Quarterly report pursuant to Section 13 or 15(d)

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

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LOAN SALES AND SECURITIZATIONS - Residential Mortgage Portfolio, MSRs Amortization Method (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Fair value, end of period $ 180,938   $ 180,938   $ 189,237
Residential Mortgage          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Carrying value, beginning of period 121,292 $ 143,127 143,133 $ 132,813  
New servicing assets created 12,434 9,918 25,820 26,710  
Servicing assets acquired 15,317 0 15,317 0  
Impairment (charge) / recovery 2,543 (12,472) (21,093) (7,492)  
Amortization and other (7,194) (5,106) (18,785) (16,564)  
Carrying value, end of period 144,392 135,467 144,392 135,467  
Fair value, end of period $ 144,623 $ 135,499 $ 144,623 $ 135,499  
Residential Mortgage | Amortization method          
Servicing Asset at Amortized Cost, Balance [Roll Forward]          
Weighted-average life (years) 6 years 1 month 6 years 6 years 1 month 6 years