SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Additional Information) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Summary of Significant Accounting Policies [Line Items]
Accrued Interest On Loans	$ 8,900,000	$ 7,000,000
Financing Receivable, Net	150,000
Equity Method Investments	5,100,000	3,400,000
Real Estate Acquired Through Foreclosure	153,000	210,000
Servicing fees	$ 987,000	$ 957,000	$ 930,000
Treasury Stock Share	158,222	143,411
Bank Owned Life Insurance	$ 74,006,000	$ 69,698,000
Cash on hand or on deposit to meet regulatory reserve and clearing requirements	11,200,000	2,300,000
Carrying value of mortgage servicing rights	2,700,000	2,600,000
Unpaid principal balances	341,000,000	335,800,000
Escrow Deposit	1,500,000	1,400,000
Cash Available for Distributions	1,300,000
Operating Lease Obligations	4,700,000
Estimated Income Tax Benefits Expense And Current Tax Liability For Year 2017	1,000,000
Interest Rate Swap [Member]
Summary of Significant Accounting Policies [Line Items]
Notional amount	231,100,000	162,500,000
Fair value of interest rate swap asset	2,600,000	1,700,000
Fair value of interest rate swap liability	2,700,000	1,700,000
Life Insurance [Member] | Officer [Member]
Summary of Significant Accounting Policies [Line Items]
Bank Owned Life Insurance	71,700,000	67,600,000
Deferred Compensation Plan [Member] | Officer [Member]
Summary of Significant Accounting Policies [Line Items]
Bank Owned Life Insurance	$ 2,300,000	$ 2,100,000
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