Unaudited Consolidated Statements of Changes in Stockholders' Equity (USD $) In Thousands	Total	Preferred stock	Common stock	Additional paid-in capital from beneficial conversion feature	Additional paid-in capital	Legal surplus	Retained earnings	Treasury stock	Accumulated other comprehensive income (loss), net of tax
Beginning Balance at Dec. 31, 2009		$ 68,000	$ 25,739		$ 213,445	$ 45,279	$ 77,584	$ (17,142)	$ (82,739)
Issuance of preferred stock - beneficial conversion feature				22,711
Issuance of stock		177,289	8,740		90,896
Exercised stock options			2		19
Stock-based compensation expense					546
Common stock issuance costs					(5,246)
Preferred stock issuance costs					(10,911)
Transfer from retained earnings						1,376
Net income	12,582						12,582
Cash dividends declared on common stock							(2,644)
Cash dividends declared on preferred stock							(2,934)
Transfer to legal surplus							(1,376)
Stock used to match defined contribution plan								22
Other comprehensive income (loss), net of tax	108,101								108,101
Ending Balance at Jun. 30, 2010	729,339	245,289	34,481	22,711	288,749	46,655	83,212	(17,120)	25,362
Beginning Balance at Dec. 31, 2010	732,331	68,000	47,808		498,435	46,331	51,502	(16,732)	36,987
Stock-based compensation expense					682
Exercised restricted stock units with treasury shares					(561)			561
Transfer from retained earnings						3,083
Net income	29,548						29,548
Cash dividends declared on common stock							(4,475)
Cash dividends declared on preferred stock							(2,401)
Transfer to legal surplus							(3,083)
Stock purchased under the repurchase program								(29,242)
Stock used to match defined contribution plan								27
Other comprehensive income (loss), net of tax	(2,113)								(2,113)
Ending Balance at Jun. 30, 2011	$ 724,357	$ 68,000	$ 47,808		$ 498,556	$ 49,414	$ 71,091	$ (45,386)	$ 34,874