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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2024
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Investments [Line Items]      
Federal home loan bank stock   $ 11,300 $ 12,300
Federal reserve bank stock   9,200 5,900
Correspondent bank stock   468 468
Other equity investments   4,500 12,900
Securities available for sale, at fair value   314,784 321,081 [1]
Other Investments, Total   21,344 29,467 [1]
Sale of investment securities   6,400  
Realized loss on investment   (69)  
Impairment charge   8,500  
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   $ 273,000 35,900
Asset Pledged as Collateral without Right [Member] | Bank Term Funding Program Borrowings [Member]      
Schedule Of Investments [Line Items]      
Securities pledged     260,900
Debt securities, amortized cost     262,700
Securities available for sale, at fair value     $ 218,700
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.