INCOME TAXES (Additional Information) (Details) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Line Items]
Income tax expense	$ 6,582,000	$ 6,498,000	$ 6,091,000	$ 5,962,000	$ 5,878,000	$ 5,841,000	$ 5,656,000	$ 5,458,000		$ 25,133,000	$ 22,833,000	$ 22,385,000
Statutory percentage rate of provision										35.00%	35.00%	35.00%
Deferred Tax Assets Unrealized Gain Losses On Available for Sale Securities Gross	(386,000)				2,300,000					$ (386,000)	$ 2,300,000
Deferred Tax Liabilities Allocated To Benefit Plan	$ 1,100,000				$ 1,100,000					1,100,000	1,100,000
Deferred Tax Assets Non Cash Expenses									$ 431,000
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent									4.90%
Maximum
Income Tax Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent									8.00%
Minimum
Income Tax Disclosure [Line Items]
Effective Income Tax Rate Reconciliation, Tax Contingency, State and Local, Percent									6.50%
Security Transaction [Member]
Income Tax Disclosure [Line Items]
Income tax expense										$ 23,000	$ 16,000	$ (89,000)