MORTGAGE SERVICING RIGHTS (Tables)

12 Months Ended

Dec. 31, 2014

MORTGAGE SERVICING RIGHTS [Abstract]

Data and Assumptions Used in Fair Value Calculation

	2014	2013	2012
	(Dollars in thousands)
Unpaid principal balance	$ 5,686,756	$ 5,577,325	$ 5,058,912
Weighted-average prepayment speed (CPR)	11.6	10.3	17.1
Discount rate (annual percentage)	9.8	10.3	10.8
Weighted-average coupon interest rate (percentage)	4.1	4.2	4.4
Weighted-average remaining maturity (months)	314.0	310.0	307.0
Weighted-average servicing fee (basis points)	26.5	26.6	27.1

Activity in Class of Mortgage Servicing Assets

		2014	2013
	(In thousands)
Fair value at beginning of year		$        54,662	$        37,882
Additions:
Origination of servicing assets		8,878	14,090
Changes in fair value:
Due to payoffs/paydowns		(5,793)	(6,244)
Due to change in valuation inputs or assumptions
used in the valuation model		(6,444)	8,943
Other changes in fair value		(7)	(9)
Fair value at end of year		$        51,296	$        54,662