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Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | $ 14,131,000 | $ 10,691,000
Investment securities available for sale, gross unrealized gains | 12,000 | 0
Investment securities available for sale, gross unrealized losses | 251,000 | 251,000
Available for sale (cost: $14,131 at June 30, 2024; $10,691 at December 31, 2023) | 13,892,000 | 10,440,000
Total debt securities Amortized cost | 28,924,000 | 26,021,000
Total debt securities Gross unrealized gains | 19,000 | 13,000
Total debt securities Gross unrealized losses | 1,542,000 | 1,286,000
Total debt securities Estimated fair value | 27,401,000 | 24,748,000
Readily marketable securities Amortized cost | 272,000 | 266,000
Readily marketable securities Gross unrealized gains | 11,000 | 5,000
Readily marketable securities Gross unrealized losses | 3,000 | 3,000
Readily marketable securities Estimated fair value | 280,000 | 268,000
Other securities, Amortized cost | 929,000 | 859,000
Other securities, Estimated fair value | 929,000 | 859,000
Equity and other securities, cost | 1,201,000 | 1,125,000
Equity securities, Gross Unrealized Gains | 11,000 | 5,000
Equity securities, Gross Unrealized Losses | 3,000 | 3,000
Equity and other securities (cost: $1,201 at June 30, 2024; $1,125 at December 31, 2023) | 1,209,000 | 1,127,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 14,793,000 | 15,330,000
Gross unrealized gains for held to maturity | 7,000 | 13,000
Gross unrealized losses for held to maturity | 1,291,000 | 1,035,000
Investment securities, held to maturity, fair value | 13,509,000 | 14,308,000
U.S. Treasury and federal agencies |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 7,819,000 | 7,818,000
Investment securities available for sale, gross unrealized gains | 2,000 | 0
Investment securities available for sale, gross unrealized losses | 85,000 | 113,000
Available for sale (cost: $14,131 at June 30, 2024; $10,691 at December 31, 2023) | 7,736,000 | 7,705,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 1,010,000 | 1,005,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 30,000 | 31,000
Investment securities, held to maturity, fair value | 980,000 | 974,000
Commercial |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 2,101,000 | 425,000
Investment securities available for sale, gross unrealized gains | 4,000 | 0
Investment securities available for sale, gross unrealized losses | 16,000 | 9,000
Available for sale (cost: $14,131 at June 30, 2024; $10,691 at December 31, 2023) | 2,089,000 | 416,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 2,037,000 | 2,033,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 157,000 | 130,000
Investment securities, held to maturity, fair value | 1,880,000 | 1,903,000
Residential |  |
Debt Securities, Available-for-Sale [Line Items] |  |
Investment securities available for sale, amortized cost | 4,108,000 | 2,272,000
Investment securities available for sale, gross unrealized gains | 6,000 | 0
Investment securities available for sale, gross unrealized losses | 148,000 | 118,000
Available for sale (cost: $14,131 at June 30, 2024; $10,691 at December 31, 2023) | 3,966,000 | 2,154,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 9,272,000 | 9,747,000
Gross unrealized gains for held to maturity | 0 | 4,000
Gross unrealized losses for held to maturity | 972,000 | 802,000
Investment securities, held to maturity, fair value | 8,300,000 | 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: $14,131 at June 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 | 2,433,000 | 2,501,000
Gross unrealized gains for held to maturity | 0 | 0
Gross unrealized losses for held to maturity | 127,000 | 67,000
Investment securities, held to maturity, fair value | 2,306,000 | 2,434,000
Privately issued |  |
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract] |  |
Amortized cost for held to maturity | 40,000 | 42,000
Gross unrealized gains for held to maturity | 7,000 | 9,000
Gross unrealized losses for held to maturity | 5,000 | 5,000
Investment securities, held to maturity, fair value | $ 42,000 | $ 46,000

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