PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION (Details 3) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income									$ 21,111	$ 13,763	$ 13,093
Adjustments to reconcile net income to net cash (used in) operating activities:
Decrease (increase) in other assets									6,815	(5,783)	1,366
Increase (decrease) in other liabilities									10,799	(1,417)	3,483
Net cash used in operating activities									31,526	25,811	25,029
Cash flows from investing activities:
Cash in lieu of fractional shares for business acquisition									24,628	2,926
Net cash used in investing activities									(451,572)	(170,548)	(301,175)
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									779	631	46,237
Net proceeds from exercise of stock options									80	7	4
Repurchase of surrendered stock from exercise of stock options and vesting of restricted stock awards									(228)	(173)	(291)
Excess tax benefit from share based compensation									50	36	21
Cash dividends paid									(13,415)	(10,657)	(6,754)
Other, net									(303)	(192)
Net cash provided by financing activities									472,874	150,894	270,470
Net increase (decrease) in cash and cash equivalents									52,828	6,157	(5,676)
Cash and cash equivalents at beginning of period				$ 51,730				$ 45,573	51,730	45,573	51,249
Cash and cash equivalents at end of period	$ 104,558				$ 51,730				104,558	51,730	45,573
Parent Company
Cash flows from operating activities:
Net income	7,995	$ 7,890	$ 463	4,763	4,168	$ 4,871	$ 4,318	406	21,111	13,763	13,093
Adjustments to reconcile net income to net cash (used in) operating activities:
Equity in undistributed earnings of the Bank									(12,877)	(14,751)	(14,044)
Amortization									44	5	5
Decrease (increase) in other assets									72	76	(105)
Increase (decrease) in other liabilities									1,228	(48)	(5)
Net cash used in operating activities									9,578	(955)	(1,056)
Cash flows from investing activities:
Investment in the Bank									(50,000)	(24,000)	(6,000)
Cash in lieu of fractional shares for business acquisition										(1)
Net cash used in investing activities									(50,000)	(24,001)	(6,000)
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									779	631	46,237
Net proceeds from exercise of stock options									80	7	4
Repurchase of surrendered stock from exercise of stock options and vesting of restricted stock awards									(228)	(173)	(291)
Excess tax benefit from share based compensation									50	36	21
Cash dividends paid									(13,415)	(10,657)	(6,754)
Other, net									(303)	(192)
Net cash provided by financing activities									65,287	(11,798)	39,217
Net increase (decrease) in cash and cash equivalents									24,865	(36,754)	32,161
Cash and cash equivalents at beginning of period				$ 610				$ 37,364	610	37,364	5,203
Cash and cash equivalents at end of period	$ 25,475				$ 610				$ 25,475	$ 610	$ 37,364