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Fair Market Value of Financial Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale $ 633,479 $ 599,844  
Equity securities at fair value 1,721 1,953  
Assets measured-nonrecurring basis [Abstract]      
Collateral dependent loans 2,870    
Impaired loans   3,217  
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) $ (1,159)   $ 22
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]      
Debt securities available-for-sale $ 159,871 171,150  
State and Political Subdivisions [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 99,196 102,307  
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 321,043 295,245  
Other Debt Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 53,369 31,142  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 70,050 54,263  
Equity securities at fair value 0 0  
Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 563,429 545,581  
Equity securities at fair value 0 0  
Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 0 0  
Equity securities at fair value 1,721 1,953  
Recurring [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Equity securities at fair value 1,721 1,953  
Mortgage servicing rights 2,481 3,263  
Recurring [Member] | U.S. Treasury and Government Agencies [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 159,871 171,150  
Recurring [Member] | State and Political Subdivisions [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 99,196 102,307  
Recurring [Member] | U.S. Government Sponsored Agency Mortgage-backed Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 321,043 295,245  
Recurring [Member] | Other Debt Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 53,369 31,142  
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Equity securities at fair value 0 0  
Mortgage servicing rights 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]      
Debt securities available-for-sale 70,050 54,263  
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]      
Debt securities available-for-sale 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]      
Debt securities available-for-sale 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]      
Debt securities available-for-sale 0 0  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Equity securities at fair value 0 0  
Mortgage servicing rights 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]      
Debt securities available-for-sale 89,821 116,887  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and Political Subdivisions [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 99,196 102,307  
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]      
Debt securities available-for-sale 321,043 295,245  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Other Debt Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 53,369 31,142  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Equity securities at fair value 1,721 1,953  
Mortgage servicing rights 2,481 3,263  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and Government Agencies [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 0 0  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and Political Subdivisions [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 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]      
Debt securities available-for-sale 0 0  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Other Debt Securities [Member]      
Assets Measured at Fair Value on Recurring Basis [Abstract]      
Debt securities available-for-sale 0 0  
Recurring [Member] | Equity Securities [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 1,953   1,173
Total unrealized gains (losses) included in net income (232)   355
Issues 0   0
Settlements 0   0
Ending balance 1,721 1,953 1,528
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 (232)   355
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 3,263   3,607
Total unrealized gains (losses) included in net income (818)   (234)
Issues 145   116
Settlements (109)   (99)
Ending balance 2,481 3,263 3,390
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 (818)   (234)
Nonrecurring [Member]      
Impaired loan (collateral dependent) [Abstract]      
Fair value adjustments on collateral dependent loans 800 400 400
Other real estate owned [Abstract]      
Other real estate owned, fair value adjustment 400 400 $ 700
Nonrecurring [Member] | Fair Value [Member]      
Assets measured-nonrecurring basis [Abstract]      
Collateral dependent loans 2,870    
Impaired loans   3,217  
Other real estate owned 1,162 12,593  
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Fair Value [Member]      
Assets measured-nonrecurring basis [Abstract]      
Collateral dependent loans 0    
Impaired loans   0  
Other real estate owned 0 0  
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Fair Value [Member]      
Assets measured-nonrecurring basis [Abstract]      
Collateral dependent loans 0    
Impaired loans   0  
Other real estate owned 0 0  
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fair Value [Member]      
Assets measured-nonrecurring basis [Abstract]      
Collateral dependent loans 2,870    
Impaired loans   3,217  
Other real estate owned $ 1,162 $ 12,593