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Investment Securities and Other Investments - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investments [Line Items]    
Securities available for sale, at fair value $ 321,081 $ 354,341
Federal home loan bank stock 12,300 14,700
Federal reserve bank stock 5,900 6,100
Correspondent bank stock 468 468
Other equity investments 12,900 23,800
Other investments 29,467 24,672
Asset Pledged as Collateral without Right [Member] | FHLB [Member]    
Schedule Of Investments [Line Items]    
Securities pledged 35,900 $ 241,900
Asset Pledged as Collateral without Right [Member] | BTFP [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