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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Amortized Cost    
Due in one year or less, Amortized Cost $ 17,732  
Due in one year or less, Amortized Cost 0  
Due after one year through five years, Amortized Cost 274,948  
Due after one year through five years, Amortized Cost 55,827  
Due after five years through ten years, Amortized Cost 364,443  
Due after five years through ten years, Amortized Cost 366,053  
Due after ten years, Amortized Cost 812,292  
Due after ten years, Amortized Cost 731,160  
Amortized Cost 3,410,272 $ 3,840,927
Amortized Cost 1,277,209 1,283,987
Estimated Fair Value    
Due in one year or less, Estimated Fair Value 17,486  
Due in one year or less, Estimated Fair Value 0  
Due after one year through five years, Estimated Fair Value 259,238  
Due after one year through five years, Estimated Fair Value 52,805  
Due after five years through ten years, Estimated Fair Value 332,408  
Due after five years through ten years, Estimated Fair Value 328,829  
Due after ten years, Estimated Fair Value 741,781  
Due after ten years, Estimated Fair Value 643,832  
Total, Estimated Fair Value 3,072,639 3,507,841
Estimated Fair Value 1,142,940 1,170,481
U.S. government-sponsored mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 1,527,463  
Securities not due at a single maturity date, Amortized Cost 124,169  
Amortized Cost 1,527,463 1,711,668
Amortized Cost 124,169 130,278
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 1,324,684  
Securities not due at a single maturity date, Estimated Fair Value 117,474  
Total, Estimated Fair Value 1,324,684 1,520,421
Estimated Fair Value 117,474 126,022
Private mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 184,643  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 184,643 191,522
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 171,394  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value 171,394 175,405
Non-government-sponsored asset backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 228,751  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 228,751 370,203
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 225,648  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value $ 225,648 $ 363,473