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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 616,303,000   $ 616,303,000   $ 578,579,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   $ 1,638,000      
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)   825,000      
Purchases, issuances, sales and settlements [Abstract]          
Purchases   0      
Issuances   0      
Sales   0      
Settlements   (39,000)      
Ending Balance   2,424,000   $ 2,424,000  
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 20,455,000   20,455,000   14,747,000
Fair value of loans with a specific allowance 18,728,000   18,728,000   13,345,000
Specific Allowance 542,000   542,000   623,000
Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 616,303,000   616,303,000   578,579,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 341,000   341,000   172,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 615,962,000   615,962,000   575,859,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   2,548,000
Fair Value, Measurements, Nonrecurring [Member]          
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 25,578,000   25,578,000    
Fair value of loans with a specific allowance 20,756,000   20,756,000    
Specific Allowance 4,822,000   4,822,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Total available-for-sale securities 123,038,000   123,038,000   113,770,000
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 123,038,000   123,038,000   113,770,000
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 123,038,000   123,038,000   113,770,000
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 175,240,000   175,240,000   166,266,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 175,240,000   175,240,000   166,266,000
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 175,240,000   175,240,000   166,266,000
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 0   0   0
Residential Mortgage-backed Securities [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 315,671,000   315,671,000   293,811,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 315,671,000   315,671,000   293,811,000
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 315,671,000   315,671,000   293,811,000
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          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   2,548,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 2,522,000   2,548,000 1,652,000  
Transfers into Level 3 0   0 0  
Transfers out of Level 3 0   0 0  
Total gains or losses [Abstract]          
Included in net income 0   0 0  
Included in other comprehensive income (loss) 0   18,000 848,000  
Purchases, issuances, sales and settlements [Abstract]          
Purchases 0   0 0  
Issuances 0   0 0  
Sales (2,522,000)   (2,522,000) 0  
Settlements   (44,000) (76,000)  
Ending Balance 0 2,424,000 0 2,424,000  
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 0 $ 0  
Trust preferred securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   2,548,000
Trust preferred 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 0   0   0
Trust preferred securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   0
Trust preferred securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 0   0   2,548,000
Other securities          
Available-for-sale: [Abstract]          
Total available-for-sale securities 2,354,000   2,354,000   2,184,000
Other securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 2,354,000   2,354,000   2,184,000
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 341,000   341,000   172,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 2,013,000   2,013,000   2,012,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 0   $ 0   $ 0