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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 579,115 $ 594,936   $ 579,115   $ 594,936
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Total gains (losses) (238)   $ 225 $ (660) $ (30)  
Minimum [Member]            
Other real estate owned [Abstract]            
Typical frequency of periodic reviews       12 months    
Maximum [Member]            
Other real estate owned [Abstract]            
Typical frequency of periodic reviews       18 months    
Frequency of periodic reviews in general       24 months    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 70,282 69,453   $ 70,282   69,453
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 508,833 525,483   508,833   525,483
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0 0   0   0
Recurring [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage servicing rights 2,797 3,236   2,797   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 220,861 239,394   220,861   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 122,947 129,215   122,947   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 210,048 201,576   210,048   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 25,259 24,751   25,259   24,751
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage servicing rights 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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 45,023 44,702   45,023   44,702
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [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 25,259 24,751   25,259   24,751
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage servicing rights 0 0   0   0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [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 175,838 194,692   175,838   194,692
Recurring [Member] | Significant Other Observable Inputs (Level 2) [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 122,947 129,215   122,947   129,215
Recurring [Member] | Significant Other Observable Inputs (Level 2) [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 210,048 201,576   210,048   201,576
Recurring [Member] | Significant Other Observable Inputs (Level 2) [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 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Mortgage servicing rights 2,797 3,236   2,797   3,236
Recurring [Member] | Significant Unobservable Inputs (Level 3) [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 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [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 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [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 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [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 0 0   0   0
Recurring [Member] | Mortgage Servicing Rights [Member]            
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]            
Beginning balance 2,908   2,797 3,236 2,968 2,968
Total recognized gains (losses) included in net income (160)   446 (540) 285  
Issues 127   213 221 297  
Settlements (78)   (221) (120) (315)  
Ending balance 2,797 3,236 3,235 2,797 3,235 3,236
Total gains (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 (160)   446 (540) 285  
Nonrecurring [Member]            
Impaired loan (collateral dependent) [Abstract]            
Impaired loans, fair value adjustments 300 1,000 (20) 600 500 1,800
Other real estate owned [Abstract]            
Other real estate /assets owned, fair value adjustment 100 500 $ 300 200 $ 400 1,700
Nonrecurring [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 3,973 3,192   3,973   3,192
Other real estate /assets owned 1,335 6,798   1,335   6,798
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 0 0   0   0
Other real estate /assets owned 0 0   0   0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 0 0   0   0
Other real estate /assets owned 0 0   0   0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 3,973 3,192   3,973   3,192
Other real estate /assets owned $ 1,335 $ 6,798   $ 1,335   $ 6,798