Consolidated Statements of Changes in Stockholders Equity (Unaudited) (USD $) In Thousands	Total	Preferred stock	Common stock	Retained earnings	Accumulated other comprehensive income
Beginning Balance at Dec. 31, 2009	$ 574,434	$ 50,000	$ 112,135	$ 397,224	$ 15,075
Comprehensive income:
Net income	17,789			17,789
Other comprehensive income, net of tax	6,811				6,811
Total comprehensive income	24,600
Common stock transactions:
Common shares purchased and retired 14,112 and 246,596 in 2011 and 2010 respectively	(3,699)		(3,699)
Common shares issued 14,692 and 11,506,503 in 2011 and 2010 respectively	153,120		153,120
Non-vested common shares issued 130,904 and 117,140 in 2011 and 2010 respectively	0		0
17,544 and 3,548 non-vested common shares forfeited in 2011 and 2010 respectively	(14)		(14)
50,287 and 80,262 stock options exercised, net of 106,185 and 67,110 shares tendered in payment of option price and income tax withholding amounts in 2011 and 2010 respectively	589		589
Tax benefit of stock-based compensation	228		228
Stock-based compensation expense	958		958
Cash dividends declared:
Common ($0.225 per share)	(8,331)			(8,331)
Preferred (6.75% per share)	(1,697)			(1,697)
Ending Balance at Jun. 30, 2010	740,188	50,000	263,317	404,985	21,886
Beginning Balance at Dec. 31, 2010	736,802	50,000	264,174	413,253	9,375
Comprehensive income:
Net income	19,360			19,360
Other comprehensive income, net of tax	13,022				13,022
Total comprehensive income	32,382
Common stock transactions:
Common shares purchased and retired 14,112 and 246,596 in 2011 and 2010 respectively	(193)		(193)
Common shares issued 14,692 and 11,506,503 in 2011 and 2010 respectively	195		195
Non-vested common shares issued 130,904 and 117,140 in 2011 and 2010 respectively	0		0
17,544 and 3,548 non-vested common shares forfeited in 2011 and 2010 respectively	(89)		(89)
Nonvested liability awards vesting during the period	195		195
50,287 and 80,262 stock options exercised, net of 106,185 and 67,110 shares tendered in payment of option price and income tax withholding amounts in 2011 and 2010 respectively	102		102
Tax benefit of stock-based compensation	224		224
Stock-based compensation expense	1,031		1,031
Cash dividends declared:
Common ($0.225 per share)	(9,607)			(9,607)
Preferred (6.75% per share)	(1,697)			(1,697)
Ending Balance at Jun. 30, 2011	$ 759,345	$ 50,000	$ 265,639	$ 421,309	$ 22,397