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Investment Securities - Amortized Cost and Estimated Fair Value of Securities Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost |  |
Due in one year or less, Amortized Cost | $ 15,856 |
Due in one year or less, Amortized Cost | 0 |
Due after one year through five years, Amortized Cost | 235,704 |
Due after one year through five years, Amortized Cost | 28,202 |
Due after five years through ten years, Amortized Cost | 396,977 |
Due after five years through ten years, Amortized Cost | 313,321 |
Due after ten years, Amortized Cost | 890,325 |
Due after ten years, Amortized Cost | 811,991 |
Amortized Cost | 3,763,609 | $ 3,840,927
Amortized Cost | 1,282,591 | 1,283,987
Estimated Fair Value |  |
Due in one year or less, Estimated Fair Value | 15,686 |
Due in one year or less, Estimated Fair Value | 0 |
Due after one year through five years, Estimated Fair Value | 220,573 |
Due after one year through five years, Estimated Fair Value | 26,487 |
Due after five years through ten years, Estimated Fair Value | 355,394 |
Due after five years through ten years, Estimated Fair Value | 283,296 |
Due after ten years, Estimated Fair Value | 821,615 |
Due after ten years, Estimated Fair Value | 726,378 |
Total, Estimated Fair Value | 3,400,884 | 3,507,841
Estimated Fair Value | 1,159,145 | 1,170,481
U.S. government-sponsored mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 1,667,526 |
Securities not due at a single maturity date, Amortized Cost | 129,077 |
Amortized Cost | 1,667,526 | 1,711,668
Amortized Cost | 129,077 | 130,278
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 1,452,735 |
Securities not due at a single maturity date, Estimated Fair Value | 122,984 |
Total, Estimated Fair Value | 1,452,735 | 1,520,421
Estimated Fair Value | 122,984 | 126,022
Private mortgage-backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 190,155 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 190,155 | 191,522
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 173,541 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | 173,541 | 175,405
Non-government-sponsored asset backed securities |  |
Amortized Cost |  |
Securities not due at a single maturity date, Amortized Cost | 367,066 |
Securities not due at a single maturity date, Amortized Cost | 0 |
Amortized Cost | 367,066 | 370,203
Estimated Fair Value |  |
Securities not due at a single maturity date, Estimated Fair Value | 361,340 |
Securities not due at a single maturity date, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 361,340 | $ 363,473

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