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MORTGAGE SERVICING RIGHTS (Tables)
 9 Months Ended
Sep. 30, 2019
Transfers and Servicing [Abstract]  
Presentation of Activity Related to MSR
The following table presents activity related to MSRs for the three and nine months ended September 30, 2019 and 2018:
 
 
Three Months Ended
 
Nine Months Ended
 
September 30, 2019
 
September 30, 2018
 
September 30, 2019
 
September 30, 2018
 
(dollars in thousands)
Fair value, beginning of period
$
425,328

 
$
599,014

 
$
557,813

 
$
580,860

Change in fair value due to:
 
 
 
 
 
 
 
Changes in valuation inputs or assumptions (1)
(17,312
)
 
(19,913
)
 
(116,150
)
 
(61,011
)
Other changes, including realization of expected cash flows
(21,965
)
 
9,732

 
(55,612
)
 
68,984

Fair value, end of period
$
386,051

 
$
588,833

 
$
386,051

 
$
588,833

 
(1)     Principally represents changes in discount rates and prepayment speed inputs used in valuation model, primarily due to changes in interest rates.