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Deposits - Additional Information About Corporation's Deposits (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Deposit Liability [Line Items] |  |
Deposits from foreign sources (primarily Mexico) | $ 1,253,790 | $ 1,219,463
Non-interest-bearing public funds deposits | 13,745,461 | 14,441,820
Interest-bearing public funds deposits | 27,938,153 | 28,280,928
Total deposits not covered by deposit insurance | 21,428,987 | 22,972,618
Time deposits not covered by deposit insurance | 2,903,249 | 2,744,112
Public Funds [Member] |  |
Deposit Liability [Line Items] |  |
Non-interest-bearing public funds deposits | 481,175 | 759,819
Interest-bearing public funds deposits | $ 566,995 | $ 625,104

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- Definition Amount of uninsured deposit liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1406 -Paragraph e -Publisher SEC + Details
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- Definition The aggregate of all foreign interest-bearing and noninterest-bearing deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(12)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 235 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-05(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-1 + Details
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