Securities - Additional Information (Detail) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |||
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Sep. 30, 2022
USD ($)
Security
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Sep. 30, 2021
USD ($)
|
Sep. 30, 2022
USD ($)
Security
|
Sep. 30, 2021
USD ($)
|
Dec. 31, 2021
USD ($)
Security
|
Jul. 31, 2022
USD ($)
$ / shares
|
|
Investments Debt And Equity Securities [Abstract] | ||||||
Fair value of pledged securities | $ 112,500,000 | $ 112,500,000 | $ 103,000,000.0 | |||
Restricted stock investment in FHLB stock | 2,900,000 | 2,900,000 | 4,100,000 | |||
Federal Home Loan Bank redemption of stock | $ 1,200,000 | |||||
Federal Home Loan Bank redemption par value per share | $ / shares | $ 100 | |||||
Federal Reserve Bank stock | 471,000 | 471,000 | $ 471,000 | |||
Proceeds from sale of available-for-sale securities | $ 0 | $ 0 | $ 0 | $ 0 | ||
Number of securities in an unrealized loss position, Total | Security | 203 | 203 | 66 | |||
Number of securities in continuous unrealized loss position, 12 months or more | Security | 61 | 11 |