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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 621,204,000   $ 621,204,000   $ 619,848,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   $ 1,746,000   $ 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)   (66,000)   (190,000)  
Purchases, issuances, sales and settlements [Abstract]          
Purchases   0   0  
Issuances   0   0  
Sales   0   0  
Settlements   (19,000)   (55,000)  
Ending Balance   1,661,000   1,661,000  
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 17,339,000   17,339,000   5,385,000
Fair value of loans with a specific allowance 15,260,000   15,260,000   5,266,000
Specific Allowance 295,000   295,000   858,000
Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 621,204,000   621,204,000   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 175,000   175,000   144,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 618,328,000   618,328,000   618,052,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 2,701,000   2,701,000   1,652,000
Fair Value, Measurements, Nonrecurring [Member]          
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 7,092,000   7,092,000    
Fair value of loans with a specific allowance 6,793,000   6,793,000    
Specific Allowance 299,000   299,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Total available-for-sale securities 126,401,000   126,401,000   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 126,401,000   126,401,000   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 126,401,000   126,401,000   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 172,526,000   172,526,000   162,705,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 172,526,000   172,526,000   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 172,526,000   172,526,000   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 315,357,000   315,357,000   314,991,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 315,357,000   315,357,000   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 315,357,000   315,357,000   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 2,701,000   2,701,000   1,652,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance 2,424,000   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) 318,000   1,166,000    
Purchases, issuances, sales and settlements [Abstract]          
Purchases 0   0    
Issuances 0   0    
Sales 0   0    
Settlements (41,000)   (117,000)    
Ending Balance 2,701,000   2,701,000    
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 2,701,000   2,701,000   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 2,701,000   2,701,000   1,652,000
Other securities          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,219,000   4,219,000   4,176,000
Other securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,219,000   4,219,000   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 175,000   175,000   144,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,044,000   4,044,000   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