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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Net gain on sale $ 2,893 $ 764
Consumer Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ancillary fees 401 261
Consumer Portfolio Segment [Member] | Residential Mortgage Loans Servicing Retained [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Proceeds from sale 72,091 17,348
Consumer Portfolio Segment [Member] | Residential Mortgage [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Proceeds from sale 75,594 20,613
Net gain on sale 2,519 158
Fair value option adjustment $ (27) $ 345