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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Available for sale, Amortized Cost    
Due in one year or less $ 22,357  
Due after one year through five years 100,084  
Due after five years through ten years 11,881  
Due after ten years 2,132  
Agency mortgage-backed securities 596,825  
Amortized Cost 733,279 $ 647,141
Available for sale, Estimated Fair Value    
Due in one year or less 22,213  
Due after one year through five years 98,876  
Due after five years through ten years 12,038  
Due after ten years 2,106  
Agency mortgage-backed securities 586,136  
Securities available for sale 721,369 641,382
Held to maturity, Amortized Cost    
Due in one year or less 0  
Due after one year through five years 2,080  
Due after five years through ten years 10,426  
Due after ten years 0  
Agency mortgage-backed securities 53,173  
Amortized Cost 65,679 73,749
Held to maturity, Estimated Fair Value    
Due in one year or less 0  
Due after one year through five years 2,063  
Due after five years through ten years 10,345  
Due after ten years 0  
Agency mortgage-backed securities 51,526  
Held to maturity, fair value $ 63,934 $ 73,458