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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available for sale, Amortized Cost    
Due in one year or less $ 12,193  
Due after one year through five years 110,517  
Due after five years through ten years 12,688  
Due after ten years 5,039  
Agency mortgage-backed securities 551,552  
Amortized Cost 691,989 $ 647,141
Available for sale, Estimated Fair Value    
Due in one year or less 12,107  
Due after one year through five years 108,231  
Due after five years through ten years 12,678  
Due after ten years 4,965  
Agency mortgage-backed securities 532,347  
Available for sale, fair value 670,328 641,382
Held to maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 868  
Due after five years through ten years 11,294  
Due after ten years 359  
Agency mortgage-backed securities 54,610  
Amortized Cost 67,131 73,749
Held to maturity, Estimated Fair Value    
Due in one year or less 0  
Due after one year through five years 856  
Due after five years through ten years 10,995  
Due after ten years 352  
Agency mortgage-backed securities 52,213  
Held to maturity, fair value $ 64,416 $ 73,458