Investment Securities - Additional Information (Detail)	9 Months Ended
Sep. 30, 2021 USD ($) investmentSecurity	Dec. 31, 2020 USD ($)
Investment Securities [Line Items]
Securities pledged as collateral	$ 440,177,000	$ 429,049,000
Residential real estate mortgage-backed securities	$ 1,196,924,000,000
Life of mortgage-backed securities	4 years 2 months 26 days
Impairment losses recognized	$ 0
Allowance for Credit Losses	0	0
Obligations of U.S. government agencies
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	40
Percentage of aggregate depreciation in unrealized losses	1.01%
Obligations of states and political subdivisions
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	31
Percentage of aggregate depreciation in unrealized losses	2.02%
Asset backed securities
Investment Securities [Line Items]
Allowance for Credit Losses	$ 0	$ 0
Number of available for sale securities in unrealized loss position (in investment securities) \| investmentSecurity	26
Percentage of aggregate depreciation in unrealized losses	0.62%

Investment Securities [Line Items]

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Life of mortgage backed securities.

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Percentage of aggregate depreciation in unrealized losses.

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- Definition

Securities Pledged as Collateral

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No definition available.

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- Definition

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).

+ References

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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 cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

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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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