Fair Value Disclosures - Assets Measured at Fair Value on a Non-recurring Basis (Details 3) (Fair Value, Measurements, Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets measured at fair value on a non-recurring basis
Impaired Loans	$ 43,298	$ 39,948
Mortgage servicing rights	3,276	2,739
Other real estate owned	3,922	6,600
Total	50,496	49,287
Level 1 [Member]
Assets measured at fair value on a non-recurring basis
Impaired Loans
Mortgage servicing rights
Other real estate owned
Total
Level 2 [Member]
Assets measured at fair value on a non-recurring basis
Mortgage servicing rights	3,276	2,739
Other real estate owned	3,922	6,600
Total	7,198	9,339
Level 3 [Member]
Assets measured at fair value on a non-recurring basis
Impaired Loans	43,298	39,948
Total	$ 43,298	$ 39,948