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MORTGAGE SERVICING RIGHTS (Data and Assumptions Used in Fair Value Calculation) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
MORTGAGE SERVICING RIGHTS [Abstract]          
Unpaid principal balance $ 6,153,754 $ 5,802,407 $ 6,153,754 $ 5,802,407 $ 6,011,236
Weighted-average prepayment speed (CPR) 13.50% 10.00%     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) 321 months 316 months     319 months
Weighted-average servicing fee (basis points) 0.267% 0.266%     0.266%
Contractual servicing fees $ 4,200 $ 4,000 8,200 7,800  
Late and other ancillary fees $ 483 $ 314 $ 1,200 $ 662