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MORTGAGE SERVICING RIGHTS (Tables)
9 Months Ended
Sep. 30, 2023
Transfers and Servicing [Abstract]  
Presentation of Activity Related to MSR
The following tables present activity related to MSR and Interests in MSR for the three and nine months ended September 30, 2023 and 2022:  
 Mortgage Servicing RightsThree Months EndedNine Months Ended
September 30, 2023September 30, 2022September 30, 2023September 30, 2022
 (dollars in thousands)
Fair value, beginning of period$2,018,896 $1,421,420 $1,748,209 $544,562 
Purchases (1)
185,299 182,784 399,450 866,767 
Transfers 82,650  82,650 
Sales —  (9,076)
Change in fair value due to:
Changes in valuation inputs or assumptions (2)
62,315 43,274 172,845 281,843 
Other changes, including realization of expected cash flows(31,697)(24,874)(85,691)(61,492)
Fair value, end of period$2,234,813 $1,705,254 $2,234,813 $1,705,254 
(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 MSRThree Months EndedNine Months Ended
September 30, 2022September 30, 2022
(dollars in thousands)
Beginning balance$83,622 $69,316 
Purchases (1)
— 4,860 
Transfers(82,650)(82,650)
Gain (loss) included in net income(972)8,474 
Ending balance$— $— 
(1) Includes adjustments to original purchase price from early payoffs, defaults, or loans that were delivered but were deemed to not be acceptable.