Consolidated Statements of Changes in Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Balance at beginning of period at Dec. 31, 2012	$ 404,539	$ 81,698	$ 16,828	$ 50,359	$ 236,279	$ 16,641	$ 0	$ 2,734
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	9,742				12,488	(2,810)		64
Cash dividends declared:
Preferred	(408)				(408)
Common	(1,684)				(1,684)
Purchase of shares of common stock	(258)						(258)
Issuance of shares of common stock	1,054		39	783			232
Commitments to issue common stock	989			989
Balance at end of period at Mar. 31, 2013	413,974	81,698	16,867	52,131	246,675	13,831	(26)	2,798
Balance at beginning of period at Dec. 31, 2013	439,460	81,698	18,399	91,632	265,067	(17,336)	0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income	19,323				6,890	12,433
Cash dividends declared:
Preferred	(204)				(204)
Common	(1,845)				(1,845)
Purchase of noncontrolling interest	0							0
Purchase of shares of common stock	(606)						(606)
Issuance of shares of common stock	109		56	(531)			584
Commitments to issue common stock	1,098			1,098
Balance at end of period at Mar. 31, 2014	$ 457,335	$ 81,698	$ 18,455	$ 92,199	$ 269,908	$ (4,903)	$ (22)	$ 0