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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | $ 16,658,000 | $ 10,691,000
Investment securities available for sale, gross unrealized gains | 177,000 | 0
Investment securities available for sale, gross unrealized losses | 108,000 | 251,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023) | 16,727,000 | 10,440,000
Total debt securities Amortized cost | 31,161,000 | 26,021,000
Total debt securities Gross unrealized gains | 198,000 | 13,000
Total debt securities Gross unrealized losses | 923,000 | 1,286,000
Total debt securities Estimated fair value | 30,436,000 | 24,748,000
Readily marketable securities Amortized cost | 250,000 | 266,000
Readily marketable securities Gross unrealized gains | 9,000 | 5,000
Readily marketable securities Gross unrealized losses | 2,000 | 3,000
Readily marketable securities Estimated fair value | 257,000 | 268,000
Other securities, Amortized cost | 840,000 | 859,000
Other securities, Estimated fair value | 840,000 | 859,000
Equity and other securities, cost | 1,090,000 | 1,125,000
Equity securities, Gross Unrealized Gains | 9,000 | 5,000
Equity securities, Gross Unrealized Losses | 2,000 | 3,000
Equity and other securities (cost: $1,090 at September 30, 2024; $1,125 at December 31, 2023) | 1,097,000 | 1,127,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 14,503,000 | 15,330,000
Gross unrealized gains for held to maturity | 21,000 | 13,000
Gross unrealized losses for held to maturity | 815,000 | 1,035,000
Investment securities, held to maturity, fair value | 13,709,000 | 14,308,000
U.S. Treasury and federal agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 7,824,000 | 7,818,000
Investment securities available for sale, gross unrealized gains | 62,000 | 0
Investment securities available for sale, gross unrealized losses | 26,000 | 113,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023) | 7,860,000 | 7,705,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 1,013,000 | 1,005,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 14,000 | 31,000
Investment securities, held to maturity, fair value | 999,000 | 974,000
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 3,125,000 | 425,000
Investment securities available for sale, gross unrealized gains | 55,000 | 0
Investment securities available for sale, gross unrealized losses | 3,000 | 9,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023) | 3,177,000 | 416,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,038,000 | 2,033,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 81,000 | 130,000
Investment securities, held to maturity, fair value | 1,957,000 | 1,903,000
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 5,606,000 | 2,272,000
Investment securities available for sale, gross unrealized gains | 60,000 | 0
Investment securities available for sale, gross unrealized losses | 77,000 | 118,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023) | 5,589,000 | 2,154,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 9,016,000 | 9,747,000
Gross unrealized gains for held to maturity | 13,000 | 4,000
Gross unrealized losses for held to maturity | 646,000 | 802,000
Investment securities, held to maturity, fair value | 8,383,000 | 8,949,000
Other debt securities |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 103,000 | 176,000
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 2,000 | 11,000
Available for sale (cost: $16,658 at September 30, 2024; $10,691 at December 31, 2023) | 101,000 | 165,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 1,000 | 2,000
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 | 2,000
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,397,000 | 2,501,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 71,000 | 67,000
Investment securities, held to maturity, fair value | 2,326,000 | 2,434,000
Privately issued |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 38,000 | 42,000
Gross unrealized gains for held to maturity | 8,000 | 9,000
Gross unrealized losses for held to maturity | 3,000 | 5,000
Investment securities, held to maturity, fair value | $ 43,000 | $ 46,000

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