Consolidated Statements of Changes in Equity (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock	Common Stock	Capital Surplus	Retained Earnings	Accumulated Other Comprehensive Income	Treasury Stock	Noncontrolling Interest	Series B Preferred Stock	Series B Preferred Stock Preferred Stock	Series B Preferred Stock Common Stock	Series B Preferred Stock Capital Surplus	Series B Preferred Stock Accumulated Other Comprehensive Income	Series B Preferred Stock Treasury Stock	Series B Preferred Stock Noncontrolling Interest	Series C Preferred Stock	Series C Preferred Stock Preferred Stock	Series C Preferred Stock Common Stock	Series C Preferred Stock Capital Surplus	Series C Preferred Stock Accumulated Other Comprehensive Income	Series C Preferred Stock Treasury Stock	Series C Preferred Stock Noncontrolling Interest
Balance at beginning of period at Dec. 31, 2009	$ 315,057	$ 77,224	$ 16,612	$ 44,284	$ 172,487	$ 7,107	$ (5,433)	$ 2,776
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income	25,198				23,903	1,410		(115)
Sale of noncontrolling interest	32							32
Cumulative preferred dividends accrued and discount accretion	0	1,259			(1,259)
Cash dividends declared:
Preferred (in dollars per share)	(4,085)				(4,085)
Common (in dollars per share)	(6,521)				(6,521)
Purchase of shares of common stock	(211)						(211)
Issuance of shares of common stock	1,388			(582)			1,970
Commitments to issue common stock	926			926
Balance at end of period at Dec. 31, 2010	331,784	78,483	16,612	44,628	184,525	8,517	(3,674)	2,693
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income	31,638				28,044	3,630		(36)
Sale of noncontrolling interest	18							18
Cumulative preferred dividends accrued and discount accretion	0	3,215			(3,215)
Repurchase of Series B preferred stock and warrants									(83,498)	(81,698)		(1,800)
Issuance of Series C preferred stock																81,698	81,698
Cash dividends declared:
Preferred (in dollars per share)	(4,606)				(4,606)
Common (in dollars per share)	(6,566)				(6,566)
Purchase of shares of common stock	(389)						(389)
Issuance of shares of common stock	1,536			(773)			2,309
Commitments to issue common stock	1,278			1,278
Balance at end of period at Dec. 31, 2011	352,893	81,698	16,612	43,333	198,182	12,147	(1,754)	2,675
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive Income	54,345				49,792	4,494		59
Cash dividends declared:
Preferred (in dollars per share)	(3,400)				(3,400)
Common (in dollars per share)	(8,295)				(8,295)
Purchase of shares of common stock	(2,937)						(2,937)
Issuance of shares of common stock	9,779		216	4,872			4,691
Commitments to issue common stock	2,154			2,154
Balance at end of period at Dec. 31, 2012	$ 404,539	$ 81,698	$ 16,828	$ 50,359	$ 236,279	$ 16,641	$ 0	$ 2,734