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Investment Securities - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) investmentSecurity securityLoan	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) investmentSecurity securityLoan	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Investment Securities [Line Items]
Proceeds from the sale of investment securities	$ 0	$ 0	$ 28,600,000	$ 24,200,000
Gross realized losses from the sale of investment securities			2,900,000	$ 200,000
Gain on common stock	693,176,000		693,176,000		$ 697,349,000
Securities pledged as collateral	761,600,000		761,600,000		$ 702,200,000
Residential real estate mortgage-backed securities	1,300,000,000		$ 1,300,000,000
Life of mortgage-backed securities			6 years 8 months 1 day
Visa Class C Common Stock
Investment Securities [Line Items]
Gain on common stock	2,900,000		$ 2,900,000
Obligations of U.S. government agencies
Investment Securities [Line Items]
Impairment losses recognized	0		0
Allowance for credit losses	$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	144		144
Percentage of aggregate depreciation in unrealized losses	10.79%		10.79%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	148		148
Percentage of aggregate depreciation in unrealized losses	8.66%		8.66%
Corporate bonds
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	5		5
Percentage of aggregate depreciation in unrealized losses	6.81%		6.81%
Asset backed securities
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	24		24
Percentage of aggregate depreciation in unrealized losses	0.69%		0.69%
Non-agency collateralized mortgage obligations
Investment Securities [Line Items]
Number of available for sale securities in unrealized loss position (in investment securities) | securityLoan	18		18
Percentage of aggregate depreciation in unrealized losses	9.94%		9.94%

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