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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, 2018
Dec. 31, 2017
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities $ 585,764 $ 561,403   $ 585,764   $ 561,403
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 357 2,709   357   2,709
Reconciliation of beginning and ending balances of recurring fair value measurements recognized in balance sheet using significant unobservable (Level 3) inputs [Roll Forward]            
Total gains (losses) (45)   $ (258) $ 77 $ (301)  
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    
U.S. Treasury and Government Agencies [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 246,773 210,572   $ 246,773   210,572
State and Political Subdivisions [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 127,489 145,015   127,489   145,015
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 211,000 205,309   211,000   205,309
Other Debt Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 502 507   502   507
Recurring [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Mortgage servicing rights 3,772 3,484   3,772   3,484
Recurring [Member] | U.S. Treasury and Government Agencies [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 246,773 210,572   246,773   210,572
Recurring [Member] | State and Political Subdivisions [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 127,489 145,015   127,489   145,015
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 211,000 205,309   211,000   205,309
Recurring [Member] | Other Debt Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 502 507   502   507
Recurring [Member] | CRA Investments Funds [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available for sale securities, equity securities   24,358       24,358
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Mortgage servicing rights 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and Government Agencies [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 89,360 64,598   89,360   64,598
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and Political Subdivisions [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Debt Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | CRA Investments Funds [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available for sale securities, equity securities   24,358       24,358
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Mortgage servicing rights 0 0   0   0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and Government Agencies [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 157,413 145,974   157,413   145,974
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 127,489 145,015   127,489   145,015
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 211,000 205,309   211,000   205,309
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 502 507   502   507
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | CRA Investments Funds [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available for sale securities, equity securities   0       0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Mortgage servicing rights 3,772 3,484   3,772   3,484
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Government Agencies [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available-for-sale securities, debt securities 0 0   0   0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | CRA Investments Funds [Member]            
Assets Measured at Fair Value on Recurring Basis [Abstract]            
Available for sale securities, equity securities   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 3,706   3,474 3,484 3,433 3,433
Total recognized gains (losses) Included in net income 68   (163) 296 (78)  
Issues 111   88 211 171  
Settlements (113)   (95) (219) (222)  
Ending balance 3,772 3,484 3,304 3,772 3,304 3,484
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 68   (163) 296 (78)  
Nonrecurring [Member]            
Impaired loan (collateral dependent) [Abstract]            
Impaired loans, fair value adjustments 200 300 400 200 500 1,000
Other real estate owned [Abstract]            
Other real estate owned, fair value adjustment 800 200 $ 1,400 1,200 $ 1,900 2,500
Nonrecurring [Member] | Fair Value [Member]            
Assets measured-nonrecurring basis [Abstract]            
Impaired loans (collateral dependent) 357 2,709   357   2,709
Other real estate owned 4,499 18,951   4,499   18,951
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 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 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) 357 2,709   357   2,709
Other real estate owned $ 4,499 $ 18,951   $ 4,499   $ 18,951