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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Available for sale, Amortized Cost    
Due in one year or less $ 1,876  
Due after one year through five years 67,451  
Due after five years through ten years 31,819  
Due after ten years 98,484  
Agency mortgage-backed securities 895,899  
Amortized Cost 1,095,529 $ 733,279
Available for sale, Estimated Fair Value    
Due in one year or less 1,888  
Due after one year through five years 67,377  
Due after five years through ten years 32,135  
Due after ten years 100,241  
Agency mortgage-backed securities 897,544  
Available for sale, fair value 1,099,185 721,369
Held to maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 2,534  
Due after five years through ten years 9,957  
Due after ten years 0  
Agency mortgage-backed securities 51,877  
Amortized Cost 64,368 65,679
Held to maturity, Estimated Fair Value    
Due in one year or less 0  
Due after one year through five years 2,546  
Due after five years through ten years 10,015  
Due after ten years 0  
Agency mortgage-backed securities 51,586  
Held to maturity, fair value $ 64,147 $ 63,934