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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
MORTGAGE SERVICING RIGHTS [Abstract]          
Unpaid principal balance $ 6,506,550 $ 6,285,027 $ 6,506,550 $ 6,285,027 $ 6,384,649
Weighted-average prepayment speed (CPR) 9.40% 12.70%     9.40%
Discount rate (annual percentage) (in hundredths) 9.80% 9.80%     9.80%
Weighted-average coupon interest rate (percentage) (in hundredths) 4.00% 4.00%     3.90%
Weighted-average remaining maturity (months) 326 months 322 months     323 months
Weighted-average servicing fee (basis points) 0.267% 0.267%     0.267%
Contractual servicing fees $ 4,400 $ 4,300 13,100 12,600  
Late and other ancillary fees $ 206 $ 243 $ 1,000 $ 1,500