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Borrowed Funds - Scheduled Securities Sold Under Repurchase Agreements (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Due after three years through four years $ 0  
Due after four years through five years 0  
Securities sold under repurchase agreements 99,936 $ 60,737
Securities Sold Under Repurchase Agreements    
Debt Instrument [Line Items]    
Due in one year or less 99,936  
Due after one year through two years 0  
Due after two years through three years 0  
Thereafter 0  
Securities sold under repurchase agreements $ 99,936