Consolidated Statements of Changes in Stockholders Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Total	Preferred stock	Common stock	Retained earnings	Accumulated other comprehensive income
Beginning Balance at Dec. 31, 2011	$ 771,020	$ 50,000	$ 266,842	$ 435,144	$ 19,034
Comprehensive income:
Net income	41,379	0	0	41,379	0
Other comprehensive income, net of tax	(223)	0	0	0	(223)
Common stock transactions:
Common shares purchased and retired 25,677 and 18,333 in 2013 and 2012 respectively	(262)	0	(262)	0	0
Common shares issued 26,096 and 23,973 in 2013 and 2012 respectively	0	0	0	0	0
Non-vested common shares issued 120,873 and 122,912 in 2013 and 2012 respectively	0	0	0	0	0
10,517 and 4,689 non-vested common shares forfeited in 2013 and 2012 respectively	0	0	0	0	0
688,864 and 144,346 stock options exercised, net of 336,442 and 102,213 shares tendered in payment of option price and income tax withholding amounts in 2013 and 2012 respectively	1,326	0	1,326	0	0
Tax benefit of stock-based compensation	296	0	296	0	0
Stock-based compensation expense	2,351	0	2,351	0	0
Cash dividends declared:
Common ($.27) and ($0.36) per share in 2013 and 2012 repectively	(15,448)	0	0	(15,448)	0
Preferred (6.75%) per share in 2012	(2,569)	0	0	(2,569)	0
Ending Balance at Sep. 30, 2012	797,870	50,000	270,553	458,506	18,811
Beginning Balance at Dec. 31, 2012	751,186	0	271,335	463,860	15,991
Comprehensive income:
Net income	65,361	0	0	65,361	0
Other comprehensive income, net of tax	(23,939)	0	0	0	(23,939)
Common stock transactions:
Common shares purchased and retired 25,677 and 18,333 in 2013 and 2012 respectively	(448)	0	(448)	0	0
Common shares issued 26,096 and 23,973 in 2013 and 2012 respectively	543	0	543	0	0
Non-vested common shares issued 120,873 and 122,912 in 2013 and 2012 respectively	0	0	0	0	0
10,517 and 4,689 non-vested common shares forfeited in 2013 and 2012 respectively	0	0	0	0	0
688,864 and 144,346 stock options exercised, net of 336,442 and 102,213 shares tendered in payment of option price and income tax withholding amounts in 2013 and 2012 respectively	8,137	0	8,137	0	0
Tax benefit of stock-based compensation	1,578	0	1,578	0	0
Stock-based compensation expense	2,207	0	2,207	0	0
Cash dividends declared:
Common ($.27) and ($0.36) per share in 2013 and 2012 repectively	(11,765)	0	0	(11,765)	0
Ending Balance at Sep. 30, 2013	$ 792,860	$ 0	$ 283,352	$ 517,456	$ (7,948)