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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 682,140,000   $ 682,140,000   $ 619,848,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   $ 1,698,000   $ 1,906,000  
Transfers into Level 3   0   0  
Transfers out of Level 3   0   0  
Total gains or losses [Abstract]          
Included in net income   0   0  
Included in other comprehensive income (loss)   67,000   (124,000)  
Purchases, issuances, sales and settlements [Abstract]          
Purchases   0   0  
Issuances   0   0  
Sales   0   0  
Settlements   (19,000)   (36,000)  
Ending Balance   1,746,000   1,746,000  
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 9,033,000   9,033,000   5,385,000
Fair value of loans with a specific allowance 7,656,000   7,656,000   5,266,000
Specific Allowance 242,000   242,000   858,000
Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 682,140,000   682,140,000   619,848,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 151,000   151,000   144,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 679,565,000   679,565,000   618,052,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 2,424,000   2,424,000   1,652,000
Fair Value, Measurements, Nonrecurring [Member]          
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 9,563,000   9,563,000    
Fair value of loans with a specific allowance 9,321,000   9,321,000    
Specific Allowance 242,000   242,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Total available-for-sale securities 142,573,000   142,573,000   136,324,000
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 142,573,000   142,573,000   136,324,000
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 142,573,000   142,573,000   136,324,000
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 176,012,000   176,012,000   162,705,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 176,012,000   176,012,000   162,705,000
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 176,012,000   176,012,000   162,705,000
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 356,944,000   356,944,000   314,991,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 356,944,000   356,944,000   314,991,000
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 356,944,000   356,944,000   314,991,000
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 2,424,000   2,424,000   1,652,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 1,638,000   1,652,000    
Transfers into Level 3 0   0    
Transfers out of Level 3 0   0    
Total gains or losses [Abstract]          
Included in net income 0   0    
Included in other comprehensive income (loss) 825,000   848,000    
Purchases, issuances, sales and settlements [Abstract]          
Purchases 0   0    
Issuances 0   0    
Sales 0   0    
Settlements (39,000)   (76,000)    
Ending Balance 2,424,000   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 2,424,000   2,424,000   1,652,000
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 2,424,000   2,424,000   1,652,000
Other securities          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,187,000   4,187,000   4,176,000
Other securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,187,000   4,187,000   4,176,000
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 151,000   151,000   144,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,036,000   4,036,000   4,032,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 0   $ 0   $ 0