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Transfers of Financial Assets (Loans sold) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Net gain on sale $ 2,421 $ 4,322 $ 8,038 $ 11,335
Residential Mortgage [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Proceeds from sale 88,691 128,268 262,029 298,840
Loans sold with servicing rights retained 79,690 115,822 239,357 273,827
Net gain on sale 1,979 3,324 4,356 6,749
Ancillary Fee Income Generated by Servicing Financial Assets, Amount 682 1,046 2,091 2,485
Fair value option adjustment $ (240) $ (48) $ 1,591 $ 2,101