Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands, except Share data	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		39,686,000			0
Net Income	40,043		40,043
Other comprehensive income	(23,357)			(23,357)
Stock Issued During Period, Shares, New Issues		11,380,000			9,000
Stock Issued During Period, Value, New Issues	276,181	273,964			2,217
Stock Adjustment Value Deferred Compensation	(517)
Stock Adjustment Deferred Compensation - Shares	0
Issuance of common stock - stock option and other plans, value	1,154	1,154
Issuance of common stock - stock option and other plans, shares		68,000
Issuance of common stock - restricted stock awards, net of cancelled awards, value	1,881	1,881
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		153,000
Stock Repurchased During Period, Shares		(16,000)
Stock Repurchased and Retired During Period, Value	(391)	(391)
Dividends, Preferred Stock, Cash	20
Cash dividends paid on common stock	14,219		14,219
Balance, value at Sep. 30, 2013	1,045,797	858,596	188,192	(3,208)	2,217
Balance, shares at Sep. 30, 2013		51,271,000			9,000
Balance, value at Dec. 31, 2013	1,053,249	860,562	202,514	(12,044)	2,217
Balance, shares at Dec. 31, 2013		51,265,000			9,000
Net Income	62,654		62,654
Other comprehensive income	11,549			11,549
Issuance of common stock - cashless exercise of warrants, shares		1,140,000
Issuance of common stock - cashless exercise of warrants, value	0	0
Stock Adjustment Value Deferred Compensation	(1)
Stock Adjustment Deferred Compensation - Shares	0
Issuance of common stock - stock option and other plans, value	915	915
Issuance of common stock - stock option and other plans, shares		40,000
Issuance of common stock - restricted stock awards, net of cancelled awards, value	2,041	2,041
Issuance of common stock - restricted stock awards, net of cancelled awards, shares		228,000
Stock Repurchased During Period, Shares		(24,000)
Stock Repurchased and Retired During Period, Value	(605)	(605)
Dividends, Preferred Stock, Cash	(66)
Cash dividends paid on common stock	33,525		33,525
Balance, value at Sep. 30, 2014	$ 1,096,211	$ 862,912	$ 231,577	$ (495)	$ 2,217
Balance, shares at Sep. 30, 2014		52,649,000			9,000