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MORTGAGE SERVICING RIGHTS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Data and assumptions used in fair value calculation [Abstract]      
Unpaid principal balance $ 6,096,220 $ 5,705,638 $ 6,011,236
Weighted-average prepayment speed (CPR) 12.50% 12.40% 10.30%
Discount rate (annual percentage) (in hundredths) 9.80% 9.80% 9.80%
Weighted-average coupon interest rate (percentage) (in hundredths) 4.00% 4.10% 4.00%
Weighted-average remaining maturity (months) 320 months 315 months 319 months
Weighted-average servicing fee (basis points) 0.266% 0.265% 0.266%
Activity in mortgage servicing asset [Roll Forward]      
Fair value as of beginning of period $ 57,268 $ 51,296 $ 51,296
Origination of servicing assets 2,612 2,499  
Due to payoffs/paydowns (1,380) (1,564)  
Due to change in valuation inputs or assumptions used in the valuation model (7,954) (3,039)  
Other changes in fair value (2) (2)  
Fair value as of end of period 50,544 49,190 $ 57,268
Contractually specified servicing fees, late fees, and ancillary fees [Abstract]      
Contractual servicing fees 4,000 3,900  
Late and other ancillary fees $ 745 $ 348