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Fair Value of Assets and Liabilities (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 556,626,000   $ 556,626,000   $ 518,848,000
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]          
Beginning balance   $ 2,141,000   $ 364,000  
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)   18,000   1,894,000  
Purchases, issuances, sales and settlements [Abstract]          
Purchases   0   0  
Issuances   0   0  
Sales   0   0  
Settlements   (34,000)   (133,000)  
Ending Balance   $ 2,125,000   2,125,000  
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  
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 3,425,000   3,425,000   1,174,000
Fair value of loans with a specific allowance 3,414,000   3,414,000   1,174,000
Specific Allowance 601,000   601,000   134,000
Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 556,626,000   556,626,000   518,848,000
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 110,000   110,000   64,000
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 554,855,000   554,855,000   516,878,000
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 1,661,000   1,661,000   1,906,000
Fair Value, Measurements, Nonrecurring [Member]          
Impaired Loans Receivable [Abstract]          
Carrying amount of loans with a specific allowance 12,215,000   12,215,000    
Fair value of loans with a specific allowance 9,647,000   9,647,000    
Specific Allowance 2,568,000   2,568,000    
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Total available-for-sale securities 48,736,000   48,736,000   90,141,000
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 48,736,000   48,736,000   90,141,000
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 48,736,000   48,736,000   90,141,000
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 160,919,000   160,919,000   110,717,000
Obligations of states and political subdivisions | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 160,919,000   160,919,000   110,717,000
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 160,919,000   160,919,000   110,717,000
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 341,190,000   341,190,000   312,054,000
Residential Mortgage-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 341,190,000   341,190,000   312,054,000
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 341,190,000   341,190,000   312,054,000
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 1,661,000   1,661,000   1,906,000
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    
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    
Trust preferred securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 1,661,000   1,661,000   1,906,000
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 1,661,000   1,661,000   1,906,000
Other securities          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,120,000   4,120,000   4,030,000
Other securities | Fair Value, Measurements, Recurring [Member]          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,120,000   4,120,000   4,030,000
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 110,000   110,000   64,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2)          
Available-for-sale: [Abstract]          
Total available-for-sale securities 4,010,000   4,010,000   3,966,000
Other securities | Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)          
Available-for-sale: [Abstract]          
Total available-for-sale securities $ 0   $ 0   $ 0