Consolidated Statements Of Changes In Shareholders' Equity (USD $) In Thousands, unless otherwise specified		Comprehensive Income [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balance at Dec. 31, 2008				$ 74,285	$ 43,327	$ 402,608	$ (13,986)	$ (57,540)	$ 448,694
Net income		7,951				7,951			7,951
Other Comprehensive Income
Change in unrealized gains/losses on securities available-for-sale, net of tax		(496)					(496)		(496)
Reclassification adjustment for net gains/losses on securities available-for-sale included in net income, net of tax		3,306					3,306		3,306
Adjustment to funded status of employee benefit plans, net of tax		4,962					4,962		4,962
Total Comprehensive Income		15,723
Preferred stock dividends and discount amortization			706			(5,913)			(5,207)
Cash dividends declared						(16,869)			(16,869)
Treasury stock issued					2,867	(4,659)		3,141	1,349
Recognition of restricted stock compensation expense					465				465
Recognition of nonstatutory stock option compensation expense					483				483
Issuance of preferred stock	[1]		104,664						104,664
Warrant for common stock issuance	[1]				4,012				4,012
Tax benefit (expense) from stock-based compensation					4				4
Balance at Dec. 31, 2009			105,370	74,285	51,158	383,118	(6,214)	(54,399)	553,318
Net income		43,480				43,480			43,480
Other Comprehensive Income
Change in unrealized gains/losses on securities available-for-sale, net of tax		452					452		452
Reclassification adjustment for net gains/losses on securities available-for-sale included in net income, net of tax		(178)					(178)		(178)
Adjustment to funded status of employee benefit plans, net of tax		(394)					(394)		(394)
Total Comprehensive Income		43,360
Preferred stock dividends and discount amortization			767			(6,201)			(5,434)
Cash dividends declared						(16,683)			(16,683)
Treasury stock issued						(1,980)		5,672	3,692
Recognition of restricted stock compensation expense					470				470
Tax benefit (expense) from stock-based compensation					46				46
Forfeitures of nonstatutory stock options					(104)				(104)
Balance at Dec. 31, 2010			106,137	74,285	51,570	401,734	(6,334)	(48,727)	578,665
Net income		47,264				47,264			47,264
Other Comprehensive Income
Change in unrealized gains/losses on securities available-for-sale, net of tax		4,356					4,356		4,356
Reclassification adjustment for net gains/losses on securities available-for-sale included in net income, net of tax		81					81		81
Adjustment to funded status of employee benefit plans, net of tax		(12,211)					(12,211)		(12,211)
Total Comprehensive Income		39,490
Redemption of preferred stock			(108,676)						(108,676)
Preferred stock dividends and discount amortization			2,539			(7,611)			(5,072)
Cash dividends declared						(16,830)			(16,830)
Treasury stock issued					(11)	(3,089)		5,046	1,946
Recognition of restricted stock compensation expense					1,133				1,133
Tax benefit (expense) from stock-based compensation					(66)				(66)
Forfeitures of restricted stock					11			(75)	(64)
Balance at Dec. 31, 2011				$ 74,285	$ 52,637	$ 421,468	$ (14,108)	$ (43,756)	$ 490,526

[1] The preferred stock issued to the U.S. Treasury in the amount of $108,676 is presented net of a discount of $4,012.