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Investments - Textual (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
security
investments
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
security
investments
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities          
Available-for-sale Securities Pledged as Collateral $ 126,238   $ 126,238    
Available-for-sale Securities, Gross Unrealized Gain (Loss)     8,114 $ 8,896  
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities 0 $ 99 601 236  
Debt securities, amortized cost 444,728   444,728    
Transfer of securities from available-for-sale to held-to-maturity     0 31,346 $ 31,346
Fair value of held-to-maturity investment securities transferred         32,047
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity     0 $ 163 163
AOCI available-for-sale securities adjustment tax 3,339   3,339   3,661
Unaccreted balance $ 138   $ 138   142
U.S. Government agencies          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 15   15    
Debt securities, amortized cost $ 51,679   $ 51,679   33,088
Obligations of states and political subdivisions          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 150   150    
Debt securities, amortized cost $ 174,758   $ 174,758   143,343
U.S. Government agencies collateralized by residential mortgage obligations          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 180   180    
Debt securities, amortized cost $ 208,318   $ 208,318   236,629
Private label residential mortgage backed securities          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Gross Unrealized Gain (Loss)     $ 1,272    
Available-for-sale Securities, Number of Positions | security 17   17    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 0   0    
Debt securities, amortized cost $ 2,473   $ 2,473   3,079
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   $ 7,500   $ 7,500
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 4   4    
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 25   25    
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 15   15    
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 1   1    
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 9   9    
Debt securities, amortized cost $ 2,155   $ 2,155