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Investments - Textual (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
security
investments
Mar. 31, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
investments
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities              
Other than temporary impairment losses on investment securities $ 0   $ 0 $ 136,000 $ 0    
Available-for-sale Securities Pledged as Collateral 110,723,000     110,723,000      
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 18,031,000     18,031,000     $ 7,474,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities 142,000   $ 301,000 469,000 $ 601,000    
Debt securities, amortized cost 533,044,000     533,044,000      
Transfer of securities from available-for-sale to held-to-maturity   $ 8,500,000       $ 31,000,000  
Fair value of held-to-maturity investment securities transferred 23,100,000     23,100,000   32,000,000  
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity           $ 163,000  
Held-to-maturity Securities, Number of Securities Sold | security   5          
Investments, Number of Securities Sold | security   13          
Held-to-maturity Securities, Sold Security, Realized Gain (Loss)   $ 696,000          
AOCI available-for-sale securities adjustment tax 7,581,000     7,581,000     3,076,000
Unaccreted balance $ 0     $ 0     64,000
U.S. Government agencies              
Schedule of Available-for-sale Securities              
Available-for-sale Securities, Number of Positions | security 17     17      
Debt securities, amortized cost $ 48,007,000     $ 48,007,000     52,803,000
Obligations of states and political subdivisions              
Schedule of Available-for-sale Securities              
Other than Temporary Impairment Losses, Investments, Portion in Other Comprehensive Loss, before Tax, Including Portion Attributable to Noncontrolling Interest, Available-for-sale Securities       $ 136,000      
Other than Temporary Impairment Losses, Investments, Available-for-sale Securities, Number of Impaired Securities | security 1     1      
Available-for-sale Securities, Other than Temporary Impaired Security $ 2,995,000     $ 2,995,000      
Available-for-sale Debt Securities, Other than Temporary Impairment Security, Amortized Cost Basis $ 3,131,000     $ 3,131,000      
Available-for-sale Securities, Number of Positions | security 158     158      
Debt securities, amortized cost $ 227,321,000     $ 227,321,000     181,785,000
U.S. Government agencies collateralized by residential mortgage obligations              
Schedule of Available-for-sale Securities              
Available-for-sale Securities, Number of Positions | security 168     168      
Debt securities, amortized cost $ 248,321,000     $ 248,321,000     225,636,000
Private label residential mortgage backed securities              
Schedule of Available-for-sale Securities              
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax $ 1,064,000     $ 1,064,000      
Available-for-sale Securities, Number of Positions | security 16     16      
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 0     0      
Debt securities, amortized cost $ 1,895,000     $ 1,895,000     2,356,000
Other equity securities              
Schedule of Available-for-sale Securities              
Available For Sale Securities, Number of Securities | investments 1     1      
Available-for-sale Equity Securities, Amortized Cost Basis $ 7,500,000     $ 7,500,000     $ 7,500,000
Less than 12 months | U.S. Government agencies              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 6     6      
Less than 12 months | Obligations of states and political subdivisions              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 13     13      
Less than 12 months | U.S. Government agencies collateralized by residential mortgage obligations              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 28     28      
Greater than 12 months | U.S. Government agencies              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 2     2      
Greater than 12 months | Obligations of states and political subdivisions              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 0     0      
Greater than 12 months | U.S. Government agencies collateralized by residential mortgage obligations              
Schedule of Available-for-sale Securities              
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 11     11      
Below investment grade | Private label residential mortgage backed securities              
Schedule of Available-for-sale Securities              
Available-for-sale Securities, Number of Positions | security 11     11      
Debt securities, amortized cost $ 1,711,000     $ 1,711,000