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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 757,690,000   $ 757,690,000   $ 692,274,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Transfers into Level 3   $ 0      
Transfers out of Level 3   0      
Total gains or losses [Abstract]          
Included in net income   0      
Included in other comprehensive income (loss)   0      
Purchases, issuances, sales and settlements [Abstract]          
Purchases   0      
Issuances   0      
Sales   0      
Settlements   0      
Ending Balance   0   $ 0  
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 25,058,000   25,058,000   34,178,000
Fair value of loans with a specific allowance 23,698,000   23,698,000   32,603,000
Specific Allowance 2,277,000   2,277,000   3,279,000
Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 757,690,000   757,690,000   692,274,000
Interest Rate Fair Value Hedge Liability at Fair Value 293,000   293,000    
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 190,000   190,000   364,000
Interest Rate Fair Value Hedge Liability at Fair Value 0   0    
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 756,530,000   756,530,000   690,943,000
Interest Rate Fair Value Hedge Liability at Fair Value 293,000   293,000    
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 970,000   970,000   967,000
Interest Rate Fair Value Hedge Liability at Fair Value 0   0    
Fair Value, Measurements, Nonrecurring [Member]          
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 12,305,000   12,305,000    
Fair value of loans with a specific allowance 10,028,000   10,028,000    
Specific Allowance 2,277,000   2,277,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Total available-for-sale securities 193,424,000   193,424,000   198,649,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 193,424,000   193,424,000   198,649,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 193,424,000   193,424,000   198,649,000
U.S. Treasury securities and obligations of U.S. government corporations & agencies | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Obligations of states and political subdivisions          
Available-for-sale: [Abstract]          
Total available-for-sale securities 186,229,000   186,229,000   192,579,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 968,000 0 967,000 0  
Transfers into Level 3 0   0 0  
Transfers out of Level 3 0   0 0  
Total gains or losses [Abstract]          
Included in net income (2,000)   3,000 0  
Included in other comprehensive income (loss) 0   0 0  
Purchases, issuances, sales and settlements [Abstract]          
Purchases 0   0 0  
Issuances 0   0 0  
Sales 0   0 0  
Settlements 0   0 0  
Ending Balance 970,000 0 970,000 0  
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 0 0  
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 186,229,000   186,229,000   192,579,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 185,259,000   185,259,000   191,612,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 970,000   970,000   967,000
Residential Mortgage-backed Securities [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 374,646,000   374,646,000   298,672,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 374,646,000   374,646,000   298,672,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 374,646,000   374,646,000   298,672,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Trust preferred securities          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 0 2,522,000 0 2,548,000  
Transfers into Level 3 0 0 0 0  
Transfers out of Level 3 0 0 0 0  
Total gains or losses [Abstract]          
Included in net income 0 0 0 0  
Included in other comprehensive income (loss) 0 0 0 18,000  
Purchases, issuances, sales and settlements [Abstract]          
Purchases 0 0 0 0  
Issuances 0 0 0 0  
Sales 0 (2,522,000) 0 (2,522,000)  
Settlements 0 0 0 (44,000)  
Ending Balance 0 0 0 0  
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 0 $ 0  
Other securities          
Available-for-sale: [Abstract]          
Total available-for-sale securities 3,391,000   3,391,000   2,374,000
Other securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 3,391,000   3,391,000   2,374,000
Other securities | Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 190,000   190,000   364,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 3,201,000   3,201,000   2,010,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Measurements, Nonrecurring [Member]          
Debt Securities, Available-for-sale [Line Items]          
Assets, Fair Value Disclosure 10,028,000   10,028,000   16,437,000
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Debt Securities, Available-for-sale [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2)          
Debt Securities, Available-for-sale [Line Items]          
Assets, Fair Value Disclosure 0   0   0
Impaired Loans (Collateral Dependent) [Member] | Fair Value, Measurements, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3)          
Debt Securities, Available-for-sale [Line Items]          
Assets, Fair Value Disclosure $ 10,028,000   $ 10,028,000   $ 16,437,000