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Investment Securities - Additional Information (Detail)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Security
Securities
Mar. 31, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Security
Securities
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Security
Securities
Debt Securities, Available-for-Sale [Line Items]            
Allowance for credit losses on available for sale debt securities $ 0     $ 0    
Number of debt securities with unrealized losses | Securities 181     181   175
Held to maturity debt securities | Security 13     13   10
Proceeds from sales $ 0   $ 0 $ 1,847,000 $ 513,000  
Tax benefit (provision) 498,000   $ (3,000) 498,000 (3,000)  
Pledged debt securities with a carrying value 45,561,000     45,561,000   $ 47,418,000
Investment in subordinated notes $ 83,620,000     83,620,000   78,813,000
Loss incurred on sale of investment       $ (2,370,000) $ 13,000  
Subordinated notes [Member] | Corporate Debentures [Member]            
Debt Securities, Available-for-Sale [Line Items]            
Investment in subordinated notes           $ 3,000,000
Loss incurred on sale of investment   $ 2,445,000