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Investments - Textual (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
security
investments
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
security
investments
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities          
Available-for-sale Securities Pledged as Collateral $ 112,265,000   $ 112,265,000    
Available-for-sale Securities, Gross Unrealized Gain (Loss)     4,168,000 $ 8,896,000  
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities 301,000 $ 26,000 601,000 137,000  
Debt securities, amortized cost 426,092,000   426,092,000    
Transfer of securities from available-for-sale to held-to-maturity     0 31,346,000 $ 31,346,000
Fair value of held-to-maturity investment securities transferred         32,047,000
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity     0 $ 163,000 163,000
AOCI available-for-sale securities adjustment tax 1,715,000   1,715,000   3,661,000
Unaccreted balance $ 140,000   $ 140,000   142,000
U.S. Government agencies          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 14   14    
Debt securities, amortized cost $ 49,663,000   $ 49,663,000   33,088,000
Obligations of states and political subdivisions          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 145   145    
Debt securities, amortized cost $ 161,817,000   $ 161,817,000   143,343,000
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 $ 204,476,000   $ 204,476,000   236,629,000
Private label residential mortgage backed securities          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Gross Unrealized Gain (Loss)     $ 1,624,000    
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 $ 2,636,000   $ 2,636,000   3,079,000
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 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 32   32    
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 18   18    
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 0   0    
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 13   13    
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 $ 2,234,000   $ 2,234,000