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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities $ 555,853 $ 570,185  
Other real estate owned [Abstract]      
Typical frequency of periodic reviews, minimum 12 months    
Typical frequency of periodic reviews, maximum 18 months    
Maximum frequency of periodic reviews in general 24 months    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Total recognized losses Included in net income $ (422)   $ (255)
Total losses (422)   (255)
U.S. Treasury and Government Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 235,679 239,394  
State and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 125,802 129,215  
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 194,372 201,576  
Recurring [Member] | Fair Value [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 2,908 3,236  
Recurring [Member] | Fair Value [Member] | U.S. Treasury and Government Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 235,679 239,394  
Recurring [Member] | Fair Value [Member] | State and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 125,802 129,215  
Recurring [Member] | Fair Value [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 194,372 201,576  
Recurring [Member] | Fair Value [Member] | CRA Investments Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 25,097 24,751  
Recurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 0 0  
Recurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and Government Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 44,932 44,702  
Recurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | CRA Investments Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 25,097 24,751  
Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 0 0  
Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Government Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 190,747 194,692  
Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 125,802 129,215  
Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 194,372 201,576  
Recurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member] | CRA Investments Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mortgage servicing rights 2,908 3,236  
Recurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Government Agencies [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | CRA Investments Funds [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Available-for-sale securities 0 0  
Recurring [Member] | Mortgage Servicing Rights [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 3,236   2,968
Total recognized losses Included in net income (380)   (161)
Issues 94   84
Settlements (42)   (94)
Ending balance 2,908 3,236 2,797
Total losses for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date (380)   (161)
Total losses (380)   (161)
Nonrecurring [Member]      
Impaired loan (collateral dependent) [Abstract]      
Impaired loans, fair value adjustments 200 1,000 500
Other real estate owned [Abstract]      
Other real estate /assets owned, fair value adjustment 100 500 $ 100
Nonrecurring [Member] | Fair Value [Member]      
Assets measured-nonrecurring basis [Abstract]      
Impaired loans (collateral dependent) 4,516 3,192  
Other real estate /assets owned 374 6,798  
Nonrecurring [Member] | Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Assets measured-nonrecurring basis [Abstract]      
Impaired loans (collateral dependent) 0 0  
Other real estate /assets owned 0 0  
Nonrecurring [Member] | Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Assets measured-nonrecurring basis [Abstract]      
Impaired loans (collateral dependent) 0 0  
Other real estate /assets owned 0 0  
Nonrecurring [Member] | Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Assets measured-nonrecurring basis [Abstract]      
Impaired loans (collateral dependent) 4,516 3,192  
Other real estate /assets owned $ 374 $ 6,798