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Investment Securities - Textual (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
security
Dec. 31, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax   $ (891,000) $ 7,474,000  
Transfer of securities from available-for-sale to held-to-maturity $ 8,500,000 23,100,000 0 $ 31,000,000
Gross realized gains from sales or calls   696,000 14,000 0
Available-for-sale Securities, Transfers to Held-to-maturity, Fair Value   23,100,000   32,000,000
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity   0 0 163,000
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax   515,000 615,000 372,000
Accumulated Other Comprehensive Income Available For Sale Securities Adjustment Tax   (375,000) $ 3,076,000  
Threshold Period of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment     12 months  
Threshold Percentage of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment     10.00%  
Threshold Amount of Value Decline in Available-for-sale Securities to be considered Other than Temporary Impairment     $ 10,000  
Debt securities, amortized cost   548,640,000 470,080,000  
OTTI charge   136,000 0  
Available-for-sale investment securities, Amortized cost   548,640,000 470,080,000  
Available-for-sale Securities Pledged as Collateral   88,903,000 119,773,000  
Held-to-maturity Securities, Number of Securities Sold | security 5      
Investments, Number of Securities Sold | security 13      
Accumulated Other Comprehensive Income (Loss), Available for Sale Securities Transferred to Held to Maturity, Unaccreted Balance   0 64,000  
Other than temporary impairment losses on investment securities   136,000 0 $ 0
Securities Pledged as Collateral        
Schedule of Available-for-sale Securities        
Available-for-sale investment securities, Amortized cost   $ 86,418,000 116,268,000  
U.S. Government agencies        
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Number of Positions | security   21    
Debt securities, amortized cost   $ 69,005,000 52,803,000  
U.S. Government agencies | Less than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   7    
U.S. Government agencies | Greater than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   4    
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    
Available-for-sale Securities, Number of Positions | security   172    
Debt securities, amortized cost   $ 288,543,000 181,785,000  
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    
Obligations of states and political subdivisions | Less than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   57    
Obligations of states and political subdivisions | Greater than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   0    
U.S. Government agencies collateralized by residential mortgage obligations        
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Number of Positions | security   147    
Debt securities, amortized cost   $ 181,785,000 225,636,000  
U.S. Government agencies collateralized by residential mortgage obligations | Less than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   34    
U.S. Government agencies collateralized by residential mortgage obligations | Greater than 12 months        
Schedule of Available-for-sale Securities        
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   9    
Private label residential mortgage backed securities        
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss), before Tax   $ 1,036,000    
Available-for-sale Securities, Number of Positions | security   16    
Available-for-sale, Securities in Unrealized Loss Positions, Number of Positions | security   0    
Debt securities, amortized cost   $ 1,807,000 $ 2,356,000  
Private label residential mortgage backed securities | External Credit Rating, Non Investment Grade [Member]        
Schedule of Available-for-sale Securities        
Available-for-sale Securities, Number of Positions | security   12    
Debt securities, amortized cost   $ 2,707,000