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MORTGAGE SERVICING RIGHTS (Tables)
 6 Months Ended
Jun. 30, 2018
Transfers and Servicing [Abstract]  
Presentation of Activity Related to MSR
The following table presents activity related to MSRs for the three and six months ended June 30, 2018 and 2017:
 
Three Months Ended
 
Six Months Ended
 
June 30, 2018
 
June 30, 2017
 
June 30, 2018
 
June 30, 2017
 
(dollars in thousands)
Fair value, beginning of period
$
596,378

 
$
632,166

 
$
580,860

 
$
652,216

Purchases (1)
—

 
(210
)
 
—

 
3

Change in fair value due to:
 

 
 
 
 

 
 
  Changes in valuation inputs or assumptions (2)
22,578

 
(9,205
)
 
59,252

 
(15,438
)
  Other changes, including realization of expected cash flows
(19,942
)
 
(17,098
)
 
(41,098
)
 
(31,128
)
Fair value, end of period
$
599,014

 
$
605,653

 
$
599,014

 
$
605,653


(1)
Includes adjustments to original purchase price from early payoffs, defaults, or loans that were delivered but were deemed to be not acceptable.
(2)
Principally represents changes in discount rates and prepayment speed inputs used in valuation model, primarily due to changes in interest rates.