PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Details 2) - USD ($) $ in Thousands	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	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash flows from operating activities:
Net income									$ 35,491	$ 21,111	$ 13,763
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
(Increase) decrease in other assets									(8,331)	6,815	(5,783)
Increase (decrease) in other liabilities									(6,476)	10,799	(1,417)
Net cash provided by (used in) operating activities									44,236	31,526	25,811
Cash flows from investing activities:
Cash in lieu of fractional shares for business acquisition										24,628	2,926
Net cash used in investing activities									(279,545)	(451,572)	(170,548)
Cash flows from financing activities:
Net proceeds from issuance of subordinated debentures										78,324
Repayment of acquired unsecured debt											1,450
Net proceeds from issuance of common stock									48,442	779	631
Net proceeds from exercise of stock options									62	80	7
Repurchase of surrendered stock from vesting of restricted stock awards									(344)	(228)	(173)
Excess tax benefit from share based compensation										50	36
Cash dividends paid									(16,140)	(13,415)	(10,657)
Other, net										(303)	(192)
Net cash provided by financing activities									244,589	472,874	150,894
Net increase in cash and cash equivalents									9,280	52,828	6,157
Cash and cash equivalents at beginning of period				$ 104,558				$ 51,730	104,558	51,730	45,573
Cash and cash equivalents at end of period	$ 113,838				$ 104,558				113,838	104,558	51,730
Parent Company
Cash flows from operating activities:
Net income	9,160	$ 8,851	$ 8,854	8,626	7,995	$ 7,890	$ 463	4,763	35,491	21,111	13,763
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Equity in undistributed earnings of the Bank									(24,728)	(12,877)	(14,751)
Amortization									152	44	5
(Increase) decrease in other assets									(212)	72	76
Increase (decrease) in other liabilities									351	1,228	(48)
Net cash provided by (used in) operating activities									11,054	9,578	(955)
Cash flows from investing activities:
Investment in the Bank									(39,500)	(50,000)	(24,000)
Cash in lieu of fractional shares for business acquisition											(1)
Net cash used in investing activities									(39,500)	(50,000)	(24,001)
Cash flows from financing activities:
Net proceeds from issuance of subordinated debentures										78,324
Repayment of acquired unsecured debt											(1,450)
Net proceeds from issuance of common stock									48,442	779	631
Net proceeds from exercise of stock options									62	80	7
Repurchase of surrendered stock from vesting of restricted stock awards									(344)	(228)	(173)
Excess tax benefit from share based compensation										50	36
Cash dividends paid									(16,140)	(13,415)	(10,657)
Other, net										(303)	(192)
Net cash provided by financing activities									32,020	65,287	(11,798)
Net increase in cash and cash equivalents									3,574	24,865	(36,754)
Cash and cash equivalents at beginning of period				$ 25,475				$ 610	25,475	610	37,364
Cash and cash equivalents at end of period	$ 29,049				$ 25,475				$ 29,049	$ 25,475	$ 610