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Fair Value Measurements - Assets and Liabilities Measured at Estimated Fair Value on Recurring Basis (Detail) - Recurring - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value Measurements |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | $ 102,000 | $ 106,000
Investment securities available for sale: | 16,727,000 | 10,440,000
Equity securities | 257,000 | 268,000
Real estate loans held for sale | 958,000 | 379,000
Other assets | 286,000 | 324,000
Total assets | 18,330,000 | 11,517,000
Other liabilities | 679,000 | 943,000
Total liabilities | 679,000 | 943,000
Fair Value Measurements | U.S. Treasury and federal agencies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,860,000 | 7,705,000
Fair Value Measurements | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 3,177,000 | 416,000
Fair Value Measurements | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 5,589,000 | 2,154,000
Fair Value Measurements | Other debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 101,000 | 165,000
Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Trading account | 102,000 | 101,000
Investment securities available for sale: | 0 | 0
Equity securities | 244,000 | 258,000
Real estate loans held for sale | 0 | 0
Other assets | 0 | 0
Total assets | 346,000 | 359,000
Other liabilities | 0 | 0
Total liabilities | 0 | 0
Level 1 | U.S. Treasury and federal agencies |  |
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 debt securities |  |
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 | 5,000
Investment securities available for sale: | 16,727,000 | 10,440,000
Equity securities | 13,000 | 10,000
Real estate loans held for sale | 958,000 | 379,000
Other assets | 257,000 | 309,000
Total assets | 17,955,000 | 11,143,000
Other liabilities | 658,000 | 911,000
Total liabilities | 658,000 | 911,000
Level 2 | U.S. Treasury and federal agencies |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 7,860,000 | 7,705,000
Level 2 | Commercial |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 3,177,000 | 416,000
Level 2 | Residential |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 5,589,000 | 2,154,000
Level 2 | Other debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | 101,000 | 165,000
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 | 29,000 | 15,000
Total assets | 29,000 | 15,000
Other liabilities | 21,000 | 32,000
Total liabilities | 21,000 | 32,000
Level 3 | U.S. Treasury and federal agencies |  |
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 debt securities |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Investment securities available for sale: | $ 0 | $ 0

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