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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 02, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Accrued Interest On Loans |  | $ 11,800,000 | $ 11,000,000 |  |
Financing Receivable, Net |  | 250,000 |  |  |
Equity Method Investments |  | 7,000,000 | 5,300,000 |  |
Real Estate Acquired Through Foreclosure |  | 316,000 | 40,000 |  |
Servicing fees |  | $ 1,100,000 | $ 1,000,000 | $ 987,000 |
Treasury Stock Share |  | 172,959 | 168,970 |  |
Bank Owned Life Insurance |  | $ 77,106,000 | $ 75,879,000 |  |
Cash on hand or on deposit to meet regulatory reserve and clearing requirements |  | 6,400,000 | 10,500,000 |  |
Carrying value of mortgage servicing rights |  | 3,300,000 | 3,000,000 |  |
Unpaid principal balances |  | 343,500,000 | 344,400,000 |  |
Escrow Deposit |  | 1,600,000 | 1,500,000 |  |
Cash Available for Distributions |  | 2,100,000 | $ 1,000,000 |  |
Operating Lease Obligations |  | $ 5,500,000 |  |  |
Percentage Of Interest Income In Net Revenue | 80.00% |  |  |  |
Percentage Of Noninterest Income In Net Revenue | 20.00% |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00% | 35.00% |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification to Unappropriated Retained Earnings |  |  |  |  | $ 173,000
Accounting Standards Update 2016-01 [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Reclassification to Unappropriated Retained Earnings |  | $ 68,000 |  |  |
Accounting Standards Update 2017-08 [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Cumulative Effect on Retained Earnings, Net of Tax |  | 1,300,000 |  |  |
Retained Earnings [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 24,000 |  |  |  |
Interest Rate Swap [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Notional amount |  | 258,000,000 | $ 229,600,000 |  |
Fair value of interest rate swap asset |  | 3,900,000 | 2,400,000 |  |
Fair value of interest rate swap liability |  | 4,000,000 | 2,600,000 |  |
Life Insurance [Member] | Officer [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Bank Owned Life Insurance |  | 73,900,000 | 73,000,000 |  |
Deferred Compensation Plan [Member] | Officer [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Bank Owned Life Insurance |  | $ 3,200,000 | $ 2,900,000 |  |
Premises Assets [Member] | Minimum [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 5 years |  |  |
Premises Assets [Member] | Maximum [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 40 years |  |  |
Equipment [Member] | Minimum [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 3 years |  |  |
Equipment [Member] | Maximum [Member] |  |  |  |  |
Summary of Significant Accounting Policies [Line Items] |  |  |  |  |
Property, Plant and Equipment, Useful Life |  | 7 years |  |  |

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- Definition All amounts that, per contract, are due to the servicer in exchange for servicing the financial asset and would no longer be received by a servicer if the beneficial owners of the serviced assets (or their trustees or agents) were to exercise their actual or potential authority under the contract to shift the servicing to another servicer. Depending on the servicing contract, those fees may include some or all of the difference between the interest rate collected on the asset being serviced and the rate to be paid to the beneficial owners of the asset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746 + Details
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