INCOME TAXES (Additional Information) (Details) - USD ($)	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Line Items]
Income tax expense		$ 11,779,000	$ 7,573,000	$ 7,394,000	$ 5,558,000	$ 6,582,000	$ 6,498,000	$ 6,091,000	$ 5,962,000		$ 32,304,000	$ 25,133,000	$ 22,833,000
Statutory percentage rate of provision											35.00%	35.00%	35.00%
Deferred Tax Assets Unrealized Gain Losses On Available for Sale Securities Gross	$ (226,000)	(226,000)				386,000					$ (226,000)	$ 386,000
Deferred Tax Liabilities Allocated To Benefit Plan	625,000	$ 625,000				$ 1,100,000					$ 625,000	$ 1,100,000
Non-cash, Non-operating and Non-recurring Income Tax Provision	$ 4,100,000
Effective Income Tax Rate Reconciliation, At Federal Statutory Income Tax Rate											35.00%	35.00%	35.00%
Scenario, Plan [Member]
Income Tax Disclosure [Line Items]
Statutory percentage rate of provision										21.00%
Effective Income Tax Rate Reconciliation, At Federal Statutory Income Tax Rate										21.00%
Security Transaction [Member]
Income Tax Disclosure [Line Items]
Income tax expense											$ 11,000	$ 23,000	$ 16,000