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Disclosures About Fair Value of Assets and Liabilities (Details 4) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Other assets are measured at fair value on a nonrecurring basis
Impaired loans	$ 10,462	$ 5,822
Mortgage servicing rights	4,602	4,193
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Other assets are measured at fair value on a nonrecurring basis
Impaired loans
Mortgage servicing rights
Significant Other Observable Inputs (Level 2) [Member]
Other assets are measured at fair value on a nonrecurring basis
Impaired loans
Mortgage servicing rights
Significant Unobservable Inputs (Level 3) [Member]
Other assets are measured at fair value on a nonrecurring basis
Impaired loans	10,462	5,822
Mortgage servicing rights	$ 4,602	$ 4,193