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MORTGAGE SERVICING RIGHTS (Data and Assumptions Used in Fair Value Calculation) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
MORTGAGE SERVICING RIGHTS [Abstract]          
Unpaid principal balance $ 6,285,027 $ 5,942,736 $ 6,285,027 $ 5,942,736 $ 6,011,236
Weighted-average prepayment speed (CPR) 12.70% 11.10%     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) 322 months 317 months     319 months
Weighted-average servicing fee (basis points) 0.267% 0.266%     0.266%
Contractual servicing fees $ 4,300 $ 4,000 12,600 11,900  
Late and other ancillary fees $ 243 $ 320 $ 1,500 $ 982