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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

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