Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
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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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

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