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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net gain on sale $ 2,133 $ 1,305 $ 3,829 $ 3,684
Residential Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 66,236 57,042 129,700 147,105
Net gain on sale 1,652 1,051 2,510 2,732
Ancillary Fee Income Generated by Servicing Financial Assets, Amount 470 463 1,051 1,275
Fair value option adjustment 11 (209) 268 (323)
Residential Mortgage [Member] | Residential Mortgage Loans Servicing Retained [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale $ 60,493 $ 51,104 $ 117,306 $ 130,740