Fair Values of Assets and Liabilities (Details 3) (Fair Value Measurements Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012
Reconciliation of Level 3 assets
Impaired loans	$ 31,101
Commercial loans held for sale
Residential mortgage loans held for sale	214
Other real estate	2,244
Repossessed assets	1,412
Total	34,971
Level 1 [Member]
Reconciliation of Level 3 assets
Impaired loans
Commercial loans held for sale
Residential mortgage loans held for sale
Other real estate
Repossessed assets
Total
Level 2 [Member]
Reconciliation of Level 3 assets
Impaired loans
Commercial loans held for sale
Residential mortgage loans held for sale
Other real estate
Repossessed assets
Total
Level 3 [Member]
Reconciliation of Level 3 assets
Impaired loans	31,101
Commercial loans held for sale
Residential mortgage loans held for sale	214
Other real estate	2,244
Repossessed assets	1,412
Total	34,971
Initial Carrying Value [Member]
Reconciliation of Level 3 assets
Impaired loans	78,200
Commercial loans held for sale	36
Residential mortgage loans held for sale	708
Other real estate	3,764
Repossessed assets	2,566
Total	$ 85,274