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INCOME TAXES (Details 1) - USD ($) $ in Thousands		3 Months Ended									12 Months Ended
		Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Amount
Federal income tax expense computed by applying the statutory rate to income before income taxes											$ 13,820	$ 19,000	$ 11,161
Tax exempt interest											(1,808)	(1,661)	(1,356)
State taxes, net of federal income tax benefit											725	1,090	1,087
Deferred tax asset remeasurement	[1]										7,572	0	0
Other											(1,363)	366	(114)
Income tax expense		$ 5,422		$ 4,703	$ 4,505	$ 4,316	$ 4,824	$ 4,663	$ 4,664	$ 4,644	$ 18,946	$ 18,795	$ 10,778
Percentage of Pre-tax Earnings
Federal income tax expense computed by applying the statutory rate to income before income taxes (as a percent)											35.00%	35.00%	35.00%
Tax exempt interest (as a percent)											(5.00%)	(3.00%)	(4.00%)
State taxes, net of federal income tax benefit (as a percent)											2.00%	2.00%	3.00%
Deferred tax asset remeasurement (as a percent)	[1]										19.00%	0.00%	0.00%
Other (as a percent)											(3.00%)	1.00%	(0.00%)
Income tax expense (as a percent)											48.00%	35.00%	34.00%
[1] 2017 amount includes a charge to write-down deferred tax assets due to the enactment of the Tax Act of $7.6 million.

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