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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available for sale, Amortized Cost    
Due in one year or less $ 2,940  
Due after one year through five years 110,538  
Due after five years through ten years 15,710  
Due after ten years 3,362  
Agency mortgage-backed securities 470,941  
Amortized Cost 603,491 $ 463,143
Available for sale, Estimated Fair Value    
Due in one year or less 2,960  
Due after one year through five years 111,122  
Due after five years through ten years 16,241  
Due after ten years 3,142  
Agency mortgage-backed securities 469,656  
Available for sale, fair value 603,121 460,797
Held to maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 184  
Due after five years through ten years 12,996  
Due after ten years 1,524  
Agency mortgage-backed securities 61,464  
Amortized Cost 76,168 80,463
Held to maturity, Estimated Fair Value    
Due in one year or less 0  
Due after one year through five years 194  
Due after five years through ten years 13,126  
Due after ten years 1,528  
Agency mortgage-backed securities 61,412  
Held to maturity, fair value $ 76,260 $ 79,639