Impairment of Investment Securities (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	$ 35,670	$ 61,767
Gross Unrealized Losses Less Than 12 Months	(168)	(701)
Estimated Fair Value, 12 Months or More	21,452	22,943
Gross Unrealized Losses 12 Months or More	(31,250)	(31,785)
Total Estimated Fair Value	57,122	84,710
Total Gross Unrealized Losses	(31,418)	(32,486)
Mortgage Backed Securities - Residential [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Total Gross Unrealized Losses	0
Mortgage Backed Securities - Residential [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	24,232	25
Gross Unrealized Losses Less Than 12 Months	(96)
Estimated Fair Value, 12 Months or More	0
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	24,232	25
Total Gross Unrealized Losses	(96)
Mortgage Backed Securities - Residential [Member] | Obligations of U.S. Government Agencies [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	0	1,086
Gross Unrealized Losses Less Than 12 Months	0	(6)
Estimated Fair Value, 12 Months or More	15	16
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	15	1,102
Total Gross Unrealized Losses	0	(6)
Mortgage Backed Securities - Commercial [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months		151
Gross Unrealized Losses Less Than 12 Months		(1)
Total Estimated Fair Value		151
Total Gross Unrealized Losses		(1)
Other Government Sponsored Enterprises [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	2,999	55,969
Gross Unrealized Losses Less Than 12 Months	(1)	132
Estimated Fair Value, 12 Months or More	0
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	2,999	55,969
Total Gross Unrealized Losses	(1)	(132)
Obligations of States and Political Subdivisions [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	360
Gross Unrealized Losses Less Than 12 Months	0
Estimated Fair Value, 12 Months or More	0
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	360
Total Gross Unrealized Losses	0
Corporate Securities [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	8,079	4,536
Gross Unrealized Losses Less Than 12 Months	(71)	562
Estimated Fair Value, 12 Months or More	0
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	8,079	4,536
Total Gross Unrealized Losses	(71)	(562)
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, 12 Months or More	21,437	22,927
Pooled Trust Preferred Collateralized Debt Obligations [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	0
Gross Unrealized Losses Less Than 12 Months	0
Gross Unrealized Losses 12 Months or More	(31,250)	(31,785)
Total Estimated Fair Value	21,437	22,927
Total Gross Unrealized Losses	(31,250)	(31,785)
Equities [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	0
Gross Unrealized Losses Less Than 12 Months	0
Estimated Fair Value, 12 Months or More	0
Gross Unrealized Losses 12 Months or More	0
Total Estimated Fair Value	0
Total Gross Unrealized Losses	0
Debt Securities [Member]
Schedule of Unrealized Losses and Estimated Fair Values
Estimated Fair Value, Less Than 12 Months	35,670
Gross Unrealized Losses Less Than 12 Months	(168)
Estimated Fair Value, 12 Months or More	21,452
Gross Unrealized Losses 12 Months or More	(31,250)
Total Estimated Fair Value	57,122
Total Gross Unrealized Losses	$ (31,418)