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Investment Securities - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) securityLoan investmentSecurity	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) securityLoan investmentSecurity	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Investment Securities [Line Items]
Proceeds from the sale of investment securities	$ 24,200,000	$ 0	$ 24,200,000	$ 0
Gross realized losses from the sale of investment securities		$ 0		$ 0
Securities pledged as collateral	624,400,000		624,400,000		$ 595,800,000
Residential real estate mortgage-backed securities	1,500,000,000		$ 1,500,000,000
Life of mortgage-backed securities			6 years 6 months 14 days
Allowance for credit losses	0		$ 0		0
Obligations of U.S. government agencies
Investment Securities [Line Items]
Impairment losses recognized	0		0
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	265		265
Percentage of aggregate depreciation in unrealized losses	12.11%		12.11%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	172		172
Percentage of aggregate depreciation in unrealized losses	11.61%		11.61%
Corporate bonds
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 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	10.81%		10.81%
Asset backed securities
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0		0
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity	48		48
Percentage of aggregate depreciation in unrealized losses	2.38%		2.38%
Non-agency collateralized mortgage obligations
Investment Securities [Line Items]
Impairment losses recognized	$ 0		$ 0
Allowance for credit losses	$ 0		$ 0		$ 0
Number of available for sale securities in unrealized loss position (in investment securities) | securityLoan	21		21
Allowance for credit loss	$ 0		$ 0
Percentage of aggregate depreciation in unrealized losses	12.90%		12.90%

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Securities Pledged as Collateral

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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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Amount excluding accrued interest, 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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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

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Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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