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Fair Value of Assets and Liabilities (Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Nonrecurring) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value   $ 8,435  
Impaired loans [1] $ 101,255 127,412  
Fair Value, Measurements, Nonrecurring      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Impaired loans 65,626    
Other real estate owned 65,328    
Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Impaired loans 65,626    
Other real estate owned 65,328    
Municipal      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 68,613 58,953 $ 36,386
Municipal | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Bond pricing    
Significant Unobservable Input Equivalent rating    
Range of Inputs BBB-AA+    
Impact to Valuation from an Increased or HIgher Input Value Increase    
Equity securities      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 25,199 23,711 22,163
Equity securities | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Discounted cash flows    
Significant Unobservable Input Discount rate    
Range of Inputs 1.85%-2.12%    
Weighted Average of Inputs 2.01%    
Impact to Valuation from an Increased or HIgher Input Value Decrease    
Other Real Estate Owned      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value inputs, discount for lack of marketability 10.00%    
Other Real Estate Owned | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Significant Unobservable Input Appraisal adjustment - cost of sale    
Range of Inputs 0.1    
Weighted Average of Inputs 10.00%    
Impact to Valuation from an Increased or HIgher Input Value Decrease    
Impaired Loans | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Appraisal value    
Significant Unobservable Input Appraisal adjustment - cost of sale    
Range of Inputs 0.1    
Weighted Average of Inputs 10.00%    
Impact to Valuation from an Increased or HIgher Input Value Decrease    
Minimum | Equity securities | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Range of Inputs - Discount Rate 1.85%    
Minimum | Other Real Estate Owned | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value inputs, discount for lack of marketability 10.00%    
Minimum | Impaired Loans | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value inputs, discount for lack of marketability 10.00%    
Maximum | Equity securities | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Range of Inputs - Discount Rate 2.12%    
Maximum | Other Real Estate Owned | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value inputs, discount for lack of marketability 10.00%    
Maximum | Impaired Loans | Fair Value, Measurements, Nonrecurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair value inputs, discount for lack of marketability 10.00%    
Mortgage Servicing Rights Prepayment Rate Input | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Constant prepayment rate (CPR)    
Range of Inputs 8%-26%    
Weighted Average of Inputs 11.77%    
Impact to Valuation from an Increased or HIgher Input Value Decrease    
Mortgage Servicing Rights Discount Rate Input | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Significant Unobservable Input Discount rate    
Range of Inputs 9%-13%    
Weighted Average of Inputs 9.13%    
Impact to Valuation from an Increased or HIgher Input Value Decrease    
Mortgage Servicing Rights      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 9,092 $ 8,435 $ 8,946
Mortgage Servicing Rights | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Valuation Methodology Discounted cash flows    
Mortgage Servicing Rights | Minimum | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Range of Inputs - Discount Rate 9.00%    
Range of Inputs - Prepayment Rate 8.00%    
Mortgage Servicing Rights | Maximum | Fair Value, Measurements, Recurring | Level 3      
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]      
Range of Inputs - Discount Rate 13.00%    
Range of Inputs - Prepayment Rate 26.00%    
[1] Impaired loans are considered by the Company to be non-accrual loans, TDRs or loans with principal and/or interest at risk, even if the loan is current with all payments of principal and interest.