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Borrowed Funds - Scheduled FHLB Advances (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Due in one year or less $ 754,481  
Due after one year through two years 168,686  
Due after two years through three years 58,650  
Due after three years through four years 19,219  
Thereafter 0  
Total FHLB advances $ 1,051,036 $ 766,409