MORTGAGE SERVICING RIGHTS (Tables)

3 Months Ended

Mar. 31, 2017

MORTGAGE SERVICING RIGHTS [Abstract]

Data and Assumptions Used in Fair Value Calculation

	March 31,		December 31,
	2017	2016	2016
	(Dollars in thousands)
Unpaid principal balance	$6,429,617	$6,096,220	$6,384,649
Weighted-average prepayment speed (CPR)	9.2	12.5	9.4
Discount rate (annual percentage)	9.8	9.8	9.8
Weighted-average coupon interest rate (percentage)	3.9	4.0	3.9
Weighted-average remaining maturity (months)	323.0	320.0	323.0
Weighted-average servicing fee (basis points)	26.6	26.6	26.7

Activity in Class of Mortgage Servicing Assets

	2017	2016
	(In thousands)
Fair value as of January 1	$        65,263	$         57,268
Additions:
Origination of servicing assets	2,866	2,612
Changes in fair value:
Due to payoffs/paydowns	(1,876)	(1,380)
Due to change in valuation inputs or assumptions
used in the valuation model	909	(7,954)
Other changes in fair value	(1)	(2)
Fair value as of March 31	$        67,161	$         50,544