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Mortgage Servicing Rights
 12 Months Ended
Dec. 31, 2021
Transfers and Servicing [Abstract]  
Mortgage Servicing Rights Mortgage Servicing Rights
The unpaid principal loan balance of our servicing portfolio is presented in the following table as of December 31,:
20212020
Federal National Mortgage Association$2,352,981 $2,117,703 
Federal Home Loan Mortgage Corporation1,512,858 948,934 
Government National Mortgage Association759,524 722,138 
Federal Home Loan Bank134,616 245,246 
Other1,853 2,144 
Total$4,761,832 $4,036,165 
The activity of MSRs carried at fair value is as follows for the years ended December 31,:
202120202019
Balance, beginning of year$29,144 $29,003 $26,188 
Additions:
Servicing resulting from transfers of financial assets23,854 22,421 14,745 
Changes in fair value:
Due to changes in valuation inputs or assumptions used in the valuation model6,093 (13,798)(5,977)
Changes in fair value due to pay-offs, pay-downs, and runoff(11,699)(8,482)(5,953)
Balance, end of year$47,392 $29,144 $29,003 
The following represents the weighted-average key assumptions used to estimate the fair value of MSRs as of December 31,:
202120202019
Discount rate9.22 %9.12 %9.29 %
Total prepayment speeds11.52 %16.99 %13.01 %
Cost of servicing each loan
$85/per loan
$85/per loan
$86/per loan
Total servicing and ancillary fees earned from the mortgage servicing portfolio is presented in the following table for the years ended December 31,:
202120202019
Servicing fees$12,092 $9,426 $7,385 
Late and ancillary fees433 372 415 
Total$12,525 $9,798 $7,800