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Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non-recurring) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Dec. 31, 2012
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Municipal Bonds [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Equity Securities [Member]
Dec. 31, 2012
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights Discount Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights Discount Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights Prepayment Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Mortgage Servicing Rights Prepayment Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Impaired Loans [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Mortgage Servicing Rights [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Mortgage Servicing Rights Prepayment Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Minimum [Member]
Other Real Estate Owned [Member]
Dec. 31, 2012
Minimum [Member]
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Equity Securities [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Equity Securities [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Mortgage Servicing Rights [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Mortgage Servicing Rights [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Mortgage Servicing Rights Prepayment Rate Input [Member]
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Maximum [Member]
Other Real Estate Owned [Member]
Dec. 31, 2012
Maximum [Member]
Other Real Estate Owned [Member]
Fair Value, Measurements, Nonrecurring [Member]
Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]                                                                      
Fair Value on a Recurring Basis         $ 30,770     $ 22,169       $ 6,750                                              
Valuation Methodology             Bond pricing       Discounted cash flows     Discounted cash flows           Appraisal value Appraisal value                            
Significant Unobservable Input             Equivalent rating       Discount rate         Discount rate   Constant prepayment rate (CPR)   Property specific impairment adjustment                              
Other real estate owned 62,900 86,500 62,891 62,891                                                              
Range of Inputs           BBB-AAA       1.85%-2.43%         10%-13.5%   19%-24%   0%-49%                                
Weighted Average of Inputs                   2.09%         10.21%   20.72%   6.58%                                
Impact to Valuation from an Increased or HIgher Input Value             Increase       Decrease         Decrease   Decrease   Decrease                              
Impaired loans     $ 98,426 $ 98,426                                                              
Range of Inputs - Discount Rate                 2.09%       10.21%                 1.85% 1.85% 10.00% 10.00%   0.00%   2.43% 2.43% 13.50% 13.50%   49.00%  
Range of Inputs - Prepayment Rate                         20.72%                     19.00%   19.00%         24.00%   24.00%    
Range of Inputs - Other Adjustments                                                       0.00%             49.00%