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