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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]      
Securities available for sale, at fair value   $ 312,035 $ 321,081
Federal home loan bank stock   9,400 12,300
Federal reserve bank stock   9,400 5,900
Correspondent bank stock   468 468
Unrealized gain position   1,100 4,400
Other equity investments   4,800 12,900
Impairment charge $ 8,500 8,500  
Other Investments, Total   19,405 29,467
Sale of investment securities   11,900  
Realized gain on investment   139  
Federal Reserve Board Bank Term Funding Program [Member]      
Schedule Of Investments [Line Items]      
Securities available for sale, at fair value   16,300  
Debt securities, amortized cost   18,100  
Borrowings available through discount window   105,700 161,000
Advance from federal reserve bank   0 0
Bank Term Funding Program Borrowings [Member] | Collateralized Securities [Member]      
Schedule Of Investments [Line Items]      
Repaid principal amount $ 65,000    
Asset Pledged as Collateral without Right [Member] | FHLB [Member]      
Schedule Of Investments [Line Items]      
Securities pledged   268,900 35,900
Asset Pledged as Collateral without Right [Member] | Bank Term Funding Program Borrowings [Member]      
Schedule Of Investments [Line Items]      
Securities available for sale, at fair value     218,700
Debt securities, amortized cost     262,700
Securities pledged     260,900
Asset Pledged as Collateral without Right [Member] | FRB [Member]      
Schedule Of Investments [Line Items]      
Securities pledged   16,300 0
Third Party Investment Grade [Member]      
Schedule Of Investments [Line Items]      
Securities pledged   $ 29,300 $ 20,500