Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio (Details)

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio (Details) - Residential Mortgage - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Servicing Asset at Amortized Cost [Line Items]        
Loans sold with servicing retained $ 1,178,955 $ 1,204,547 $ 2,824,707 $ 2,552,602
Pretax gains resulting from above loan sales $ 26,880 $ 32,073 $ 66,014 $ 64,804