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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net gain on sale $ 7,087 $ 2,133 $ 14,185 $ 3,829
Consumer Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Ancillary fees 1,018 470 2,243 1,051
Consumer Portfolio Segment [Member] | Residential Mortgage Loans Servicing Retained [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 164,054 60,493 325,832 117,306
Consumer Portfolio Segment [Member] | Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 172,579 66,236 342,747 129,700
Net gain on sale 6,244 1,652 11,587 2,510
Fair value option adjustment $ (175) $ 11 $ 355 $ 268