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MORTGAGE SERVICING RIGHTS (Tables)
6 Months Ended
Jun. 30, 2021
Transfers and Servicing [Abstract]  
Presentation of Activity Related to MSR The following tables presents activity related to MSR and Interests in MSR for the three and six months ended June 30, 2021 and 2020:  
Three Months EndedSix Months Ended
 Mortgage Servicing RightsJune 30, 2021June 30, 2020June 30, 2021June 30, 2020
 (dollars in thousands)
Fair value, beginning of period$113,080 $280,558 $100,895 $378,078 
Purchases (1)
98,983 — 98,983 — 
Sales(376)— (376)— 
Change in fair value due to:
Changes in valuation inputs or assumptions (2)
4,621 (27,629)32,296 (106,854)
Other changes, including realization of expected cash flows(13,692)(25,529)(29,182)(43,824)
Fair value, end of period$202,616 $227,400 $202,616 $227,400 
(1) Includes adjustments to original purchase price from early payoffs, defaults, or loans that were delivered but were deemed to not be acceptable.
(2) Principally represents changes in discount rates and prepayment speed inputs used in valuation model, primarily due to changes in interest rates.

Interests in MSRSix Months Ended
June 30, 2021
(dollars in thousands)
Beginning balance$ 
Purchases (1)
47,098 
Gain (loss) included in net income1,937 
Ending balance June 30, 2021$49,035 
(1) Includes adjustments to original purchase price from early payoffs, defaults, or loans that were delivered but were deemed to not be acceptable.