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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, 2017
Dec. 31, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 610,368 $ 605,394   $ 610,368   $ 605,394
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward]            
Total losses (258)   $ (238) $ (301) $ (660)  
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 104,691 69,292   $ 104,691   69,292
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 505,677 536,102   505,677   536,102
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 3,304 3,433   3,304   3,433
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 236,058 222,464   236,058   222,464
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 131,942 133,516   131,942   133,516
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 217,872 225,056   217,872   225,056
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 24,496 24,358   24,496   24,358
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 80,195 44,934   80,195   44,934
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 24,496 24,358   24,496   24,358
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 155,863 177,530   155,863   177,530
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 131,942 133,516   131,942   133,516
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 217,872 225,056   217,872   225,056
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 3,304 3,433   3,304   3,433
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]            
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward]            
Beginning balance 3,474   2,908 3,433 3,236 3,236
Total recognized losses Included in net income (163)   (160) (78) (540)  
Issues 88   127 171 221  
Settlements (95)   (78) (222) (120)  
Ending balance 3,304 3,433 2,797 3,304 2,797 3,433
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 (163)   (160) (78) (540)  
Nonrecurring [Member]            
Impaired loan (collateral dependent) [Abstract]            
Impaired loans, fair value adjustments 400 300 300 500 600 600
Other real estate owned [Abstract]            
Other real estate /assets owned, fair value adjustment 1,400 600 $ 100 2,000 $ 200 1,200
Nonrecurring [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 2,352 5,506   2,352   5,506
Other real estate /assets owned 17,166 4,388   17,166   4,388
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) 2,352 5,506   2,352   5,506
Other real estate /assets owned $ 17,166 $ 4,388   $ 17,166   $ 4,388