Fair Value Measurements Rollforward of Level 3 Assets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member]		Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member]		Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]		Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 1 [Member]		Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]		Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 2 [Member]		Sep. 30, 2012 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]		Sep. 30, 2011 Fair Value, Measurements, Nonrecurring [Member] Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Loans Receivable, Fair Value Disclosure			$ 20,230	[1]	$ 18,297	[2]	$ 0	[1]	$ 0	[2]	$ 0	[1]	$ 0	[2]	$ 20,230	[1]	$ 18,297	[2]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 0	$ 0

[1] (1)Collateral-dependent impaired loans held at September 30, 2012 that had write-downs in fair value or whose specific reserve changed during the first nine months of 2012.

[2] (1)Collateral-dependent impaired loans held at September 30, 2011 that had write-downs in fair value or whose specific reserve changed during the first nine months of 2011.