CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Assets
Cash and interest-bearing deposits in banks	$ 46,297,000	$ 26,775,000
Other assets	8,594,000	5,831,000
Total assets	1,851,728,000	1,396,756,000
Liabilities:
Notes payable	29,128,000	0
Junior subordinated debentures	29,384,000	15,465,000
Other	10,624,000	8,570,000
Total liabilities	1,662,487,000	1,234,919,000
Stockholders' equity:
Total shareholders' equity	189,241,000	161,837,000	136,653,000	129,277,000
Total liabilities and stockholders' equity	1,851,728,000	1,396,756,000
Expenses:
Interest on short- and long-term debt	756,000	807,000	953,000
Professional fees	2,022,000	2,518,000	1,787,000
Loss before equity in undistributed earnings of subsidiaries and income taxes	13,421,000	5,037,000	6,748,000
Income tax benefit	(3,779,000)	(564,000)	(968,000)
Net earnings	9,642,000	4,473,000	5,780,000
Cash flows from operating activities:
Net earnings	9,642,000	4,473,000	5,780,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Net cash provided by operating activities	17,947,000	13,204,000	17,263,000
Cash flows from investing activities:
Net cash (used in) provided by investing activities	(5,296,000)	(47,506,000)	27,428,000
Cash flows from financing activities:
Proceeds from issuance of common stock	0	0	4,768,000
Proceeds from issuance of Series B preferred stock	0	32,000,000	0
Proceeds from exercise of stock options	100,000	67,000	51,000
Payment of preferred dividends	(1,579,000)	(938,000)	(1,001,000)
Payment of common dividends	(2,932,000)	(2,725,000)	(2,507,000)
Net cash (used in) provided by financing activities	(22,381,000)	25,698,000	23,865,000
Net increase (decrease) in cash and cash equivalents	(9,730,000)	(8,604,000)	68,556,000
Cash and cash equivalents, beginning of year	83,303,000	91,907,000	23,351,000
Cash and cash equivalents, end of year	73,573,000	83,303,000	91,907,000
Parent Company [Member]
Assets
Cash and interest-bearing deposits in banks	4,982,000	27,894,000
Other assets	2,233,000	174,000
Investment in and advances to subsidiaries	217,049,000	151,166,000
Total assets	224,264,000	179,234,000
Liabilities:
Dividends payable	1,113,000	1,144,000
Notes payable	2,000,000	0
Junior subordinated debentures	29,384,000	15,465,000
Other	2,526,000	788,000
Total liabilities	35,023,000	17,397,000
Stockholders' equity:
Total shareholders' equity	189,241,000	161,837,000
Total liabilities and stockholders' equity	224,264,000	179,234,000
Revenue:
Dividends from Bank and nonbank subsidiaries	0	0	0
Rental and other income	102,000	908,000	1,032,000
Total revenue	102,000	908,000	1,032,000
Expenses:
Interest on short- and long-term debt	984,000	971,000	974,000
Professional fees	804,000	337,000	185,000
Other expenses	1,126,000	643,000	667,000
Total expenses	2,914,000	1,951,000	1,826,000
Loss before equity in undistributed earnings of subsidiaries and income taxes	(2,812,000)	(1,043,000)	(794,000)
Equity in undistributed earnings of subsidiaries	11,477,000	5,167,000	6,303,000
Income tax benefit	977,000	349,000	271,000
Net earnings	9,642,000	4,473,000	5,780,000
Cash flows from operating activities:
Net earnings	9,642,000	4,473,000	5,780,000
Adjustments to reconcile net earnings to net cash provided by operating activities:
Undistributed earnings of subsidiaries	(11,477,000)	(5,167,000)	(6,303,000)
Other, net	(2,307,000)	144,000	32,000
Net cash provided by operating activities	(4,142,000)	(550,000)	(491,000)
Cash flows from investing activities:
Sale of equity securities	0	0	75,000
Outlays for business acquisition, net of cash acquired	(14,360,000)	0	0
Investments in and advances to subsidiaries	0	(11,972,000)	0
Net cash (used in) provided by investing activities	(14,360,000)	(11,972,000)	75,000
Cash flows from financing activities:
Proceeds from issuance of common stock	0	0	4,768,000
Proceeds from issuance of Series B preferred stock	0	32,000,000	0
Payment to redeem Series A preferred stock	0	(20,000,000)	0
Proceeds from exercise of stock options	100,000	68,000	51,000
Payment of preferred dividends	(1,579,000)	(938,000)	(1,001,000)
Payment of common dividends	(2,932,000)	(2,724,000)	(2,507,000)
Other, net	1,000	0	0
Net cash (used in) provided by financing activities	(4,410,000)	8,406,000	1,311,000
Net increase (decrease) in cash and cash equivalents	(22,912,000)	(4,116,000)	895,000
Cash and cash equivalents, beginning of year	27,894,000	32,010,000	31,115,000
Cash and cash equivalents, end of year	$ 4,982,000	$ 27,894,000	$ 32,010,000