SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2017
Accounting Policies [Abstract]
Organization	Organization The Corporation, through its wholly-owned subsidiaries, the Bank and CFS, provides a wide range of banking, financing, fiduciary and other financial services to its clients. The Corporation and the Bank are subject to the regulations of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. CRM, a wholly-owned subsidiary of the Corporation which was formed and began operations on May 31, 2016, is a Nevada-based captive insurance company which insures against certain risks unique to the operations of the Corporation and its subsidiaries and for which insurance may not be currently available or economically feasible in today's insurance marketplace. CRM pools resources with several other similar insurance company subsidiaries of financial institutions to spread a limited amount of risk among themselves. CRM is subject to regulations of the State of Nevada and undergoes periodic examinations by the Nevada Division of Insurance.
Basis of Presentation	Basis of Presentation The accompanying unaudited consolidated financial statements have been prepared in conformity with GAAP for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X of the Exchange Act. These financial statements include the accounts of the Corporation and its subsidiaries, and all significant intercompany balances and transactions are eliminated in consolidation. Amounts in the prior periods' consolidated financial statements are reclassified whenever necessary to conform to the current period's presentation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions based on available information. These estimates and assumptions affect the amounts reported in the financial statements and disclosures provided, and actual results could differ. In the opinion of management, all adjustments (consisting of normal recurring adjustments) and disclosures necessary for the fair presentation of the accompanying consolidated financial statements have been included.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09, an amendment to Revenue from Contracts with Customers (Topic 606). The objective of this amendment is to clarify the principles for recognizing revenue and to develop a common revenue standard for U.S. GAAP and IFRS. This update affects any entity that either enters into contracts with customers to transfer goods or services or enters into contracts for the transfer of nonfinancial assets unless those contracts are in the scope of other standards. In August 2015, the FASB issued ASU 2015-14 to defer for one year the effective date of the new revenue standard. The requirements are effective for annual periods and interim periods within fiscal years beginning after December 15, 2017. During 2016, the FASB issued further implementation guidance regarding revenue recognition. This additional guidance included clarification on certain principal versus agent considerations within the implementation of the guidance as well as clarification related to identifying performance obligations and licensing, assessing collectability, presenting sales taxes, measuring noncash consideration, and certain transition matters. The Corporation intends to adopt the new revenue guidance as of January 1, 2018 and does not expect a significant change upon adoption of the standard, as the new standard will not materially change the way the Corporation currently records revenue for its WMG and fee income from mortgage servicing fees, financial guarantees, and deposit related fees. In January 2016, the FASB issued ASU 2016-01, an amendment to Recognition and Measurement of Financial Assets and Financial Liabilities (Subtopic 825-10). The objectives of the ASU are to (1) require equity investments to be measured at fair value, with changes in fair value recognized in net income, (2) simplify the impairment assessment of equity investments without readily determinable fair values, (3) eliminate the requirement to disclose methods and significant assumptions used to estimate fair value for financial instruments measured at amortized cost on the balance sheet, (4) require the use of the exit price notion when measuring the fair value of financial instruments, and (5) clarify 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 amendments in this ASU are effective for public business entities for annual periods, and interim periods within those annual periods, beginning after December 15, 2017. The Corporation intends to adopt the new guidance as of January 1, 2018 and believes the ASU will not have a material impact on its consolidated financial statements, as the Corporation's equity investment portfolio is less than $1.0 million as of March 31, 2017. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). ASU 2016-02 requires companies that lease valuable assets to recognize on their balance sheets the assets and liabilities generated by contracts longer than a year. The amendments in this update are effective for annual periods, and interim periods within those annual periods, beginning after December 15, 2018, though early adoption is permitted. The Corporation intends to adopt the new lease guidance as of January 1, 2019 and is currently evaluating the impact that adoption of these updates will have on its consolidated financial statements. Currently, the Corporation believes the implementation of this ASU will create a right of use asset of less than $5.0 million for the Corporation's 13 leased facilities and a related capital obligation of the same amount as of January 1, 2019. In March 2016, the FASB issued ASU 2016-09, Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting. The objectives of the ASU are to simplify accounting for a stock payment's tax consequences and amend how excess tax benefits and a business's payments to cover the tax bills for the shares' recipients should be classified. The amendments allow companies to estimate the number of stock awards they expect to vest, and they revise the withholding requirements for classifying stock awards as equity. The amendments in this ASU are effective for public companies for fiscal years beginning after December 15, 2016, though early adoption is permitted. The adoption of ASU 2016-09 did not have a significant impact on the Corporation's consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The objective of the ASU is to provide financial statement users with more 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 by replacing the incurred loss impairment methodology in current GAAP with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to form credit loss estimates. The amendments in this ASU are effective for public companies for fiscal years beginning after December 15, 2019, though entities may adopt the amendments earlier for fiscal year beginning after December 15, 2018. The Corporation is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements. The Corporation anticipates that the adoption of the CECL model will result in an increase to the Corporation's allowance for loan losses. The Corporation has established a committee to oversee the implementation of CECL. This committee is currently assessing the data and system requirements necessary for adoption. The Corporation plans to run its current incurred loss model and a CECL model concurrently for 12 months prior to the adoption of this guidance on January 1, 2020. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The objective of the ASU is to reduce the existing diversity in practice relating to eight specific cash flow issues: (1) debt prepayment or debt extinguishment costs, (2) 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, (3) contingent consideration payments made after a business combination, (4) proceeds from the settlement of insurance claims, (5) proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies, (6) distributions received from equity method investees, (7) beneficial interests in securitization transactions, and (8) separately identifiable cash flows and application of the predominance principal. The amendments in this ASU are effective for public companies for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, though early adoption is permitted. The adoption of the ASU is not expected to have a significant impact on the Corporation's consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The objective of the ASU is to simplify the manner in which an entity is required to test goodwill for impairment by eliminating Step 2 from the goodwill impairment test. Additionally, the ASU removes the requirement for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment and, if it fails such qualitative test, to perform Step 2 of the goodwill impairment test. The amendments in this ASU are effective for annual, or any interim, goodwill impairment tests in fiscal years beginning after December 15, 2019. The adoption of the ASU is not expected to have a significant impact on the Corporation's consolidated financial statements. In March 2017, the FASB issued ASU 2017-07, Compensation - Retirement Benefits (Topic 715) - Improving the Presentation of Net Periodic Cost and Net Periodic Postretirement Benefit Cost. The objective of the ASU is to improve guidance related to the presentation of defined benefit costs in the income statement. Specifically, the ASU requires that an employer report the service cost component in the same line item(s) as other compensation costs arising from services rendered by the pertinent employees during the period. The other components of net benefit cost are required to be presented in the income statement separately from the service cost component and outside a subtotal of income from operations, if one is presented. Additionally, the ASU allows only the service cost component to be eligible for capitalization, when applicable. The amendments in this ASU are effective for annual periods beginning after December 15, 2017, including interim periods within those annual periods. The adoption of the ASU is not expected to have a significant impact on the Corporation's consolidated financial statements. In March 2017, the FASB issued ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities. The objective of the ASU is to align the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities. The amendment requires that the premium be amortized to the earlies call date, but does not require an accounting change for securities held at a discount, instead, the discount continues to be amortized to maturity. The amendments in this ASU are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2018. The adoption of the ASU is not expected to have a significant impact on the Corporation's consolidated financial statements.
Earnings Per Common Share	Basic earnings per share is net income divided by the weighted average number of common shares outstanding during the period. Issuable shares, including those related to directors’ restricted stock units and directors’ stock compensation, are considered outstanding and are included in the computation of basic earnings per share. All outstanding unvested share based payment awards that contain rights to non-forfeitable dividends are considered participating securities for this calculation. Restricted stock awards are grants of participating securities and are considered outstanding at grant date. Earnings per share information is adjusted to present comparative results for stock splits and stock dividends that occur
Fair Value Measurement	Fair value is the exchange price that would be received for an asset or paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. There are three levels of inputs that may be used to measure fair value: Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the entity has the ability to access as of the measurement date. Level 2: Significant other observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data. Level 3: Significant unobservable inputs that reflect a reporting entity's own assumptions about the assumptions that market participants would use in pricing an asset or liability. The Corporation used the following methods and significant assumptions to estimate fair value on a recurring basis: Investment Securities: The fair values of securities available for sale are usually determined by obtaining quoted prices on nationally recognized securities exchanges (Level 1 inputs), or matrix pricing, which is a mathematical technique widely used to value debt securities without relying exclusively on quoted prices for the specific securities but rather by relying on the securities' relationship to other benchmark quoted securities (Level 2 inputs). For securities where quoted prices or market prices of similar securities are not available, fair values are calculated using discounted cash flows or other market indicators (Level 3 inputs). Trading Assets: Securities that are held to fund a deferred compensation plan are recorded at fair value with changes in fair value included in earnings. The fair values of trading assets are determined by quoted market prices (Level 1 inputs). Derivatives: The fair values of interest rate swaps are based on valuation models using observable market data as of the measurement date (Level 2 inputs). Derivatives are traded in an over-the-counter market where quoted market prices are not always available. Therefore, the fair values of derivatives are determined using quantitative models that utilize multiple market inputs. The inputs will vary based on the type of derivative, but could include interest rates, prices, and indices to generate continuous yield or pricing curves, prepayment rates, and volatility factors to value the position. The Corporation also incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counter-party's nonperformance risk in the fair value measurements. In adjusting the fair value of its derivative contracts for the effect of nonperformance risk, the Corporation has considered the impact of any applicable credit enhancements, such as collateral postings. Although the Corporation has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with its derivatives utilize credit default rate assumptions (Level 3 inputs). The fair values of credit risk participations are based on credit default rate assumptions (Level 3 inputs).