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Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2022
Transfers and Servicing [Abstract]  
Schedule of Servicing Assets at Fair Value
The following table details the activity in the Company's mortgage servicing rights ("MSR") for the three and nine-month periods ended September 30, 2022 and 2021:
Three Months Ended September 30,Nine Months Ended September 30,
(In Thousands)2022202120222021
Balance, beginning of period$16,301 $12,835 $13,724 $11,218 
Additions for new MSR capitalized1,263 1,703 3,378 4,896 
Changes in fair value:
  Due to changes in model inputs of assumptions (1)
555 (928)1,522 (1,092)
  Other (2)
(410)(530)(915)(1,942)
Balance, end of period$17,709 $13,080 $17,709 $13,080 

(1) Principally reflects changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates.
(2) Represents changes due to collection/realization of expected cash flows over time.

The following table details information related to our serviced mortgage loan portfolio as of September 30, 2022 and December 31, 2021:
(In Thousands)September 30, 2022December 31, 2021
Balance of mortgage loans serviced for others$859,288 $772,764 
MSR as a percentage of serviced loans2.06 %1.78 %
The following table outlines the weighted average key assumptions used in measuring the fair value of MSR as of September 30, 2022 and December 31, 2021:
September 30, 2022December 31, 2021
Constant prepayment rate7.27 %11.80 %
Discount rate10.00 %8.00 %
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets Key economic assumptions and the sensitivity of the current fair value for MSR to immediate adverse changes in those assumptions at September 30, 2022 and December 31, 2021 were as follows:
(In Thousands)September 30, 2022December 31, 2021
Aggregate portfolio principal balance$859,288 $772,764 
Weighted average rate of note3.36 %3.31 %
September 30, 2022Base1.0% Adverse Rate Change2.0% Adverse Rate Change
Constant prepayment rate7.27 %14.54 %21.82 %
Discount rate10.00 %9.00 %8.00 %
Fair value MSR$17,709 $14,009 $11,560 
Percentage of MSR2.06 %1.63 %1.35 %
December 31, 2021
Constant prepayment rate11.80 %23.59 %34.57 %
Discount rate8.00 %7.00 %6.00 %
Fair value MSR$13,724 $9,612 $7,256 
Percentage of MSR1.78 %1.24 %0.94 %