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Investment securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | $ 21,458,000 | $ 19,054,000
Investment securities available for sale, gross unrealized gains | 178,000 | 34,000
Investment securities available for sale, gross unrealized losses | 96,000 | 239,000
Investment securities available for sale, estimated fair value | 21,540,000 | 18,849,000
Total debt securities amortized cost | 34,482,000 | 33,249,000
Total debt securities gross unrealized gains | 191,000 | 43,000
Total debt securities gross unrealized losses | 1,060,000 | 1,488,000
Total debt securities estimated fair value | 33,613,000 | 31,804,000
Readily marketable securities amortized cost | 273,000 | 235,000
Readily marketable securities gross unrealized gains | 3,000 | 3,000
Readily marketable securities gross unrealized losses | 2,000 | 3,000
Readily marketable securities estimated fair value | 274,000 | 235,000
Other securities, amortized cost | 730,000 | 772,000
Other securities, estimated fair value | 730,000 | 772,000
Equity and other securities, cost | 1,003,000 | 1,007,000
Equity securities, gross unrealized gains | 3,000 | 3,000
Equity securities, gross unrealized losses | 2,000 | 3,000
Equity and other securities, estimated fair value | 1,004,000 | 1,007,000
Accrued interest and other assets | 10,384,000 | 9,510,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 13,024,000 | 14,195,000
Gross unrealized gains for held to maturity | 13,000 | 9,000
Gross unrealized losses for held to maturity | 964,000 | 1,249,000
Investment securities, held to maturity, fair value | 12,073,000 | 12,955,000
U.S. Treasury |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 7,804,000 | 7,945,000
Investment securities available for sale, gross unrealized gains | 39,000 | 13,000
Investment securities available for sale, gross unrealized losses | 6,000 | 27,000
Investment securities available for sale, estimated fair value | 7,837,000 | 7,931,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 443,000 | 1,015,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 8,000 | 14,000
Investment securities, held to maturity, fair value | 435,000 | 1,001,000
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 4,708,000 | 3,739,000
Investment securities available for sale, gross unrealized gains | 63,000 | 8,000
Investment securities available for sale, gross unrealized losses | 4,000 | 45,000
Investment securities available for sale, estimated fair value | 4,767,000 | 3,702,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,019,000 | 2,034,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 94,000 | 157,000
Investment securities, held to maturity, fair value | 1,925,000 | 1,877,000
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 8,943,000 | 7,368,000
Investment securities available for sale, gross unrealized gains | 76,000 | 13,000
Investment securities available for sale, gross unrealized losses | 86,000 | 167,000
Investment securities available for sale, estimated fair value | 8,933,000 | 7,214,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 8,301,000 | 8,773,000
Gross unrealized gains for held to maturity | 2,000 | 0
Gross unrealized losses for held to maturity | 760,000 | 961,000
Investment securities, held to maturity, fair value | 7,543,000 | 7,812,000
Privately issued |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 34,000 | 37,000
Gross unrealized gains for held to maturity | 11,000 | 9,000
Gross unrealized losses for held to maturity | 0 | 0
Investment securities, held to maturity, fair value | 45,000 | 46,000
State and political subdivisions |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,226,000 | 2,335,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 102,000 | 117,000
Investment securities, held to maturity, fair value | 2,124,000 | 2,218,000
Other |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 3,000 | 2,000
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 0 | 0
Investment securities available for sale, estimated fair value | 3,000 | 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
Debt Securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Accrued interest and other assets | $ 190,000 | $ 176,000

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