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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 134,631 | $ 143,467
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (3,744) | (2,794)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,566,329 | 2,887,122
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (334,860) | (333,485)
Fair Value of Available-for-Sale Securities, Total | 2,700,960 | 3,030,589
Unrealized Losses of Available-for-Sale Securities, Total | (338,604) | (336,279)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 77,866 | 69,991
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (3,016) | (1,158)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,064,094 | 1,062,828
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (129,287) | (110,905)
Fair Value of Held-to-Maturity Securities, Total | 1,141,960 | 1,132,819
Unrealized Losses of Held-to-Maturity Securities | (132,303) | (112,063)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 25,946 | 2,742
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (326) | (2)
Fair Value of Available-for-Sale Securities, 12 Months or More | 161,759 | 180,569
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (13,746) | (17,091)
Fair Value of Available-for-Sale Securities, Total | 187,705 | 183,311
Unrealized Losses of Available-for-Sale Securities, Total | (14,072) | (17,093)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | 0 | 0
Fair Value of Held-to-Maturity Securities, 12 Months or More | 40,539 | 40,677
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (3,021) | (2,607)
Fair Value of Held-to-Maturity Securities, Total | 40,539 | 40,677
Unrealized Losses of Held-to-Maturity Securities | (3,021) | (2,607)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 34,597 | 102,831
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,088) | (2,166)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,215,317 | 1,392,318
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (202,451) | (189,391)
Fair Value of Available-for-Sale Securities, Total | 1,249,914 | 1,495,149
Unrealized Losses of Available-for-Sale Securities, Total | (203,539) | (191,557)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 48,254 | 48,498
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,979) | (861)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 69,220 | 65,573
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (4,716) | (3,501)
Fair Value of Held-to-Maturity Securities, Total | 117,474 | 114,071
Unrealized Losses of Held-to-Maturity Securities | (6,695) | (4,362)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 9,491 | 9,298
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (129) | (226)
Fair Value of Available-for-Sale Securities, 12 Months or More | 161,903 | 166,107
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (13,120) | (15,891)
Fair Value of Available-for-Sale Securities, Total | 171,394 | 175,405
Unrealized Losses of Available-for-Sale Securities, Total | (13,249) | (16,117)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 10,849 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (60) | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 92,857 | 213,838
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (3,374) | (7,551)
Fair Value of Available-for-Sale Securities, Total | 103,706 | 213,838
Unrealized Losses of Available-for-Sale Securities, Total | (3,434) | (7,551)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 46,591 | 28,596
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,230) | (400)
Fair Value of Available-for-Sale Securities, 12 Months or More | 761,289 | 769,860
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (84,799) | (75,531)
Fair Value of Available-for-Sale Securities, Total | 807,880 | 798,456
Unrealized Losses of Available-for-Sale Securities, Total | (86,029) | (75,931)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 29,612 | 21,493
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,037) | (297)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 954,335 | 956,578
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (121,550) | (104,797)
Fair Value of Held-to-Maturity Securities, Total | 983,947 | 978,071
Unrealized Losses of Held-to-Maturity Securities | (122,587) | (105,094)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 7,157 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (911) | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 173,204 | 164,430
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (17,370) | (28,030)
Fair Value of Available-for-Sale Securities, Total | 180,361 | 164,430
Unrealized Losses of Available-for-Sale Securities, Total | $ (18,281) | $ (28,030)

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