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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]    
Securities available for sale, at fair value $ 340,617 $ 354,341 [1]
Federal home loan bank stock 10,900 14,700
Federal reserve bank stock 6,100 6,100
Correspondent bank stock 468 468
Other equity investments 22,700 23,800
Asset Pledged as Collateral without Right [Member] | FHLB [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 178,800 241,900
Asset Pledged as Collateral without Right [Member] | BTFP [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 108,700  
Debt securities, amortized cost 109,600  
Securities available for sale, at fair value 90,000  
Asset Pledged as Collateral without Right [Member] | FRB [Member]    
Schedule Of Investments [Line Items]    
Securities pledged $ 11,600 $ 0
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.