Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]	Preferred Stock [Member]
Balance, value at Dec. 31, 2012	$ 764,008	$ 581,471	$ 162,388	$ 20,149	$ 0
Balance, shares at Dec. 31, 2012		39,686			0
Net Income	26,767		26,767
Other comprehensive income	(29,359)			(29,359)
Issuance of common stock - stock option and other plans, value	774	774
Issuance of common stock - stock option and other plans, shares		43
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,280	1,280
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		144
Stock Repurchased During Period, Shares		(16)
Stock Repurchased and Retired During Period, Value	(391)	(391)
Dividends, Preferred Stock, Cash	(10)
Cash dividends paid on common stock	9,093		9,093
Balance, value at Jun. 30, 2013	1,030,674	857,615	180,052	(9,210)	2,217
Balance, shares at Jun. 30, 2013		51,237			9
Balance, value at Dec. 31, 2013	1,053,249	860,562	202,514	(12,044)	2,217
Balance, shares at Dec. 31, 2013		51,265			9
Stock Adjustment Value Deferred Compensation	(1)
Net Income	41,071		41,071
Other comprehensive income	15,604			15,604
Issuance of common stock - cashless exercise of warrants, shares		1,140
Issuance of common stock - cashless exercise of warrants, value	0	0
Stock Adjustment Deferred Compensation - Shares	0
Issuance of common stock - stock option and other plans, value	425	425
Issuance of common stock - stock option and other plans, shares		21
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,224	1,224
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		233
Stock Repurchased During Period, Shares		(24)
Stock Repurchased and Retired During Period, Value	(601)	(601)
Dividends, Preferred Stock, Cash	(37)
Cash dividends paid on common stock	18,783		18,783
Balance, value at Jun. 30, 2014	$ 1,092,151	$ 861,609	$ 224,765	$ 3,560	$ 2,217
Balance, shares at Jun. 30, 2014		52,635			9