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Fair Value Measurement (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Jun. 30, 2012
Level 3 [Member]
Dec. 31, 2011
Level 3 [Member]
Jun. 30, 2012
Impaired Loans [Member]
Maximum [Member]
Level 3 [Member]
Jun. 30, 2012
Impaired Loans [Member]
Minimum [Member]
Level 3 [Member]
Jun. 30, 2012
Impaired Loans [Member]
Weighted Average [Member]
Level 3 [Member]
Jun. 30, 2012
Other Real Estate Owned [Member]
Jun. 30, 2012
Other Real Estate Owned [Member]
Level 3 [Member]
Jun. 30, 2012
Other Real Estate Owned [Member]
Weighted Average [Member]
Level 3 [Member]
Jun. 30, 2012
Mortgage Servicing Rights [Member]
Jun. 30, 2012
Appraisal Valuation Technique [Member]
Impaired Loans [Member]
Level 3 [Member]
Jun. 30, 2012
Appraisal Valuation Technique [Member]
Other Real Estate Owned [Member]
Level 3 [Member]
Jun. 30, 2012
Cost Approach Valuation Technique [Member]
Impaired Loans [Member]
Level 3 [Member]
Jun. 30, 2012
Cost Approach Valuation Technique [Member]
Other Real Estate Owned [Member]
Level 3 [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]                                
Impaired loans $ 10,390 [1] $ 13,705 [1]   $ 10,390 [1],[2] $ 13,705 [1]                      
Other real estate owned 3,290 [1] 3,224 [1]   3,290 [1] 3,224 [1]                      
Mortgage servicing rights, Fair Value $ 312 $ 368 $ 475 $ 312 $ 368                      
Valuation Technique                   Appraisal   Discounted Cash Flow (3) [3] Appraisal [2]      
Unobservable Input                         Appraisal Adjustments (2) [2],[4] Appraisal Adjustments (2) [4] Cost to sell Cost to sell
Fair Value Inputs, Discount Rate           70.00% 0.00% 22.00%                
Cost to sell           25.00% 5.00% 8.00% 8.00%   8.00%          
[1] (1) Includes assets directly charged-down to fair value during the year-to-date period
[2] (1) Includes loans directly charged-down to fair value during the year-to-date period.
[3] (3) Valuation and inputs are determined by a third-party pricing service without adjustment.
[4] (2) Qualitative adjustments are discounts specific to each asset and are made as needed.