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Securities - Gross Unrealized Losses and Fair Value of Investment Securities Available for Sale (Detail) $ in Thousands | Mar. 31, 2026 USD ($) Security | Dec. 31, 2025 USD ($) Security
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 796 | 264
Less than 12 months, Fair Value | $ 3,537,971 | $ 1,519,913
Less than 12 months, Unrealized Losses | $ (36,868) | $ (17,173)
12 months or more, Count | Security | 1,727 | 2,096
12 months or more, Fair Value | $ 3,651,505 | $ 3,878,183
12 months or more, Unrealized Losses | $ (408,394) | $ (391,573)
Total Count | Security | 2,523 | 2,360
Total Fair Value | $ 7,189,476 | $ 5,398,096
Total Unrealized Losses | $ (445,262) | $ (408,746)
U.S. Treasury [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 77 | 8
Less than 12 months, Fair Value | $ 594,413 | $ 72,013
Less than 12 months, Unrealized Losses | $ (2,942) | $ (88)
12 months or more, Count | Security | 1 | 2
12 months or more, Fair Value | $ 14,815 | $ 30,234
12 months or more, Unrealized Losses | $ (178) | $ (353)
Total Count | Security | 78 | 10
Total Fair Value | $ 609,228 | $ 102,247
Total Unrealized Losses | $ (3,120) | $ (441)
U.S. Agencies [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 1 | 1
Less than 12 months, Fair Value | $ 7,569 | $ 7,855
Less than 12 months, Unrealized Losses | $ (66) | $ (100)
Total Count | Security | 1 | 1
Total Fair Value | $ 7,569 | $ 7,855
Total Unrealized Losses | $ (66) | $ (100)
Mortgage-backed [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 212 | 82
Less than 12 months, Fair Value | $ 1,987,192 | $ 757,160
Less than 12 months, Unrealized Losses | $ (18,766) | $ (5,682)
12 months or more, Count | Security | 798 | 817
12 months or more, Fair Value | $ 2,696,163 | $ 2,871,729
12 months or more, Unrealized Losses | $ (325,259) | $ (325,469)
Total Count | Security | 1,010 | 899
Total Fair Value | $ 4,683,355 | $ 3,628,889
Total Unrealized Losses | $ (344,025) | $ (331,151)
State and political subdivisions [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 474 | 152
Less than 12 months, Fair Value | $ 631,510 | $ 515,364
Less than 12 months, Unrealized Losses | $ (14,306) | $ (11,181)
12 months or more, Count | Security | 837 | 1,142
12 months or more, Fair Value | $ 806,914 | $ 809,113
12 months or more, Unrealized Losses | $ (79,697) | $ (61,666)
Total Count | Security | 1,311 | 1,294
Total Fair Value | $ 1,438,424 | $ 1,324,477
Total Unrealized Losses | $ (94,003) | $ (72,847)
Corporates [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security |  | 1
Less than 12 months, Fair Value |  | $ 2,990
Less than 12 months, Unrealized Losses |  | $ (10)
12 months or more, Count | Security | 89 | 134
12 months or more, Fair Value | $ 120,650 | $ 164,108
12 months or more, Unrealized Losses | $ (3,217) | $ (4,078)
Total Count | Security | 89 | 135
Total Fair Value | $ 120,650 | $ 167,098
Total Unrealized Losses | $ (3,217) | $ (4,088)
Collateralized loan obligations [Member] |  |
Gain (Loss) on Investments [Line Items] |  |
Less than 12 months, Count | Security | 32 | 20
Less than 12 months, Fair Value | $ 317,287 | $ 164,531
Less than 12 months, Unrealized Losses | $ (788) | $ (112)
12 months or more, Count | Security | 2 | 1
12 months or more, Fair Value | $ 12,963 | $ 2,999
12 months or more, Unrealized Losses | $ (43) | $ (7)
Total Count | Security | 34 | 21
Total Fair Value | $ 330,250 | $ 167,530
Total Unrealized Losses | $ (831) | $ (119)

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