Quarterly report pursuant to Section 13 or 15(d)

LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details)

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method Key Assumptions (Details) - Amortization method - Residential Mortgage - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Servicing Asset at Amortized Cost [Line Items]    
Constant prepayment rate (annualized), actual 9.60% 11.10%
Constant prepayment rate (annualized), 10% adverse change $ (4,207) $ (5,543)
Constant prepayment rate (annualized), 20% adverse change $ (8,140) $ (10,648)
Spread over forward interest rate swap rates, actual 12.00% 9.00%
Spread over forward interest rate swap rates, 10% adverse change $ (3,800) $ (4,662)
Spread over forward interest rate swap rates, 20% adverse change $ (7,370) $ (9,017)