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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net gain on sale $ 4,205 $ 932 $ 7,098 $ 1,696
Consumer Portfolio Segment [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Ancillary fees 824 320 1,225 581
Consumer Portfolio Segment [Member] | Residential Mortgage Loans Servicing Retained [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 89,687 39,465 161,778 56,813
Consumer Portfolio Segment [Member] | Residential        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 94,574 42,851 170,168 63,464
Net gain on sale 2,824 700 5,343 858
Fair value option adjustment $ 557 $ (88) $ 530 $ 257