Recent Accounting Pronouncements (Policies)	3 Months Ended
Mar. 31, 2018
Recent Accounting Pronouncements [Abstract]
Recent Accounting Pronouncements	Recently Adopted Accounting Standards Effective January 1, 2018, the Company early adopted the provisions of FASB ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which was issued in February 2018. ASU 2018-02 allows a reclassification from AOCI to retained earnings for stranded tax effects resulting from the newly enacted federal corporate income tax rate in the Tax Act. The Tax Act included a reduction to the Federal corporate income tax rate from 35% to 21% effective January 1, 2018. The amount of the reclassification from AOCI to retained earnings is the difference between the historical corporate income tax rate and the newly enacted rate and was accounted for as a cumulative-effect adjustment to the balance sheet. The adoption of ASU 2018-02 did not have a significant impact on the consolidated financial statements and related disclosures and resulted in a reclassification that decreased AOCI and increased retained earnings by $5.6 million, with zero net effect on total shareholders' equity. The Company utilizes the individual securities approach when releasing income tax effects from AOCI for its investment securities. Effective January 1, 2018, the Company early adopted the provisions of FASB ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which was issued in August 2017. ASU 2017-12 better aligns the accounting and reporting of hedging relationships with the economics of risk management activities. The amendments of ASU 2017-12 were applied on a modified retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-09, Compensation-Stock Compensation (Topic 718), which was issued in May 2017. ASU 2017-09 provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting. The amendments of ASU 2017-09 were applied on a prospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-07, Compensation – Retirement Benefits (Topic 715), which was issued in March 2017. ASU 2017-07 requires the service cost component of net periodic pension and post-retirement benefit cost to be reported separately in the consolidated statements of income from the other components. Additionally, the amendments in the ASU require presentation of the service cost component in the consolidated statements of income in the same line item as other employee compensation costs and presentation of the other components in a different line item from the service cost component. The amendments in ASU 2017-07 were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic post-retirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic post-retirement benefit in assets utilizing the practical expedient allowed for prior comparative period presentation permitted. The adoption of ASU 2017-07 did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), which was issued in February 2017. ASU 2017-05 clarifies the scope of ASC Subtopic 610-20 and adds guidance for partial sales of nonfinancial assets. The amendments define the term in substance nonfinancial assets and clarify that a nonfinancial asset within the scope may include nonfinancial assets transferred within a legal entity to a counterparty, in part, as a financial asset promised to a counterparty in a contract. Additionally, the amendments in the ASU clarify that an entity should identify each distinct nonfinancial asset or in substance nonfinancial assets and allocate consideration to each distinct asset. The amendments of ASU 2017-05 were applied on a modified retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which was issued in January 2017. ASU 2017-01 provides a more robust framework to use in determining when a set of assets and activities is a business and to address stakeholder feedback that the definition of a business in current GAAP is applied too broadly. The primary amendments in the ASU provide a screen to exclude transactions where substantially all of the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. The amendments of ASU 2017-01 were applied on a prospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments), issued in August 2016. ASU 2016-15 addresses diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This standard addresses the following eight specific cash flow issues: Debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. The amendments of ASU 2016-15 were applied on a retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures. Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities, which was issued in January 2016. ASU 2016-01 addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments and requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value. Any changes in fair value on equity investments with readily determinable market value will be recognized in net income unless the investments qualify for a new practicability exception. This ASU also requires entities to recognize changes in instrument-specific credit risk related to financial liabilities measured under the fair value option in OCI. The fair value measurement of loans was modified, with no significant impact, to incorporate illiquidity risk and other market factors in addition to credit risk in order to calculate the exit price fair value in accordance with ASC 820 as required by ASU 2016-01. The adoption of ASU 2016-01 did not have a significant impact on the consolidated financial statements and related disclosures and resulted in a reclassification that decreased AOCI $2.6 million, increased retained earnings by $1.5 million, decreased equity securities by $1.5 million and increased other assets $0.4 million. Effective January 1, 2018, the Company adopted the provisions of ASU 2014-09, which was issued in May 2014. ASU 2014-09 is a comprehensive new revenue recognition standard that supersedes nearly all existing revenue recognition guidance under GAAP and is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects consideration to which the entity expects to be entitled in exchange for those goods and services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The adoption included ASU 2014-09 and all related updates to clarify ASU 2014-09, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10, Identifying Performance Obligations and Licensing, ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, and ASU 2016-20, Technical Corrections and Improvements to Topic 606 - Revenue from Contracts with Customers. Management determined that the majority of revenue earned by the Company is from revenue streams not included in the scope of this standard such as interest earned from loans, investment securities and bank owned life insurance income. For applicable revenue streams such as ATM and debit card fees, insurance, other financial services revenue, service charges on deposit accounts, retirement plan administration fees and trust fees, management reviewed the applicable contracts provisions and applied the principles in the new standard for revenue recognition. The amendments of ASU 2014-09 were applied on a modified retrospective basis. There was no cumulative effect adjustment upon adoption on January 1, 2018. The adoption of ASU 2014-09 and all related ASU updates to ASC 606 did not have a significant impact on the consolidated financial statements and related disclosures as of and for the three months ended March 31, 2018. Refer to footnote 10, Revenue from Contracts with Customers, for more information.
Accounting Standards Issued Not Yet Adopted	Accounting Standards Issued Not Yet Adopted In February 2018, the FASB issued ASU 2018-03, Technical Correction and Improvement to Financial Instruments – Overall (Subtopic 825-10), to clarify certain aspects of the guidance issued in ASU 2016-01. The provisions of ASU 2018-03 are effective July 1, 2018 for interim financial statements but may be early adopted in any interim period starting January 1, 2018 as long as ASU 2016-01 is also adopted. Management is evaluating the effect that this guidance will have on the consolidated financial statements and related disclosures and does not expect the impact to be material. In March 2017, the FASB issued ASU 2017-08, Receivables – Nonrefundable Fees and Other Costs (Subtopic 310-20). ASU 2017-08 requires amortization of premiums to the earliest call date on debt securities with call features that are explicit, on contingent and callable at fixed prices on present dates. The ASU does not impact securities held at a discount; the discount continues to be amortized to the contractual maturity. The guidance is required to be applied with a modified retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the period of adoption. ASU 2017-08 is effective for the Company on January 1, 2019. Early adoption is permitted. Management is evaluating the effect that this guidance will have on the consolidated financial statements and related disclosures and does not expect the impact to be material. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. ASU 2016-13 requires the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions and reasonable and supportable forecasts. Financial institutions and other organizations will now use forward-looking information to better inform their credit loss estimates. Many of the loss estimation techniques applied today will still be permitted, although the inputs to those techniques will change to reflect the full amount of expected credit losses. In addition, ASU 2016-13 amends the accounting for credit losses on AFS debt securities and purchased financial assets with credit deterioration. ASU 2016-13 is effective for the Company on January 1, 2020. Early adoption is permitted for all organizations for fiscal years and interim periods within those fiscal years, beginning after December 15, 2018. Management is evaluating the effect that this guidance will have on the consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires lessees to recognize right of use assets and lease liabilities on the balance sheet for all leases with terms longer than 12 months. For leases with a term of 12 months or less, a lessee is permitted to make an accounting policy election by class of underlying asset not to recognize a right of use asset and lease liability. Additionally, when measuring assets and liabilities arising from a lease, optional payments should be included only if the lessee is reasonable certain to exercise an option to extend the lease, exercise a purchase option or not exercise an option to terminate the lease. In January 2018, the FASB issued ASU 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842. ASU 2018-01 was issued to address concerns about the cost and complexity of complying with the transition provisions of ASU 2018-01. Both ASU 2016-02 and ASU 2018-01 are effective for the Company on January 1, 2019. Early adoption is permitted in any interim or annual period. Management is evaluating the effect that this guidance will have on the consolidated financial statements and related disclosures.

Recently Adopted Accounting Standards

Effective January 1, 2018, the Company early adopted the provisions of FASB ASU 2018-02, Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income, which was issued in February 2018. ASU 2018-02 allows a reclassification from AOCI to retained earnings for stranded tax effects resulting from the newly enacted federal corporate income tax rate in the Tax Act. The Tax Act included a reduction to the Federal corporate income tax rate from 35% to 21% effective January 1, 2018. The amount of the reclassification from AOCI to retained earnings is the difference between the historical corporate income tax rate and the newly enacted rate and was accounted for as a cumulative-effect adjustment to the balance sheet. The adoption of ASU 2018-02 did not have a significant impact on the consolidated financial statements and related disclosures and resulted in a reclassification that decreased AOCI and increased retained earnings by $5.6 million, with zero net effect on total shareholders' equity. The Company utilizes the individual securities approach when releasing income tax effects from AOCI for its investment securities.

Effective January 1, 2018, the Company early adopted the provisions of FASB ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which was issued in August 2017. ASU 2017-12 better aligns the accounting and reporting of hedging relationships with the economics of risk management activities. The amendments of ASU 2017-12 were applied on a modified retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-09, Compensation-Stock Compensation (Topic 718), which was issued in May 2017. ASU 2017-09 provides guidance about which changes to the terms and conditions of a share-based payment award require an entity to apply modification accounting. The amendments of ASU 2017-09 were applied on a prospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-07, Compensation – Retirement Benefits (Topic 715), which was issued in March 2017. ASU 2017-07 requires the service cost component of net periodic pension and post-retirement benefit cost to be reported separately in the consolidated statements of income from the other components. Additionally, the amendments in the ASU require presentation of the service cost component in the consolidated statements of income in the same line item as other employee compensation costs and presentation of the other components in a different line item from the service cost component. The amendments in ASU 2017-07 were applied retrospectively for the presentation of the service cost component and the other components of net periodic pension cost and net periodic post-retirement benefit cost in the income statement and prospectively for the capitalization of the service cost component of net periodic pension cost and net periodic post-retirement benefit in assets utilizing the practical expedient allowed for prior comparative period presentation permitted. The adoption of ASU 2017-07 did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), which was issued in February 2017. ASU 2017-05 clarifies the scope of ASC Subtopic 610-20 and adds guidance for partial sales of nonfinancial assets. The amendments define the term in substance nonfinancial assets and clarify that a nonfinancial asset within the scope may include nonfinancial assets transferred within a legal entity to a counterparty, in part, as a financial asset promised to a counterparty in a contract. Additionally, the amendments in the ASU clarify that an entity should identify each distinct nonfinancial asset or in substance nonfinancial assets and allocate consideration to each distinct asset. The amendments of ASU 2017-05 were applied on a modified retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which was issued in January 2017. ASU 2017-01 provides a more robust framework to use in determining when a set of assets and activities is a business and to address stakeholder feedback that the definition of a business in current GAAP is applied too broadly. The primary amendments in the ASU provide a screen to exclude transactions where substantially all of the fair value of the transferred set is concentrated in a single asset, or group of similar assets, from being evaluated as a business. The amendments of ASU 2017-01 were applied on a prospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments), issued in August 2016. ASU 2016-15 addresses diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. This standard addresses the following eight specific cash flow issues: Debt prepayment or debt extinguishment costs; settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing; contingent consideration payments made after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies; distributions received from equity method investees; beneficial interests in securitization transactions; and separately identifiable cash flows and application of the predominance principle. The amendments of ASU 2016-15 were applied on a retrospective basis and adoption did not have an impact on the consolidated financial statements and related disclosures.

Effective January 1, 2018, the Company adopted the provisions of FASB ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10) – Recognition and Measurement of Financial Assets and Financial Liabilities, which was issued in January 2016. ASU 2016-01 addresses certain aspects of recognition, measurement, presentation and disclosure of financial instruments and requires entities to measure equity investments that do not result in consolidation and are not accounted for under the equity method at fair value. Any changes in fair value on equity investments with readily determinable market value will be recognized in net income unless the investments qualify for a new practicability exception. This ASU also requires entities to recognize changes in instrument-specific credit risk related to financial liabilities measured under the fair value option in OCI. The fair value measurement of loans was modified, with no significant impact, to incorporate illiquidity risk and other market factors in addition to credit risk in order to calculate the exit price fair value in accordance with ASC 820 as required by ASU 2016-01. The adoption of ASU 2016-01 did not have a significant impact on the consolidated financial statements and related disclosures and resulted in a reclassification that decreased AOCI $2.6 million, increased retained earnings by $1.5 million, decreased equity securities by $1.5 million and increased other assets $0.4 million.

Effective January 1, 2018, the Company adopted the provisions of ASU 2014-09, which was issued in May 2014. ASU 2014-09 is a comprehensive new revenue recognition standard that supersedes nearly all existing revenue recognition guidance under GAAP and is based on the principle that revenue is recognized to depict the transfer of goods or services to customers in an amount that reflects consideration to which the entity expects to be entitled in exchange for those goods and services. The ASU requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The adoption included ASU 2014-09 and all related updates to clarify ASU 2014-09, including ASU 2016-08, Principal versus Agent Considerations (Reporting Revenue Gross versus Net), ASU 2016-10, Identifying Performance Obligations and Licensing, ASU 2016-12, Narrow-Scope Improvements and Practical Expedients, and ASU 2016-20, Technical Corrections and Improvements to Topic 606 - Revenue from Contracts with Customers.

Management determined that the majority of revenue earned by the Company is from revenue streams not included in the scope of this standard such as interest earned from loans, investment securities and bank owned life insurance income. For applicable revenue streams such as ATM and debit card fees, insurance, other financial services revenue, service charges on deposit accounts, retirement plan administration fees and trust fees, management reviewed the applicable contracts provisions and applied the principles in the new standard for revenue recognition. The amendments of ASU 2014-09 were applied on a modified retrospective basis. There was no cumulative effect adjustment upon adoption on January 1, 2018. The adoption of ASU 2014-09 and all related ASU updates to ASC 606 did not have a significant impact on the consolidated financial statements and related disclosures as of and for the three months ended March 31, 2018. Refer to footnote 10, Revenue from Contracts with Customers, for more information.