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Investment Securities - Unrealized Losses and Estimated Fair Value of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | $ 143,467 | $ 2,255,449
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2,794) | (143,387)
Fair Value of Available-for-Sale Securities, 12 Months or More | 2,887,122 | 1,348,287
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (333,485) | (264,580)
Fair Value of Available-for-Sale Securities, Total | 3,030,589 | 3,603,736
Unrealized Losses of Available-for-Sale Securities, Total | (336,279) | (407,967)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 69,991 | 1,102,071
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (1,158) | (161,755)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 1,062,828 | 0
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (110,905) | 0
Fair Value of Held-to-Matuirty Securities, Total | 1,132,819 | 1,102,071
Unrealized Losses of Held-to-Maturity Securities | (112,063) | (161,755)
U.S. government-sponsored enterprises |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 2,742 | 315,531
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2) | (3,056)
Fair Value of Available-for-Sale Securities, 12 Months or More | 180,569 | 128,527
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (17,091) | (20,153)
Fair Value of Available-for-Sale Securities, Total | 183,311 | 444,058
Unrealized Losses of Available-for-Sale Securities, Total | (17,093) | (23,209)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 0 | 39,668
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | 0 | (3,349)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 40,677 | 0
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (2,607) | 0
Fair Value of Held-to-Matuirty Securities, Total | 40,677 | 39,668
Unrealized Losses of Held-to-Maturity Securities | (2,607) | (3,349)
U.S. government-sponsored mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 102,831 | 850,268
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (2,166) | (46,505)
Fair Value of Available-for-Sale Securities, 12 Months or More | 1,392,318 | 807,566
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (189,391) | (168,900)
Fair Value of Available-for-Sale Securities, Total | 1,495,149 | 1,657,834
Unrealized Losses of Available-for-Sale Securities, Total | (191,557) | (215,405)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 48,498 | 106,840
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (861) | (3,756)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 65,573 | 0
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (3,501) | 0
Fair Value of Held-to-Matuirty Securities, Total | 114,071 | 106,840
Unrealized Losses of Held-to-Maturity Securities | (4,362) | (3,756)
Private mortgage-backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 9,298 | 179,133
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (226) | (18,302)
Fair Value of Available-for-Sale Securities, 12 Months or More | 166,107 | 0
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (15,891) | 0
Fair Value of Available-for-Sale Securities, Total | 175,405 | 179,133
Unrealized Losses of Available-for-Sale Securities, Total | (16,117) | (18,302)
Non-government-sponsored asset backed securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 285,724
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | (9,726)
Fair Value of Available-for-Sale Securities, 12 Months or More | 213,838 | 39,133
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (7,551) | (4,928)
Fair Value of Available-for-Sale Securities, Total | 213,838 | 324,857
Unrealized Losses of Available-for-Sale Securities, Total | (7,551) | (14,654)
State and political subdivisions |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 28,596 | 485,817
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | (400) | (50,484)
Fair Value of Available-for-Sale Securities, 12 Months or More | 769,860 | 338,638
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (75,531) | (65,214)
Fair Value of Available-for-Sale Securities, Total | 798,456 | 824,455
Unrealized Losses of Available-for-Sale Securities, Total | (75,931) | (115,698)
Held-to-maturity: |  |
Fair Value of Held-to-Maturity Securities, Less Than 12 Months | 21,493 | 955,563
Unrealized Losses of Held-to-Maturity Securities, Less Than 12 Months | (297) | (154,650)
Fair Value of Held-to-Maturity Securities, 12 Months or More | 956,578 | 0
Unrealized Losses of Held-to-Maturity Securities, 12 Months or More | (104,797) | 0
Fair Value of Held-to-Matuirty Securities, Total | 978,071 | 955,563
Unrealized Losses of Held-to-Maturity Securities | (105,094) | (154,650)
Other securities |  |
Available-for-sale: |  |
Fair Value of Available-for-Sale Securities, Less Than 12 Months | 0 | 138,976
Unrealized Losses of Available-for-Sale Securities, Less Than 12 Months | 0 | (15,314)
Fair Value of Available-for-Sale Securities, 12 Months or More | 164,430 | 34,423
Unrealized Losses of Available-for-Sale Securities, 12 Months or More | (28,030) | (5,385)
Fair Value of Available-for-Sale Securities, Total | 164,430 | 173,399
Unrealized Losses of Available-for-Sale Securities, Total | $ (28,030) | $ (20,699)

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