CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Thousands, except Share data	Total	Preferred Stock	Common Stock	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock
Beginning Balances at Dec. 31, 2009	$ 649,958	$ 79,195	$ 490,532	$ 276,119	$ (10,487)	$ (185,401)
Beginning Balances (in shares) at Dec. 31, 2009		80,000	62,358,614			(10,924,793)
Net income	29,372			29,372
Unrealized holding gains (losses) on securities available-for-sale arising during the period	3,153				3,153
Change in retirement obligation	824				824
Unrealized loss on derivatives-Prime Swap market value adj.	(239)				(239)
Unrealized loss on derivatives-Trust Preferred Swap market value adj.	(999)				(999)
Foreign Currency Exchange	(83)				(83)
Total comprehensive income	32,028
Issuance of common stock (in shares)			6,372,117
Issuance of common stock	91,192		91,192
Preferred stock-CPP payoff (in shares)		(80,000)
Preferred stock-CPP payoff	(79,235)	(79,235)
Cash dividends declared :
Common stock at $0.24 per share in 2011 and $0.20 per share in 2010	(11,582)			(11,582)
Preferred stock	(1,100)			(1,100)
Discount on preferred stock	(765)	40		(805)
Excess tax benefit on share-based compensation	498		498
Exercise of stock options, net of shares purchased (in shares)						75,446
Exercise of stock options, net of shares purchased	(168)		(1,551)			1,383
Restricted stock awards, net of forfeitures (in shares)						181,271
Restricted stock awards, net of forfeitures	(592)		(3,631)			3,039
Share-based compensation expense	1,322		1,322
Ending Balances at Jun. 30, 2010	681,556	0	578,362	292,004	(7,831)	(180,979)
Ending Balances (in shares) at Jun. 30, 2010		0	68,730,731			(10,668,076)
Beginning Balances at Dec. 31, 2010	697,394	0	580,097	310,271	(12,044)	(180,930)
Beginning Balances (in shares) at Dec. 31, 2010		0	68,730,731			(10,665,754)
Net income	33,180			33,180
Unrealized holding gains (losses) on securities available-for-sale arising during the period	2,913				2,913
Change in retirement obligation	529				529
Unrealized loss on derivatives-Trust Preferred Swap market value adj.	391				391
Foreign Currency Exchange	309				309
Total comprehensive income	37,322
Cash dividends declared :
Common stock at $0.24 per share in 2011 and $0.20 per share in 2010	(13,996)			(13,996)
Excess tax benefit on share-based compensation	156		156
Exercise of stock options, net of shares purchased (in shares)						12,808
Exercise of stock options, net of shares purchased	(11)		(228)			217
Restricted stock awards, net of forfeitures (in shares)						181,655
Restricted stock awards, net of forfeitures	(908)		(3,974)			3,066
Share-based compensation expense	1,805		1,805
Ending Balances at Jun. 30, 2011	$ 721,762	$ 0	$ 577,856	$ 329,455	$ (7,902)	$ (177,647)
Ending Balances (in shares) at Jun. 30, 2011		0	68,730,731			(10,471,291)