Fair Value of Financial Assets and Liabilities, Transfers between Levels (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Description	Quoted prices in exact security not available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description	Quoted prices in exact security not available on the measurement date
Marketable equity securities [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Description	Quoted prices available on the measurement date
Fair Value, Assets, Level 2 to Level 1 Transfers, Description	Quoted prices available on the measurement date
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	323
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Marketable equity securities [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	323
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	323
Significant Other Observable Inputs (Level 2) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	464
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0
Significant Other Observable Inputs (Level 2) [Member] | Marketable equity securities [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	323
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0
Significant Unobservable Inputs (Level 3) [Member] | Marketable equity securities [Member]
Fair Value, Transfers Between Level 1 and Level 2, Description and Policy [Abstract]
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount	0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount	0