Investment Securities - Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
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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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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