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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Available for sale, Amortized Cost    
Due in one year or less $ 52,384  
Due after one year through five years 70,128  
Due after five years through ten years 8,836  
Due after ten years 3,529  
Agency mortgage-backed securities 336,693  
Amortized Cost 471,570 $ 450,915
Available for sale, Estimated Fair Value    
Due in one year or less 52,637  
Due after one year through five years 72,153  
Due after five years through ten years 9,328  
Due after ten years 3,276  
Agency mortgage-backed securities 342,215  
Available for sale, fair value 479,609 451,770
Held to maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 8,189  
Due after five years through ten years 6,588  
Due after ten years 0  
Agency mortgage-backed securities 26,254  
Amortized Cost 41,031 43,714
Held to maturity, Estimated Fair Value    
Due in one year or less 0  
Due after one year through five years 8,356  
Due after five years through ten years 6,778  
Due after ten years 0  
Agency mortgage-backed securities 27,084  
Held to maturity, fair value $ 42,218 $ 43,441