Fair Value (Details 4) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Commercial mortgages [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	$ 8,327	$ 7,219
Commercial mortgages [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial mortgages [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial mortgages [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	8,327	7,219
Commercial, industrial, and agricultural [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	3,945	3,190
Commercial, industrial, and agricultural [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial, industrial, and agricultural [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Commercial, industrial, and agricultural [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	3,945	3,190
Residential real estate [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	419	105
Residential real estate [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Residential real estate [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	0	0
Residential real estate [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets and liabilities measured at fair value on a non-recurring basis
Fair value assets and liabilities measured on a nonrecurring basis	$ 419	$ 105