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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Amortized Cost    
Due in one year or less, Amortized Cost $ 19,327  
Due in one year or less, Amortized Cost 0  
Due after one year through five years, Amortized Cost 224,786  
Due after one year through five years, Amortized Cost 27,498  
Due after five years through ten years, Amortized Cost 401,003  
Due after five years through ten years, Amortized Cost 305,944  
Due after ten years, Amortized Cost 922,418  
Due after ten years, Amortized Cost 820,267  
Amortized Cost 3,840,927 $ 4,445,620
Amortized Cost 1,283,987 1,289,710
Estimated Fair Value    
Due in one year or less, Estimated Fair Value 19,140  
Due in one year or less, Estimated Fair Value 0  
Due after one year through five years, Estimated Fair Value 211,009  
Due after one year through five years, Estimated Fair Value 26,042  
Due after five years through ten years, Estimated Fair Value 358,789  
Due after five years through ten years, Estimated Fair Value 278,676  
Due after ten years, Estimated Fair Value 859,604  
Due after ten years, Estimated Fair Value 739,741  
Total, Estimated Fair Value 3,507,841 4,041,590
Estimated Fair Value 1,170,481 1,126,146
U.S. government-sponsored mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 1,711,668  
Securities not due at a single maturity date, Amortized Cost 130,278  
Amortized Cost 1,711,668 1,900,796
Amortized Cost 130,278 135,000
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 1,520,421  
Securities not due at a single maturity date, Estimated Fair Value 126,022  
Total, Estimated Fair Value 1,520,421 1,685,462
Estimated Fair Value 126,022 131,375
Private mortgage-backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 191,522  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 191,522 197,435
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 175,405  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value 175,405 179,133
Non-government-sponsored asset backed securities    
Amortized Cost    
Securities not due at a single maturity date, Amortized Cost 370,203  
Securities not due at a single maturity date, Amortized Cost 0  
Amortized Cost 370,203 428,933
Estimated Fair Value    
Securities not due at a single maturity date, Estimated Fair Value 363,473  
Securities not due at a single maturity date, Estimated Fair Value 0  
Total, Estimated Fair Value $ 363,473 $ 414,374