PARENT ONLY CONDENSED FINANCIAL STATEMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Activities
Net income	$ 6,560	$ 8,457	$ 7,754	$ 6,225	$ 7,398	$ 7,632	$ 7,324	$ 3,991	$ 28,996	$ 26,345	$ 27,258
Change in other assets and liabilities									4,172	5,091	1,916
Net cash provided by operating activities									43,358	60,083	54,179
Investing Activities
Proceeds from sales of securities available for sale									27,131	80,151	64,176
Cash received/(paid) from bank/branch acquisitions, net									(10,686)	18,157	5,464
Purchases of equipment									(5,593)	(7,631)	(7,387)
Net cash provided/(used) by investing activities									(48,972)	(141,392)	(39,297)
Financing Activities
Repurchase of preferred shares										(15,100)	(40,255)
Purchase of treasury shares									(319)	(204)
Repayment of subordinated debentures, net									(5,000)	(4,000)
Cash dividends on preferred stock										(470)	(1,967)
Cash dividends on common stock									(8,726)	(5,709)	(1,623)
Net cash provided/(used) by financing activities									6,779	76,979	(58,380)
Net change in cash and cash equivalents									1,165	(4,330)	(43,498)
Cash and cash equivalents, beginning of year				61,320				65,650	61,320	65,650	109,148
Cash and cash equivalents, end of year	62,485				61,320				62,485	61,320	65,650
Parent Company
Operating Activities
Net income									28,996	26,345	27,258
Undistributed (income)/loss of subsidiaries									(10,636)	2,398	13,915
Change in other assets and liabilities									3,862	1,833	2,862
Net cash provided by operating activities									22,222	30,576	44,035
Investing Activities
Capital contributed to subsidiary, net										(250)
Proceeds from sales of securities available for sale									750
Cash received/(paid) from bank/branch acquisitions, net									(13,935)
Purchases of equipment									(403)	(667)	(1,230)
Net cash provided/(used) by investing activities									(13,588)	(917)	(1,230)
Financing Activities
Proceeds from exercise of stock options									66	389	120
Repurchase of preferred shares										(15,100)	(40,255)
Purchase of treasury shares									(319)	(204)
Repayment of subordinated debentures, net									(5,000)	(4,000)
Cash dividends on preferred stock										(470)	(1,967)
Cash dividends on common stock									(8,726)	(5,709)	(1,623)
Net cash provided/(used) by financing activities									(13,979)	(25,094)	(43,725)
Net change in cash and cash equivalents									(5,345)	4,565	(920)
Cash and cash equivalents, beginning of year				11,667				7,102	11,667	7,102	8,022
Cash and cash equivalents, end of year	$ 6,322				$ 11,667				$ 6,322	$ 11,667	$ 7,102