(1)	Principally reflects changes in annual total prepayment speed, pricing spread, per loan annual cost of servicing and UPB of underlying loan inputs.

(2)	Represents changes due to realization of cash flows.

Mortgage Servicing Liabilities at Fair Value

The activity in MSLs is summarized below:


	Quarter ended March 31,
	2023		2022

	(in thousands)
Balance at beginning of quarter	$	2,096	$	2,816
Changes in fair value due to:
Changes in inputs used in valuation model		(15)		(138)
Other changes in fair value (1)		(70)		(114)
Total change in fair value		(85)		(252)
Balance at end of quarter	$	2,011	$	2,564
Unpaid principal balance of underlying loans at end of quarter	$	28,380	$	37,450

(1)	Represents changes due to realization of cash flows.

Contractual servicing fees relating to MSRs and MSLs are recorded in Net loan servicing fees—Loan servicing fees—From non-affiliates on the consolidated statements of income; other fees relating to MSRs and MSLs are recorded in Net loan servicing fees—Loan servicing fees—Other on the Company’s consolidated statements of income. Such amounts are summarized below:


	Quarter ended March 31,
	2023		2022

	(in thousands)
Contractual servicing fees	$	290,697	$	244,809
Other fees:
Late charges		12,601		10,117
Other		2,181		4,994
	$	305,479	$	259,920