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Investment Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2025 USD ($) investmentSecurity securityLoan	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Investment Securities [Line Items]
Proceeds from the sale of investment securities	$ 30,000,000.0	$ 0
Gross realized losses from the sale of investment securities	1,100,000	$ 0
Securities pledged as collateral	919,200,000		$ 716,000,000.0
Residential real estate mortgage-backed securities	$ 1,200,000,000
Life of mortgage-backed securities	6 years 7 months 9 days
Obligations of U.S. government agencies
Investment Securities [Line Items]
Impairment losses recognized	$ 0
Allowance for credit losses	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	143
Percentage of aggregate depreciation in unrealized losses	12.30%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Impairment losses recognized	$ 0
Allowance for credit losses	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	150
Percentage of aggregate depreciation in unrealized losses	11.80%
Corporate bonds
Investment Securities [Line Items]
Allowance for credit loss	$ 0		$ 0
Impairment losses recognized	0
Allowance for credit losses	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	5
Percentage of aggregate depreciation in unrealized losses	4.60%
Asset backed securities
Investment Securities [Line Items]
Impairment losses recognized	$ 0
Allowance for credit losses	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	23
Percentage of aggregate depreciation in unrealized losses	1.00%
Non-agency collateralized mortgage obligations
Investment Securities [Line Items]
Allowance for credit losses	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | securityLoan	17
Percentage of aggregate depreciation in unrealized losses	10.40%

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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