Securities (Summaries Of Fair Values And Unrealized Losses Of Securities, Segregated By Length Of Impairment) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	$ 259,099	$ 130
Securities available for sale, Less than 12 Months, Unrealized Losses	(1,283)	(10)
Securities available for sale, Greater than 12 Months, Fair Value	11,509	11,854
Securities available for sale, Greater than 12 Months, Unrealized Losses	(14,628)	(14,906)
Securities available for sale, Fair Value, Total	270,608	11,984
Securities available for sale, Unrealized Losses, Total	(15,911)	(14,916)
Securities held to maturity, Less than 12 Months, Fair Value	173,473	18,285
Securities held to maturity, Less than 12 Months, Unrealized Losses	(754)	(75)
Securities held to maturity, Greater than 12 Months, Fair Value	7,010	6,773
Securities held to maturity, Greater than 12 Months, Unrealized Losses	(1,398)	(1,804)
Securities held to maturity, Fair Value, Total	180,483	25,058
Securities held to maturity, Unrealized Losses, Total	(2,152)	(1,879)
U.S. Treasury And Other U.S. Government Agencies And Corporations [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	169,327
Securities available for sale, Less than 12 Months, Unrealized Losses	(632)
Securities available for sale, Fair Value, Total	169,327
Securities available for sale, Unrealized Losses, Total	(632)
Agency Mortgage-Backed Securities [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	76,778
Securities available for sale, Less than 12 Months, Unrealized Losses	(66)
Securities available for sale, Fair Value, Total	76,778
Securities available for sale, Unrealized Losses, Total	(66)
Securities held to maturity, Less than 12 Months, Fair Value	143,873
Securities held to maturity, Less than 12 Months, Unrealized Losses	(471)
Securities held to maturity, Fair Value, Total	143,873
Securities held to maturity, Unrealized Losses, Total	(471)
Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Securities held to maturity, Less than 12 Months, Fair Value	19,943	12,911
Securities held to maturity, Less than 12 Months, Unrealized Losses	(88)	(11)
Securities held to maturity, Fair Value, Total	19,943	12,911
Securities held to maturity, Unrealized Losses, Total	(88)	(11)
Non-Agency Collateralized Mortgage Obligations [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	3,812	30
Securities available for sale, Less than 12 Months, Unrealized Losses	(25)	(1)
Securities available for sale, Fair Value, Total	3,812	30
Securities available for sale, Unrealized Losses, Total	(25)	(1)
Securities held to maturity, Less than 12 Months, Fair Value	5,202	5,374
Securities held to maturity, Less than 12 Months, Unrealized Losses	(114)	(64)
Securities held to maturity, Greater than 12 Months, Fair Value	4,322	4,351
Securities held to maturity, Greater than 12 Months, Unrealized Losses	(1,199)	(1,309)
Securities held to maturity, Fair Value, Total	9,524	9,725
Securities held to maturity, Unrealized Losses, Total	(1,313)	(1,373)
States Of The U.S. And Political Subdivisions [Member]
Schedule Of Securities [Line Items]
Securities held to maturity, Less than 12 Months, Fair Value	4,455
Securities held to maturity, Less than 12 Months, Unrealized Losses	(81)
Securities held to maturity, Fair Value, Total	4,455
Securities held to maturity, Unrealized Losses, Total	(81)
Collateralized Debt Obligations [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	8,453
Securities available for sale, Less than 12 Months, Unrealized Losses	(544)
Securities available for sale, Greater than 12 Months, Fair Value	6,042	5,998
Securities available for sale, Greater than 12 Months, Unrealized Losses	(13,230)	(13,226)
Securities available for sale, Fair Value, Total	14,495	5,998
Securities available for sale, Unrealized Losses, Total	(13,774)	(13,226)
Securities held to maturity, Greater than 12 Months, Fair Value	1,387	1,278
Securities held to maturity, Greater than 12 Months, Unrealized Losses	(176)	(314)
Securities held to maturity, Fair Value, Total	1,387	1,278
Securities held to maturity, Unrealized Losses, Total	(176)	(314)
Other Debt Securities [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Greater than 12 Months, Fair Value	5,467	5,197
Securities available for sale, Greater than 12 Months, Unrealized Losses	(1,398)	(1,666)
Securities available for sale, Fair Value, Total	5,467	5,197
Securities available for sale, Unrealized Losses, Total	(1,398)	(1,666)
Securities held to maturity, Greater than 12 Months, Fair Value	1,301	1,144
Securities held to maturity, Greater than 12 Months, Unrealized Losses	(23)	(181)
Securities held to maturity, Fair Value, Total	1,301	1,144
Securities held to maturity, Unrealized Losses, Total	(23)	(181)
Equity Securities [Member]
Schedule Of Securities [Line Items]
Securities available for sale, Less than 12 Months, Fair Value	729	100
Securities available for sale, Less than 12 Months, Unrealized Losses	(16)	(9)
Securities available for sale, Greater than 12 Months, Fair Value		659
Securities available for sale, Greater than 12 Months, Unrealized Losses		(14)
Securities available for sale, Fair Value, Total	729	759
Securities available for sale, Unrealized Losses, Total	$ (16)	$ (23)