v3.26.3
Investments - Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Available for sale, Amortized Cost    
Due in one year or less $ 171,797  
Due after one year through five years 21,763  
Due after five years through ten years 462,963  
Due after ten years 280,177  
Agency mortgage-backed securities 2,044,967  
Amortized Cost 2,981,667 $ 2,738,293
Available for sale, Estimated Fair Value    
Due in one year or less 171,271  
Due after one year through five years 21,179  
Due after five years through ten years 379,500  
Due after ten years 239,165  
Agency mortgage-backed securities 1,919,481  
Fair Value 2,730,596 2,655,035
Held to maturity, Amortized Cost    
Due in one year or less 11,428  
Due after one year through five years 136,465  
Due after five years through ten years 292,655  
Due after ten years 554,166  
Agency mortgage-backed securities 35,535  
Amortized Cost 1,030,249 1,075,102
Held to maturity, Estimated Fair Value    
Due in one year or less 11,332  
Due after one year through five years 131,596  
Due after five years through ten years 268,849  
Due after ten years 470,810  
Agency mortgage-backed securities 31,397  
Total securities held-to-maturity $ 913,984 $ 1,039,814