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Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Available for sale, Amortized Cost    
Due in one year or less $ 71,157  
Due after one year through five years 93,074  
Due after five years through ten years 53,898  
Due after ten years 496,834  
Agency mortgage-backed securities 496,330  
Amortized Cost 1,211,293 $ 882,682
Available for sale, Estimated Fair Value    
Due in one year or less 71,191  
Due after one year through five years 93,129  
Due after five years through ten years 54,375  
Due after ten years 495,353  
Agency mortgage-backed securities 505,766  
Securities available-for-sale 1,219,814 912,429
Held to maturity, Amortized Cost    
Due in one year or less 209  
Due after one year through five years 12,942  
Due after five years through ten years 142,672  
Due after ten years 208,317  
Agency mortgage-backed securities 74,972  
Amortized Cost 439,112 488,059
Held to maturity, Estimated Fair Value    
Due in one year or less 214  
Due after one year through five years 13,250  
Due after five years through ten years 147,389  
Due after ten years 207,815  
Agency mortgage-backed securities 75,957  
Fair Value $ 444,625 $ 501,523