INCOME TAXES (Additional Information) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Line Items]
Income tax expense	$ 5,480,000	$ 4,679,000	$ 5,110,000	$ 3,264,000	$ 11,779,000	$ 7,573,000	$ 7,394,000	$ 5,558,000	$ 18,533,000	$ 32,304,000	$ 25,133,000
Statutory percentage rate of provision									21.00%	35.00%	35.00%
Deferred Tax Assets Unrealized Gain Losses On Available for Sale Securities Gross	1,300,000				226,000				$ 1,300,000	$ 226,000
Deferred Tax Liabilities Allocated To Benefit Plan	$ 462,000				$ 625,000				462,000	625,000
Non-cash, Non-operating and Non-recurring Income Tax Provision										4,100,000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount									(408,000)	4,137,000	$ 0
Security Transaction [Member]
Income Tax Disclosure [Line Items]
Income tax expense									$ 10,000	$ 11,000	$ 23,000