PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ (6,916)	$ 9,443	$ 8,841	$ 9,171	$ 9,160	$ 8,851	$ 8,854	$ 8,626	$ 20,539	$ 35,491	$ 21,111
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Decrease (increase) in other assets									(5,426)	(8,331)	6,815
(Decrease) increase in other liabilities									4,194	(6,476)	10,799
Net cash (used in) provided by operating activities									46,826	44,236	31,526
Cash flows from investing activities:
Net cash used in investing activities									(411,784)	(279,545)	(451,572)
Cash flows from financing activities:
Net proceeds from issuance of subordinated debentures											78,324
Repayment of junior subordinated debentures									(352)
Net proceeds from issuance of common stock									951	48,442	779
Net proceeds from exercise of stock options										62	80
Repurchase of surrendered stock from vesting of restricted stock awards									(350)	(344)	(228)
Excess tax benefit from share based compensation											50
Cash dividends paid									(18,238)	(16,140)	(13,415)
Other, net											(303)
Net cash provided by financing activities									345,867	244,589	472,874
Net (decrease) increase in cash and cash equivalents									(19,091)	9,280	52,828
Cash and cash equivalents at beginning of period				113,838				104,558	113,838	104,558	51,730
Cash and cash equivalents at end of period	94,747				113,838				94,747	113,838	104,558
Parent Company
Cash flows from operating activities:
Net income									20,539	35,491	21,111
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in undistributed earnings of the Bank									(23,500)	(24,728)	(12,877)
Amortization									139	152	44
Decrease (increase) in other assets									18	(212)	72
(Decrease) increase in other liabilities									(398)	351	1,228
Net cash (used in) provided by operating activities									(3,202)	11,054	9,578
Cash flows from investing activities:
Investment in the Bank									0	(39,500)	(50,000)
Net cash used in investing activities									0	(39,500)	(50,000)
Cash flows from financing activities:
Net proceeds from issuance of subordinated debentures									0	0	78,324
Repayment of junior subordinated debentures									(352)	0	0
Net proceeds from issuance of common stock									951	48,442	779
Net proceeds from exercise of stock options									0	62	80
Repurchase of surrendered stock from vesting of restricted stock awards									(350)	(344)	(228)
Excess tax benefit from share based compensation									0	0	50
Cash dividends paid									(18,238)	(16,140)	(13,415)
Other, net									0	0	(303)
Net cash provided by financing activities									(17,989)	32,020	65,287
Net (decrease) increase in cash and cash equivalents									(21,191)	3,574	24,865
Cash and cash equivalents at beginning of period				$ 29,049				$ 25,475	29,049	25,475	610
Cash and cash equivalents at end of period	$ 7,858				$ 29,049				$ 7,858	$ 29,049	$ 25,475