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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | $ 20,807,000 | $ 19,054,000
Investment securities available for sale, gross unrealized gains | 113,000 | 34,000
Investment securities available for sale, gross unrealized losses | 121,000 | 239,000
Available for sale (cost: $20,807 at March 31, 2025; $19,054 at December 31, 2024) | 20,799,000 | 18,849,000
Total debt securities Amortized cost | 34,159,000 | 33,249,000
Total debt securities Gross unrealized gains | 121,000 | 43,000
Total debt securities Gross unrealized losses | 1,173,000 | 1,488,000
Total debt securities Estimated fair value | 33,107,000 | 31,804,000
Readily marketable securities Amortized cost | 280,000 | 235,000
Readily marketable securities Gross unrealized gains | 2,000 | 3,000
Readily marketable securities Gross unrealized losses | 2,000 | 3,000
Readily marketable securities Estimated fair value | 280,000 | 235,000
Other securities, Amortized cost | 706,000 | 772,000
Other securities, Estimated fair value | 706,000 | 772,000
Equity and other securities, cost | 986,000 | 1,007,000
Equity securities, Gross Unrealized Gains | 2,000 | 3,000
Equity securities, Gross Unrealized Losses | 2,000 | 3,000
Equity and other securities (cost: $986 at March 31, 2025; $1,007 at December 31, 2024) | 986,000 | 1,007,000
Accrued interest and other assets | 9,730,000 | 9,510,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 13,352,000 | 14,195,000
Gross unrealized gains for held to maturity | 8,000 | 9,000
Gross unrealized losses for held to maturity | 1,052,000 | 1,249,000
Investment securities, held to maturity, fair value | 12,308,000 | 12,955,000
Accrued interest and other assets | 9,730,000 | 9,510,000
Debt Securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued interest and other assets | 168,000 | 176,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Accrued interest and other assets | 168,000 | 176,000
U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 8,065,000 | 7,945,000
Investment securities available for sale, gross unrealized gains | 31,000 | 13,000
Investment securities available for sale, gross unrealized losses | 11,000 | 27,000
Available for sale (cost: $20,807 at March 31, 2025; $19,054 at December 31, 2024) | 8,085,000 | 7,931,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 442,000 | 1,015,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 10,000 | 14,000
Investment securities, held to maturity, fair value | 432,000 | 1,001,000
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 4,316,000 | 3,739,000
Investment securities available for sale, gross unrealized gains | 35,000 | 8,000
Investment securities available for sale, gross unrealized losses | 11,000 | 45,000
Available for sale (cost: $20,807 at March 31, 2025; $19,054 at December 31, 2024) | 4,340,000 | 3,702,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,035,000 | 2,034,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 114,000 | 157,000
Investment securities, held to maturity, fair value | 1,921,000 | 1,877,000
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 8,422,000 | 7,368,000
Investment securities available for sale, gross unrealized gains | 47,000 | 13,000
Investment securities available for sale, gross unrealized losses | 99,000 | 167,000
Available for sale (cost: $20,807 at March 31, 2025; $19,054 at December 31, 2024) | 8,370,000 | 7,214,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 8,547,000 | 8,773,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 800,000 | 961,000
Investment securities, held to maturity, fair value | 7,747,000 | 7,812,000
Other |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 4,000 | 2,000
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 0 | 0
Available for sale (cost: $20,807 at March 31, 2025; $19,054 at December 31, 2024) | 4,000 | 2,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 1,000 | 1,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 0 | 0
Investment securities, held to maturity, fair value | 1,000 | 1,000
State and political subdivisions |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,291,000 | 2,335,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 128,000 | 117,000
Investment securities, held to maturity, fair value | 2,163,000 | 2,218,000
Privately issued |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 36,000 | 37,000
Gross unrealized gains for held to maturity | 8,000 | 9,000
Gross unrealized losses for held to maturity | 0 | 0
Investment securities, held to maturity, fair value | $ 44,000 | $ 46,000

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