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Investments - Textual (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
security
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
investments
Schedule of Available-for-sale Securities          
Other than temporary impairment losses on investment securities $ 136,000 $ 0      
Available-for-sale Securities Pledged as Collateral 114,784,000        
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax 13,553,000     $ 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 465,000 $ 299,000      
Debt securities, amortized cost 488,425,000        
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   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 5,578,000     3,076,000  
Unaccreted balance $ 0     64,000  
U.S. Government agencies          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 17        
Debt securities, amortized cost $ 51,194,000     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        
Available-for-sale Securities, Other than Temporary Impaired Security $ 2,995,000        
Available-for-sale Debt Securities, Other than Temporary Impairment Security, Amortized Cost Basis       3,131,000  
Available-for-sale Securities, Number of Positions | security 148        
Debt securities, amortized cost $ 204,242,000     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 179        
Debt securities, amortized cost $ 223,234,000     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 $ 1,119,000        
Available-for-sale Securities, Number of Positions | security 17        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security 0        
Debt securities, amortized cost $ 2,255,000     2,356,000  
Other equity securities          
Schedule of Available-for-sale Securities          
Available For Sale Securities, Number of Securities | investments         1
Available-for-sale Equity Securities, Amortized Cost Basis $ 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        
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 6        
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 31        
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        
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 2        
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        
Below investment grade | Private label residential mortgage backed securities          
Schedule of Available-for-sale Securities          
Available-for-sale Securities, Number of Positions | security 12        
Debt securities, amortized cost $ 2,027,000