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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net gain on sale $ 932 $ 1,235 $ 1,696 $ 2,379
Residential Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 42,851 45,257 63,464 90,063
Net gain on sale 700 598 858 1,681
Ancillary Fee Income Generated by Servicing Financial Assets, Amount 320 402 581 812
Fair value option adjustment (88) 235 257 (114)
Residential Mortgage [Member] | Residential Mortgage Loans Servicing Retained [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale $ 39,465 $ 39,822 $ 56,813 $ 79,726