Investment Securities (Details 6) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position on other securities	$ (667,000)	$ (3,663,000)
Investment Securities (Textuals) [Abstract]
Federal Home Loan Bank Stock	96,000,000	121,000,000
Federal Reserve Bank Stock	70,000,000	70,000,000
Change in Federal Home Loan Bank Stock	(25,000,000)
Obligations of state and political subdivisions (municipal securities) [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position on other securities	(105,000)	(28,000)
Residential mortgage-related securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position on other securities	(485,000)	(1,463,000)
Asset-backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position on other securities	$ 0	$ (707,000)