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Investments - Textual (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Schedule of Available-for-sale Securities          
Available-for-sale Securities Pledged as Collateral $ 107,847,000   $ 107,847,000    
Available-for-sale Securities, Gross Unrealized Gain (Loss)     7,061,000   (3,884,000)
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities 26,000 132,000 137,000 466,000  
Transfer of securities from available-for-sale to held-to-maturity     31,346,000 0  
Fair value of held-to-maturity investment securities transferred 32,047,000   32,047,000    
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity     163,000 0  
U.S. Government agencies
          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions 7   7    
Debt Securities, Amortized Cost 17,286,000   17,286,000   18,172,000
Obligations of states and political subdivisions
          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions 142   142    
Debt Securities, Amortized Cost 133,521,000   133,521,000   162,018,000
U.S. Government agencies collateralized by residential mortgage obligations
          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions 211   211    
Debt Securities, Amortized Cost 272,082,000   272,082,000   254,978,000
Private label residential mortgage backed securities
          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Gross Unrealized Gain (Loss)     1,358,000    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions 0   0    
Available-for-sale Equity Securities, Amortized Cost Basis 21   21    
Debt Securities, Amortized Cost 3,677,000   3,677,000   4,344,000
Other equity securities
          
Schedule of Available-for-sale Securities          
Available For Sale Securities, Number of Securities 2   2    
Available-for-sale Equity Securities, Amortized Cost Basis 7,596,000   7,596,000   7,596,000
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 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 5   5    
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 22   22    
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 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 25   25    
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 19   19    
Below investment grade | Private label residential mortgage backed securities
          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions 11   11    
Debt Securities, Amortized Cost $ 3,121,000   $ 3,121,000