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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Available-for-sale: [Abstract]      
Total available-for-sale securities $ 617,801,000   $ 686,048,000
Impaired Loans Receivable [Abstract]      
Carrying amount of loans with a specific allowance 23,662,000   25,861,000
Fair value of loans with a specific allowance 20,389,000   23,440,000
Specific Allowance 1,831,000   1,098,000
Fair Value, Recurring [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 617,801,000   686,048,000
Interest Rate Derivative Assets at Fair Value 1,002,000    
Interest Rate Derivative Liabilities, at Fair Value 2,710,000   325,000
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 146,000   219,000
Interest Rate Derivative Assets at Fair Value 0    
Interest Rate Derivative Liabilities, at Fair Value 0   0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 616,865,000   684,856,000
Interest Rate Derivative Assets at Fair Value 1,002,000    
Interest Rate Derivative Liabilities, at Fair Value 2,710,000   325,000
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 790,000   973,000
Interest Rate Derivative Assets at Fair Value 0    
Interest Rate Derivative Liabilities, at Fair Value 0   0
Fair Value, Nonrecurring [Member]      
Impaired Loans Receivable [Abstract]      
Carrying amount of loans with a specific allowance 11,124,000    
Fair value of loans with a specific allowance 9,514,000    
Specific Allowance 1,610,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies      
Available-for-sale: [Abstract]      
Total available-for-sale securities 56,689,000   107,320,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Recurring [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 56,689,000   107,320,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 56,689,000   107,320,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
Obligations of states and political subdivisions      
Available-for-sale: [Abstract]      
Total available-for-sale securities 163,502,000   178,433,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning balance 973,000 $ 967,000  
Transfers into Level 3 0 0  
Transfers out of Level 3 0 0  
Total gains or losses [Abstract]      
Included in net income 1,000 (1,000)  
Included in other comprehensive income (loss) 0 0  
Purchases, issuances, sales and settlements [Abstract]      
Purchases 0 0  
Issuances 0 0  
Sales (184,000) 0  
Settlements 0 0  
Ending Balance 790,000 968,000  
Total gains or losses for the period included in net income attributable to the change in unrealized gains or losses related to assets and liabilities still held at the reporting date 0 $ 0  
Obligations of states and political subdivisions | Fair Value, Recurring [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 163,502,000   178,433,000
Obligations of states and political subdivisions | Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
Obligations of states and political subdivisions | Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 162,712,000   177,460,000
Obligations of states and political subdivisions | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 790,000   973,000
Residential Mortgage-backed Securities [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 395,511,000   396,126,000
Residential Mortgage-backed Securities [Member] | Fair Value, Recurring [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 395,511,000   396,126,000
Residential Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
Residential Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 395,511,000   396,126,000
Residential Mortgage-backed Securities [Member] | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
Other securities      
Available-for-sale: [Abstract]      
Total available-for-sale securities 2,099,000   4,169,000
Other securities | Fair Value, Recurring [Member]      
Available-for-sale: [Abstract]      
Total available-for-sale securities 2,099,000   4,169,000
Other securities | Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 146,000   219,000
Other securities | Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 1,953,000   3,950,000
Other securities | Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Total available-for-sale securities 0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Nonrecurring [Member]      
Available-for-sale: [Abstract]      
Assets, Fair Value Disclosure 9,514,000   12,727,000
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Available-for-sale: [Abstract]      
Assets, Fair Value Disclosure 0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2)      
Available-for-sale: [Abstract]      
Assets, Fair Value Disclosure 0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3)      
Available-for-sale: [Abstract]      
Assets, Fair Value Disclosure $ 9,514,000   $ 12,727,000