Investment securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	$ 25,219,000	$ 22,994,000
Investment securities available for sale, gross unrealized gains	155,000	270,000
Investment securities available for sale, gross unrealized losses	146,000	62,000
Investment securities available for sale, estimated fair value	25,228,000	23,202,000
Total debt securities amortized cost	37,338,000	35,424,000
Total debt securities gross unrealized gains	170,000	292,000
Total debt securities gross unrealized losses	925,000	799,000
Total debt securities estimated fair value	36,583,000	34,917,000
Readily marketable securities amortized cost	280,000	280,000
Readily marketable securities gross unrealized gains	3,000	3,000
Readily marketable securities gross unrealized losses	2,000	2,000
Readily marketable securities estimated fair value	281,000	281,000
Other securities, amortized cost	993,000	736,000
Other securities, estimated fair value	993,000	736,000
Equity and other securities, cost	1,273,000	1,016,000
Equity securities, gross unrealized gains	3,000	3,000
Equity securities, gross unrealized losses	2,000	2,000
Equity and other securities, estimated fair value	1,274,000	1,017,000
Accrued interest and other assets	11,661,000	11,251,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	12,119,000	12,430,000
Gross unrealized gains for held to maturity	15,000	22,000
Gross unrealized losses for held to maturity	779,000	737,000
Investment securities, held to maturity, fair value	11,355,000	11,715,000
U.S. Treasury
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	3,226,000	6,302,000
Investment securities available for sale, gross unrealized gains	14,000	43,000
Investment securities available for sale, gross unrealized losses	0	2,000
Investment securities available for sale, estimated fair value	3,240,000	6,343,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	397,000	445,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	4,000	4,000
Investment securities, held to maturity, fair value	393,000	441,000
Commercial
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	4,735,000	4,738,000
Investment securities available for sale, gross unrealized gains	50,000	79,000
Investment securities available for sale, gross unrealized losses	3,000	1,000
Investment securities available for sale, estimated fair value	4,782,000	4,816,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	1,996,000	2,007,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	78,000	74,000
Investment securities, held to maturity, fair value	1,918,000	1,933,000
Residential
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	17,257,000	11,953,000
Investment securities available for sale, gross unrealized gains	91,000	148,000
Investment securities available for sale, gross unrealized losses	143,000	59,000
Investment securities available for sale, estimated fair value	17,205,000	12,042,000
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	7,610,000	7,816,000
Gross unrealized gains for held to maturity	4,000	10,000
Gross unrealized losses for held to maturity	633,000	619,000
Investment securities, held to maturity, fair value	6,981,000	7,207,000
Privately issued
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	30,000	32,000
Gross unrealized gains for held to maturity	11,000	12,000
Gross unrealized losses for held to maturity	0	0
Investment securities, held to maturity, fair value	41,000	44,000
State and political subdivisions
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss [Abstract]
Amortized cost for held to maturity	2,085,000	2,129,000
Gross unrealized gains for held to maturity	0	0
Gross unrealized losses for held to maturity	64,000	40,000
Investment securities, held to maturity, fair value	2,021,000	2,089,000
Other
Debt Securities, Available-for-Sale [Line Items]
Investment securities available for sale, amortized cost	1,000	1,000
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	1,000	1,000
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	$ 163,000	$ 187,000

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