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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]    
Securities available for sale, at fair value $ 314,394 $ 321,081 [1]
Federal home loan bank stock 15,600 12,300
Federal reserve bank stock 6,000 5,900
Correspondent bank stock 468 468
Other equity investments 12,900 12,900
Other Investments, Total 26,586 29,467 [1]
Asset Pledged as Collateral without Right [Member] | FHLB [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 213,200 $ 35,900
Asset Pledged as Collateral without Right [Member] | BTFP [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 69,000  
Debt securities, amortized cost 69,700  
Securities available for sale, at fair value $ 56,100  
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.