MORTGAGE SERVICING RIGHTS (Tables)

12 Months Ended

Dec. 31, 2015

MORTGAGE SERVICING RIGHTS [Abstract]

Data and Assumptions Used in Fair Value Calculation

	2015	2014	2013
	(Dollars in thousands)
Unpaid principal balance	$6,011,236	$5,686,756	$5,577,325
Weighted-average prepayment speed (CPR)	10.3	11.6	10.3
Discount rate (annual percentage)	9.8	9.8	10.3
Weighted-average coupon interest rate (percentage)	4.0	4.1	4.2
Weighted-average remaining maturity (months)	319.0	314.0	310.0
Weighted-average servicing fee (basis points)	26.6	26.5	26.6

Activity in Class of Mortgage Servicing Assets

		2015	2014
	(In thousands)
Fair value at beginning of year		$        51,296	$        54,662
Additions:
Origination of servicing assets		14,139	8,878
Changes in fair value:
Due to payoffs/paydowns		(6,999)	(5,793)
Due to change in valuation inputs or assumptions
used in the valuation model		(1,161)	(6,444)
Other changes in fair value		(7)	(7)
Fair value at end of year		$        57,268	$        51,296