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Investment Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) investmentSecurity securityLoan	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) investmentSecurity securityLoan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Investment Securities [Line Items]
Proceeds from the sale of investment securities	$ 28,600,000	$ 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	691,878,000		691,878,000		$ 697,349,000
Securities pledged as collateral	755,000,000.0		755,000,000.0		$ 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 8 days
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	157		157
Percentage of aggregate depreciation in unrealized losses	14.01%		14.01%
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	155		155
Percentage of aggregate depreciation in unrealized losses	11.96%		11.96%
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	6		6
Percentage of aggregate depreciation in unrealized losses	5.94%		5.94%
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	18		18
Percentage of aggregate depreciation in unrealized losses	1.03%		1.03%
Non-agency collateralized mortgage obligations
Investment Securities [Line Items]
Number of available for sale securities in unrealized loss position (in investment securities) | securityLoan	19		19
Percentage of aggregate depreciation in unrealized losses	11.23%		11.23%

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