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Securities - Securities Available for Sale (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 13,747,149 | $ 8,407,676
Gross Unrealized Gains | 98,466 | 4,823
Gross Unrealized Losses | (467,335) | (638,165)
Fair Value | 13,378,280 | 7,774,334
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,180,744 | 1,331,394
Gross Unrealized Gains | 17,757 | 2,751
Gross Unrealized Losses | (750) | (8,072)
Fair Value | 2,197,751 | 1,326,073
U.S. Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 81,171 | 129,246
Gross Unrealized Gains | 422 | 126
Gross Unrealized Losses | (167) | (325)
Fair Value | 81,426 | 129,047
Mortgage-backed [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,160,828 | 4,945,548
Gross Unrealized Gains | 55,196 | 339
Gross Unrealized Losses | (373,749) | (524,957)
Fair Value | 7,842,275 | 4,420,930
State and political subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,541,797 | 1,309,126
Gross Unrealized Gains | 23,996 | 487
Gross Unrealized Losses | (86,291) | (91,044)
Fair Value | 2,479,502 | 1,218,569
Corporates [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 228,546 | 330,739
Gross Unrealized Gains | 217 | 60
Gross Unrealized Losses | (6,227) | (13,629)
Fair Value | 222,536 | 317,170
Collateralized loan obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 554,063 | 361,623
Gross Unrealized Gains | 878 | 1,060
Gross Unrealized Losses | (151) | (138)
Fair Value | $ 554,790 | $ 362,545

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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