Fair Value Measurements (Details 2) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Impaired loans [Member]
Dec. 31, 2011
Impaired loans [Member]
Sep. 30, 2012
Other real estate owned [Member]
Dec. 31, 2011
Other real estate owned [Member]
Sep. 30, 2012
Mortgage servicing rights [Member]
Dec. 31, 2011
Mortgage servicing rights [Member]
Sep. 30, 2012
Level 3 [Member]
Impaired loans [Member]
Dec. 31, 2011
Level 3 [Member]
Impaired loans [Member]
Sep. 30, 2012
Level 3 [Member]
Impaired loans [Member]
Appraisal of Collateral [Member]
Sep. 30, 2012
Level 3 [Member]
Impaired loans [Member]
Appraisal of Collateral [Member]
Maximum [Member]
Sep. 30, 2012
Level 3 [Member]
Impaired loans [Member]
Appraisal of Collateral [Member]
Minimum [Member]
Sep. 30, 2012
Level 3 [Member]
Other real estate owned [Member]
Dec. 31, 2011
Level 3 [Member]
Other real estate owned [Member]
Sep. 30, 2012
Level 3 [Member]
Other real estate owned [Member]
Appraisal of Collateral [Member]
Sep. 30, 2012
Level 3 [Member]
Other real estate owned [Member]
Appraisal of Collateral [Member]
Maximum [Member]
Sep. 30, 2012
Level 3 [Member]
Other real estate owned [Member]
Appraisal of Collateral [Member]
Minimum [Member]
Sep. 30, 2012
Level 3 [Member]
Mortgage servicing rights [Member]
Dec. 31, 2011
Level 3 [Member]
Mortgage servicing rights [Member]
Sep. 30, 2012
Level 3 [Member]
Mortgage servicing rights [Member]
Discounted Cash Flow [Member]
Sep. 30, 2012
Level 3 [Member]
Mortgage servicing rights [Member]
Discounted Cash Flow [Member]
Maximum [Member]
Sep. 30, 2012
Level 3 [Member]
Mortgage servicing rights [Member]
Discounted Cash Flow [Member]
Minimum [Member]
Schedule of quantitative information of assets measured at fair value                                          
Fair value estimate $ 9,250 $ 6,741 $ 51 $ 10 $ 192 $ 167 $ 9,250 $ 6,741 $ 9,250     $ 51 $ 10 $ 51     $ 192 $ 167 $ 192    
Appraisal adjustments                   (50.00%) 0.00%                    
Liquidation expense                   (10.00%) 0.00%                    
Management discount for property type                             (32.00%) 0.00%          
Remaining term                   30 years 17 months                 30 years 8 months
Discount rate                   8.00% 3.75%               2.10%