the customer. Commitments to grant loans include residential mortgage loans that may be committed to be sold to the secondary market.

Commercial and standby letters of credit are conditional commitments we issued to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support private borrowing arrangements, including commercial paper, bond financing, and similar transactions. These commitments to extend credit and letters of credit generally mature within one year. The credit risk involved in these transactions is essentially the same as that involved in extending loans to customers. We evaluate each customer’s credit worthiness on a case-by-case basis. The amount of collateral obtained, if we deem necessary upon the extension of credit, is based on our credit evaluation of the borrower. While we consider standby letters of credit to be guarantees, the amount of the liability related to such guarantees on the commitment date is not significant and a liability related to such guarantees is not recorded on the consolidated balance sheets.

Our exposure to credit-related loss in the event of nonperformance by the counter parties to the financial instruments for commitments to extend credit and standby letters of credit could be up to the contractual notional amount of those instruments. We use the same credit policies in deciding to make these commitments as we do for extending loans to customers. No significant losses are anticipated as a result of these commitments.

Derivative Loan Commitments

Mortgage loan commitments are referred to as derivative loan commitments if the loan that will result from exercise of the commitment will be held for sale upon funding. We enter into commitments to fund residential mortgage loans at specific times in the future, with the intention that these loans will subsequently be sold in the secondary market. A mortgage loan commitment binds us to lend funds to a potential borrower at a specified interest rate within a specified period of time, generally up to 60 days after inception of the rate lock.

Outstanding derivative loan commitments expose us to the risk that the price of the loans arising from the exercise of the loan commitment might decline from the inception of the rate lock to funding of the loan due to increases in mortgage interest rates. If interest rates increase, the value of these loan commitments decreases. Conversely, if interest rates decrease, the value of these loan commitments increase. The notional amount of undesignated interest rate lock commitments was $1,088 and $805 at December 31, 2018 and 2017, respectively.

Forward Loan Sale Commitments

To protect against the price risk inherent in derivative loan commitments, we utilize both “mandatory delivery” and “best efforts” forward loan sale commitments to mitigate the risk of potential decreases in the values of loan that would result from the exercise of the derivative loan commitments.

With a “mandatory delivery” contract, we commit to deliver a certain principal amount of mortgage loans to an investor at a specified price on or before a specified date. If we fail to deliver the amount of mortgages necessary to fulfill the commitment by the specified date, we are obligated to pay a “pair-off” fee, based on then current market prices, to the investor to compensate the investor for the shortfall.

With a “best efforts” contract, we commit to deliver an individual mortgage loan of a specified principal amount and quality to an investor if the loan to the underlying borrower closes. Generally, the price the investor will pay the seller for an individual loan is specified prior to the loan being funded (e.g. on the same day the lender commits to lend funds to a potential borrower).

We expect that these forward loan sale commitments will experience changes in fair value opposite to the change in fair value of derivative loan commitments. The notional amount of undesignated forward loan sale commitments was $1,089 and $1,843 at December 31, 2018 and 2017, respectively.

The fair values of the rate lock loan commitments related to the origination of mortgage loans that will be held for sale and the forward loan sale commitments are deemed insignificant by management and, accordingly, are not recorded in our consolidated financial statements.

Other Matters

Banking regulations require us to maintain cash reserve balances in currency or deposits with the FRB. At December 31, 2018 and 2017, the reserve balances amounted to $1,220 and $1,458, respectively.

Banking regulations limit the transfer of assets in the form of dividends, loans, or advances from the Bank to the Corporation. At December 31, 2018, substantially all of the Bank’s assets were restricted from transfer to the Corporation in the form of loans or advances. Bank dividends are the principal source of funds for the Corporation. Payment of dividends without regulatory approval is limited to the current year’s retained net income plus retained net income for the preceding two years, less any required transfers to common stock. At January 1, 2019, the amount available to the Corporation for dividends from the Bank, without regulatory approval, was approximately $18,900.

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Minimum Regulatory Capital Requirements

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Minimum Regulatory Capital Requirements

Minimum Regulatory Capital Requirements

The Corporation (on a consolidated basis) and the Bank are subject to various regulatory capital requirements administered by the FRB and the FDIC. Failure to meet minimum capital requirements can initiate mandatory and possibly additional discretionary actions by the FRB and the FDIC that, if undertaken, could have a material effect on our financial statements. Under regulatory capital adequacy guidelines and the regulatory framework for prompt corrective action, we must meet specific capital guidelines that include quantitative measures of assets, liabilities, capital, and certain off-balance-sheet items, as calculated under regulatory accounting standards. Our capital amounts and classifications are also subject to qualitative judgments by the FRB and the FDIC about components, risk weightings, and other factors. Prompt corrective action provisions are not applicable to bank holding companies.

Quantitative measures established by regulation to ensure capital adequacy require us to maintain minimum amounts and ratios (set forth in the following table) of total capital, tier 1 capital, and common equity tier 1 capital (as defined in the regulations) to risk-weighted assets (as defined) and tier 1 capital to average assets (as defined). We believe, as of December 31, 2018 and 2017, that we met all capital adequacy requirements.

The FRB has established minimum risk-based capital guidelines. Pursuant to these guidelines, a framework has been established that assigns risk weights to each category of on and off-balance-sheet items to arrive at risk adjusted total assets. Regulatory capital is divided by the risk adjusted assets with the resulting ratio compared to the minimum standard to determine whether a corporation has adequate capital. On July 2, 2013, the FRB published revised BASEL III Capital standards for banks. The final rules redefine what is included or deducted from equity capital, changes risk weighting for certain on and off-balance sheet assets, increases the minimum required equity capital to be considered well capitalized, and introduces a capital cushion buffer. The rules, which are being gradually phased in between 2015 and 2019, are not expected to have a material impact on the Corporation but will require us to hold more capital than we have historically.

Effective January 1, 2015, the minimum standard for primary, or tier 1, capital increased from 4.00% to 6.00%. The minimum standard for total capital remained at 8.00%. Also effective January 1, 2015 was the new common equity tier 1 capital ratio which had a minimum requirement of 4.50%. Beginning on January 1, 2016 the capital conservation buffer went into effect which will further increase the required levels each year through 2019.

As of December 31, 2018 and 2017, the most recent notifications from the FRB and the FDIC categorized us as well capitalized under the regulatory framework for prompt corrective action. To be categorized as well capitalized, an institution must maintain total risk-based, Tier 1 risk-based, Common Equity Tier 1, and Tier 1 leverage ratios as set forth in the following tables. There are no conditions or events since the notifications that we believe have changed our categories. Our actual capital amounts and ratios are also presented in the table.

	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2018
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	143,429	11.75	%	$	48,832	6.375	%	$	73,248	6.50	%
Consolidated	154,705		12.58	%	49,212		6.375	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	143,429		11.75	%	48,832		7.875	%	73,248		8.00	%
Consolidated	154,705		12.58	%	49,212		7.875	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	151,804		12.43	%	97,664		9.875	%	122,080		10.00	%
Consolidated	163,080		13.26	%	98,423		9.875	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	143,429		8.07	%	71,085		4.00	%	88,856		5.00	%
Consolidated	154,705		8.72	%	70,996		4.00	%	N/A		N/A

	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	139,897	11.56	%	$	48,404	5.750	%	$	72,605	6.50	%
Consolidated	149,013		12.23	%	48,744		5.750	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	139,897		11.56	%	48,404		7.250	%	72,605		8.00	%
Consolidated	149,013		12.23	%	48,744		7.250	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	147,597		12.20	%	96,807		9.250	%	121,009		10.00	%
Consolidated	156,713		12.86	%	97,488		9.250	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	139,897		8.07	%	69,373		4.000	%	86,717		5.00	%
Consolidated	149,013		8.54	%	69,827		4.000	%	N/A		N/A

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Computation of Earnings Per Common Share

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of Earnings Per Common Share

Computation of Earnings Per Common Share

Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan, see "Note 12 – Benefit Plans."

Earnings per common share have been computed based on the following:

	2018		2017		2016
Average number of common shares outstanding for basic calculation	7,872,077		7,841,451		7,813,739
Average potential effect of common shares in the Directors Plan (1)	200,771		192,286		185,611
Average number of common shares outstanding used to calculate diluted earnings per common share	8,072,848		8,033,737		7,999,350
Net income	$	14,021	$	13,237	$	13,799
Earnings per common share
Basic	$	1.78	$	1.69	$	1.77
Diluted	$	1.74	$	1.65	$	1.73

⁽¹⁾ Exclusive of shares held in the Rabbi Trust

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Benefit Plans

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Benefit Plans

Benefit Plans

401(k) Plan

We have a 401(k) plan in which substantially all employees are eligible to participate. Employees may contribute up to 100% of their compensation subject to certain limits based on federal tax laws. The plan was amended in 2013 to provide a matching safe harbor contribution for all eligible employees equal to 100% of the first 5.0% of an employee's compensation contributed to the Plan during the year. Employees are 100% vested in the safe harbor matching contributions.

For 2018, 2017 and 2016, expenses attributable to the Plan were $743, $713, and $686, respectively.

Defined Benefit Pension Plan

We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. As a result of the curtailment, future salary increases are no longer considered (the projected benefit obligation is equal to the accumulated benefit obligation), and plan benefits are based on years of service and the individual employee’s five highest consecutive years of compensation out of the last ten years of service through March 1, 2007.

Changes in the projected benefit obligation and plan assets during each year, the funded status of the plan, and the net amount recognized in our consolidated balance sheets using an actuarial measurement date of December 31, are summarized as follows during the years ended December 31:

	2018			2017
Change in benefit obligation
Benefit obligation, January 1	$	11,381		$	11,448
Interest cost	388			444
Actuarial (gain) loss	(1,194		)	578
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Benefit obligation, December 31	9,412			11,381
Change in plan assets
Fair value of plan assets, January 1	9,469			9,325
Investment (loss) return	(541		)	1,033
Contributions	—			200
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Fair value of plan assets, December 31	7,765			9,469
Deficiency in funded status at December 31, included on the consolidated balance sheets in accrued interest payable and other liabilities	$	(1,647	)	$	(1,912	)

	2018			2017
Change in accrued pension benefit costs
Accrued benefit cost at January 1	$	(1,912	)	$	(2,123	)
Contributions	—			200
Net periodic benefit cost	(345		)	(412		)
Net change in unrecognized actuarial loss and prior service cost	610			423
Accrued pension benefit cost at December 31	$	(1,647	)	$	(1,912	)

We have recorded the funded status of the plan in our consolidated balance sheets. We adjust the underfunded status in a liability account to reflect the current funded status of the plan. Any gains or losses that arise during the year but are not recognized as components of net periodic benefit cost are recognized as a component of other comprehensive income (loss). The components of net periodic benefit cost are as follows for the years ended December 31:

	2018			2017			2016
Interest cost on benefit obligation	$	388		$	444		$	485
Expected return on plan assets	(554		)	(546		)	(560		)
Amortization of unrecognized actuarial net loss	242			279			313
Settlement loss	269			235			—
Net periodic benefit cost	$	345		$	412		$	238

During 2018, 2017 and 2016, additional settlement losses of $269, $235 and $0 were recognized in connection with lump-sum benefit distributions. Many plan participants elect to receive their retirement benefit payments in the form of lump-sum settlements. Pro rata settlement losses, which can occasionally occur as a result of these lump-sum distributions, are recognized only in years when the total of such distributions exceed the sum of the service and interest expense components of net periodic benefit cost.

Accumulated other comprehensive income at December 31, 2018 includes net unrecognized pension costs before income taxes of $3,470, of which $140 is expected to be amortized into benefit cost during 2019.

The actuarial assumptions used in determining the benefit obligation are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	4.11	%	3.48	%	3.96	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

The actuarial weighted average assumptions used in determining the net periodic pension costs are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	3.48	%	3.96	%	4.13	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

As a result of the curtailment of the Plan, there is no rate of compensation increase considered in the above assumptions.

The expected long-term rate of return is an estimate of anticipated future long-term rates of return on plan assets as measured on a market value basis. Factors considered in arriving at this assumption include:

• Historical long-term rates of return for broad asset classes.

• Actual past rates of return achieved by the plan.

• The general mix of assets held by the plan.

• The stated investment policy for the plan.

The selected rate of return is net of anticipated investment related expenses.

Pension Plan Assets

Our overall investment strategy is to moderately grow the portfolio by investing 50% of the portfolio in equity securities and 50% in fixed income securities. This strategy is designed to generate a long-term rate of return of 6.00%.  Equity securities primarily consist of the S&P 500 Index with a smaller allocation to the Small Cap and International Index.  Fixed income securities are invested in the Bond Market Index.  The Plan has appropriate assets invested in short-term investments to meet near term benefit payments.

The asset mix and the sector weighting of the investments are determined by our pension committee, which is comprised of members of our management. To manage the Plan, we retain a third party investment advisor to conduct consultations. We review the performance of the advisor at least annually.

The fair values of our pension plan assets by asset category were as follows as of December 31:

	2018				2017
	Total		(Level 2)		Total		(Level 2)
Short-term investments	$	98	$	98	$	300	$	300
Common collective trusts
Fixed income	2,924		2,924		3,815		3,815
Equity investments	4,743		4,743		5,354		5,354
Total	$	7,765	$	7,765	$	9,469	$	9,469

The following is a description of the valuation methodologies used for assets measured at fair value. There have been no changes in the methodologies used at December 31, 2018 and 2017:

• Short-term investments: Shares of a money market portfolio valued at amortized cost, which approximates fair value.

• Common collective trusts: These investments are public investment securities valued using the NAV provided by a third party investment advisor. The NAV is quoted on a private market that is not active; however, the unit price is based on underlying investments which are traded on an active market.

We anticipate contributions to the Plan in 2019 to approximate net contribution costs.

The components of projected net periodic benefit cost are as follows for the year ending:

	December 31, 2019
Interest cost on projected benefit obligation	$	378
Expected return on plan assets	(452		)
Amortization of unrecognized actuarial net loss	214
Net periodic benefit cost	$	140

Estimated future benefit payments are as follows for the next ten years:

	Estimated Benefit Payments
2019	$	450
2020	486
2021	479
2022	481
2023	481
2024 - 2028	2,540

Directors Plan

Pursuant to the terms of the Directors Plan, our directors are required to invest at least 25% of their board fees in our common stock. These stock investments can be made either through deferred fees or through the purchase of shares through the Dividend Reinvestment Plan. Deferred fees, under the Directors Plan, are converted on a quarterly basis into stock units of our common stock based on the fair value of a share of our common stock as of the relevant valuation date. Stock units credited to a participant’s account are eligible for stock and cash dividends as declared. Dividend Reinvestment Plan shares are purchased pursuant to the Dividend Reinvestment Plan.

Distribution of deferred fees from the Directors Plan occurs when the participant retires from the Board or upon the occurrence of certain other events. The participant is eligible to receive a distribution in the form of shares of our common stock of all of the stock units that are then in his or her account, and any unconverted cash will be converted to and rounded up to whole shares of stock and distributed, as well. The Directors Plan does not allow for cash settlement, and therefore, such share-based payment awards qualify for classification as equity. We may use authorized but unissued shares or purchase shares of common stock on the open market to meet our obligations under the Directors Plan.

We maintain the Rabbi Trust to fund the Directors Plan. The Rabbi Trust is an irrevocable grantor trust to which we may contribute assets for the limited purpose of funding a nonqualified deferred compensation plan. Although we may not reach the assets of the Rabbi Trust for any purpose other than meeting our obligations under the Directors Plan, the assets of the Rabbi Trust remain subject to the claims of our creditors and are included in the consolidated financial statements. We may contribute cash or common stock to the Rabbi Trust from time-to-time for the sole purpose of funding the Directors Plan. The Rabbi Trust will use any cash that we contributed to purchase shares of our common stock on the open market through our Investment and Trust Services department. Shares held in the Rabbi Trust are included in the calculation of earnings per share.

The components of shares eligible to be issued under the Directors Plan were as follows as of December 31:

	2018			2017
	Eligible Shares	Market Value		Eligible Shares	Market Value
Unissued	203,498	$	4,591	195,140	$	5,513
Shares held in Rabbi Trust	16,673	376		31,769	897
Total	220,171	$	4,967	226,909	$	6,410

Stock Award Incentive Plan

We maintain an equity incentive plan for the purpose of promoting growth and profitability, as well as attracting and retaining executive officers of outstanding competence, through ownership of equity. Stock may be granted to specified individuals subject to certain conditions, and transfer of shares granted under the plan is restricted. Expenses related to this plan for 2018, 2017 and 2016 were $45, $38, and $70, respectively.

Other Employee Benefit Plans

We maintain nonqualified defined contribution retirement plans to provide supplemental retirement benefits to specified participants. Expenses related to these programs for 2018, 2017 and 2016 were $356, $473, and $440, respectively. Expenses are recognized over the participants’ expected years of service.

We maintained a non-leveraged ESOP which was frozen to new participants on December 31, 2006. Contributions to the plan were discretionary and were approved by the Board of Directors and recorded as compensation expense. We made no contributions to the ESOP in 2018, 2017 and 2016. Compensation costs related to the plan for 2018, 2017 and 2016 were $21, $23, and $33, respectively. Total allocated shares outstanding related to the ESOP at December 31, 2018, 2017, and 2016 were 0, 166,833, and 204,669, respectively. Such shares are included in the computation of dividends and earnings per share in each of the respective years. On December 21, 2016, the Board approved the termination of the ESOP effective December 31, 2016. Actual dissolution of the ESOP occurred in 2018.

We maintain a self-funded medical plan under which we are responsible for the first $75 per year of claims made by a covered family. Expenses are accrued based on estimates of the aggregate liability for claims incurred and our experience. Expenses were $2,695 in 2018, $2,324 in 2017 and $2,150 in 2016.

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Revenue (Notes)

12 Months Ended

Dec. 31, 2018

Revenue from Contract with Customer [Abstract]

Revenue from Contract with Customer [Text Block]

Revenue

Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities, earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of investment and trust advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation.

We record receivables when revenue is unpaid and collectability is reasonably assured. Accounts receivable balances primarily represent amounts due from customers for which revenue has been recognized. Accounts receivable balances are recorded in the consolidated balance sheets in accrued interest receivable and other assets. For the years ended December 31, 2018, 2017 and 2016 we satisfied our performance obligations pursuant to contracts with customers. As a result, we have not recorded any contract assets or liabilities. We estimate no returns or allowances for the years ended December 31, 2018, 2017 and 2016.

Our contracts with customers define our performance obligations with clearly established pricing which did not require us to allocate or disaggregate revenue by performance obligation. A summary of revenue recognized for each major category of contracts with customers, subject to ASC 606, is as follows for the years ended December 31:

	2018		2017		2016
Debit card income	$	2,487	$	2,435	$	2,131
Trust service fees	2,134		1,928		2,089
Investment advisory fees	702		679		616
Service charges and fees related to deposit accounts	332		343		349
Total	$	5,655	$	5,385	$	5,185

A large portion of our revenue consists of interest income which is not subject to the requirements set forth in ASC 606. This recently adopted guidance required us to review our other noninterest revenue sources within the scope of the guidance to ensure appropriate recognition of revenue from contracts with customers. This review process did not identify significant changes related to revenue recognition. As such, we did not record or disclose transactions related to the adoption of this guidance.

Disaggregation of Revenue [Table Text Block]

A summary of revenue recognized for each major category of contracts with customers, subject to ASC 606, is as follows for the years ended December 31:

	2018		2017		2016
Debit card income	$	2,487	$	2,435	$	2,131
Trust service fees	2,134		1,928		2,089
Investment advisory fees	702		679		616
Service charges and fees related to deposit accounts	332		343		349
Total	$	5,655	$	5,385	$	5,185

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Other Noninterest Expenses

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Other Noninterest Expenses

Other Noninterest Expenses

A summary of expenses included in other noninterest expenses is as follows for the years ended December 31:

	2018		2017		2016
Audit, consulting, and legal fees	$	2,263	$	2,043	$	1,952
ATM and debit card fees	1,036		1,181		887
Loan underwriting fees	1,016		556		535
Director fees	858		856		851
FDIC insurance premiums	726		642		719
Donations and community relations	710		657		582
Marketing costs	596		568		586
OTTI on AFS securities	—		—		770
All other	3,558		3,541		3,343
Total other	$	10,763	$	10,044	$	10,225

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Federal Income Taxes

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Federal Income Taxes

Federal Income Taxes

Components of the consolidated provision for federal income taxes are as follows for the years ended December 31:

	2018		2017		2016
Currently payable	$	1,088	$	180	$	2,630
Deferred expense (benefit)	275		2,836		(282		)
Income tax expense	$	1,363	$	3,016	$	2,348

In 2017 we implemented tax strategies which resulted in changes to our federal income tax components, as illustrated above. These strategies, which were primarily related to premises and equipment, significantly decreased our taxes currently payable and led to an increase in our level of alternative minimum tax. Changes in these deferred tax components are displayed in the deferred tax assets and liabilities table on the following page.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21% and eliminated the corporate alternative minimum tax which can be carried forward and used to reduce future income tax. The tax law provided for a wide array of changes, only some of which had a direct impact on our federal income tax expense. Some of these changes included, but are not limited to, the following items: limits to the deduction for net interest expense; immediate expense (for tax purposes) for certain qualified depreciable assets; elimination or reduction of certain deductions related to meals and entertainment expenses; and limits to the deductibility of deposit insurance premiums.

In accordance with ASC 740, Income Taxes, the effect of income tax law changes on deferred taxes are recognized as a component of income tax expense related to continuing operations in the period in which the law was enacted. As such, federal income tax expense for the year ended December 31, 2017 reflects the effect of the tax rate change on net deferred tax assets and liabilities. This requirement also applies to items initially recognized in other comprehensive income. In January 2018, FASB issued ASU 2018-02 which allowed for the "stranded" tax effects in AOCI to be reclassified to retained earnings rather than income tax expense. We early adopted this guidance and applied this accounting alternative in our consolidated statements of changes in shareholders equity as of December 31, 2017.

The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense is as follows for the year ended December 31:

	2018			2017			2016
Income taxes at statutory rate (21% in 2018 and 34% in 2017 and 2016)	$	3,231		$	5,526		$	5,490
Effect of nontaxable income
Interest income on tax exempt municipal securities	(1,106		)	(1,889		)	(1,938		)
Earnings on corporate owned life insurance policies	(148		)	(247		)	(419		)
Deferred tax adjustment resulting from the statutory rate reduction pursuant to the Tax Act	—			319			—
Other	231			34			(154		)
Total effect of nontaxable income	(1,023		)	(1,783		)	(2,511		)
Effect of nondeductible expenses	113			149			143
Effect of tax credits	(958		)	(876		)	(774		)
Federal income tax expense	$	1,363		$	3,016		$	2,348

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for federal income tax purposes. Significant components of our deferred tax assets and liabilities, measured at the 21% statutory rate, included in other assets in the accompanying consolidated balance sheets, are as follows as of December 31:

	2018		2017
Deferred tax assets
Allowance for loan losses	$	1,304	$	1,076
Deferred directors’ fees	1,667		1,758
Employee benefit plans	81		70
Core deposit premium and acquisition expenses	752		733
Net unrecognized actuarial losses on pension plan	729		857
Net unrealized losses on available-for-sale securities	1,211		—
Life insurance death benefit payable	497		497
Alternative minimum tax	710		1,463
Other	716		607
Total deferred tax assets	7,667		7,061
Deferred tax liabilities
Prepaid pension cost	383		455
Premises and equipment	1,548		1,728
Accretion on securities	41		40
Core deposit premium and acquisition expenses	946		909
Net unrealized gains on available-for-sale securities	—		204
Net unrealized gains on derivative instruments	68		61
Other	1,696		1,684
Total deferred tax liabilities	4,682		5,081
Net deferred tax assets	$	2,985	$	1,980

We are subject to U.S. federal income tax; however, we are no longer subject to examination by taxing authorities for years before 2015. There are no material uncertain tax positions requiring recognition in our consolidated financial statements. We do not expect the total amount of unrecognized tax benefits to significantly increase in the next twelve months.

We recognize interest and/or penalties related to income tax matters in income tax expense. We do not have any amounts accrued for interest and penalties at December 31, 2018 and 2017 and we are not aware of any claims for such amounts by federal income tax authorities.

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Accumulated Other Comprehensive Income (Loss)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)

Accumulated Other Comprehensive Income (Loss)

AOCI includes net income as well as unrealized gains and losses, net of tax, on AFS securities and derivative instruments, as well as changes in the funded status of our defined benefit pension plan. Unrealized gains and losses and changes in the funded status of the pension plan, net of tax, are excluded from net income, and are reflected as a direct charge or credit to shareholders’ equity. Comprehensive income (loss) and the related components are disclosed in the consolidated statements of comprehensive income.

The following table provides a roll-forward of the changes in AOCI by component for the years ended December 31, 2016, 2017 and 2018 (net of tax):

	Unrealized Holding Gains (Losses) on AFS Securities			Unrealized Gains (Losses) on Derivative Instruments			Change in Unrecognized Pension Cost on Defined Benefit Pension Plan			Total
Balance, January 1, 2016	$	3,536		$	—		$	(3,315	)	$	221
OCI before reclassifications	(5,865		)	248			282			(5,335		)
Amounts reclassified from AOCI	525			—			238			763
Subtotal	(5,340		)	248			520			(4,572		)
Tax effect	1,834			(84		)	(177		)	1,573
OCI, net of tax	(3,506		)	164			343			(2,999		)
Balance, December 31, 2016	30			164			(2,972		)	(2,778		)
OCI before reclassifications	289			43			11			343
Amounts reclassified from AOCI	(142		)	—			412			270
Subtotal	147			43			423			613
Tax effect	89			(15		)	(144		)	(70		)
OCI, net of tax	236			28			279			543
One-time non-cash tax rate adjustment due to the Tax Act	125			38			(530		)	(367		)
Balance, December 31, 2017	391			230			(3,223		)	(2,602		)
OCI before reclassifications	(7,229		)	33			265			(6,931		)
Amounts reclassified from AOCI	—			—			345			345
Subtotal	(7,229		)	33			610			(6,586		)
Tax effect	1,415			(7		)	(128		)	1,280
OCI, net of tax	(5,814		)	26			482			(5,306		)
Adoption of ASU 2016-01	223			—			—			223
Balance, December 31, 2018	$	(5,200	)	$	256		$	(2,741	)	$	(7,685	)

Included in OCI for the year ended December 31, 2018 are changes in unrealized holding gains and losses related to auction rate money market preferred stocks. These investments, for federal income tax purposes, have no deferred federal income taxes related to unrealized holding gains or losses given the nature of the investments.

In accordance with the Tax Act, the effect of income tax law changes on deferred taxes also applies to items recognized in other comprehensive income. In January 2018, FASB issued ASU 2018-02 which allowed for the "stranded" tax effects in AOCI to be reclassified to retained earnings rather than income tax expense. We early adopted this guidance and applied this accounting alternative in our consolidated statements of changes in shareholders equity as of December 31, 2017.

A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the years ended December 31:

	2018									2017								2016
	Auction Rate Money Market Preferred Stocks			All Other AFS Securities			Total			Auction Rate Money Market Preferred Stocks		All Other AFS Securities			Total			Auction Rate Money Market Preferred and Preferred Stocks		All Other AFS securities			Total
Unrealized gains (losses) arising during the period	$	(495	)	$	(6,734	)	$	(7,229	)	$	407	$	(118	)	$	289		$	54	$	(5,919	)	$	(5,865	)
Reclassification adjustment for net (gains) losses included in net income	—			—			—			—		(142		)	(142		)	—		(245		)	(245		)
Reclassification adjustment for impairment loss included in net income	—			—			—			—		—			—			—		770			770
Net unrealized gains (losses)	(495		)	(6,734		)	(7,229		)	407		(260		)	147			54		(5,394		)	(5,340		)
Tax effect (1)	—			1,415			1,415			—		89			89			—		1,834			1,834
Unrealized gains (losses), net of tax	$	(495	)	$	(5,319	)	$	(5,814	)	$	407	$	(171	)	$	236		$	54	$	(3,560	)	$	(3,506	)

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

The following table details reclassification adjustments and the related affected line items in our consolidated statements of income for the years ended December 31:

Details about AOCI components	Amount Reclassified from AOCI							Affected Line Item in the Consolidated Statements of Income
	2018		2017		2016
Unrealized holding gains (losses) on AFS securities
	$	—	$	142	$	245		Net gains on sale of AFS securities
	—		—		(770		)	Other noninterest expenses
	—		142		(525		)	Income before federal income tax expense
	—		48		(179		)	Federal income tax expense (benefit) (1)
	$	—	$	94	$	(346	)	Net income
Change in unrecognized pension cost on defined benefit pension plan
	$	345	$	412	$	238		Other noninterest expenses
	72		140		81			Federal income tax expense (1)
	$	273	$	272	$	157		Net income

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

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Fair Value

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.

Following is a description of the valuation methodologies, key inputs, and an indication of the level of the fair value hierarchy in which the assets or liabilities are classified.

AFS securities:AFS securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. Level 2 fair value measurement is based upon quoted prices for similar instruments. If quoted prices are not available, fair values are measured using independent pricing models or other model based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss and liquidity assumptions. The values for Level 1 and Level 2 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources.

Equity securities, at fair value: Equity securities are recorded at fair value on a recurring basis. Level 1 fair value measurement is based upon quoted prices for identical instruments. The values for Level 1 investment securities are generally obtained from an independent third party. On a quarterly basis, we compare the values provided to alternative pricing sources.

Loans: We do not record loans at fair value on a recurring basis. However, from time-to-time, loans are classified as impaired and a specific allowance for loan losses may be established. Loans for which it is probable that payment of interest and principal will be significantly different than the contractual terms of the original loan agreement are considered impaired. Once a loan is identified as impaired, we measure the estimated impairment. The fair value of impaired loans is estimated using one of several methods, including the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less costs to sell, if the loan is collateral dependent. Those impaired loans not requiring an allowance represent loans for which the fair value of the expected repayments or collateral exceed the recorded investments in such loans.

We review the net realizable values of the underlying collateral for collateral dependent impaired loans on at least a quarterly basis for all loan types.  To determine the collateral value, we utilize independent appraisals, broker price opinions, or internal evaluations.  We review these valuations to determine whether an additional discount should be applied given the age of market information that may have been considered as well as other factors such as costs to sell an asset if it is determined that the collateral will be liquidated in connection with the ultimate settlement of the loan. We use these valuations to determine if any specific reserves or charge-offs are necessary. We may obtain new valuations in certain circumstances, including when there has been significant deterioration in the condition of the collateral, if the foreclosure process has begun, or if the existing valuation is deemed to be outdated.

The following tables list the quantitative fair value information about impaired loans as of:

	December 31, 2018
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 40%
		Cash crop inventory	30% - 40%
Discounted value	$20,045	Livestock	30%
		Other inventory	45% - 50%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

	December 31, 2017
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 35%
		Cash crop inventory	30% - 40%
Discounted value	$15,956	Livestock	30%
		Other inventory	50% - 75%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

Collateral discount rates may have ranges to accommodate differences in the age of the independent appraisal, broker price opinion, or internal evaluation.

Derivative instruments: Derivative instruments, consisting solely of interest rate swaps, are recorded at fair value on a recurring basis. Derivatives qualifying as cash flow hedges, when highly effective, are reported at fair value in other assets or other liabilities on our Consolidated Balance Sheets with changes in value recorded in OCI. Should the hedge no longer be considered effective, the ineffective portion of the change in fair value is recorded directly in earnings in the period in which the change occurs. The fair value of a derivative is determined by quoted market prices and model-based valuation techniques. As such, we classify derivative instruments as Level 2.

The preceding methods described may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. Although we believe our valuation methods are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different fair value measurement.

Estimated Fair Values of Financial Instruments Not Recorded at Fair Value in their Entirety on a Recurring Basis

Disclosure of the estimated fair values of financial instruments, which differs from carrying values, often requires the use of estimates. In cases where quoted market values in an active market are not available, we use present value techniques and other valuation methods to estimate the fair values of our financial instruments. These valuation methods require considerable judgment and the resulting estimates of fair value can be significantly affected by the assumptions made and methods used.

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis were as follows as of December 31:

	2018
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	73,471	$	73,471	$	73,471	$	—	$	—
Mortgage loans AFS	358		365		—		365		—
Gross loans	1,128,707		1,099,645		—		—		1,099,645
Less allowance for loan and lease losses	8,375		8,375		—		—		8,375
Net loans	1,120,332		1,091,270		—		—		1,091,270
Accrued interest receivable	6,928		6,928		6,928		—		—
Equity securities without readily determinable fair values (1)	24,948		N/A		—		—		—
OMSR	2,434		2,602		—		2,602		—
LIABILITIES
Deposits without stated maturities	859,073		859,073		859,073		—		—
Deposits with stated maturities	433,620		425,993		—		425,993		—
Borrowed funds	340,299		333,829		—		333,829		—
Accrued interest payable	826		826		826		—		—

	2017
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	30,848	$	30,848	$	30,848	$	—	$	—
Mortgage loans AFS	1,560		1,587		—		1,587		—
Gross loans	1,091,519		1,056,906		—		—		1,056,906
Less allowance for loan and lease losses	7,700		7,700		—		—		7,700
Net loans	1,083,819		1,049,206		—		—		1,049,206
Accrued interest receivable	7,063		7,063		7,063		—		—
Equity securities without readily determinable fair values (1)	23,454		N/A		—		—		—
OMSR	2,409		2,409		—		2,409		—
LIABILITIES
Deposits without stated maturities	811,992		811,992		811,992		—		—
Deposits with stated maturities	453,266		443,892		—		443,892		—
Borrowed funds	344,878		342,089		—		342,089		—
Accrued interest payable	680		680		680		—		—

⁽¹⁾ Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment.

Financial Instruments Recorded at Fair Value

The table below presents the recorded amount of assets and liabilities measured at fair value on December 31:

	2018											2017
	Total		Level 1			Level 2			Level 3			Total		Level 1			Level 2			Level 3
Recurring items
AFS securities
Government-sponsored enterprises	$	170	$	—		$	170		$	—		$	216	$	—		$	216		$	—
States and political subdivisions	190,866		—			190,866			—			208,474		—			208,474			—
Auction rate money market preferred	2,554		—			2,554			—			3,049		—			3,049			—
Mortgage-backed securities	184,484		—			184,484			—			208,797		—			208,797			—
Collateralized mortgage obligations	116,760		—			116,760			—			128,194		—			128,194			—
Total AFS securities	494,834		—			494,834			—			548,730		—			548,730			—
Equity securities	—		—			—			—			3,577		3,577			—			—
Derivative instruments	323		—			323			—			291		—			291			—
Nonrecurring items
Impaired loans (net of the ALLL)	20,045		—			—			20,045			15,956		—			—			15,956
Total	$	515,202	$	—		$	495,157		$	20,045		$	568,554	$	3,577		$	549,021		$	15,956
Percent of assets and liabilities measured at fair value			—		%	96.11		%	3.89		%			0.63		%	96.56		%	2.81		%

Equity securities are recorded at fair value with changes in fair value recognized through earnings on a recurring basis. For the year ended December 31, 2018, we recorded a loss of $41 through earnings. We had no other assets or liabilities recorded at fair value with changes in fair value recognized through earnings, on a recurring basis or nonrecurring basis, as of December 31, 2018.

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Related Party Transactions

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

Related Party Transactions

Related Party Transactions

In the ordinary course of business, we grant loans to principal officers and directors and their affiliates (including their families and companies in which they have 10% or more ownership). Annual activity consisted of the following for the years ended December 31:

	2018			2017
Balance, January 1	$	4,335		$	3,946
New loans	1,184			3,895
Repayments	(2,176		)	(3,506		)
Balance, December 31	$	3,343		$	4,335

Total deposits of these principal officers and directors and their affiliates amounted to $5,029 and $5,671 at December 31, 2018 and 2017, respectively. In addition, the ESOP held deposits with the Bank aggregating $266 at December 31, 2017. No deposits were held as of December 31, 2018 due to the dissolution of the ESOP during 2018.

From time-to-time, we make charitable donations to The Isabella Bank Foundation (the “Foundation”), which is a non-controlled nonprofit organization formed for the purpose of distributing charitable donations to recipient organizations generally located in the communities we serve. Our donations are expensed when committed to the Foundation. The assets and transactions of the Foundation are not included in our consolidated financial statements.

Assets of the Foundation include cash and cash equivalents, certificates of deposit, and shares of Isabella Bank Corporation common stock. The Foundation owned 44,350 shares of our common stock as of December 31, 2018 and 2017, respectively. Such shares are included in the computation of dividends and earnings per share.

We did not make donations to the Foundation for the years ended December 31, 2018, 2017 and 2016. The following table displays total asset balances of the Foundation as of December 31:

	2018		2017		2016
Total assets	$	1,731	$	2,162	$	2,213

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Operating Segments

12 Months Ended

Dec. 31, 2018

Segment Reporting [Abstract]

Operating Segments

Operating Segments

Our reportable segments are based on legal entities that account for at least 10% of net operating results. The operations of the Bank as of December 31, 2018, 2017, and 2016 represent approximately 90% or more of our consolidated total assets and operating results. As such, no additional segment reporting is presented.

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Parent Company Only Financial Information

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Parent Company Only Financial Information

Parent Company Only Financial Information

Condensed Balance Sheets

	December 31
	2018		2017
ASSETS
Cash on deposit at the Bank	$	2,499	$	185
Investments in subsidiaries	143,942		145,962
Premises and equipment	1,912		1,950
Other assets	51,674		52,253
TOTAL ASSETS	$	200,027	$	200,350
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other liabilities	$	4,508	$	5,445
Shareholders' equity	195,519		194,905
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	200,027	$	200,350

Condensed Statements of Income

	Year Ended December 31
	2018		2017		2016
Income
Dividends from subsidiaries	$	13,100	$	9,600	$	7,400
Interest income	1		2		14
Management fee and other	3,030		6,463		6,574
Total income	16,131		16,065		13,988
Expenses
Compensation and benefits	4,132		5,196		4,898
Occupancy and equipment	513		1,779		1,696
Audit and related fees	368		527		536
Other	1,615		2,566		2,120
Total expenses	6,628		10,068		9,250
Income before income tax benefit and equity in undistributed earnings of subsidiaries	9,503		5,997		4,738
Federal income tax benefit	749		91		1,058
Income before equity in undistributed earnings of subsidiaries	10,252		6,088		5,796
Undistributed earnings of subsidiaries	3,769		7,149		8,003
Net income	$	14,021	$	13,237	$	13,799

Condensed Statements of Cash Flows

	Year Ended December 31
	2018			2017			2016
Operating activities
Net income	$	14,021		$	13,237		$	13,799
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries	(3,769		)	(7,149		)	(8,003		)
Undistributed earnings of equity securities without readily determinable fair values	(144		)	40			791
Share-based payment awards under equity compensation plan	612			640			573
Depreciation	134			154			156
Deferred income tax expense (benefit)	(31		)	792			147
Changes in operating assets and liabilities which provided (used) cash
Other assets	1,237			42			(44		)
Accrued interest and other liabilities	(937		)	(1,590		)	(2,669		)
Net cash provided by (used in) operating activities	11,123			6,166			4,750
Investing activities
Maturities, calls, principal payments, and sales of AFS securities	—			249			—
Sales (purchases) of premises and equipment	(96		)	(113		)	(133		)
Net cash provided by (used in) investing activities	(96		)	136			(133		)
Financing activities
Net increase (decrease) in borrowed funds	—			—			—
Cash dividends paid on common stock	(8,169		)	(7,990		)	(7,645		)
Proceeds from the issuance of common stock	6,864			6,177			5,023
Common stock repurchased	(7,007		)	(5,181		)	(4,440		)
Common stock purchased for deferred compensation obligations	(401		)	(420		)	(383		)
Net cash provided by (used in) financing activities	(8,713		)	(7,414		)	(7,445		)
Increase (decrease) in cash and cash equivalents	2,314			(1,112		)	(2,828		)
Cash and cash equivalents at beginning of period	185			1,297			4,125
Cash and cash equivalents at end of period	$	2,499		$	185		$	1,297

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Nature of Operations and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

BASIS OF PRESENTATION AND CONSOLIDATION

BASIS OF PRESENTATION AND CONSOLIDATION: The consolidated financial statements include the accounts of Isabella Bank Corporation, a financial services holding company, and its wholly owned subsidiary, Isabella Bank. All intercompany balances and accounts have been eliminated in consolidation.

USE OF ESTIMATES

USE OF ESTIMATES: In preparing consolidated financial statements in conformity with accounting principles generally accepted in the United States of America, we make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the consolidated balance sheet and reported amounts of revenues and expenses during the reporting year. Actual results could differ from those estimates.

Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the ALLL, the fair value of AFS investment securities, and the valuation of goodwill and other intangible assets.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS: Fair value refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data. We may choose to measure eligible items at fair value at specified election dates.

For assets and liabilities recorded at fair value, it is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements for those financial instruments for which there is an active market. In cases where the market for a financial asset or liability is not active, we include appropriate risk adjustments that market participants would make for nonperformance and liquidity risks when developing fair value measurements. Fair value measurements for assets and liabilities for which limited or no observable market data exists are accordingly based primarily upon estimates, are often calculated based on the economic and competitive environment, the characteristics of the asset or liability and other factors. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values.

We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Investment securities AFS and derivative instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as mortgage loans AFS, impaired loans, foreclosed assets, OMSR, goodwill, and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write downs of individual assets.

Fair Value Hierarchy

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

For further discussion of fair value considerations, refer to “Note 17 – Fair Value.”

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK

SIGNIFICANT GROUP CONCENTRATIONS OF CREDIT RISK: Most of our activities are conducted with customers located within the central Michigan area. A significant amount of our outstanding loans are secured by commercial and residential real estate. Other than these types of loans, there is no significant concentration to any other industry or any one customer.

Internally assigned credit risk ratings are reviewed, at a minimum, when loans are renewed or when management has knowledge of improvements or deterioration of the credit quality of individual credits. Descriptions of the internally assigned credit risk ratings for commercial and agricultural loans are as follows:

1. EXCELLENT – Substantially Risk Free

Credit has strong financial condition and solid earnings history, characterized by:

• High liquidity, strong cash flow, low leverage.

• Unquestioned ability to meet all obligations when due.

• Experienced management, with management succession in place.

• Secured by cash.

2. HIGH QUALITY – Limited Risk

Credit with sound financial condition and a positive trend in earnings supplemented by:

• Favorable liquidity and leverage ratios.

• Ability to meet all obligations when due.

• Management with successful track record.

• Steady and satisfactory earnings history.

• If loan is secured, collateral is of high quality and readily marketable.

• Access to alternative financing.

• Well defined primary and secondary source of repayment.

• If supported by guaranty, the financial strength and liquidity of the guarantor(s) are clearly evident.

3.HIGH SATISFACTORY – Reasonable Risk

Credit with satisfactory financial condition and further characterized by:

• Working capital adequate to support operations.

• Cash flow sufficient to pay debts as scheduled.

• Management experience and depth appear favorable.

• Loan performing according to terms.

• If loan is secured, collateral is acceptable and loan is fully protected.

4. LOW SATISFACTORY – Acceptable Risk

Credit with bankable risks, although some signs of weaknesses are shown:

• Would include most start-up businesses.

• Occasional instances of trade slowness or repayment delinquency – may have been 10-30 days slow within the past year.

• Management’s abilities are apparent yet unproven.

• Weakness in primary source of repayment with adequate secondary source of repayment.

• Loan structure generally in accordance with policy.

• If secured, loan collateral coverage is marginal.

To be classified as less than satisfactory, only one of the following criteria must be met.

5. SPECIAL MENTION – Criticized

Credit constitutes an undue and unwarranted credit risk but not to the point of justifying a classification of substandard. The credit risk may be relatively minor yet constitutes an unwarranted risk in light of the circumstances surrounding a specific loan:

• Downward trend in sales, profit levels, and margins.

• Impaired working capital position.

• Cash flow is strained in order to meet debt repayment.

• Loan delinquency (30-60 days) and overdrafts may occur.

• Shrinking equity cushion.

• Diminishing primary source of repayment and questionable secondary source.

• Management abilities are questionable.

• Weak industry conditions.

• Litigation pending against the borrower.

• Loan may need to be restructured to improve collateral position or reduce payments.

• Collateral or guaranty offers limited protection.

• Negative debt service coverage, however the credit is well collateralized and payments are current.

6. SUBSTANDARD – Classified

Credit is inadequately protected by the current net worth and paying capacity of the borrower or of the collateral pledged. There is a distinct possibility we will implement collection procedures if the loan deficiencies are not corrected. Any commercial loan placed in nonaccrual status will be rated "7" or worse. In addition, the following characteristics may apply:

• Sustained losses have severely eroded the equity and cash flow.

• Deteriorating liquidity.

• Serious management problems or internal fraud.

• Original repayment terms liberalized.

• Likelihood of bankruptcy.

• Inability to access other funding sources.

• Reliance on secondary source of repayment.

• Litigation filed against borrower.

• Interest non-accrual may be warranted.

• Collateral provides little or no value.

• Requires excessive attention of the loan officer.

• Borrower is uncooperative with loan officer.

7.VULNERABLE – Classified

Credit is considered “Substandard” and warrants placing in nonaccrual status. Risk of loss is being evaluated and exit strategy options are under review. Other characteristics that may apply:

• Insufficient cash flow to service debt.

• Minimal or no payments being received.

• Limited options available to avoid the collection process.

• Transition status, expect action will take place to collect loan without immediate progress being made.

8. DOUBTFUL – Workout

Credit has all the weaknesses inherent in a “Substandard” loan with the added characteristic that collection and/or liquidation is pending. The possibility of a loss is extremely high, but its classification as a loss is deferred until liquidation procedures are completed, or reasonably estimable. Other characteristics that may apply:

• Normal operations are severely diminished or have ceased.

• Seriously impaired cash flow.

• Original repayment terms materially altered.

• Secondary source of repayment is inadequate.

• Survivability as a “going concern” is impossible.

• Collection process has begun.

• Bankruptcy petition has been filed.

• Judgments have been filed.

• Portion of the loan balance has been charged-off.

9. LOSS – Charge-off

Credit is considered uncollectible and of such little value that their continuance as bankable assets is not warranted. This classification is for charged-off loans but does not mean that the asset has absolutely no recovery or salvage value. These loans are further characterized by:

• Liquidation or reorganization under Bankruptcy, with poor prospects of collection.

• Fraudulently overstated assets and/or earnings.

• Collateral has marginal or no value.

• Debtor cannot be located.

• Over 120 days delinquent.

CASH AND CASH EQUIVALENTS

CASH AND CASH EQUIVALENTS: For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash and balances due from banks, federal funds sold, and other deposit accounts. Generally, federal funds sold are for a one day period. We maintain deposit accounts in various financial institutions which generally exceed federally insured limits or are not insured. We do not believe we are exposed to any significant interest, credit or other financial risk as a result of these deposits.

AFS SECURITIES

AFS SECURITIES: Purchases of investment securities are generally classified as AFS. However, we may elect to classify securities as either held to maturity or trading. Securities classified as AFS debt securities are recorded at fair value, with unrealized gains and losses, net of the effect of deferred income taxes, excluded from earnings and reported in other comprehensive income. Included in AFS securities are auction rate money market preferred securities. These investments, for federal income tax purposes, have no federal income tax impact given the nature of the investments. Auction rate money market preferred securities and preferred stocks are recorded at fair value, with unrealized gains and losses excluded from earnings and reported in other comprehensive income. Purchase premiums and discounts are recognized in interest income using the interest method over the term of the securities. Realized gains and losses on the sale of AFS securities are determined using the specific identification method.

AFS securities are reviewed quarterly for possible OTTI. In determining whether an OTTI exists for debt securities, we assert that: (a) we do not have the intent to sell the security; and (b) it is more likely than not we will not have to sell the security before recovery of its cost basis. If these conditions are not met, we recognize an OTTI charge through earnings for the difference between the debt security’s amortized cost basis and its fair value, and such amount is included in noninterest income. For debt securities that do not meet the above criteria, and we do not expect to recover the security’s amortized cost basis, the security is considered other-than-temporarily impaired. For these debt securities, we separate the total impairment into the credit risk loss component and the amount of the loss related to market and other risk factors. In order to determine the amount of the credit loss for a debt security, we calculate the recovery value by performing a discounted cash flow analysis based on the current cash flows and future cash flows we expect to recover. The amount of the total OTTI related to the credit risk is recognized in earnings and is included in noninterest income. The amount of the total OTTI related to other risk factors is recognized as a component of other comprehensive income. For debt securities that have recognized OTTI through earnings, if through subsequent evaluation there is a significant increase in the cash flow expected, the difference between the amortized cost basis and the cash flows expected to be collected is accreted as interest income.

AFS equity securities are reviewed for OTTI at each reporting date. This evaluation considers a number of factors including, but not limited to, the length of time and extent to which the fair value has been less than cost, the financial condition and near term prospects of the issuer, and our ability and intent to hold the securities until fair value recovers. If it is determined that we do not have the ability and intent to hold the securities until recovery or that there are conditions that indicate that a security may not recover in value then the difference between the fair value and the cost of the security is recognized in earnings and is included in noninterest income.

As of December 31, 2018 and 2017, we conducted an analysis to determine whether any securities currently in an unrealized loss position should be identified as other-than-temporarily impaired. Such analyses considered, among other factors, the following criteria:

• Has the value of the investment declined more than what is deemed to be reasonable based on a risk and maturity adjusted discount rate?

• Is the investment credit rating below investment grade?

• Is it probable the issuer will be unable to pay the amount when due?

• Is it more likely than not that we will have to sell the security before recovery of its cost basis?

• Has the duration of the investment been extended?

LOANS

LOANS: Loans that we have the intent and ability to hold for the foreseeable future or until maturity or payoff are reported at their outstanding principal balance adjusted for any charge-offs, the ALLL, and any deferred fees or costs on originated loans. Interest income on loans is accrued over the term of the loan based on the principal amount outstanding. Loan origination fees and certain direct loan origination costs are capitalized and recognized as a component of interest income over the term of the loan using the appropriate yield methods.

The accrual of interest on agricultural, commercial and mortgage loans is discontinued at the time the loan is 90 days or more past due unless the credit is well secured and in the process of collection. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual or charged-off at an earlier date if collection of principal or interest is considered doubtful. For loans that are placed on nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected is charged against the ALLL. Interest income on loans in nonaccrual status is not recognized until qualifying for return to accrual status. Loans are returned to accrual status when all principal and interest amounts contractually due are brought current and future payments are reasonably assured. For impaired loans not classified as nonaccrual, interest income continues to be accrued over the term of the loan based on the principal amount outstanding.

Commercial and agricultural loans include loans for commercial real estate, commercial operating loans, advances to mortgage brokers, farmland and agricultural production, and loans to states and political subdivisions. Repayment of these loans is dependent upon the successful operation and management of a business. We minimize our risk by limiting the amount of direct credit exposure to any one borrower to $15,000. Borrowers with direct credit needs of more than $15,000 may be serviced through the use of loan participations with other commercial banks. Commercial and agricultural real estate loans commonly require loan-to-value limits of 80% or less. Depending upon the type of loan, past credit history, and current operating results, we may require the borrower to pledge accounts receivable, inventory, property, or equipment. Personal guarantees are generally required from the owners of closely held corporations, partnerships, and sole proprietorships. In addition, we may require annual financial statements, prepare cash flow analyses, and review credit reports.

We entered into a mortgage purchase program in 2016 with a financial institution where we participate in advances to mortgage brokers ("advances"). The mortgage brokers originate residential mortgage loans with the intent to sell them on the secondary market. We participate in the advance to the mortgage broker, which is secured by the underlying mortgage loan, until it is ultimately sold on the secondary market. As such, the average life of each participated advance is approximately 20-30 days. Funds from the sale of the loan are used to pay off our participation in the advance to the mortgage broker. We classify these advances as commercial loans and include the outstanding balance in commercial loans on our consolidated balance sheet. Under the participation agreement, we committed to a maximum outstanding aggregate amount of $30,000. The difference between our outstanding balance and the maximum outstanding aggregate amount is classified as “Unfunded commitments under lines of credit” in the “Contractual Obligations and Loan Commitments” section of the Management's Discussion and Analysis of Financial Condition and Results of Operations of this report.

We offer adjustable rate mortgages, construction loans, and fixed rate residential real estate loans which have amortization periods up to a maximum of 30 years. We consider the anticipated direction of interest rates, balance sheet duration, the sensitivity of our balance sheet to changes in interest rates, our liquidity needs, and overall loan demand to determine whether or not to sell fixed rate loans to Freddie Mac.

Our lending policies generally limit the maximum loan-to-value ratio on residential real estate loans to 100% of the lower of the appraised value of the property or the purchase price. Private mortgage insurance is typically required on loans with loan-to-value ratios in excess of 80% unless the loan qualifies for government guarantees.

Underwriting criteria for residential real estate loans generally include:

• Evaluation of the borrower’s ability to make monthly payments.

• Evaluation of the value of the property securing the loan.

• Ensuring the payment of principal, interest, taxes, and hazard insurance does not exceed 28% of a borrower’s gross income.

• Ensuring all debt servicing does not exceed 40% of income.

• Verification of acceptable credit reports.

• Verification of employment, income, and financial information.

Appraisals are performed by independent appraisers and reviewed for appropriateness. Generally, mortgage loan requests are reviewed by our mortgage loan committee or through a secondary market underwriting system; loans in excess of $1,000 require the approval of our Internal Loan Committee, the Executive Loan Committee, the Board of Directors’ Loan Committee, or the Board of Directors.

Consumer loans include secured and unsecured personal loans. Loans are amortized for a period of up to 15 years based on the age and value of the underlying collateral. The underwriting emphasis is on a borrower’s perceived intent and ability to pay rather than collateral value. No consumer loans are sold to the secondary market.

ALLOWANCE FOR LOAN LOSSES

ALLOWANCE FOR LOAN AND LEASE LOSSES: The ALLL is established as losses are estimated to have occurred through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when we believe the uncollectability of the loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance.

We evaluate the ALLL on a regular basis. Our periodic review of the collectability of loans considers historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.

The ALLL consists of specific, general, and unallocated components. The specific component relates to loans that are deemed to be impaired. For such loans that are analyzed for specific allowance allocations, an allowance is established when the discounted cash flows, collateral value or observable market price of the impaired loan is lower than the carrying value of that loan. The general component covers non-impaired loans and is based on historical loss experience adjusted for current conditions. An unallocated component is maintained to cover uncertainties that we believe affect our estimate of probable losses based on qualitative factors. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance;

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller balance homogeneous loans are collectively evaluated for impairment.

The primary factors behind the determination of the level of the ALLL are specific allocations for impaired loans, historical loss percentages, as well as unallocated components. Specific allocations for impaired loans are primarily determined based on the difference between the loan’s outstanding balance and the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral, less cost to sell. Historical loss allocations are calculated at the loan class and segment levels based on a migration analysis of the loan portfolio, with the exception of advances to mortgage brokers, over the preceding five years. With no historical losses on advances to mortgage brokers, there is no allocation in the commercial segment displayed in the following tables. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio.

LOANS HELD FOR SALE

LOANS HELD FOR SALE: Mortgage loans held for sale on the secondary market are carried at the lower of cost or fair value as determined by aggregating outstanding commitments from investors or current investor yield requirements. Net unrealized losses, if any, would be recognized as a component of other noninterest expenses.

Mortgage loans held for sale are sold with the mortgage servicing rights retained by us. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.

TRANSFERS OF FINANCIAL ASSETS

TRANSFERS OF FINANCIAL ASSETS: Transfers of financial assets, including mortgage loans and participation loans, are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is determined to be surrendered when 1) the assets have been legally isolated from us, 2) the transferee obtains the right (free of conditions that constrain it from taking advantage of the right) to pledge or exchange the transferred assets, and 3) we do not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity. Other than servicing, we have no substantive continuing involvement related to these loans.

SERVICING

SERVICING: Servicing assets are recognized as separate assets when rights are acquired through purchase or through sale of financial assets. We have no purchased servicing rights. For sales of mortgage loans, a portion of the cost of originating the loan is allocated to the servicing right based on relative fair value. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses.

Servicing assets are evaluated for impairment based upon the fair value of the rights as compared to amortized cost. Impairment is determined by stratifying rights into tranches based on predominant risk characteristics, such as interest rate, loan type, and investor type. Impairment is recognized through a valuation allowance for an individual tranche, to the extent that fair value is less than the capitalized amount for the tranche. If we later determine that all or a portion of the impairment no longer exists for a particular tranche, a reduction of the valuation allowance may be recorded as an increase to income. Capitalized servicing rights are reported in other assets and are amortized into noninterest income in proportion to, and over the period of, the estimated future net servicing income of the underlying financial assets. The unpaid principal balance of mortgages serviced for others was $259,481 and $266,789 with capitalized servicing rights of $2,435 and $2,409 at December 31, 2018 and 2017, respectively.

Servicing fee income is recorded for fees earned for servicing loans for others. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. We recorded servicing fee revenue of $651, $671, and $696 related to residential mortgage loans serviced for others during 2018, 2017, and 2016, respectively, which is included in other noninterest income.

FORECLOSED ASSETS

FORECLOSED ASSETS: Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at the lower of our carrying amount or fair value less estimated selling costs at the date of transfer, establishing a new cost basis. Any write downs based on the asset’s fair value at the date of acquisition are charged to the ALLL. After foreclosure, property held for sale is carried at the lower of the new cost basis or fair value less costs to sell. Impairment losses on property to be held and used are measured at the amount by which the carrying amount of property exceeds its fair value. Costs relating to holding these assets are expensed as incurred. We periodically perform valuations and any subsequent write downs are recorded as a charge to operations, if necessary, to reduce the carrying value of a property to the lower of our carrying amount or fair value less costs to sell. Foreclosed assets of $355 and $291 as of December 31, 2018 and 2017, respectively, are included in other assets.

PREMISES AND EQUIPMENT

PREMISES AND EQUIPMENT: Land is carried at cost. Buildings and equipment are carried at cost, less accumulated depreciation which is computed principally by the straight-line method based upon the estimated useful lives of the related assets, which range from 3 to 40 years. Major improvements are capitalized and appropriately amortized based upon the useful lives of the related assets or the expected terms of the leases, if shorter, using the straight-line method. Maintenance, repairs and minor alterations are charged to current operations as expenditures occur. We annually review these assets to determine whether carrying values have been impaired.

EQUITY SECURITIES WITHOUT READILY DETERMINABLE FAIR VALUES

EQUITY SECURITIES WITHOUT READILY DETERMINABLE FAIR VALUES: Included in equity securities without readily determinable fair values are our holdings in FHLB stock and FRB stock as well as our ownership interest in Corporate Settlement Solutions, LLC. Our investment in Corporate Settlement Solutions, LLC, a title insurance company, was made in the 1st quarter of 2008. We are not the managing entity of Corporate Settlement Solutions, LLC, and account for our investment in that entity under the equity method of accounting.

Equity securities without readily determinable fair values consist of the following holdings as of December 31:

	2018		2017
FHLB Stock	$	15,050	$	13,700
Corporate Settlement Solutions, LLC	7,565		7,421
FRB Stock	1,999		1,999
Other	334		334
Total	$	24,948	$	23,454

EQUITY COMPENSATION PLAN

EQUITY COMPENSATION PLAN: At December 31, 2018, the Directors Plan had 220,171 shares eligible to be issued to participants, for which the Rabbi Trust held 16,673 shares. We had 226,909 shares to be issued at December 31, 2017, with 31,769 shares held in the Rabbi Trust. Compensation costs relating to share-based payment transactions are recognized as the services are rendered, with the cost measured based on the fair value of the equity or liability instruments issued (see “Note 12 – Benefit Plans”).

CORPORATE OWNED LIFE INSURANCE

CORPORATE OWNED LIFE INSURANCE: We have purchased life insurance policies on key members of management, partially for the purpose of funding certain post-retirement benefits. In the event of death of one of these individuals, we would receive a specified cash payment equal to the face value of the policy. Such policies are recorded at their cash surrender value, or the amount that can be realized on the balance sheet date. Increases in cash surrender value in excess of single premiums paid are reported as other noninterest income.

As of December 31, 2018 and 2017, the present value of the post retirement benefits payable by us to the covered insured participants was estimated to be $2,751 and $2,751, respectively, and is included in accrued interest payable and other liabilities. The expenses associated with these policies totaled $0, $577, and $(8) for 2018, 2017, and 2016, respectively.

ACQUISITION INTANGIBLES AND GOODWILL

ACQUISITION INTANGIBLES AND GOODWILL: We previously acquired branch facilities and related deposits in business combinations accounted for as a purchase. The acquisitions included amounts related to the valuation of customer deposit relationships (core deposit intangibles). Core deposit intangibles arising from acquisitions are included in goodwill and other intangible assets are being amortized over their estimated lives and evaluated for potential impairment on at least an annual basis. Goodwill, which represents the excess of the purchase price over identifiable assets, is not amortized but is evaluated for impairment on at least an annual basis. Acquisition intangibles and goodwill are typically qualitatively evaluated to determine if it is more likely than not that the carrying balance is impaired. If it is determined that the carrying balance is more likely than not to be impaired, we perform a cash flow valuation to determine the extent of the potential impairment. This valuation method requires a significant degree of our judgment. In the event the projected undiscounted net operating cash flows for these intangible assets are less than the carrying value, the asset is recorded at fair value as determined by the valuation model.

OFF BALANCE SHEET CREDIT RELATED FINANCIAL INSTRUMENTS

OFF BALANCE SHEET CREDIT RELATED FINANCIAL INSTRUMENTS: In the ordinary course of business, we have entered into commitments to extend credit, including commitments under credit card arrangements, commercial lines of credit, home equity lines of credit, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded only when funded.

Revenue Recognition, Policy [Policy Text Block]

REVENUE RECOGNITION: Our revenue is comprised primarily of interest income, service charges and fees, gains on the sale of loans and AFS securities, earnings on corporate owned life insurance policies, and other noninterest income. Other noninterest income is typically service and performance driven in nature and comprised primarily of investment and trust advisory fees. We recognize revenue, excluding interest income, in accordance with ASC 606, Revenue From Contracts with Customers. Revenue is recognized when our performance obligation has been satisfied according to our contractual obligation.

FEDERAL INCOME TAXES

FEDERAL INCOME TAXES: Deferred income tax assets and liabilities are determined using the liability (or balance sheet) method. Under this method, the net deferred tax assets or liabilities are determined based on the tax effects of the temporary differences between the book and tax basis on the various balance sheet assets and liabilities and gives current recognition to changes in tax rates and laws. Valuation allowances are established, where necessary, to reduce deferred tax assets to the amount expected to be realized. Income tax expense is the tax payable or refundable for the year plus or minus the change during the year in deferred tax assets and liabilities.

On December 22, 2017, the Tax Cuts and Jobs Act was enacted. The law established a flat corporate federal statutory income tax rate of 21%. In accordance with ASC 740, Income Taxes, the effect of income tax law changes on deferred taxes was recognized as a component of income tax expense related to continuing operations in the period in which the law was enacted. As such, federal income tax expense for the year ended December 31, 2017 reflects the effect of the tax rate change on net deferred tax assets and liabilities (see “Note 15 – Federal Income Taxes” and “Note 16 – Accumulated Other Comprehensive Income (Loss)”).

We analyze our filing positions in the jurisdictions where we are required to file income tax returns, as well as all open tax years in these jurisdictions. We also treat interest and penalties attributable to income taxes, to the extent they arise, as a component of our noninterest expenses.

DEFINED BENEFIT PENSION PLAN

DEFINED BENEFIT PENSION PLAN: We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. The service cost component of the defined benefit pension plan is included in “compensation and benefits” on the consolidated statements of income and is funded consistent with the requirements of federal laws and regulations. All other costs related to the defined benefit pension plan are included in “other” noninterest expenses on the consolidated statements of income. The current benefit obligation is included in "accrued interest payable and other liabilities" on the consolidated balance sheets. Inherent in the determination of defined benefit pension costs are assumptions concerning future events that will affect the amount and timing of required benefit payments under the plan. These assumptions include demographic assumptions such as mortality, a discount rate used to determine the current benefit obligation and a long-term expected rate of return on plan assets. Net periodic benefit cost includes the interest cost based on the assumed discount rate, an expected return on plan assets based on an actuarially derived market-related value of assets, and amortization of unrecognized net actuarial gains or losses. Actuarial gains and losses result from experience different from that assumed and from changes in assumptions (excluding asset gains and losses not yet reflected in market-related value). Amortization of actuarial gains and losses is included as a component of net periodic defined benefit pension cost.

For additional information, see “Note 12 – Benefit Plans.

We maintain a noncontributory defined benefit pension plan, which was curtailed effective March 1, 2007. As a result of the curtailment, future salary increases are no longer considered (the projected benefit obligation is equal to the accumulated benefit obligation), and plan benefits are based on years of service and the individual employee’s five highest consecutive years of compensation out of the last ten years of service through March 1, 2007.

MARKETING COSTS

MARKETING COSTS: Marketing costs are expensed as incurred (see “Note 14 – Other Noninterest Expenses”).

RECLASSIFICATIONS

RECLASSIFICATIONS: Certain amounts reported in the 2017 and 2016consolidated financial statements have been reclassified to conform with the 2018 presentation.

EARNINGS PER SHARE

Basic earnings per common share represents income available to common shareholders divided by the weighted average number of common shares outstanding during the period. Diluted earnings per common share includes additional common shares that would have been outstanding if dilutive potential common shares had been issued. Potential common shares that may be issued relate solely to outstanding shares in the Directors Plan, see "Note 12 – Benefit Plans."

NONACCRUAL LOAN STATUS

The accrual of interest on commercial, agricultural, and residential real estate loans is discontinued at the time the loan is 90 days or more past due unless the credit is well-secured and in the process of short-term collection. Upon transferring the loans to nonaccrual status, we perform an evaluation to determine the net realizable value of the underlying collateral. This evaluation is used to help determine if any charge-offs are necessary. Consumer loans are typically charged-off no later than 180 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed in nonaccrual status or charged-off at an earlier date if collection of principal or interest is considered doubtful.

When loans are placed in nonaccrual status or charged-off, all interest accrued in the current calendar year, but not collected, is reversed against interest income while interest accrued in prior calendar years, but not collected, is charged against the ALLL. Loans may be returned to accrual status after six months of continuous performance and achievement of current payment status.

IMPAIRED LOANS

Loans may be classified as impaired if they meet one or more of the following criteria:

1. There has been a charge-off of its principal balance (in whole or in part);

2. The loan has been classified as a TDR; or

3. The loan is in nonaccrual status.

Impairment is measured on a loan-by-loan basis for commercial and agricultural loans by comparing the loan’s outstanding balance to the present value of expected future cash flows discounted at the loan’s effective interest rate, or the fair value of the collateral, less cost to sell, if the loan is collateral dependent. Large groups of smaller-balance homogeneous loans are collectively evaluated for impairment. Large groups of smaller-balance, homogeneous residential real estate and consumer loans are collectively evaluated for impairment by comparing the loan’s unpaid principal balance to the present value of expected future cash flows discounted at the loan’s effective interest rate.

We do not recognize interest income on impaired loans in nonaccrual status. For impaired loans not classified as nonaccrual, interest income is recognized daily, as earned, according to the terms of the loan agreement and the principal amount outstanding.

TROUBLED DEBT RESTRUCTURINGS

A loan modification is considered to be a TDR when the modification includes terms outside of normal lending practices to a borrower who is experiencing financial difficulties.

Typical concessions granted include, but are not limited to:

1. Agreeing to interest rates below prevailing market rates for debt with similar risk characteristics.

2. Extending the amortization period beyond typical lending guidelines for loans with similar risk characteristics.

3. Agreeing to an interest only payment structure and delaying principal payments.

4. Forgiving principal.

5. Forgiving accrued interest.

To determine if a borrower is experiencing financial difficulties, factors we consider include:

1. The borrower is currently in default on any of their debt.

2. The borrower would likely default on any of their debt if the concession is not granted.

3. The borrower’s cash flow is insufficient to service all of their debt if the concession is not granted.

4. The borrower has declared, or is in the process of declaring, bankruptcy.

5. The borrower is unlikely to continue as a going concern (if the entity is a business).

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Fair Value Fair Value Measurement, Policy (Policies)

12 Months Ended

Dec. 31, 2018

Fair Value Measurement, Policy [Abstract]

Fair Value Measurement, Policy [Policy Text Block]

FAIR VALUE MEASUREMENTS: Fair value refers to the price that would be received to sell an asset or paid to transfer a liability (an exit price) in an orderly transaction between market participants in the market in which the reporting entity transacts such sales or transfers based on the assumptions market participants would use when pricing an asset or liability. Assumptions are developed based on prioritizing information within a fair value hierarchy that gives the highest priority to quoted prices in active markets and the lowest priority to unobservable data, such as the reporting entity’s own data. We may choose to measure eligible items at fair value at specified election dates.

For assets and liabilities recorded at fair value, it is our policy to maximize the use of observable inputs and minimize the use of unobservable inputs when developing fair value measurements for those financial instruments for which there is an active market. In cases where the market for a financial asset or liability is not active, we include appropriate risk adjustments that market participants would make for nonperformance and liquidity risks when developing fair value measurements. Fair value measurements for assets and liabilities for which limited or no observable market data exists are accordingly based primarily upon estimates, are often calculated based on the economic and competitive environment, the characteristics of the asset or liability and other factors. Therefore, the results cannot be determined with precision and may not be realized in an actual sale or immediate settlement of the asset or liability. Additionally, there may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results of current or future values.

We utilize fair value measurements to record fair value adjustments to certain assets and liabilities and to determine fair value disclosures. Investment securities AFS and derivative instruments are recorded at fair value on a recurring basis. Additionally, from time to time, we may be required to record other assets and liabilities at fair value on a nonrecurring basis, such as mortgage loans AFS, impaired loans, foreclosed assets, OMSR, goodwill, and certain other assets and liabilities. These nonrecurring fair value adjustments typically involve the application of lower of cost or market accounting or write downs of individual assets.

Fair Value Hierarchy

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

For further discussion of fair value considerations, refer to “Note 17 – Fair Value.”

Under fair value measurement and disclosure authoritative guidance, we group assets and liabilities measured at fair value into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value, based on the prioritization of inputs in the valuation techniques. These levels are:

Level 1:	Valuation is based upon quoted prices for identical instruments traded in active markets.
Level 2:	Valuation is based upon quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active and model based valuation techniques for which all significant assumptions are observable in the market.
Level 3:	Valuation is generated from model based techniques that use at least one significant assumption not observable in the market. These unobservable assumptions reflect estimates of assumptions that market participants would use in pricing the asset or liability.

The asset’s or liability’s fair value measurement level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement. Valuation techniques maximize the use of observable inputs and minimize the use of unobservable inputs. Transfers between measurement levels are recognized at the end of reporting periods.

Fair value measurement requires the use of an exit price notion which may differ from entrance pricing. Generally we believe our assets and liabilities classified as Level 1 or Level 2 approximate an exit price notion.

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Nature of Operations and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

Accounting Policies [Abstract]

Schedule of equity method and other investments

Equity securities without readily determinable fair values consist of the following holdings as of December 31:

	2018		2017
FHLB Stock	$	15,050	$	13,700
Corporate Settlement Solutions, LLC	7,565		7,421
FRB Stock	1,999		1,999
Other	334		334
Total	$	24,948	$	23,454

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AFS Securities (Tables)

12 Months Ended

Dec. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Amortized cost and fair value of available-for-sale securities

The amortized cost and fair value of AFS securities, with gross unrealized gains and losses, are as follows as of December 31:

	2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	172	$	—	$	2	$	170
States and political subdivisions	188,992		2,125		251		190,866
Auction rate money market preferred	3,200		—		646		2,554
Mortgage-backed securities	189,688		76		5,280		184,484
Collateralized mortgage obligations	119,193		71		2,504		116,760
Total	$	501,245	$	2,272	$	8,683	$	494,834

	2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Government sponsored enterprises	$	217	$	—	$	1	$	216
States and political subdivisions	204,131		4,486		143		208,474
Auction rate money market preferred	3,200		—		151		3,049
Mortgage-backed securities	210,757		390		2,350		208,797
Collateralized mortgage obligations	129,607		160		1,573		128,194
Total	$	547,912	$	5,036	$	4,218	$	548,730

Amortized cost and fair value of available-for-sale securities by contractual maturity

The amortized cost and fair value of AFS securities by contractual maturity at December 31, 2018 are as follows:

	Maturing								Securities with Variable Monthly Payments or Noncontractual Maturities
	Due in One Year or Less		After One Year But Within Five Years		After Five Years But Within Ten Years		After Ten Years				Total
Government sponsored enterprises	$	—	$	172	$	—	$	—	$	—	$	172
States and political subdivisions	23,151		81,901		55,923		28,017		—		188,992
Auction rate money market preferred	—		—		—		—		3,200		3,200
Mortgage-backed securities	—		—		—		—		189,688		189,688
Collateralized mortgage obligations	—		—		—		—		119,193		119,193
Total amortized cost	$	23,151	$	82,073	$	55,923	$	28,017	$	312,081	$	501,245
Fair value	$	23,189	$	82,662	$	56,842	$	28,343	$	303,798	$	494,834

Summary of the activity related to sales of available-for-sale securities

A summary of the sales activity of AFS securities during the years ended December 31 is displayed in the following table. There were no sales of AFS securities during 2018.

	2017		2016
Proceeds from sales of AFS securities	$	12,827	$	35,664
Gross realized gains (losses)	$	142	$	245
Applicable income tax expense (benefit)	$	48	$	83

Available-for-sale securities with gross unrealized losses

The following information pertains to AFS securities with gross unrealized losses at December 31 aggregated by investment category and length of time that individual securities have been in a continuous loss position.

	2018
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	—	$	—	$	2	$	170	$	2
States and political subdivisions	83		14,732		168		15,090		251
Auction rate money market preferred	—		—		646		2,554		646
Mortgage-backed securities	896		43,485		4,384		124,253		5,280
Collateralized mortgage obligations	199		21,886		2,305		87,929		2,504
Total	$	1,178	$	80,103	$	7,505	$	229,996	$	8,683
Number of securities in an unrealized loss position:			66				102		168

	2017
	Less Than Twelve Months				Twelve Months or More
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Total Unrealized Losses
Government sponsored enterprises	$	1	$	216	$	—	$	—	$	1
States and political subdivisions	142		16,139		1		188		143
Auction rate money market preferred	—		—		151		3,049		151
Mortgage-backed securities	454		72,007		1,896		76,065		2,350
Collateralized mortgage obligations	701		76,435		872		25,308		1,573
Total	$	1,298	$	164,797	$	2,920	$	104,610	$	4,218
Number of securities in an unrealized loss position:			81				24		105

Roll-forward of credit related impairment recognized in earnings

The following table provides a roll-forward of credit related impairment recorded in earnings for the years ended December 31:

	2018		2017		2016
Balance at beginning of the period	$	770	$	770	$	—
Additions to credit losses for which no previous OTTI was recognized	—		—		770
Reductions for credit losses realized on securities sold during the period	—		—		—
Balance at end of the period	$	770	$	770	$	770

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Loans and ALLL (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Summary of changes in the ALLL and the recorded investment in loans by segments

A summary of changes in the ALLL and the recorded investment in loans by segments follows:

	Allowance for Loan Losses
	Year Ended December 31, 2018
	Commercial			Agricultural		Residential Real Estate			Consumer			Unallocated		Total
January 1, 2018	$	1,706		$	611	$	2,563		$	900		$	1,920	$	7,700
Charge-offs	(626		)	—		(151		)	(324		)	—		(1,101		)
Recoveries	328			—		261			209			—		798
Provision for loan losses	1,155			164		(681		)	72			268		978
December 31, 2018	$	2,563		$	775	$	1,992		$	857		$	2,188	$	8,375

	Allowance for Loan Losses
	Year Ended December 31, 2017
	Commercial			Agricultural			Residential Real Estate			Consumer			Unallocated		Total
January 1, 2017	$	1,814		$	884		$	2,664		$	624		$	1,414	$	7,400
Charge-offs	(265		)	—			(200		)	(306		)	—		(771		)
Recoveries	453			—			206			159			—		818
Provision for loan losses	(296		)	(273		)	(107		)	423			506		253
December 31, 2017	$	1,706		$	611		$	2,563		$	900		$	1,920	$	7,700

Allowance for Loan Losses and Recorded Investment in Loans

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2018
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	443	$	132	$	1,363	$	—	$	—	$	1,938
Collectively evaluated for impairment	2,120		643		629		857		2,188		6,437
Total	$	2,563	$	775	$	1,992	$	857	$	2,188	$	8,375
Loans
Individually evaluated for impairment	$	9,899	$	14,298	$	6,893	$	9			$	31,099
Collectively evaluated for impairment	649,630		112,863		268,450		66,665				1,097,608
Total	$	659,529	$	127,161	$	275,343	$	66,674			$	1,128,707

	Allowance for Loan Losses and Recorded Investment in Loans
	As of December 31, 2017
	Commercial		Agricultural		Residential Real Estate		Consumer		Unallocated		Total
ALLL
Individually evaluated for impairment	$	650	$	—	$	1,480	$	—	$	—	$	2,130
Collectively evaluated for impairment	1,056		611		1,083		900		1,920		5,570
Total	$	1,706	$	611	$	2,563	$	900	$	1,920	$	7,700
Loans
Individually evaluated for impairment	$	8,099	$	10,598	$	7,939	$	17			$	26,653
Collectively evaluated for impairment	626,660		117,671		264,429		56,106				1,064,866
Total	$	634,759	$	128,269	$	272,368	$	56,123			$	1,091,519

Credit quality indicators for commercial and agricultural credit exposures

The following tables display the credit quality indicators for commercial and agricultural credit exposures based on internally assigned credit risk ratings as of December 31:

	2018
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	21	$	31	$	—	$	52	$	51	$	28	$	79	$	131
2 - High quality	4,564		13,473		—		18,037		2,729		613		3,342		21,379
3 - High satisfactory	127,573		43,199		11,793		182,565		18,325		7,039		25,364		207,929
4 - Low satisfactory	344,920		84,634		—		429,554		46,636		19,344		65,980		495,534
5 - Special mention	12,847		5,287		—		18,134		10,520		5,624		16,144		34,278
6 - Substandard	7,428		2,002		—		9,430		6,343		4,960		11,303		20,733
7 - Vulnerable	334		1,423		—		1,757		2,716		2,233		4,949		6,706
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	497,687	$	150,049	$	11,793	$	659,529	$	87,320	$	39,841	$	127,161	$	786,690

	2017
	Commercial								Agricultural
	Real Estate		Other		Advances to Mortgage Brokers		Total		Real Estate		Other		Total		Total
Rating
1 - Excellent	$	24	$	316	$	—	$	340	$	—	$	34	$	34	$	374
2 - High quality	8,402		12,262		—		20,664		2,909		1,024		3,933		24,597
3 - High satisfactory	131,826		46,668		12,081		190,575		21,072		8,867		29,939		220,514
4 - Low satisfactory	326,166		75,591		—		401,757		47,835		18,467		66,302		468,059
5 - Special mention	8,986		3,889		—		12,875		10,493		8,546		19,039		31,914
6 - Substandard	5,521		2,298		—		7,819		4,325		2,747		7,072		14,891
7 - Vulnerable	729		—		—		729		1,531		419		1,950		2,679
8 - Doubtful	—		—		—		—		—		—		—		—
9 - Loss	—		—		—		—		—		—		—		—
Total	$	481,654	$	141,024	$	12,081	$	634,759	$	88,165	$	40,104	$	128,269	$	763,028

Summary of past due and current loans

Our primary credit quality indicator for residential real estate and consumer loans is the individual loan’s past due aging. The following tables summarize the past due and current loans as of December 31:

	2018
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	60	$	—	$	—	$	334	$	394	$	497,293	$	497,687
Commercial other	277		628		—		1,423		2,328		147,721		150,049
Advances to mortgage brokers	—		—		—		—		—		11,793		11,793
Total commercial	337		628		—		1,757		2,722		656,807		659,529
Agricultural
Agricultural real estate	428		—		—		2,716		3,144		84,176		87,320
Agricultural other	—		—		—		2,233		2,233		37,608		39,841
Total agricultural	428		—		—		4,949		5,377		121,784		127,161
Residential real estate
Senior liens	2,254		203		113		554		3,124		233,438		236,562
Junior liens	2		6		—		—		8		6,001		6,009
Home equity lines of credit	76		—		—		—		76		32,696		32,772
Total residential real estate	2,332		209		113		554		3,208		272,135		275,343
Consumer
Secured	95		—		—		—		95		62,721		62,816
Unsecured	10		—		—		—		10		3,848		3,858
Total consumer	105		—		—		—		105		66,569		66,674
Total	$	3,202	$	837	$	113	$	7,260	$	11,412	$	1,117,295	$	1,128,707

	2017
	Accruing Interest and Past Due:								Total Past Due and Nonaccrual
	30-59 Days		60-89 Days		90 Days or More		Nonaccrual				Current		Total
Commercial
Commercial real estate	$	295	$	325	$	54	$	729	$	1,403	$	480,251	$	481,654
Commercial other	1,069		28		18		—		1,115		139,909		141,024
Advances to mortgage brokers	—		—		—		—		—		12,081		12,081
Total commercial	1,364		353		72		729		2,518		632,241		634,759
Agricultural
Agricultural real estate	84		190		—		1,531		1,805		86,360		88,165
Agricultural other	39		—		104		419		562		39,542		40,104
Total agricultural	123		190		104		1,950		2,367		125,902		128,269
Residential real estate
Senior liens	3,718		234		132		325		4,409		225,007		229,416
Junior liens	69		10		—		23		102		6,812		6,914
Home equity lines of credit	293		—		77		—		370		35,668		36,038
Total residential real estate	4,080		244		209		348		4,881		267,487		272,368
Consumer
Secured	37		10		10		—		57		52,005		52,062
Unsecured	13		—		—		—		13		4,048		4,061
Total consumer	50		10		10		—		70		56,053		56,123
Total	$	5,617	$	797	$	395	$	3,027	$	9,836	$	1,081,683	$	1,091,519

Information pertaining to impaired loans

The following summarizes information pertaining to impaired loans as of, and for the years ended, December 31:

	2018
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	3,969	$	4,211	$	437	$	4,589	$	129
Commercial other	12		12		6		1,040		55
Agricultural real estate	392		392		112		606		50
Agricultural other	44		44		20		168		46
Residential real estate senior liens	6,834		7,289		1,361		7,545		126
Residential real estate junior liens	12		12		2		25		—
Home equity lines of credit	—		—		—		—		—
Total impaired loans with a valuation allowance	11,263		11,960		1,938		13,973		406
Impaired loans without a valuation allowance
Commercial real estate	2,794		2,947				2,728		74
Commercial other	3,124		3,231				1,533		43
Agricultural real estate	7,618		7,618				7,559		585
Agricultural other	6,244		6,287				4,636		279
Home equity lines of credit	47		347				64		5
Consumer secured	9		9				12		—
Total impaired loans without a valuation allowance	19,836		20,439				16,532		986
Impaired loans
Commercial	9,899		10,401		443		9,890		301
Agricultural	14,298		14,341		132		12,969		960
Residential real estate	6,893		7,648		1,363		7,634		131
Consumer	9		9		—		12		—
Total impaired loans	$	31,099	$	32,399	$	1,938	$	30,505	$	1,392

	2017
	Recorded Balance		Unpaid Principal Balance		Valuation Allowance		Average Recorded Balance		Interest Income Recognized
Impaired loans with a valuation allowance
Commercial real estate	$	4,089	$	4,378	$	626	$	4,608	$	277
Commercial other	995		995		24		1,427		93
Agricultural real estate	—		—		—		—		—
Agricultural other	—		—		—		17		—
Residential real estate senior liens	7,816		8,459		1,473		8,296		323
Residential real estate junior liens	44		44		7		71		2
Home equity lines of credit	—		—		—		23		—
Total impaired loans with a valuation allowance	12,944		13,876		2,130		14,442		695
Impaired loans without a valuation allowance
Commercial real estate	1,791		1,865				1,585		111
Commercial other	1,224		1,224				246		23
Agricultural real estate	7,913		7,913				6,421		307
Agricultural other	2,685		2,685				2,494		126
Home equity lines of credit	79		379				106		19
Consumer secured	17		17				21		—
Total impaired loans without a valuation allowance	13,709		14,083				10,873		586
Impaired loans
Commercial	8,099		8,462		650		7,866		504
Agricultural	10,598		10,598		—		8,932		433
Residential real estate	7,939		8,882		1,480		8,496		344
Consumer	17		17		—		21		—
Total impaired loans	$	26,653	$	27,959	$	2,130	$	25,315	$	1,281

Information pertaining to TDR's

The following is a summary of TDR loan balances as of December 31:

	2018		2017
TDRs	$	26,951	$	26,197

The following is a summary of information pertaining to TDRs granted in the years ended December 31:

	2018					2017
	Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Post-Modification Recorded Investment
Commercial other	4	$	1,360	$	1,360	6	$	1,702	$	1,702
Agricultural other	31	6,318		6,295		15	6,092		6,092
Residential real estate
Senior liens	10	701		701		6	464		464
Junior liens	—	—		—		1	8		8
Total residential real estate	10	701		701		7	472		472
Total	45	$	8,379	$	8,356	28	$	8,266	$	8,266

The following tables summarize concessions we granted to borrowers in financial difficulty in the years ended December 31:

	2018						2017
	Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period			Below Market Interest Rate			Below Market Interest Rate and Extension of Amortization Period
	Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment		Number of Loans	Pre-Modification Recorded Investment
Commercial other	1	$	174	3	$	1,186	—	$	—	6	$	1,702
Agricultural other	18	2,625		13	3,693		11	1,972		4	4,120
Residential real estate
Senior liens	3	203		7	498		—	—		6	464
Junior liens	—	—		—	—		1	8		—	—
Total residential real estate	3	203		7	498		1	8		6	464
Total	22	$	3,002	23	$	5,377	12	$	1,980	16	$	6,286

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Premises and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Summary of premises and equipment

A summary of premises and equipment at December 31 follows:

	2018		2017
Land	$	6,336	$	6,336
Buildings and improvements	30,100		29,661
Furniture and equipment	34,825		33,466
Total	71,261		69,463
Less: accumulated depreciation	43,446		41,013
Premises and equipment, net	$	27,815	$	28,450

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Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of identifiable intangible assets

Identifiable intangible assets were as follows as of December 31:

	2018
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,410	$	169

	2017
	Gross Intangible Assets		Accumulated Amortization		Net Intangible Assets
Core deposit premium resulting from acquisitions	$	5,579	$	5,314	$	265

Summary of estimated amortization expense associated with identifiable intangibles

Estimated amortization expense associated with identifiable intangibles for each of the next five years succeeding December 31, 2018, and thereafter is as follows:

	Estimated Amortization Expense
2019	$	71
2020	48
2021	29
2022	15
2023	2
Thereafter	4
Total	$	169

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Borrowed Funds (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Summary of borrowed funds

Borrowed funds consist of the following obligations at December 31:

	2018				2017
	Amount		Rate		Amount		Rate
FHLB advances	$	300,000	2.20	%	$	290,000	1.94	%
Securities sold under agreements to repurchase without stated maturity dates	40,299		0.11	%	54,878		0.12	%
Total	$	340,299	1.95	%	$	344,878	1.65	%

Federal home loan bank, advances

The following table lists the maturities and weighted average interest rates of FHLB advances as of December 31:

	2018				2017
	Amount		Rate		Amount		Rate
Fixed rate due 2018	$	—	—	%	$	70,000	1.96	%
Fixed rate due 2019	100,000		1.94	%	85,000		1.87	%
Fixed rate due 2020	55,000		2.18	%	35,000		1.80	%
Fixed rate due 2021	50,000		1.91	%	50,000		1.91	%
Variable rate due 2021 (1)	10,000		2.93	%	10,000		1.72	%
Fixed rate due 2022	20,000		1.97	%	20,000		1.97	%
Fixed rate due 2023	35,000		3.17	%	10,000		3.90	%
Fixed rate due 2024	20,000		2.96	%	—		—	%
Fixed rate due 2026	10,000		1.17	%	10,000		1.17	%
Total	$	300,000	2.20	%	$	290,000	1.94	%

⁽¹⁾ Hedged advance (see "Derivative Instruments" section below)

Summary of short term borrowings

The following tables provide a summary of securities sold under repurchase agreements without stated maturity dates, federal funds purchased, and FRB Discount advances at December 31:

	2018						2017
	Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period		Maximum Month End Balance		Average Balance		Weighted Average Interest Rate During the Period
Securities sold under agreements to repurchase without stated maturity dates	$	63,133	$	38,036	0.10	%	$	58,464	$	55,206	0.13	%
Federal funds purchased	16,200		3,741		1.78	%	5,965		2,726		1.15	%
FRB Discount Window	—		—		—	%	—		43		1.54	%

Summary of pledged financial instruments

We had pledged AFS securities and 1-4 family residential real estate loans in the following amounts at December 31:

	2018		2017
Pledged to secure borrowed funds	$	431,430	$	410,988
Pledged to secure repurchase agreements	40,316		54,898
Pledged for public deposits and for other purposes necessary or required by law	58,107		27,976
Total	$	529,853	$	493,862

AFS securities pledged to repurchase agreements without stated maturity dates consisted of the following at December 31:

	2018		2017
States and political subdivisions	$	23,268	$	7,332
Mortgage-backed securities	10,736		13,199
Collateralized mortgage obligations	6,312		34,367
Total	$	40,316	$	54,898

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

The following tables provide information on derivatives related to variable rate borrowings as of December 31:

	2018
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	2.3	$	10,000	Other Assets	$	323

	2017
	Pay Rate		Receive Rate	Remaining Life (Years)	Notional Amount		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments
Cash Flow Hedges:
Interest rate swaps	1.56	%	3-Month LIBOR	3.3	$	10,000	Other Assets	$	291

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Deposits (Tables)

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Scheduled maturities of time deposits

Scheduled maturities of time deposits for the next five years, and thereafter, are as follows:

	Scheduled Maturities of Time Deposits
2019	$	232,349
2020	56,051
2021	65,036
2022	41,502
2023	31,714
Thereafter	6,968
Total	$	433,620

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Off-Balance-Sheet Activities (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Notional amount of financial instrument

The following table summarizes our credit related financial instruments with off-balance-sheet risk as of December 31:

	2018		2017
Unfunded commitments under lines of credit	$	199,652	$	184,317
Commercial and standby letters of credit	1,723		1,622
Commitments to grant loans	13,225		24,782
Total	$	214,600	$	210,721

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Minimum Regulatory Capital Requirements (Tables)

12 Months Ended

Dec. 31, 2018

Banking and Thrift [Abstract]

Summary of compliance with regulatory capital requirements

Our actual capital amounts and ratios are also presented in the table.

	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2018
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	143,429	11.75	%	$	48,832	6.375	%	$	73,248	6.50	%
Consolidated	154,705		12.58	%	49,212		6.375	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	143,429		11.75	%	48,832		7.875	%	73,248		8.00	%
Consolidated	154,705		12.58	%	49,212		7.875	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	151,804		12.43	%	97,664		9.875	%	122,080		10.00	%
Consolidated	163,080		13.26	%	98,423		9.875	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	143,429		8.07	%	71,085		4.00	%	88,856		5.00	%
Consolidated	154,705		8.72	%	70,996		4.00	%	N/A		N/A

	Actual				Minimum Capital Requirement				Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions
	Amount		Ratio		Amount		Ratio		Amount		Ratio
December 31, 2017
Common equity Tier 1 capital to risk weighted assets
Isabella Bank	$	139,897	11.56	%	$	48,404	5.750	%	$	72,605	6.50	%
Consolidated	149,013		12.23	%	48,744		5.750	%	N/A		N/A
Tier 1 capital to risk weighted assets
Isabella Bank	139,897		11.56	%	48,404		7.250	%	72,605		8.00	%
Consolidated	149,013		12.23	%	48,744		7.250	%	N/A		N/A
Total capital to risk weighted assets
Isabella Bank	147,597		12.20	%	96,807		9.250	%	121,009		10.00	%
Consolidated	156,713		12.86	%	97,488		9.250	%	N/A		N/A
Tier 1 capital to average assets
Isabella Bank	139,897		8.07	%	69,373		4.000	%	86,717		5.00	%
Consolidated	149,013		8.54	%	69,827		4.000	%	N/A		N/A

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Computation of Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Computation of earnings per common share

Earnings per common share have been computed based on the following:

	2018		2017		2016
Average number of common shares outstanding for basic calculation	7,872,077		7,841,451		7,813,739
Average potential effect of common shares in the Directors Plan (1)	200,771		192,286		185,611
Average number of common shares outstanding used to calculate diluted earnings per common share	8,072,848		8,033,737		7,999,350
Net income	$	14,021	$	13,237	$	13,799
Earnings per common share
Basic	$	1.78	$	1.69	$	1.77
Diluted	$	1.74	$	1.65	$	1.73

⁽¹⁾ Exclusive of shares held in the Rabbi Trust

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Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2018

Retirement Benefits [Abstract]

Changes in the projected benefit obligation, plan assets and Accrued pension benefit costs

Changes in the projected benefit obligation and plan assets during each year, the funded status of the plan, and the net amount recognized in our consolidated balance sheets using an actuarial measurement date of December 31, are summarized as follows during the years ended December 31:

	2018			2017
Change in benefit obligation
Benefit obligation, January 1	$	11,381		$	11,448
Interest cost	388			444
Actuarial (gain) loss	(1,194		)	578
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Benefit obligation, December 31	9,412			11,381
Change in plan assets
Fair value of plan assets, January 1	9,469			9,325
Investment (loss) return	(541		)	1,033
Contributions	—			200
Benefits paid, including plan expenses	(1,163		)	(1,089		)
Fair value of plan assets, December 31	7,765			9,469
Deficiency in funded status at December 31, included on the consolidated balance sheets in accrued interest payable and other liabilities	$	(1,647	)	$	(1,912	)

	2018			2017
Change in accrued pension benefit costs
Accrued benefit cost at January 1	$	(1,912	)	$	(2,123	)
Contributions	—			200
Net periodic benefit cost	(345		)	(412		)
Net change in unrecognized actuarial loss and prior service cost	610			423
Accrued pension benefit cost at December 31	$	(1,647	)	$	(1,912	)

Components of net periodic benefit cost

The components of projected net periodic benefit cost are as follows for the year ending:

	December 31, 2019
Interest cost on projected benefit obligation	$	378
Expected return on plan assets	(452		)
Amortization of unrecognized actuarial net loss	214
Net periodic benefit cost	$	140

The components of net periodic benefit cost are as follows for the years ended December 31:

	2018			2017			2016
Interest cost on benefit obligation	$	388		$	444		$	485
Expected return on plan assets	(554		)	(546		)	(560		)
Amortization of unrecognized actuarial net loss	242			279			313
Settlement loss	269			235			—
Net periodic benefit cost	$	345		$	412		$	238

Actuarial assumptions used

The actuarial assumptions used in determining the benefit obligation are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	4.11	%	3.48	%	3.96	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

The actuarial weighted average assumptions used in determining the net periodic pension costs are as follows for the years ended December 31:

	2018		2017		2016
Discount rate	3.48	%	3.96	%	4.13	%
Expected long-term rate of return on plan assets	6.00	%	6.00	%	6.00	%

Fair values of the Corporations pension plan assets by asset category

The fair values of our pension plan assets by asset category were as follows as of December 31:

	2018				2017
	Total		(Level 2)		Total		(Level 2)
Short-term investments	$	98	$	98	$	300	$	300
Common collective trusts
Fixed income	2,924		2,924		3,815		3,815
Equity investments	4,743		4,743		5,354		5,354
Total	$	7,765	$	7,765	$	9,469	$	9,469

Summary of Estimated future benefit payments

Estimated future benefit payments are as follows for the next ten years:

	Estimated Benefit Payments
2019	$	450
2020	486
2021	479
2022	481
2023	481
2024 - 2028	2,540

Components of shares eligible to be issued under the Directors Plan

The components of shares eligible to be issued under the Directors Plan were as follows as of December 31:

	2018			2017
	Eligible Shares	Market Value		Eligible Shares	Market Value
Unissued	203,498	$	4,591	195,140	$	5,513
Shares held in Rabbi Trust	16,673	376		31,769	897
Total	220,171	$	4,967	226,909	$	6,410

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Other Noninterest Expenses (Tables)

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Summary of expenses included in other noninterest expenses

A summary of expenses included in other noninterest expenses is as follows for the years ended December 31:

	2018		2017		2016
Audit, consulting, and legal fees	$	2,263	$	2,043	$	1,952
ATM and debit card fees	1,036		1,181		887
Loan underwriting fees	1,016		556		535
Director fees	858		856		851
FDIC insurance premiums	726		642		719
Donations and community relations	710		657		582
Marketing costs	596		568		586
OTTI on AFS securities	—		—		770
All other	3,558		3,541		3,343
Total other	$	10,763	$	10,044	$	10,225

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Federal Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Components of the consolidated provision for federal income taxes

Components of the consolidated provision for federal income taxes are as follows for the years ended December 31:

	2018		2017		2016
Currently payable	$	1,088	$	180	$	2,630
Deferred expense (benefit)	275		2,836		(282		)
Income tax expense	$	1,363	$	3,016	$	2,348

Summary of federal income tax expense

The reconciliation of the provision for federal income taxes and the amount computed at the federal statutory tax rate of income before federal income tax expense is as follows for the year ended December 31:

	2018			2017			2016
Income taxes at statutory rate (21% in 2018 and 34% in 2017 and 2016)	$	3,231		$	5,526		$	5,490
Effect of nontaxable income
Interest income on tax exempt municipal securities	(1,106		)	(1,889		)	(1,938		)
Earnings on corporate owned life insurance policies	(148		)	(247		)	(419		)
Deferred tax adjustment resulting from the statutory rate reduction pursuant to the Tax Act	—			319			—
Other	231			34			(154		)
Total effect of nontaxable income	(1,023		)	(1,783		)	(2,511		)
Effect of nondeductible expenses	113			149			143
Effect of tax credits	(958		)	(876		)	(774		)
Federal income tax expense	$	1,363		$	3,016		$	2,348

Summary of deferred tax assets and liabilities

Significant components of our deferred tax assets and liabilities, measured at the 21% statutory rate, included in other assets in the accompanying consolidated balance sheets, are as follows as of December 31:

	2018		2017
Deferred tax assets
Allowance for loan losses	$	1,304	$	1,076
Deferred directors’ fees	1,667		1,758
Employee benefit plans	81		70
Core deposit premium and acquisition expenses	752		733
Net unrecognized actuarial losses on pension plan	729		857
Net unrealized losses on available-for-sale securities	1,211		—
Life insurance death benefit payable	497		497
Alternative minimum tax	710		1,463
Other	716		607
Total deferred tax assets	7,667		7,061
Deferred tax liabilities
Prepaid pension cost	383		455
Premises and equipment	1,548		1,728
Accretion on securities	41		40
Core deposit premium and acquisition expenses	946		909
Net unrealized gains on available-for-sale securities	—		204
Net unrealized gains on derivative instruments	68		61
Other	1,696		1,684
Total deferred tax liabilities	4,682		5,081
Net deferred tax assets	$	2,985	$	1,980

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Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2018

Equity [Abstract]

Summary of the components of accumulated other comprehensive income

A summary of the components of unrealized holding gains on AFS securities included in OCI follows for the years ended December 31:

	2018									2017								2016
	Auction Rate Money Market Preferred Stocks			All Other AFS Securities			Total			Auction Rate Money Market Preferred Stocks		All Other AFS Securities			Total			Auction Rate Money Market Preferred and Preferred Stocks		All Other AFS securities			Total
Unrealized gains (losses) arising during the period	$	(495	)	$	(6,734	)	$	(7,229	)	$	407	$	(118	)	$	289		$	54	$	(5,919	)	$	(5,865	)
Reclassification adjustment for net (gains) losses included in net income	—			—			—			—		(142		)	(142		)	—		(245		)	(245		)
Reclassification adjustment for impairment loss included in net income	—			—			—			—		—			—			—		770			770
Net unrealized gains (losses)	(495		)	(6,734		)	(7,229		)	407		(260		)	147			54		(5,394		)	(5,340		)
Tax effect (1)	—			1,415			1,415			—		89			89			—		1,834			1,834
Unrealized gains (losses), net of tax	$	(495	)	$	(5,319	)	$	(5,814	)	$	407	$	(171	)	$	236		$	54	$	(3,560	)	$	(3,506	)

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

The following table provides a roll-forward of the changes in AOCI by component for the years ended December 31, 2016, 2017 and 2018 (net of tax):

	Unrealized Holding Gains (Losses) on AFS Securities			Unrealized Gains (Losses) on Derivative Instruments			Change in Unrecognized Pension Cost on Defined Benefit Pension Plan			Total
Balance, January 1, 2016	$	3,536		$	—		$	(3,315	)	$	221
OCI before reclassifications	(5,865		)	248			282			(5,335		)
Amounts reclassified from AOCI	525			—			238			763
Subtotal	(5,340		)	248			520			(4,572		)
Tax effect	1,834			(84		)	(177		)	1,573
OCI, net of tax	(3,506		)	164			343			(2,999		)
Balance, December 31, 2016	30			164			(2,972		)	(2,778		)
OCI before reclassifications	289			43			11			343
Amounts reclassified from AOCI	(142		)	—			412			270
Subtotal	147			43			423			613
Tax effect	89			(15		)	(144		)	(70		)
OCI, net of tax	236			28			279			543
One-time non-cash tax rate adjustment due to the Tax Act	125			38			(530		)	(367		)
Balance, December 31, 2017	391			230			(3,223		)	(2,602		)
OCI before reclassifications	(7,229		)	33			265			(6,931		)
Amounts reclassified from AOCI	—			—			345			345
Subtotal	(7,229		)	33			610			(6,586		)
Tax effect	1,415			(7		)	(128		)	1,280
OCI, net of tax	(5,814		)	26			482			(5,306		)
Adoption of ASU 2016-01	223			—			—			223
Balance, December 31, 2018	$	(5,200	)	$	256		$	(2,741	)	$	(7,685	)

Details about accumulated other comprehensive income components

The following table details reclassification adjustments and the related affected line items in our consolidated statements of income for the years ended December 31:

Details about AOCI components	Amount Reclassified from AOCI							Affected Line Item in the Consolidated Statements of Income
	2018		2017		2016
Unrealized holding gains (losses) on AFS securities
	$	—	$	142	$	245		Net gains on sale of AFS securities
	—		—		(770		)	Other noninterest expenses
	—		142		(525		)	Income before federal income tax expense
	—		48		(179		)	Federal income tax expense (benefit) (1)
	$	—	$	94	$	(346	)	Net income
Change in unrecognized pension cost on defined benefit pension plan
	$	345	$	412	$	238		Other noninterest expenses
	72		140		81			Federal income tax expense (1)
	$	273	$	272	$	157		Net income

⁽¹⁾ Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

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Fair Value (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Quantitative information about assets measured utilizing Level 3 fair value measurement

The following tables list the quantitative fair value information about impaired loans as of:

	December 31, 2018
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 40%
		Cash crop inventory	30% - 40%
Discounted value	$20,045	Livestock	30%
		Other inventory	45% - 50%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

	December 31, 2017
Valuation Technique	Fair Value	Unobservable Input	Actual Range
		Discount applied to collateral:
		Real Estate	20% - 30%
		Equipment	20% - 35%
		Cash crop inventory	30% - 40%
Discounted value	$15,956	Livestock	30%
		Other inventory	50% - 75%
		Accounts receivable	50%
		Liquor license	75%
		Furniture, fixtures & equipment	35% - 45%

Carrying amount and estimated fair value of financial instruments not recorded at fair value

The carrying amount and estimated fair value of financial instruments not recorded at fair value in their entirety on a recurring basis were as follows as of December 31:

	2018
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	73,471	$	73,471	$	73,471	$	—	$	—
Mortgage loans AFS	358		365		—		365		—
Gross loans	1,128,707		1,099,645		—		—		1,099,645
Less allowance for loan and lease losses	8,375		8,375		—		—		8,375
Net loans	1,120,332		1,091,270		—		—		1,091,270
Accrued interest receivable	6,928		6,928		6,928		—		—
Equity securities without readily determinable fair values (1)	24,948		N/A		—		—		—
OMSR	2,434		2,602		—		2,602		—
LIABILITIES
Deposits without stated maturities	859,073		859,073		859,073		—		—
Deposits with stated maturities	433,620		425,993		—		425,993		—
Borrowed funds	340,299		333,829		—		333,829		—
Accrued interest payable	826		826		826		—		—

	2017
	Carrying Value		Estimated Fair Value		Level 1		Level 2		Level 3
ASSETS
Cash and cash equivalents	$	30,848	$	30,848	$	30,848	$	—	$	—
Mortgage loans AFS	1,560		1,587		—		1,587		—
Gross loans	1,091,519		1,056,906		—		—		1,056,906
Less allowance for loan and lease losses	7,700		7,700		—		—		7,700
Net loans	1,083,819		1,049,206		—		—		1,049,206
Accrued interest receivable	7,063		7,063		7,063		—		—
Equity securities without readily determinable fair values (1)	23,454		N/A		—		—		—
OMSR	2,409		2,409		—		2,409		—
LIABILITIES
Deposits without stated maturities	811,992		811,992		811,992		—		—
Deposits with stated maturities	453,266		443,892		—		443,892		—
Borrowed funds	344,878		342,089		—		342,089		—
Accrued interest payable	680		680		680		—		—

⁽¹⁾ Due to the characteristics of equity securities without readily determinable fair values, they are not disclosed under a specific fair value hierarchy. If we were to record an impairment adjustment related to these securities, such amount would be classified as a nonrecurring Level 3 fair value adjustment.

Assets and liabilities measured at fair value

The table below presents the recorded amount of assets and liabilities measured at fair value on December 31:

	2018											2017
	Total		Level 1			Level 2			Level 3			Total		Level 1			Level 2			Level 3
Recurring items
AFS securities
Government-sponsored enterprises	$	170	$	—		$	170		$	—		$	216	$	—		$	216		$	—
States and political subdivisions	190,866		—			190,866			—			208,474		—			208,474			—
Auction rate money market preferred	2,554		—			2,554			—			3,049		—			3,049			—
Mortgage-backed securities	184,484		—			184,484			—			208,797		—			208,797			—
Collateralized mortgage obligations	116,760		—			116,760			—			128,194		—			128,194			—
Total AFS securities	494,834		—			494,834			—			548,730		—			548,730			—
Equity securities	—		—			—			—			3,577		3,577			—			—
Derivative instruments	323		—			323			—			291		—			291			—
Nonrecurring items
Impaired loans (net of the ALLL)	20,045		—			—			20,045			15,956		—			—			15,956
Total	$	515,202	$	—		$	495,157		$	20,045		$	568,554	$	3,577		$	549,021		$	15,956
Percent of assets and liabilities measured at fair value			—		%	96.11		%	3.89		%			0.63		%	96.56		%	2.81		%

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Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2018

Related Party Transactions [Abstract]

Schedule of related party transactions

Annual activity consisted of the following for the years ended December 31:

	2018			2017
Balance, January 1	$	4,335		$	3,946
New loans	1,184			3,895
Repayments	(2,176		)	(3,506		)
Balance, December 31	$	3,343		$	4,335

The following table displays total asset balances of the Foundation as of December 31:

	2018		2017		2016
Total assets	$	1,731	$	2,162	$	2,213

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Parent Company Only Financial Information (Tables)

12 Months Ended

Dec. 31, 2018

Condensed Financial Information Disclosure [Abstract]

Interim Condensed Balance Sheets

Condensed Balance Sheets

	December 31
	2018		2017
ASSETS
Cash on deposit at the Bank	$	2,499	$	185
Investments in subsidiaries	143,942		145,962
Premises and equipment	1,912		1,950
Other assets	51,674		52,253
TOTAL ASSETS	$	200,027	$	200,350
LIABILITIES AND SHAREHOLDERS’ EQUITY
Other liabilities	$	4,508	$	5,445
Shareholders' equity	195,519		194,905
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$	200,027	$	200,350

Interim Condensed Statements of Income

Condensed Statements of Income

	Year Ended December 31
	2018		2017		2016
Income
Dividends from subsidiaries	$	13,100	$	9,600	$	7,400
Interest income	1		2		14
Management fee and other	3,030		6,463		6,574
Total income	16,131		16,065		13,988
Expenses
Compensation and benefits	4,132		5,196		4,898
Occupancy and equipment	513		1,779		1,696
Audit and related fees	368		527		536
Other	1,615		2,566		2,120
Total expenses	6,628		10,068		9,250
Income before income tax benefit and equity in undistributed earnings of subsidiaries	9,503		5,997		4,738
Federal income tax benefit	749		91		1,058
Income before equity in undistributed earnings of subsidiaries	10,252		6,088		5,796
Undistributed earnings of subsidiaries	3,769		7,149		8,003
Net income	$	14,021	$	13,237	$	13,799

Interim Condensed Statements of Cash Flows

Condensed Statements of Cash Flows

	Year Ended December 31
	2018			2017			2016
Operating activities
Net income	$	14,021		$	13,237		$	13,799
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries	(3,769		)	(7,149		)	(8,003		)
Undistributed earnings of equity securities without readily determinable fair values	(144		)	40			791
Share-based payment awards under equity compensation plan	612			640			573
Depreciation	134			154			156
Deferred income tax expense (benefit)	(31		)	792			147
Changes in operating assets and liabilities which provided (used) cash
Other assets	1,237			42			(44		)
Accrued interest and other liabilities	(937		)	(1,590		)	(2,669		)
Net cash provided by (used in) operating activities	11,123			6,166			4,750
Investing activities
Maturities, calls, principal payments, and sales of AFS securities	—			249			—
Sales (purchases) of premises and equipment	(96		)	(113		)	(133		)
Net cash provided by (used in) investing activities	(96		)	136			(133		)
Financing activities
Net increase (decrease) in borrowed funds	—			—			—
Cash dividends paid on common stock	(8,169		)	(7,990		)	(7,645		)
Proceeds from the issuance of common stock	6,864			6,177			5,023
Common stock repurchased	(7,007		)	(5,181		)	(4,440		)
Common stock purchased for deferred compensation obligations	(401		)	(420		)	(383		)
Net cash provided by (used in) financing activities	(8,713		)	(7,414		)	(7,445		)
Increase (decrease) in cash and cash equivalents	2,314			(1,112		)	(2,828		)
Cash and cash equivalents at beginning of period	185			1,297			4,125
Cash and cash equivalents at end of period	$	2,499		$	185		$	1,297

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Nature of Operations and Summary of Significant Accounting Policies (Equity Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
FHLB Stock	$ 15,050	$ 13,700
FRB Stock	1,999	1,999
Other	334	334
Total	24,948	23,454
Investment in Corporate Settlement Solutions [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 7,565	$ 7,421

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Nature of Operations and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Location shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016 USD ($)
Accounting Policies [Abstract]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 355	$ 291
Number of location of banking operations | Location	30
Period for federal fund sold	1 day
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unpaid principal balance of mortgages serviced for others	$ 259,481	266,789
Capitalized mortgage loans on real estate carrying amount	2,435	2,409
Corporation recorded servicing fee revenue	651	671	$ 696
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Present value of the post retirement benefits payable	2,751	2,751
Periodic policy maintenance costs	$ 0	$ 577	$ (8)
Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Eligible shares, total | shares	220,171	226,909
Common stock, shares held in Rabbi Trust | shares	16,673	31,769
Minimum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of the related assets	3 years
Maximum [Member]
Property, Plant and Equipment [Line Items]
Useful lives of the related assets	40 years
Commercial, Agricultural, and Residential Portfolio Segments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due (or more), accrual of interest discontinued	90 days
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum days of consumer loan charged off	180 days

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AFS Securities (Amortized cost and fair value of AFS securities, with gross unrealized gains and losses) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 501,245	$ 547,912
Gross Unrealized Gains	2,272	5,036
Gross Unrealized Losses	8,683	4,218
AFS securities	494,834	548,730
Debt Securities, Available-for-sale	494,834	548,730
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	172	217
Amortized Cost	172
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2	1
Debt Securities, Available-for-sale	170	216
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	188,992	204,131
Amortized Cost	188,992
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2,125	4,486
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	251	143
Debt Securities, Available-for-sale	190,866	208,474
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,200	3,200
Amortized Cost	3,200
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	646	151
Debt Securities, Available-for-sale	2,554	3,049
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	189,688	210,757
Amortized Cost	189,688
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	76	390
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	5,280	2,350
Debt Securities, Available-for-sale	184,484	208,797
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	119,193	129,607
Amortized Cost	119,193
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	71	160
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	2,504	1,573
Debt Securities, Available-for-sale	$ 116,760	$ 128,194

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AFS Securities (Amortized cost and fair value of AFS securities by contractual maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	$ 23,151
Maturing, After One Year But Within Five Years	82,073
Maturing, After Five Years But Within Ten Years	55,923
Maturing, After Ten Years	28,017
Securities With Variable Monthly Payments or Noncontractual Maturities	312,081
Amortized Cost	501,245	$ 547,912
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less, Fair value	23,189
Maturing, After One Year But Within Five Years, Fair value	82,662
Maturing, After Five Years But Within Ten Years, Fair value	56,842
Maturing, After Ten Years, Fair value	28,343
Securities With Variable Monthly Payments or Noncontractual Maturities, Fair value	303,798
Total, Fair value	494,834	$ 548,730
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	172
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	0
Amortized Cost	172
States and political subdivisions [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	23,151
Maturing, After One Year But Within Five Years	81,901
Maturing, After Five Years But Within Ten Years	55,923
Maturing, After Ten Years	28,017
Securities With Variable Monthly Payments or Noncontractual Maturities	0
Amortized Cost	188,992
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	3,200
Amortized Cost	3,200
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	189,688
Amortized Cost	189,688
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract]
Maturing, Due in One Year or Less	0
Maturing, After One Year But Within Five Years	0
Maturing, After Five Years But Within Ten Years	0
Maturing, After Ten Years	0
Securities With Variable Monthly Payments or Noncontractual Maturities	119,193
Amortized Cost	$ 119,193

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AFS Securities (Activity related to sales of AFS securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales of AFS of securities	$ 0	$ 12,827	$ 35,664
Gross realized gains (losses)		142	245
Applicable income tax expense		$ 48	$ 83

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AFS Securities (AFS securities with gross unrealized losses) (Details) $ in Thousands	Dec. 31, 2018 USD ($) Securities	Dec. 31, 2017 USD ($) Securities
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 1,178	$ 1,298
Fair Value, Less Than Twelve Months	80,103	164,797
Gross Unrealized Losses, Twelve Months or More	7,505	2,920
Fair Value, Twelve Months or More	229,996	104,610
Total Unrealized Losses	$ 8,683	$ 4,218
Number of Securities in an unrealized loss position, Less Than Twelve Months, Fair Value | Securities	66	81
Number of Securities in an unrealized loss position, Twelve Months or More, Fair Value | Securities	102	24
Number of Securities in an unrealized loss position, Total Unrealized Losses | Securities	168	105
Government sponsored enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	$ 0	$ 1
Fair Value, Less Than Twelve Months	0	216
Gross Unrealized Losses, Twelve Months or More	2	0
Fair Value, Twelve Months or More	170	0
Total Unrealized Losses	2	1
States and political subdivisions [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	83	142
Fair Value, Less Than Twelve Months	14,732	16,139
Gross Unrealized Losses, Twelve Months or More	168	1
Fair Value, Twelve Months or More	15,090	188
Total Unrealized Losses	251	143
Auction rate money market preferred [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	0	0
Fair Value, Less Than Twelve Months	0	0
Gross Unrealized Losses, Twelve Months or More	646	151
Fair Value, Twelve Months or More	2,554	3,049
Total Unrealized Losses	646	151
Mortgage-backed securities [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	896	454
Fair Value, Less Than Twelve Months	43,485	72,007
Gross Unrealized Losses, Twelve Months or More	4,384	1,896
Fair Value, Twelve Months or More	124,253	76,065
Total Unrealized Losses	5,280	2,350
Collateralized mortgage obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Gross Unrealized Losses, Less Than Twelve Months	199	701
Fair Value, Less Than Twelve Months	21,886	76,435
Gross Unrealized Losses, Twelve Months or More	2,305	872
Fair Value, Twelve Months or More	87,929	25,308
Total Unrealized Losses	$ 2,504	$ 1,573

XML

AFS Securities (Roll-forward of credit related impairment recognized in earnings) (Details) - Available-for-sale Securities [Member] - Auction Rate Securities [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other-than-temporary Impairment Loss, Debt Securities, Available-for-sale [Abstract]
Balance at beginning of the period	$ 770	$ 770	$ 0
Additions to credit losses for which no previous OTTI was recognized	0	0	770
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Securities Sold	0	0	0
Balance at end of the period	$ 770	$ 770	$ 770

XML

AFS Securities (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
AFS securities impairment loss	$ 0	$ 0	$ 770

XML

Loans and ALLL (Summary of changes in ALLL by segments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans and Leases Receivable, Allowance	$ 8,375	$ 7,700
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	7,700	7,400
Allowance for loan losses, Charge-offs	(1,101)	(771)
Allowance for loan losses, Recoveries	798	818
Allowance for loan losses, Provision for loan losses	978	253	$ (135)
Allowance for loan losses, Ending Balance	8,375	7,700	7,400
Commercial [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	1,706	1,814
Allowance for loan losses, Charge-offs	(626)	(265)
Allowance for loan losses, Recoveries	328	453
Allowance for loan losses, Provision for loan losses	1,155	(296)
Allowance for loan losses, Ending Balance	2,563	1,706	1,814
Agricultural [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	611	884
Allowance for loan losses, Charge-offs	0	0
Allowance for loan losses, Recoveries	0	0
Allowance for loan losses, Provision for loan losses	164	(273)
Allowance for loan losses, Ending Balance	775	611	884
Residential Real Estate [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	2,563	2,664
Allowance for loan losses, Charge-offs	(151)	(200)
Allowance for loan losses, Recoveries	261	206
Allowance for loan losses, Provision for loan losses	(681)	(107)
Allowance for loan losses, Ending Balance	1,992	2,563	2,664
Consumer [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	900	624
Allowance for loan losses, Charge-offs	(324)	(306)
Allowance for loan losses, Recoveries	209	159
Allowance for loan losses, Provision for loan losses	72	423
Allowance for loan losses, Ending Balance	857	900	624
Unallocated [Member]
Summary of changes in the ALLL and the recorded investment in loans by segments
Allowance for loan losses, Beginning Balance	1,920	1,414
Allowance for loan losses, Charge-offs	0	0
Allowance for loan losses, Recoveries	0	0
Allowance for loan losses, Provision for loan losses	268	506
Allowance for loan losses, Ending Balance	$ 2,188	$ 1,920	$ 1,414

XML

Loans and ALLL (Summary of recorded investment in loans by segments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	$ 1,938	$ 2,130
Collectively evaluated for impairment, ALLL	6,437	5,570
Total, ALLL	8,375	7,700	$ 7,400
Individually evaluated for impairment, Loans	31,099	26,653
Collectively evaluated for impairment, Loans	1,097,608	1,064,866
Total	1,128,707	1,091,519
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	443	650
Collectively evaluated for impairment, ALLL	2,120	1,056
Total, ALLL	2,563	1,706	1,814
Individually evaluated for impairment, Loans	9,899	8,099
Collectively evaluated for impairment, Loans	649,630	626,660
Total	659,529	634,759
Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	132	0
Collectively evaluated for impairment, ALLL	643	611
Total, ALLL	775	611	884
Individually evaluated for impairment, Loans	14,298	10,598
Collectively evaluated for impairment, Loans	112,863	117,671
Total	127,161	128,269
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	1,363	1,480
Collectively evaluated for impairment, ALLL	629	1,083
Total, ALLL	1,992	2,563	2,664
Individually evaluated for impairment, Loans	6,893	7,939
Collectively evaluated for impairment, Loans	268,450	264,429
Total	275,343	272,368
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0	0
Collectively evaluated for impairment, ALLL	857	900
Total, ALLL	857	900	624
Individually evaluated for impairment, Loans	9	17
Collectively evaluated for impairment, Loans	66,665	56,106
Total	66,674	56,123
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Individually evaluated for impairment, ALLL	0	0
Collectively evaluated for impairment, ALLL	2,188	1,920
Total, ALLL	$ 2,188	$ 1,920	$ 1,414

XML

Loans and ALLL (Credit quality indicators for commercial and agricultural credit exposures) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Total	$ 1,128,707	$ 1,091,519
Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	659,529	634,759
Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	497,687	481,654
Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	150,049	141,024
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,793	12,081
Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	127,161	128,269
Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	87,320	88,165
Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	39,841	40,104
Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	786,690	763,028
1 - Excellent [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	52	340
1 - Excellent [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	21	24
1 - Excellent [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	31	316
1 - Excellent [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
1 - Excellent [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	79	34
1 - Excellent [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	51	0
1 - Excellent [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	28	34
1 - Excellent [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	131	374
2 - High quality [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	18,037	20,664
2 - High quality [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,564	8,402
2 - High quality [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	13,473	12,262
2 - High quality [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
2 - High quality [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	3,342	3,933
2 - High quality [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,729	2,909
2 - High quality [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	613	1,024
2 - High quality [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	21,379	24,597
3 - High satisfactory [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	182,565	190,575
3 - High satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	127,573	131,826
3 - High satisfactory [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	43,199	46,668
3 - High satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,793	12,081
3 - High satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	25,364	29,939
3 - High satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	18,325	21,072
3 - High satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,039	8,867
3 - High satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	207,929	220,514
4 - Low satisfactory [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	429,554	401,757
4 - Low satisfactory [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	344,920	326,166
4 - Low satisfactory [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	84,634	75,591
4 - Low satisfactory [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
4 - Low satisfactory [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	65,980	66,302
4 - Low satisfactory [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	46,636	47,835
4 - Low satisfactory [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	19,344	18,467
4 - Low satisfactory [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	495,534	468,059
5 - Special mention [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	18,134	12,875
5 - Special mention [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	12,847	8,986
5 - Special mention [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,287	3,889
5 - Special mention [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
5 - Special mention [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,144	19,039
5 - Special mention [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	10,520	10,493
5 - Special mention [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	5,624	8,546
5 - Special mention [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	34,278	31,914
6 - Substandard [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	9,430	7,819
6 - Substandard [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	7,428	5,521
6 - Substandard [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,002	2,298
6 - Substandard [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
6 - Substandard [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	11,303	7,072
6 - Substandard [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,343	4,325
6 - Substandard [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,960	2,747
6 - Substandard [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	20,733	14,891
7 - Vulnerable [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,757	729
7 - Vulnerable [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	334	729
7 - Vulnerable [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,423	0
7 - Vulnerable [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
7 - Vulnerable [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	4,949	1,950
7 - Vulnerable [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,716	1,531
7 - Vulnerable [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,233	419
7 - Vulnerable [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	6,706	2,679
8 - Doubtful [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
8 - Doubtful [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	0	0
Loss [Member] | Commercial And Agricultural Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 0	$ 0

XML

Loans and ALLL (Past due and current loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	$ 113	$ 395
Nonaccrual	7,260	3,027
Total Past Due and Nonaccrual	11,412	9,836
Current	1,117,295	1,081,683
Total	1,128,707	1,091,519
Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	72
Nonaccrual	1,757	729
Total Past Due and Nonaccrual	2,722	2,518
Current	656,807	632,241
Total	659,529	634,759
Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	54
Nonaccrual	334	729
Total Past Due and Nonaccrual	394	1,403
Current	497,293	480,251
Total	497,687	481,654
Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	18
Nonaccrual	1,423	0
Total Past Due and Nonaccrual	2,328	1,115
Current	147,721	139,909
Total	150,049	141,024
Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	0	0
Current	11,793	12,081
Total	11,793	12,081
Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	104
Nonaccrual	4,949	1,950
Total Past Due and Nonaccrual	5,377	2,367
Current	121,784	125,902
Total	127,161	128,269
Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	2,716	1,531
Total Past Due and Nonaccrual	3,144	1,805
Current	84,176	86,360
Total	87,320	88,165
Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	104
Nonaccrual	2,233	419
Total Past Due and Nonaccrual	2,233	562
Current	37,608	39,542
Total	39,841	40,104
Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	113	209
Nonaccrual	554	348
Total Past Due and Nonaccrual	3,208	4,881
Current	272,135	267,487
Total	275,343	272,368
Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	113	132
Nonaccrual	554	325
Total Past Due and Nonaccrual	3,124	4,409
Current	233,438	225,007
Total	236,562	229,416
Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	23
Total Past Due and Nonaccrual	8	102
Current	6,001	6,812
Total	6,009	6,914
Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	77
Nonaccrual	0	0
Total Past Due and Nonaccrual	76	370
Current	32,696	35,668
Total	32,772	36,038
Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	10
Nonaccrual	0	0
Total Past Due and Nonaccrual	105	70
Current	66,569	56,053
Total	66,674	56,123
Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	10
Nonaccrual	0	0
Total Past Due and Nonaccrual	95	57
Current	62,721	52,005
Total	62,816	52,062
Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Nonaccrual	0	0
Total Past Due and Nonaccrual	10	13
Current	3,848	4,048
Total	3,858	4,061
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	3,202	5,617
Financing Receivables, 30 to 59 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	337	1,364
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	60	295
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	277	1,069
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	428	123
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	428	84
Financing Receivables, 30 to 59 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	39
Financing Receivables, 30 to 59 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,332	4,080
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,254	3,718
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	2	69
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	76	293
Financing Receivables, 30 to 59 Days Past Due [Member] | Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	105	50
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	95	37
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	10	13
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	837	797
Financing Receivables, 60 to 89 Days Past Due [Member] | Total commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	628	353
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	325
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	628	28
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Advances to Mortgage Brokers Segment [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total agricultural [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	190
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	190
Financing Receivables, 60 to 89 Days Past Due [Member] | Agricultural other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	209	244
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate senior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	203	234
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate junior liens [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	6	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate home equity lines of credit [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Total consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer secured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	10
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer unsecured [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0

XML

Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	$ 11,263	$ 12,944
Impaired loans without a valuation allowance, Outstanding Balance	19,836	13,709
Impaired loans, Outstanding Balance	31,099	26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	11,960	13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance	20,439	14,083
Impaired loans, Unpaid Principal Balance	32,399	27,959
Impaired loans, Valuation Allowance	1,938	2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	13,973	14,442
Impaired loans without a valuation allowance, Average Outstanding Balance	16,532	10,873
Impaired loans, Average Outstanding Balance	30,505	25,315
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	406	695
Impaired loans without a valuation allowance, Interest Income Recognized	986	586
Impaired loans, Interest Income Recognized	1,392	1,281
Total commercial [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	9,899	8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	10,401	8,462
Impaired loans, Valuation Allowance	443	650
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	9,890	7,866
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	301	504
Commercial real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	3,969	4,089
Impaired loans without a valuation allowance, Outstanding Balance	2,794	1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	4,211	4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,947	1,865
Impaired loans, Valuation Allowance	437	626
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	4,589	4,608
Impaired loans without a valuation allowance, Average Outstanding Balance	2,728	1,585
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	129	277
Impaired loans without a valuation allowance, Interest Income Recognized	74	111
Commercial other [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	12	995
Impaired loans without a valuation allowance, Outstanding Balance	3,124	1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	12	995
Impaired loans without a valuation allowance, Unpaid Principal Balance	3,231	1,224
Impaired loans, Valuation Allowance	6	24
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	1,040	1,427
Impaired loans without a valuation allowance, Average Outstanding Balance	1,533	246
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	55	93
Impaired loans without a valuation allowance, Interest Income Recognized	43	23
Total agricultural [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	14,298	10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	14,341	10,598
Impaired loans, Valuation Allowance	132	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	12,969	8,932
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	960	433
Agricultural real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	392	0
Impaired loans without a valuation allowance, Outstanding Balance	7,618	7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	392	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	7,618	7,913
Impaired loans, Valuation Allowance	112	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	606	0
Impaired loans without a valuation allowance, Average Outstanding Balance	7,559	6,421
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	50	0
Impaired loans without a valuation allowance, Interest Income Recognized	585	307
Agricultural other [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	44	0
Impaired loans without a valuation allowance, Outstanding Balance	6,244	2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	44	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	6,287	2,685
Impaired loans, Valuation Allowance	20	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	168	17
Impaired loans without a valuation allowance, Average Outstanding Balance	4,636	2,494
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	46	0
Impaired loans without a valuation allowance, Interest Income Recognized	279	126
Total residential real estate [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	6,893	7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	7,648	8,882
Impaired loans, Valuation Allowance	1,363	1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	7,634	8,496
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	131	344
Residential real estate senior liens [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	6,834	7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	7,289	8,459
Impaired loans, Valuation Allowance	1,361	1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	7,545	8,296
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	126	323
Residential real estate junior liens [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	12	44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	12	44
Impaired loans, Valuation Allowance	2	7
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	25	71
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	0	2
Residential real estate home equity lines of credit [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Outstanding Balance	0	0
Impaired loans without a valuation allowance, Outstanding Balance	47	79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans with a valuation allowance, Unpaid Principal Balance	0	0
Impaired loans without a valuation allowance, Unpaid Principal Balance	347	379
Impaired loans, Valuation Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans with a valuation allowance, Average Outstanding Balance	0	23
Impaired loans without a valuation allowance, Average Outstanding Balance	64	106
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans with a valuation allowance, Interest Income Recognized	0	0
Impaired loans without a valuation allowance, Interest Income Recognized	5	19
Total consumer [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans, Outstanding Balance	9	17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans, Unpaid Principal Balance	9	17
Impaired loans, Valuation Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans, Average Outstanding Balance	12	21
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans, Interest Income Recognized	0	0
Consumer secured [Member]
Impaired Financing Receivable, Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Outstanding Balance	9	17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]
Impaired loans without a valuation allowance, Unpaid Principal Balance	9	17
Impaired Financing Receivable, Average Recorded Investment [Abstract]
Impaired loans without a valuation allowance, Average Outstanding Balance	12	21
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]
Impaired loans without a valuation allowance, Interest Income Recognized	$ 0	$ 0

XML

Loans and ALLL (Summary of information pertaining to TDRs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	45	28
Pre-Modification Recorded Investment	$ 8,379	$ 8,266
Post-Modification Recorded Investment	$ 8,356	$ 8,266
Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	4	6
Pre-Modification Recorded Investment	$ 1,360	$ 1,702
Post-Modification Recorded Investment	$ 1,360	$ 1,702
Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	31	15
Pre-Modification Recorded Investment	$ 6,318	$ 6,092
Post-Modification Recorded Investment	$ 6,295	$ 6,092
Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	7
Pre-Modification Recorded Investment	$ 701	$ 472
Post-Modification Recorded Investment	$ 701	$ 472
Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	10	6
Pre-Modification Recorded Investment	$ 701	$ 464
Post-Modification Recorded Investment	$ 701	$ 464
Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Recorded Investment	$ 0	$ 8
Post-Modification Recorded Investment	$ 0	$ 8
Below Market Interest Rate and Extension of Amortization Period [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	23	16
Pre-Modification Recorded Investment	$ 5,377	$ 6,286
Below Market Interest Rate and Extension of Amortization Period [Member] | Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	6
Pre-Modification Recorded Investment	$ 1,186	$ 1,702
Below Market Interest Rate and Extension of Amortization Period [Member] | Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	13	4
Pre-Modification Recorded Investment	$ 3,693	$ 4,120
Below Market Interest Rate and Extension of Amortization Period [Member] | Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	6
Pre-Modification Recorded Investment	$ 498	$ 464
Below Market Interest Rate and Extension of Amortization Period [Member] | Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	7	6
Pre-Modification Recorded Investment	$ 498	$ 464
Below Market Interest Rate and Extension of Amortization Period [Member] | Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	0
Pre-Modification Recorded Investment	$ 0	$ 0
Interest Rate Below Market Reduction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	22	12
Pre-Modification Recorded Investment	$ 3,002	$ 1,980
Interest Rate Below Market Reduction [Member] | Commercial other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	1	0
Pre-Modification Recorded Investment	$ 174	$ 0
Interest Rate Below Market Reduction [Member] | Agricultural other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	18	11
Pre-Modification Recorded Investment	$ 2,625	$ 1,972
Interest Rate Below Market Reduction [Member] | Total residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	1
Pre-Modification Recorded Investment	$ 203	$ 8
Interest Rate Below Market Reduction [Member] | Residential real estate senior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	3	0
Pre-Modification Recorded Investment	$ 203	$ 0
Interest Rate Below Market Reduction [Member] | Residential real estate junior liens [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1
Pre-Modification Recorded Investment	$ 0	$ 8

XML

Loans and ALLL (Summary of Defaulted TDRs) (Details) - loan	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0

XML

Loans and ALLL (Summary of TDR loan balances) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Receivables [Abstract]
Troubled debt restructurings	$ 26,951	$ 26,197

XML

Loans and ALLL (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018 USD ($) NumberofLoan	Dec. 31, 2017 USD ($) NumberofLoan	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | loan			0	0
Restructure of Loans through Forbearance of Principal or Accrued Interest | NumberofLoan	0	0
Migration analysis of loan portfolio period			5 years
Threshold period of continuous performance to return loans to accrual status			6 months
Advance in connection with impaired loans	$ 542	$ 472	$ 542	$ 472
Minimum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			10 days
Minimum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			30 days
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term			30 years
Maximum [Member] | 4 - Low satisfactory [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			30 days
Maximum [Member] | 5 - Special mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquency period			60 days
Commercial, Agricultural, and Residential Portfolio Segments [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of days past due (or more), accrual of interest discontinued			90 days
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum days of consumer loan charged off			180 days
Consumer [Member] | Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, amortization term			15 years
Commercial and Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			0.80
Commercial and Agricultural [Member] | Customer Concentration Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum amount of loans			$ 15,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			1
Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income			0.28
Maximum percentage of debt servicing over gross income			0.40
Maximum amount without corporation approval			$ 1,000
Residential, Privately Insured, Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of loan			0.80

XML

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Total	$ 71,261	$ 69,463
Less: accumulated depreciation	43,446	41,013
Premises and equipment, net	27,815	28,450
Land [Member]
Property, Plant and Equipment [Line Items]
Total	6,336	6,336
Buildings and improvements [Member]
Property, Plant and Equipment [Line Items]
Total	30,100	29,661
Furniture and equipment [Member]
Property, Plant and Equipment [Line Items]
Total	$ 34,825	$ 33,466

XML

Premises and Equipment (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 2,940	$ 2,902	$ 2,821

XML

Goodwill and Other Intangible Assets (Identifiable intangible assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Intangible Assets	$ 169
Core deposit premium resulting from acquisitions [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Intangible Assets	5,579	$ 5,579
Accumulated Amortization	5,410	5,314
Net Intangible Assets	$ 169	$ 265

XML

Goodwill and Other Intangible Assets (Estimated amortization expense) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Summary of estimated amortization expense associated with identifiable intangibles
2016	$ 71
2017	48
2018	29
2018	15
2019	2
Thereafter	4
Net Intangible Assets	$ 169

XML

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Carrying amount of goodwill	$ 48,282	$ 48,282
Amortization expense of identifiable intangible assets	$ 96	$ 119	$ 162

XML

Borrowed Funds (Borrowed funds obligations) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Debt [Line Items]
Borrowed funds	$ 340,299	$ 344,878
Borrowed funds, Rate	1.95%	1.65%
Securities Sold under Agreements to Repurchase [Member]
Schedule of Debt [Line Items]
Borrowed funds	$ 40,299	$ 54,878
Borrowed funds, Rate	0.11%	0.12%
Federal Home Loan Bank Advances [Member]
Schedule of Debt [Line Items]
Borrowed funds	$ 300,000	$ 290,000
Borrowed funds, Rate	2.20%	1.94%

XML

Deposits (Scheduled maturities of time deposits) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Scheduled maturities of time deposits
2015	$ 232,349
2016	56,051
2017	65,036
2018	41,502
2019	31,714
Thereafter	6,968
Time Deposits, Total	$ 433,620

XML

Borrowed Funds (Maturity and weighted average interest rates of FHLB advances) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Federal Home Loan Bank, Advances [Line Items]
FHLB advances		$ 300,000	$ 290,000
FHLB advances, rate		2.20%	1.94%
Fixed Rate Advances Due 2018 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 0	$ 70,000
FHLB advances, rate		0.00%	1.96%
Fixed Rate Advances Due 2019 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 100,000	$ 85,000
FHLB advances, rate		1.94%	1.87%
Fixed Rate Advances Due 2020 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 55,000	$ 35,000
FHLB advances, rate		2.18%	1.80%
Fixed Rate Advances Due 2021 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 50,000	$ 50,000
FHLB advances, rate		1.91%	1.91%
Federal Home Loan Bank, Advances, Variable Rate Due 2021 [Member] [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
Federal Home Loan Bank, Advances, Floating Rate	[1]	$ 10,000	$ 10,000
FHLB advances, rate	[1]	2.93%	1.72%
Federal Home Loan Bank, Advances, Fixed Rate Due 2022 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 20,000	$ 20,000
FHLB advances, rate		1.97%	1.97%
Fixed Rate Advances Due 2023 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 35,000	$ 10,000
FHLB advances, rate		3.17%	3.90%
Federal Home Loan Bank, Advances, Fixed Rate Due 2024 [Member] [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 20,000	$ 0
FHLB advances, rate		2.96%	0.00%
Federal Home Loan Bank, Advances, Fixed Rate Due 2026 [Member]
Federal Home Loan Bank, Advances [Line Items]
FHLB fixed rate advances		$ 10,000	$ 10,000
FHLB advances, rate		1.17%	1.17%

[1] Hedged advance (see "Derivative Instruments" section below)

XML

Deposits (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Banking and Thrift [Abstract]
Interest Expense, Time Deposits, Greater than $250,000	$ 1,280	$ 825	$ 678

XML

Borrowed Funds (Short-term borrowings) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Securities Sold under Agreements to Repurchase [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 63,133	$ 58,464
Quarter to Date Average Balance	$ 38,036	$ 55,206
Weighted Average Interest Rate During the Period	0.10%	0.13%
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 16,200	$ 5,965
Quarter to Date Average Balance	$ 3,741	$ 2,726
Weighted Average Interest Rate During the Period	1.78%	1.15%
Federal Reserve Bank Advances [Member]
Short-term Debt [Line Items]
Maximum Month End Balance	$ 0	$ 0
Quarter to Date Average Balance	$ 0	$ 43
Weighted Average Interest Rate During the Period	0.00%	1.54%

XML

Borrowed Funds (Pledged financial instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Pledged to secure borrowed funds	$ 431,430	$ 410,988
Pledged to secure repurchase agreements	40,316	54,898
Pledged for public deposits and for other purposes necessary or required by law	58,107	27,976
Total	529,853	493,862
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	40,316	54,898
State and Local Funds Purchased [Member]
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	23,268	7,332
Mortgage Backed Securities, Other [Member]
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	10,736	13,199
Collateralized Mortgage Obligations [Member]
Short-term Debt [Line Items]
Pledged Financial Instruments, Available for Sale Securities, without Single Maturity Date	$ 6,312	$ 34,367

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Borrowed Funds (Derivatives) (Details) - Cash Flow Hedging [Member] - Interest Rate Swap [Member] - Designated as Hedging Instrument [Member] - London Interbank Offered Rate (LIBOR) [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Derivative, Remaining Maturity	2 years 3 months 16 days	3 years 3 months 16 days
Pay Rate	1.56%	1.56%
Notional Amount	$ 10,000	$ 10,000
Other Assets [Member]
Derivatives, Fair Value [Line Items]
Fair Value	$ (323)	$ (291)

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Borrowed Funds (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Carrying value of securities sold under agreements to repurchase	$ 40,316	$ 54,898
Fair value of securities sold under agreements to repurchase	40,316	$ 54,898
Additional borrowing capacity	$ 150,162
Federal Funds Purchased [Member] | Minimum [Member]
Short-term Debt [Line Items]
Debt instrument, term	1 day
Federal Funds Purchased [Member] | Maximum [Member]
Short-term Debt [Line Items]
Debt instrument, term	4 days
Federal Reserve Bank Advances [Member] | Minimum [Member]
Short-term Debt [Line Items]
Debt instrument, term	1 day
Federal Reserve Bank Advances [Member] | Maximum [Member]
Short-term Debt [Line Items]
Debt instrument, term	4 days

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Off-Balance-Sheet Activities (Contractual amount of credit related financial instruments) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract Amount	$ 214,600	$ 210,721
Maximum maturity period of commitments to extend credit	1 year
Unfunded commitments under lines of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract Amount	$ 199,652	184,317
Commercial and standby letters of credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract Amount	1,723	1,622
Commitments to grant loans [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract Amount	$ 13,225	$ 24,782

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On-Balance Sheet Activities (Narrative) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Interest Rate Lock Commitments [Member]
Derivative [Line Items]
Notional Amount of undesignated commitments	$ 1,088	$ 805
Forward Contracts [Member]
Derivative [Line Items]
Notional Amount of undesignated commitments	$ 1,089	$ 1,843

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Commitments and Other Matters (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Cash reserve balances	$ 1,220	$ 1,458
Amount available for dividends without regulatory approval	$ 18,900

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Minimum Regulatory Capital Requirements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier One Capital	$ 154,705	$ 149,013
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets	12.58%	12.23%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy	$ 49,212	$ 48,744
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	6.375%	5.75%
Tier 1 capital to risk weighted assets
Actual Amount	$ 154,705	$ 149,013
Actual Ratio	12.58%	12.23%
Minimum Capital Requirement Amount	$ 49,212	$ 48,744
Minimum Capital Requirement Ratio	7.875%	7.25%
Total capital to risk weighted assets
Actual Amount	$ 163,080	$ 156,713
Actual Ratio	13.26%	12.86%
Minimum Capital Requirement Amount	$ 98,423	$ 97,488
Minimum Capital Requirement Ratio	9.875%	9.25%
Tier 1 capital to average assets
Actual Amount	$ 154,705	$ 149,013
Actual Ratio	8.72%	8.54%
Minimum Capital Requirement Amount	$ 70,996	$ 69,827
Minimum Capital Requirement Ratio	4.00%	4.00%
Isabella Bank [Member]
Common Equity Tier 1 Capital [Abstract]
Common Equity Tier One Capital	$ 143,429	$ 139,897
CommonEquityTierOneRiskBasedCapitalToRiskWeightedAssets	11.75%	11.56%
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacy	$ 48,832	$ 48,404
CommonEquityTierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets	6.375%	5.75%
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalized	$ 73,248	$ 72,605
CommonEquityTierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets	6.50%	6.50%
Tier 1 capital to risk weighted assets
Actual Amount	$ 143,429	$ 139,897
Actual Ratio	11.75%	11.56%
Minimum Capital Requirement Amount	$ 48,832	$ 48,404
Minimum Capital Requirement Ratio	7.875%	7.25%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 73,248	$ 72,605
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Total capital to risk weighted assets
Actual Amount	$ 151,804	$ 147,597
Actual Ratio	12.43%	12.20%
Minimum Capital Requirement Amount	$ 97,664	$ 96,807
Minimum Capital Requirement Ratio	9.875%	9.25%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 122,080	$ 121,009
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 capital to average assets
Actual Amount	$ 143,429	$ 139,897
Actual Ratio	8.07%	8.07%
Minimum Capital Requirement Amount	$ 71,085	$ 69,373
Minimum Capital Requirement Ratio	4.00%	4.00%
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 88,856	$ 86,717
Minimum To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%

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Computation of Earnings Per Common Share (Schedule of Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Average number of common shares outstanding for basic calculation		7,872,077	7,841,451	7,813,739
Average potential effect of common shares in the Directors Plan	[1]	200,771	192,286	185,611
Average number of common shares outstanding used to calculate diluted earnings per common share		8,072,848	8,033,737	7,999,350
NET INCOME		$ 14,021	$ 13,237	$ 13,799
Basic (in dollars per share)		$ 1.78	$ 1.69	$ 1.77
Diluted (in dollars per share)		$ 1.74	$ 1.65	$ 1.73

[1] Exclusive of shares held in the Rabbi Trust

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Benefit Plans (Changes in the defined benefit pension plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Change in benefit obligation
Benefit obligation, January 1	$ 11,381	$ 11,448
Interest cost	388	444	$ 485
Actuarial (gain) loss	(1,194)	578
Defined Benefit Plan, Benefit Obligation, Benefits Paid	1,163	1,089
Benefit obligation, December 31	9,412	11,381	11,448
Change in plan assets
Fair value of plan assets, January 1	9,469	9,325
Investment return	(541)	1,033
Contributions	0	200
Defined Benefit Plan, Plan Assets, Benefits Paid	1,163	1,089
Fair value of plan assets, December 31	7,765	9,469	9,325
Deficiency in funded status at December31, included on the consolidated balance sheets in accrued interest payable and other liabilities	(1,647)	(1,912)
Accrued benefit cost at January 1	(1,912)	(2,123)
Contributions	0	200
Net periodic cost for the year	(345)	(412)	(238)
Net change in unrecognized actuarial loss and prior service cost	610	423	520
Accrued benefit cost at December 31	$ (1,647)	$ (1,912)	$ (2,123)

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Benefit Plans (Components of net periodic benefit cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation		$ 388	$ 444	$ 485
Expected return on plan assets		(554)	(546)	(560)
Amortization of unrecognized actuarial net loss		242	279	313
Settlement loss		269	235	0
Net periodic benefit cost		$ 345	$ 412	$ 238
Scenario, Forecast [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost on benefit obligation	$ 378
Expected return on plan assets	(452)
Amortization of unrecognized actuarial net loss	214
Net periodic benefit cost	$ 140

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Benefit Plans (Actuarial assumptions used) (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	4.11%	3.48%	3.96%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate	3.48%	3.96%	4.13%
Actuarial weighted average assumptions used in determining the net periodic pension costs
Expected long-term return on plan assets	6.00%	6.00%	6.00%

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Benefit Plans (Fair values of our pension plan assets by asset category) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	$ 7,765	$ 9,469	$ 9,325
Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	7,765	9,469
Short-term investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	98	300
Short-term investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	98	300
Fixed income [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	2,924	3,815
Fixed income [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	2,924	3,815
Equity investments [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	4,743	5,354
Equity investments [Member] | Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair values of the Corporation's pension plan assets	$ 4,743	$ 5,354

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Benefit Plans (Estimated future benefit payments) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Retirement Benefits [Abstract]
2016	$ 450
2017	486
2018	479
2019	481
2020	481
Years 2021 - 2025	$ 2,540

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Benefit Plans (Components of shares eligible to be issued under the Directors Plan) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Eligible shares, unissued	16,673	31,769
Director [Member]
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Eligible shares, unissued	203,498	195,140
Eligible shares, shares held in Rabbi Trust	16,673	31,769
Eligible shares, total	220,171	226,909
Market value, unissued	$ 4,591	$ 5,513
Market value, shares held in Rabbi Trust	376	897
Market value, total	$ 4,967	$ 6,410

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Benefit Plans (Narrative) (Details) - USD ($)		12 Months Ended
	Mar. 01, 2007	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits [Abstract]
Employees contribution		100.00%
Corporation matching contribution, percent		100.00%
Employee contribution, percent		5.00%
Defined Contribution Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		$ (269,000)	$ (235,000)	$ 0
Plan expenses		743,000	713,000	686,000
Highest consecutive years of compensation	5 years
Years of service	10 years
Accumulated other comprehensive income includes net unrecognized pension cost before income taxes		3,470,000
Accumulated other comprehensive income expected to be amortized into benefit cost		140,000
Allocated Share-based Compensation Expense		45,000	38,000	70,000
Contribution approved by Board of Directors to the ESOP (Discretionary)		0
Compensation cost related to plan		$ 21,000	$ 23,000	$ 33,000
Allocated shares outstanding related to the ESOP		0	166,833,000	204,669,000
Corporation self-funded medical plan		$ 75,000
Medical expenses		2,695,000	$ 2,324,000	$ 2,150,000
Other Postretirement Benefits Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Plan expenses		$ 356,000	$ 473,000	$ 440,000
Safe Harbor 401(k) [Member]
Defined Contribution Plan Disclosure [Line Items]
Vesting percentage		100.00%
Fixed Income Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment allocation in securities		50.00%
Equity Collective Trust [Member]
Defined Benefit Plan Disclosure [Line Items]
Investment allocation in securities		50.00%

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Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,655	$ 5,385	$ 5,185
Debit Card [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,487	2,435	2,131
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,134	1,928	2,089
Investment Advice [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	702	679	616
Service Charges And Deposit Account Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 332	$ 343	$ 349

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Revenue Schedule of Revenue for Each Major Category (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 5,655	$ 5,385	$ 5,185
Debit Card [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,487	2,435	2,131
Fiduciary and Trust [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,134	1,928	2,089
Investment Advice [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	702	679	616
Service Charges And Deposit Account Fees [Member]
Disaggregation of Revenue [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 332	$ 343	$ 349

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Other Noninterest Expenses (Expenses included in other noninterest expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of expenses included in other noninterest expenses
Professional Fees, Audit, Consulting, & Legal	$ 2,263	$ 2,043	$ 1,952
FDIC insurance premiums	726	642	719
ATM and Debit Card Expense	1,036	1,181	887
Director fees	858	856	851
Loan underwriting fees	1,016	556	535
Other than Temporary Impairment Losses, Investments	0	0	770
All other	3,558	3,541	3,343
Total other	10,763	10,044	10,225
Donations and community relations	710	657	582
Marketing Expense	$ 596	$ 568	$ 586

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Federal Income Taxes (Components of the consolidated provision for federal income taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Currently payable	$ 1,088	$ 180	$ 2,630
Deferred (benefit) expense	275	2,836	(282)
Income tax expense	$ 1,363	$ 3,016	$ 2,348

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Federal Income Taxes (Reconciliation of the provision for federal income taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Federal statutory tax rate	21.00%	34.00%	34.00%
Income taxes at 34% statutory rate	$ 3,231	$ 5,526	$ 5,490
Interest income on tax exempt municipal securities	(1,106)	(1,889)	(1,938)
Earnings on corporate owned life insurance policies	(148)	(247)	(419)
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability	0	319	0
Other	231	34	(154)
Total effect of nontaxable income	(1,023)	(1,783)	(2,511)
Effect of nondeductible expenses	113	149	143
Effect of tax credits	(958)	(876)	(774)
Federal income tax expense	$ 1,363	$ 3,016	$ 2,348

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Federal Income Taxes (Significant components of our deferred tax assets and liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets
Allowance for loan losses	$ 1,304	$ 1,076
Deferred directors' fees	1,667	1,758
Employee benefit plans	81	70
Core deposit premium and acquisition expenses	752	733
Net unrecognized actuarial loss on pension plan	729	857
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Net	1,211	0
Life insurance death benefit payable	497	497
Alternative minimum tax	710	1,463
Other	716	607
Total deferred tax assets	7,667	7,061
Deferred tax liabilities
Prepaid pension cost	383	455
Premises and equipment	1,548	1,728
Accretion on securities	41	40
Core deposit premium and acquisition expenses	946	909
Net unrealized gains on available-for-sale securities	0	204
Deferred Tax Assets, Derivative Instruments	68	61
Other	1,696	1,684
Total deferred tax liabilities	4,682	5,081
Net deferred tax assets	$ 2,985	$ 1,980

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Accumulated Other Comprehensive Income (Loss) (Changes in AOCI by component) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ (2,602)	$ (2,778)	$ 221
OCI before reclassifications	(6,931)	343	(5,335)
Amounts reclassified from AOCI	345	270	763
Net unrealized gains (losses)	(6,586)	613	(4,572)
Tax effect	1,280	(70)	1,573
Unrealized gains (losses), net of tax	(5,306)	543	(2,999)
Tax Cuts and Jobs Act Reclassification to Retained Earnings		(367)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending Balance	(7,685)	(2,602)	(2,778)
Unrealized Holding Gains (Losses) on AFS Securities [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	391	30	3,536
OCI before reclassifications	(7,229)	289	(5,865)
Amounts reclassified from AOCI	0	(142)	525
Net unrealized gains (losses)	(7,229)	147	(5,340)
Tax effect	1,415	89	1,834
Unrealized gains (losses), net of tax	(5,814)	236	(3,506)
Tax Cuts and Jobs Act Reclassification to Retained Earnings		125
Cumulative Effect of New Accounting Principle in Period of Adoption	223
Ending Balance	(5,200)	391	30
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	230	164	0
OCI before reclassifications	33	43	248
Amounts reclassified from AOCI	0	0	0
Net unrealized gains (losses)	33	43	248
Tax effect	(7)	(15)	(84)
Unrealized gains (losses), net of tax	26	28	164
Tax Cuts and Jobs Act Reclassification to Retained Earnings		38
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending Balance	256	230	164
Defined Benefit Pension Plan [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(3,223)	(2,972)	(3,315)
OCI before reclassifications	265	11	282
Amounts reclassified from AOCI	345	412	238
Net unrealized gains (losses)	610	423	520
Tax effect	(128)	(144)	(177)
Unrealized gains (losses), net of tax	482	279	343
Tax Cuts and Jobs Act Reclassification to Retained Earnings		(530)
Cumulative Effect of New Accounting Principle in Period of Adoption	0
Ending Balance	(2,741)	(3,223)	$ (2,972)
AOCI Attributable to Parent [Member]
Increase (Decrease) in Accumulated Other Comprehensive Income [Roll Forward]
Tax Cuts and Jobs Act Reclassification to Retained Earnings		$ (367)
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 223

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Accumulated Other Comprehensive Income (Loss) (Components of unrealized holding gains on AFS securities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) arising during the period		$ (7,229)		$ 289		$ (5,865)
Reclassification adjustment for net realized (gains) losses included in net income		0		(142)		(245)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		0		0		770
Comprehensive income (loss) before income tax (expense) benefit		(7,229)		147		(5,340)
Tax effect	[1]	1,415		89		1,834
Unrealized gains (losses), net of tax		(5,814)		236		(3,506)
Unrealized Holding Gains (Losses) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) arising during the period		(7,229)		289		(5,865)
Reclassification adjustment for net realized (gains) losses included in net income		0		(142)		(245)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		0		0		770
Comprehensive income (loss) before income tax (expense) benefit		(7,229)		147		(5,340)
Tax effect	[1]	1,415		89		1,834
Unrealized gains (losses), net of tax		(5,814)		236		(3,506)
Unrealized Holding Gains (Losses) on AFS Securities [Member] | Auction Rate Money Market Preferred and Preferred Stocks [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) arising during the period		(495)		407		54
Reclassification adjustment for net realized (gains) losses included in net income		0		0		0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		0		0		0
Comprehensive income (loss) before income tax (expense) benefit		(495)		407		54
Tax effect		0	[2]	0	[2]	0	[1]
Unrealized gains (losses), net of tax		(495)		407		54
Unrealized Holding Gains (Losses) on AFS Securities [Member] | All Other AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized gains (losses) arising during the period		(6,734)		(118)		(5,919)
Reclassification adjustment for net realized (gains) losses included in net income		0		(142)		(245)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI for Write-down of Securities, before Tax		0		0		770
Comprehensive income (loss) before income tax (expense) benefit		(6,734)		(260)		(5,394)
Tax effect		1,415	[2]	89	[2]	1,834	[1]
Unrealized gains (losses), net of tax		$ (5,319)		$ (171)		$ (3,560)

[1] (1) See “Note 16 – Accumulated Other Comprehensive Income (Loss)” in the accompanying notes to consolidated financial statements for tax effect reconcilia

[2] Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

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Accumulated Other Comprehensive Income (Loss) (Reclassification adjustments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Other than Temporary Impairment Losses, Investments		$ 0	$ 0	$ 770
Net AFS Impairment Loss		0	0	(770)
Income before federal income tax expense		15,384	16,253	16,147
Compensation and benefits		22,609	21,525	19,170
Federal income tax expense		(1,363)	(3,016)	(2,348)
NET INCOME		14,021	13,237	13,799
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Holding Gains (Losses) on AFS Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net gains (losses) on sale of AFS securities		0	142	245
Other than Temporary Impairment Losses, Investments		0	0	(770)
Marketable Securities, Realized Gain (Loss)		0	142	(525)
Federal income tax expense	[1]	0	(48)	179
NET INCOME		0	94	(346)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Defined Benefit Pension Plan [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Compensation and benefits		345	412	238
Federal income tax expense	[1]	(72)	(140)	(81)
NET INCOME		$ 273	$ 272	$ 157

[1] Calculations are based on a federal income tax rate of 21% in 2018 and 34% in 2017 and 2016.

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Fair Value (Narrative) (Details) - Level 3 [Member]	12 Months Ended
	Dec. 31, 2017 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairments recorded on equity securities without readily determinable fair values	$ 0
Impairments recorded on goodwill and other acquisition intangibles	$ 0

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Fair Value (Quantitative information about impaired loans) (Details) - Discounted appraisal value [Member] - Level 3 [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
Discounted appraisal value at fair value	$ 20,045	$ 15,956
Loans Receivable, Collateralized By Livestock [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Loans Receivable, Collateralized By Accounts Receivable [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	50.00%	50.00%
Real Estate [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Real Estate [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Equipment [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Equipment [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	40.00%	35.00%
Cash crop inventory [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%
Cash crop inventory [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	40.00%	40.00%
Other inventory [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	45.00%	50.00%
Other inventory [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	50.00%	75.00%
Liquor License [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	75.00%	75.00%
Furniture and Fixtures [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	35.00%	35.00%
Furniture and Fixtures [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	45.00%	45.00%

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Fair Value (Quantitative information related to foreclosed assets) (Details) - Discounted appraisal value [Member] - Level 3 [Member] - Real Estate [Member]	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	20.00%	20.00%
Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items] (Deprecated 2018-01-31)
ImpairedFinancingReceivableFairValueDisclosureAppraisedValueDiscount	30.00%	30.00%

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Fair Value (Carrying amount and estimated fair value of financial instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Level 1 [Member]
ASSETS
Cash and cash equivalents	$ 73,471	$ 30,848
Mortgage loans AFS	0	0
Total loans	0	0
Less allowance for loan losses	0	0
Net loans	0	0
Accrued interest receivable	6,928	7,063
Equity securities without readily determinable fair values	0	0
OMSR	0	0
LIABILITIES
Deposits without stated maturities	859,073	811,992
Deposits with stated maturities	0	0
Borrowed funds	0	0
Accrued interest payable	826	680
Level 2 [Member]
ASSETS
Cash and cash equivalents	0	0
Mortgage loans AFS	365	1,587
Total loans	0	0
Less allowance for loan losses	0	0
Net loans	0	0
Accrued interest receivable	0	0
Equity securities without readily determinable fair values	0	0
OMSR	2,602	2,409
LIABILITIES
Deposits without stated maturities	0	0
Deposits with stated maturities	425,993	443,892
Borrowed funds	333,829	342,089
Accrued interest payable	0	0
Level 3 [Member]
ASSETS
Cash and cash equivalents	0	0
Mortgage loans AFS	0	0
Total loans	1,099,645	1,056,906
Less allowance for loan losses	8,375	7,700
Net loans	1,091,270	1,049,206
Accrued interest receivable	0	0
Equity securities without readily determinable fair values	0	0
OMSR	0	0
LIABILITIES
Deposits without stated maturities	0	0
Deposits with stated maturities	0	0
Borrowed funds	0	0
Accrued interest payable	0	0
Carrying Value [Member]
ASSETS
Cash and cash equivalents	73,471	30,848
Mortgage loans AFS	358	1,560
Total loans	1,128,707	1,091,519
Less allowance for loan losses	8,375	7,700
Net loans	1,120,332	1,083,819
Accrued interest receivable	6,928	7,063
Equity securities without readily determinable fair values	24,948	23,454
OMSR	2,434	2,409
LIABILITIES
Deposits without stated maturities	859,073	811,992
Deposits with stated maturities	433,620	453,266
Borrowed funds	340,299	344,878
Accrued interest payable	826	680
Estimated Fair Value [Member]
ASSETS
Cash and cash equivalents	73,471	30,848
Mortgage loans AFS	365	1,587
Total loans	1,099,645	1,056,906
Less allowance for loan losses	8,375	7,700
Net loans	1,091,270	1,049,206
Accrued interest receivable	6,928	7,063
OMSR	2,602	2,409
LIABILITIES
Deposits without stated maturities	859,073	811,992
Deposits with stated maturities	425,993	443,892
Borrowed funds	333,829	342,089
Accrued interest payable	$ 826	$ 680

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Fair Value (Recorded amount of assets and liabilities measured at fair value) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
AFS Securities
AFS securities	$ 494,834	$ 548,730
Debt Securities, Available-for-sale	494,834	548,730
Available-for-sale Securities, Equity Securities	0	3,577
Fair value, total	515,202	568,554
Level 1 [Member]
AFS Securities
Fair value, total	$ 0	$ 3,577
Percent of assets and liabilities measured at fair value	0.00%	0.63%
Level 2 [Member]
AFS Securities
Fair value, total	$ 495,157	$ 549,021
Percent of assets and liabilities measured at fair value	96.11%	96.56%
Level 3 [Member]
AFS Securities
Fair value, total	$ 20,045	$ 15,956
Percent of assets and liabilities measured at fair value	3.89%	2.81%
Recurring items [Member]
AFS Securities
AFS securities	$ 494,834	$ 548,730
Available-for-sale Securities, Equity Securities	0	3,577
Derivative Assets (Liabilities), at Fair Value, Net	323	291
Recurring items [Member] | Government sponsored enterprises [Member]
AFS Securities
AFS securities	170	216
Recurring items [Member] | States and political subdivisions [Member]
AFS Securities
AFS securities	190,866	208,474
Recurring items [Member] | Auction rate money market preferred [Member]
AFS Securities
AFS securities	2,554	3,049
Recurring items [Member] | Mortgage-backed securities [Member]
AFS Securities
AFS securities	184,484	208,797
Recurring items [Member] | Collateralized mortgage obligations [Member]
AFS Securities
AFS securities	116,760	128,194
Recurring items [Member] | Level 1 [Member]
AFS Securities
AFS securities	0	0
Available-for-sale Securities, Equity Securities	0	3,577
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Recurring items [Member] | Level 1 [Member] | Government sponsored enterprises [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 1 [Member] | States and political subdivisions [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 1 [Member] | Auction rate money market preferred [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 1 [Member] | Mortgage-backed securities [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 1 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 2 [Member]
AFS Securities
AFS securities	494,834	548,730
Available-for-sale Securities, Equity Securities	0	0
Derivative Assets (Liabilities), at Fair Value, Net	323	291
Recurring items [Member] | Level 2 [Member] | Government sponsored enterprises [Member]
AFS Securities
Debt Securities, Available-for-sale	170	216
Recurring items [Member] | Level 2 [Member] | States and political subdivisions [Member]
AFS Securities
Debt Securities, Available-for-sale	190,866	208,474
Recurring items [Member] | Level 2 [Member] | Auction rate money market preferred [Member]
AFS Securities
Debt Securities, Available-for-sale	2,554	3,049
Recurring items [Member] | Level 2 [Member] | Mortgage-backed securities [Member]
AFS Securities
Debt Securities, Available-for-sale	184,484	208,797
Recurring items [Member] | Level 2 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
Debt Securities, Available-for-sale	116,760	128,194
Recurring items [Member] | Level 3 [Member]
AFS Securities
AFS securities	0	0
Available-for-sale Securities, Equity Securities	0	0
Derivative Assets (Liabilities), at Fair Value, Net	0	0
Recurring items [Member] | Level 3 [Member] | Government sponsored enterprises [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 3 [Member] | States and political subdivisions [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 3 [Member] | Auction rate money market preferred [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 3 [Member] | Mortgage-backed securities [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Recurring items [Member] | Level 3 [Member] | Collateralized mortgage obligations [Member]
AFS Securities
Debt Securities, Available-for-sale	0	0
Nonrecurring items [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	20,045	15,956
Nonrecurring items [Member] | Level 1 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Nonrecurring items [Member] | Level 2 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	0	0
Nonrecurring items [Member] | Level 3 [Member]
AFS Securities
Impaired loans (net of the allowance for loan losses)	$ 20,045	$ 15,956

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Related Party Transactions (Annual activity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Annual activity
Balance, January 1	$ 4,335	$ 3,946
New loans	1,184	3,895
Repayments	(2,176)	(3,506)
Balance, December 31	$ 3,343	$ 4,335

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Related Party Transactions (Ending balances of, and contributions to the Isabella Bank Foundation) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Ending assets	$ 1,837,307	$ 1,813,130
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Common Stock, Shares Held by Related Party	44,350	44,350
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Ending assets	$ 1,731	$ 2,162	$ 2,213

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Related Party Transactions (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Employee Stock Ownership Plan (ESOP) Deposit [Member] | Subsidiaries [Member]
Related Party Transaction [Line Items]
Total deposits	$ 0	$ 266
Principal Officers and Directors and Their Affiliates [Member]
Related Party Transaction [Line Items]
Total deposits	$ 5,029	$ 5,671
Affiliated Entity [Member] | Isabella Bank Foundation [Member]
Related Party Transaction [Line Items]
Common Stock, Shares Held by Related Party	44,350	44,350

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Operating Segments (Narrative) (Details)	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting [Abstract]
Percentage of reportable segments total assets and operating results, or more	90.00%	90.00%	90.00%

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Parent Company Only Financial Information (Interim Condensed Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
ASSETS
AFS securities	$ 494,834	$ 548,730
Premises and equipment	27,815	28,450
Other assets	12,437	10,056
TOTAL ASSETS	1,837,307	1,813,130
LIABILITIES AND SHAREHOLDERS' EQUITY
Shareholders' equity	195,519	194,905	$ 187,899	$ 183,971
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	1,837,307	1,813,130
Parent Company [Member]
ASSETS
Cash on deposit at subsidiary Bank	2,499	185
Investments in subsidiaries	143,942	145,962
Premises and equipment	1,912	1,950
Other assets	51,674	52,253
TOTAL ASSETS	200,027	200,350
LIABILITIES AND SHAREHOLDERS' EQUITY
Other liabilities	4,508	5,445
Shareholders' equity	195,519	194,905
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 200,027	$ 200,350

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Parent Company Only Financial Information (Interim Condensed Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Expenses
Compensation and benefits	$ 22,609	$ 21,525	$ 19,170
Occupancy and equipment	3,263	3,133	3,227
Other	10,763	10,044	10,225
Federal income tax benefit	(1,363)	(3,016)	(2,348)
NET INCOME	14,021	13,237	13,799
Parent Company [Member]
Income
Dividends from subsidiaries	13,100	9,600	7,400
Interest income	1	2	14
Management fee and other	3,030	6,463	6,574
Total income	16,131	16,065	13,988
Expenses
Compensation and benefits	4,132	5,196	4,898
Occupancy and equipment	513	1,779	1,696
Audit and related fees	368	527	536
Other	1,615	2,566	2,120
Total expenses	6,628	10,068	9,250
Income before income tax benefit and equity in undistributed earnings of subsidiaries	9,503	5,997	4,738
Federal income tax benefit	749	91	1,058
Income before equity in undistributed earnings of subsidiaries	10,252	6,088	5,796
Undistributed earnings of subsidiaries	3,769	7,149	8,003
NET INCOME	$ 14,021	$ 13,237	$ 13,799

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Parent Company Only Financial Information (Interim Condensed Statements of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 14,021	$ 13,237	$ 13,799
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of equity securities without readily determinable fair values	(144)	40	791
Share-based payment awards	612	640	573
Depreciation	2,940	2,902	2,821
Net amortization of AFS securities	1,873	2,144	2,747
Deferred Income Tax Expense (Benefit)	275	2,836	(282)
Changes in operating assets and liabilities which used cash
Other assets	113	800	455
Accrued interest and other liabilities	358	(2,497)	550
Net cash provided by (used in) operating activities	22,010	19,721	20,240
Investing activities
Purchases of equipment and premises	(2,305)	(2,038)	(3,804)
Net cash provided by (used in) investing activities	6,470	(81,755)	(69,909)
Financing activities
Net increase (decrease) in other borrowed funds	(4,579)	7,184	27,962
Cash dividends paid on common stock	(8,169)	(7,990)	(7,645)
Proceeds from the issuance of common stock	6,864	6,177	5,023
Common stock repurchased	(7,007)	(5,181)	(4,440)
Common stock purchased for deferred compensation obligations	(401)	(420)	(383)
Net cash provided by (used in) financing activities	14,143	69,988	50,994
Increase (decrease) in cash and cash equivalents	42,623	7,954	1,325
Cash and cash equivalents at beginning of period	30,848	22,894	21,569
Cash and cash equivalents at end of period	73,471	30,848	22,894
Parent Company [Member]
Operating activities
Net income	14,021	13,237	13,799
Adjustments to reconcile net income to cash provided by operations
Undistributed earnings of subsidiaries	(3,769)	(7,149)	(8,003)
Undistributed earnings of equity securities without readily determinable fair values	(144)	40	791
Share-based payment awards	612	640	573
Depreciation	134	154	156
Deferred Income Tax Expense (Benefit)	(31)	792	147
Changes in operating assets and liabilities which used cash
Other assets	1,237	42	(44)
Accrued interest and other liabilities	(937)	(1,590)	(2,669)
Net cash provided by (used in) operating activities	11,123	6,166	4,750
Investing activities
Maturities, calls, principal repayments, and sales of AFS securities	0	249	0
Purchases of equipment and premises	(96)	(113)	(133)
Net cash provided by (used in) investing activities	(96)	136	(133)
Financing activities
Net increase (decrease) in other borrowed funds	0	0	0
Cash dividends paid on common stock	(8,169)	(7,990)	(7,645)
Proceeds from the issuance of common stock	6,864	6,177	5,023
Common stock repurchased	(7,007)	(5,181)	(4,440)
Common stock purchased for deferred compensation obligations	(401)	(420)	(383)
Net cash provided by (used in) financing activities	(8,713)	(7,414)	(7,445)
Increase (decrease) in cash and cash equivalents	2,314	(1,112)	(2,828)
Cash and cash equivalents at beginning of period	185	1,297	4,125
Cash and cash equivalents at end of period	$ 2,499	$ 185	$ 1,297

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Foreclosed Assets (Summary of Foreclosed Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Banking and Thrift [Abstract]
Total	$ 355	$ 291

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Foreclosed Assets (Foreclosed Assets Rollforward) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Banking and Thrift [Abstract]
Balance, January 1	$ 291
Balance, December 31	$ 355