SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) - USD ($)	1 Months Ended	3 Months Ended	12 Months Ended
	Jan. 18, 2018	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 28, 2018
Summary of Significant Accounting Policies [Line Items]
Accrued Interest On Loans		$ 11,000,000	$ 11,000,000	$ 8,900,000
Financing Receivable, Net		150,000	150,000
Equity Method Investments		5,300,000	5,300,000	5,100,000
Real Estate Acquired Through Foreclosure		$ 40,000	40,000	153,000
Servicing fees			$ 1,000,000	$ 987,000	$ 957,000
Treasury Stock Share		168,970	168,970	158,222
Bank Owned Life Insurance		$ 75,879,000	$ 75,879,000	$ 74,006,000
Cash on hand or on deposit to meet regulatory reserve and clearing requirements		10,500,000	10,500,000	11,200,000
Carrying value of mortgage servicing rights		3,000,000	3,000,000	2,700,000
Unpaid principal balances		344,400,000	344,400,000	341,000,000
Escrow Deposit		1,500,000	1,500,000	1,500,000
Cash Available for Distributions		1,000,000	1,000,000	1,300,000
Operating Lease Obligations		5,200,000	$ 5,200,000
Income tax benefit off setting income tax expense and current tax liability		964,000
Percentage Of Interest Income In Net Revenue			80.00%
Percentage Of Noninterest Income In Net Revenue			20.00%
Subsequent Event [Member] | Accounting Standards Update 2018-02 [Member]
Summary of Significant Accounting Policies [Line Items]
Reclassification to Unappropriated Retained Earnings						$ 173,000
Subsequent Event [Member] | Retained Earnings [Member]
Summary of Significant Accounting Policies [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	$ 24,000
Interest Rate Swap [Member]
Summary of Significant Accounting Policies [Line Items]
Notional amount		229,600,000	$ 229,600,000	231,100,000
Fair value of interest rate swap asset		2,400,000	2,400,000	2,600,000
Fair value of interest rate swap liability		2,600,000	2,600,000	2,700,000
Life Insurance [Member] | Officer [Member]
Summary of Significant Accounting Policies [Line Items]
Bank Owned Life Insurance		73,000,000	73,000,000	71,700,000
Deferred Compensation Plan [Member] | Officer [Member]
Summary of Significant Accounting Policies [Line Items]
Bank Owned Life Insurance		$ 2,900,000	$ 2,900,000	$ 2,300,000
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