Securities (Summary of Gross Unrealized Losses and Fair Value of the Investments with Unrealized Losses) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Less than 12 Months Fair Value	$ 53,972	$ 163,559
Less than 12 Months Unrealized Losses	(719)	(3,130)
12 Months or More Fair Value	4,145	4,348
12 Months or More Unrealized Losses	(254)	(318)
Total Fair Value	58,117	167,907
Total Unrealized Losses	(973)	(3,448)
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Less than 12 Months Fair Value	26,028	86,529
Less than 12 Months Unrealized Losses	(83)	(1,025)
12 Months or More Fair Value	347	588
12 Months or More Unrealized Losses	(1)	(2)
Total Fair Value	26,375	87,117
Total Unrealized Losses	(84)	(1,027)
State and Municipal Securities [Member]
Less than 12 Months Fair Value	27,944	74,755
Less than 12 Months Unrealized Losses	(636)	(2,099)
12 Months or More Fair Value	2,829	2,792
12 Months or More Unrealized Losses	(222)	(284)
Total Fair Value	30,773	77,547
Total Unrealized Losses	(858)	(2,383)
Other Securities [Member]
Less than 12 Months Fair Value	0	2,275
Less than 12 Months Unrealized Losses	0	(6)
12 Months or More Fair Value	969	968
12 Months or More Unrealized Losses	(31)	(32)
Total Fair Value	969	3,243
Total Unrealized Losses	$ (31)	$ (38)