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Borrowed Funds - Scheduled FHLB Advances (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Due in one year or less $ 347,623  
Due after one year through two years 58,589  
Due after two years through three years 22,899  
Due after three years through four years 74,260  
Due after four years through five years 0  
Thereafter 0  
Total FHLB advances $ 503,371 $ 1,051,036