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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 116,466 | $ 143,467
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (3,506) | (2,794)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,878,261 | 2,887,122
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (361,287) | (333,485)
Fair Value of Available-for-Sale Securities, Total | 2,994,727 | 3,030,589
Unrealized Losses of Available-for-Sale Securities, Total | (364,793) | (336,279)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 52,941 | 69,991
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,440) | (1,158)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,082,683 | 1,062,828
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (120,217) | (110,905)
Fair Value of Held-to-Matuirty Securities, Total | 1,135,624 | 1,132,819
Unrealized Losses of Held-to-Maturity Securities | (121,657) | (112,063)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 29,035 | 2,742
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (529) | (2)
Fair Value of Available-for-Sale Securities, 12 Months or More | 177,346 | 180,569
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (18,008) | (17,091)
Fair Value of Available-for-Sale Securities, Total | 206,381 | 183,311
Unrealized Losses of Available-for-Sale Securities, Total | (18,537) | (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 | 40,011 | 40,677
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (3,342) | (2,607)
Fair Value of Held-to-Matuirty Securities, Total | 40,011 | 40,677
Unrealized Losses of Held-to-Maturity Securities | (3,342) | (2,607)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 34,770 | 102,831
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (956) | (2,166)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,365,034 | 1,392,318
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (214,231) | (189,391)
Fair Value of Available-for-Sale Securities, Total | 1,399,804 | 1,495,149
Unrealized Losses of Available-for-Sale Securities, Total | (215,187) | (191,557)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 42,125 | 48,498
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (960) | (861)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 80,859 | 65,573
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (5,133) | (3,501)
Fair Value of Held-to-Matuirty Securities, Total | 122,984 | 114,071
Unrealized Losses of Held-to-Maturity Securities | (6,093) | (4,362)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 9,298
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | (226)
Fair Value of Available-for-Sale Securities, 12 Months or More | 173,541 | 166,107
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (16,614) | (15,891)
Fair Value of Available-for-Sale Securities, Total | 173,541 | 175,405
Unrealized Losses of Available-for-Sale Securities, Total | (16,614) | (16,117)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 17,486 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (15) | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 212,754 | 213,838
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (6,406) | (7,551)
Fair Value of Available-for-Sale Securities, Total | 230,240 | 213,838
Unrealized Losses of Available-for-Sale Securities, Total | (6,421) | (7,551)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 32,760 | 28,596
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (921) | (400)
Fair Value of Available-for-Sale Securities, 12 Months or More | 782,538 | 769,860
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (80,726) | (75,531)
Fair Value of Available-for-Sale Securities, Total | 815,298 | 798,456
Unrealized Losses of Available-for-Sale Securities, Total | (81,647) | (75,931)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 10,816 | 21,493
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (480) | (297)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 961,813 | 956,578
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (111,742) | (104,797)
Fair Value of Held-to-Matuirty Securities, Total | 972,629 | 978,071
Unrealized Losses of Held-to-Maturity Securities | (112,222) | (105,094)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 2,415 | 0
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (1,085) | 0
Fair Value of Available-for-Sale Securities, 12 Months or More | 167,048 | 164,430
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (25,302) | (28,030)
Fair Value of Available-for-Sale Securities, Total | 169,463 | 164,430
Unrealized Losses of Available-for-Sale Securities, Total | $ (26,387) | $ (28,030)

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