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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | $ 96,000 | $ 101,000
Investment securities available for sale: | 20,799,000 | 18,849,000
Equity securities | 280,000 | 235,000
Real estate loans held for sale | 371,000 | 521,000
Other assets | 239,000 | 255,000
Total assets | 21,785,000 | 19,961,000
Other liabilities | 632,000 | 822,000
Total liabilities | 632,000 | 822,000
Fair Value Measurements | U.S. Treasury |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 8,085,000 | 7,931,000
Fair Value Measurements | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 4,340,000 | 3,702,000
Fair Value Measurements | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 8,370,000 | 7,214,000
Fair Value Measurements | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 4,000 | 2,000
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 96,000 | 101,000
Investment securities available for sale: | 0 | 0
Equity securities | 280,000 | 235,000
Real estate loans held for sale | 0 | 0
Other assets | 0 | 0
Total assets | 376,000 | 336,000
Other liabilities | 0 | 0
Total liabilities | 0 | 0
Level 1 | U.S. Treasury |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 1 | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 1 | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 1 | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 0 | 0
Investment securities available for sale: | 20,799,000 | 18,849,000
Equity securities | 0 | 0
Real estate loans held for sale | 371,000 | 521,000
Other assets | 236,000 | 251,000
Total assets | 21,406,000 | 19,621,000
Other liabilities | 632,000 | 790,000
Total liabilities | 632,000 | 790,000
Level 2 | U.S. Treasury |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 8,085,000 | 7,931,000
Level 2 | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 4,340,000 | 3,702,000
Level 2 | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 8,370,000 | 7,214,000
Level 2 | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 4,000 | 2,000
Level 3 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 0 | 0
Investment securities available for sale: | 0 | 0
Equity securities | 0 | 0
Real estate loans held for sale | 0 | 0
Other assets | 3,000 | 4,000
Total assets | 3,000 | 4,000
Other liabilities | 0 | 32,000
Total liabilities | 0 | 32,000
Level 3 | U.S. Treasury |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 3 | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 3 | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 0 | 0
Level 3 | Other |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | $ 0 | $ 0

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