PARENT COMPANY STATEMENTS (CONDENSED STATEMENTS OF CASH FLOWS) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 35,394	$ 30,662	$ 24,543
Adjustments to net cash from operating activities:
Net cash from operating activities	50,592	51,402	45,699
Cash flow from investing activities	(58,720)	(176,733)	(119,647)
Repurchase of common stock	421	244	212
Repurchase of preferred stock	0	0	56,044
Cash flow from financing activities	135,781	169,774	78,106
Net increase in cash and cash equivalents	127,653	44,443	4,158
Cash and cash equivalents at beginning of the year	104,584	60,141	55,983
Cash and cash equivalents at end of the year	232,237	104,584	60,141
Parent Company [Member]
Cash flows from operating activities:
Net income	35,394	30,662	24,543
Adjustments to net cash from operating activities:
Equity in undistributed income of subsidiaries	(21,476)	(21,943)	(15,104)
Other changes	265	447	(1,025)
Net cash from operating activities	14,184	9,166	8,414
Cash flow from investing activities	(250)	0	0
Proceeds from issuance of common stock	894	468	1,662
Repurchase of common stock	(421)	(244)	(212)
Repurchase of preferred stock	0	0	56,044
Dividends paid	(13,630)	(10,044)	(11,227)
Cash flow from financing activities	(13,157)	(9,820)	(65,821)
Net increase in cash and cash equivalents	777	(654)	(57,407)
Cash and cash equivalents at beginning of the year	756	1,410	58,817
Cash and cash equivalents at end of the year	$ 1,533	$ 756	$ 1,410