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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Available for Sale (Detail) $ in Thousands | Sep. 30, 2025 USD ($) Security | Dec. 31, 2024 USD ($) Security
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 267 | 527
Less than 12 months, Fair Value | $ 1,508,371 | $ 2,170,778
Less than 12 months, Unrealized Losses | $ (21,645) | $ (31,313)
12 months or more, Count | Security | 2,215 | 2,721
12 months or more, Fair Value | $ 4,038,950 | $ 4,554,200
12 months or more, Unrealized Losses | $ (445,690) | $ (606,852)
Total Count | Security | 2,482 | 3,248
Total Fair Value | $ 5,547,321 | $ 6,724,978
Total Unrealized Losses | $ (467,335) | $ (638,165)
U.S. Treasury [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 7 | 93
Less than 12 months, Fair Value | $ 79,522 | $ 635,739
Less than 12 months, Unrealized Losses | $ (168) | $ (6,319)
12 months or more, Count | Security | 7 | 9
12 months or more, Fair Value | $ 75,611 | $ 142,518
12 months or more, Unrealized Losses | $ (582) | $ (1,753)
Total Count | Security | 14 | 102
Total Fair Value | $ 155,133 | $ 778,257
Total Unrealized Losses | $ (750) | $ (8,072)
U.S. Agencies [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 1 | 4
Less than 12 months, Fair Value | $ 8,583 | $ 20,858
Less than 12 months, Unrealized Losses | $ (167) | $ (46)
12 months or more, Count | Security |  | 5
12 months or more, Fair Value |  | $ 56,712
12 months or more, Unrealized Losses |  | $ (279)
Total Count | Security | 1 | 9
Total Fair Value | $ 8,583 | $ 77,570
Total Unrealized Losses | $ (167) | $ (325)
Mortgage-backed [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 99 | 159
Less than 12 months, Fair Value | $ 697,377 | $ 1,293,953
Less than 12 months, Unrealized Losses | $ (3,896) | $ (22,468)
12 months or more, Count | Security | 829 | 834
12 months or more, Fair Value | $ 2,951,837 | $ 3,055,882
12 months or more, Unrealized Losses | $ (369,853) | $ (502,489)
Total Count | Security | 928 | 993
Total Fair Value | $ 3,649,214 | $ 4,349,835
Total Unrealized Losses | $ (373,749) | $ (524,957)
State and political subdivisions [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 147 | 264
Less than 12 months, Fair Value | $ 610,974 | $ 173,006
Less than 12 months, Unrealized Losses | $ (17,306) | $ (2,392)
12 months or more, Count | Security | 1,215 | 1,629
12 months or more, Fair Value | $ 800,722 | $ 953,458
12 months or more, Unrealized Losses | $ (68,985) | $ (88,652)
Total Count | Security | 1,362 | 1,893
Total Fair Value | $ 1,411,696 | $ 1,126,464
Total Unrealized Losses | $ (86,291) | $ (91,044)
Corporates [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 2 |
Less than 12 months, Fair Value | $ 2,244 |
Less than 12 months, Unrealized Losses | $ (6) |
12 months or more, Count | Security | 161 | 239
12 months or more, Fair Value | $ 194,933 | $ 315,109
12 months or more, Unrealized Losses | $ (6,221) | $ (13,629)
Total Count | Security | 163 | 239
Total Fair Value | $ 197,177 | $ 315,109
Total Unrealized Losses | $ (6,227) | $ (13,629)
Collateralized loan obligations [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 11 | 7
Less than 12 months, Fair Value | $ 109,671 | $ 47,222
Less than 12 months, Unrealized Losses | $ (102) | $ (88)
12 months or more, Count | Security | 3 | 5
12 months or more, Fair Value | $ 15,847 | $ 30,521
12 months or more, Unrealized Losses | $ (49) | $ (50)
Total Count | Security | 14 | 12
Total Fair Value | $ 125,518 | $ 77,743
Total Unrealized Losses | $ (151) | $ (138)

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