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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Available for sale, Amortized Cost    
Due in one year or less $ 52,457  
Due after one year through five years 76,529  
Due after five years through ten years 11,912  
Due after ten years 2,900  
Mortgage-backed securities 319,345  
Amortized Cost 463,143 $ 450,915
Available for sale, Estimated Fair Value    
Due in one year or less 52,574  
Due after one year through five years 77,254  
Due after five years through ten years 11,842  
Due after ten years 2,620  
Mortgage-backed securities 316,507  
Securities available for sale 460,797 451,770
Held to maturity, Amortized Cost    
Due in one year or less 658  
Due after one year through five years 5,609  
Due after five years through ten years 7,380  
Due after ten years 1,112  
Mortgage-backed securities 65,704  
Amortized Cost 80,463 43,714
Held to maturity, Estimated Fair Value    
Due in one year or less 655  
Due after one year through five years 5,559  
Due after five years through ten years 7,241  
Due after ten years 1,073  
Mortgage-backed securities 65,111  
Held to maturity, fair value $ 79,639 $ 43,441