Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]      
Residential mortgage loans sold with servicing retained $ 3,632,024 $ 3,322,723 $ 2,330,060
Pretax gains resulting from above loan sales $ 96,585 $ 83,148 $ 57,590