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Servicing Rights (Tables)
 6 Months Ended
Jun. 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 six-month periods ended June 30, 2022 and 2021:
Three Months Ended June 30,Six Months Ended June 30,
(In Thousands)2022202120222021
Balance, beginning of period$15,422 $11,657 $13,724 $11,218 
Additions for new MSR capitalized1,128 1,745 2,115 3,193 
Changes in fair value:
  Due to changes in model inputs of assumptions (1)
(225)16 967 (164)
  Other (2)
(24)(583)(505)(1,412)
Balance, end of period$16,301 $12,835 $16,301 $12,835 

(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 June 30, 2022 and December 31, 2021:
(In Thousands)June 30, 2022December 31, 2021
Balance of mortgage loans serviced for others$818,266 $772,764 
MSR as a percentage of serviced loans1.99 %1.78 %
The following table outlines the weighted average key assumptions used in measuring the fair value of MSR as of June 30, 2022 and December 31, 2021:
June 30, 2022December 31, 2021
Constant prepayment rate7.37 %11.80 %
Discount rate9.25 %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 June 30, 2022 and December 31, 2021 were as follows:
(In Thousands)June 30, 2022December 31, 2021
Aggregate portfolio principal balance$818,266 $772,764 
Weighted average rate of note3.28 %3.31 %
June 30, 2022Base1.0% Adverse Rate Change2.0% Adverse Rate Change
Constant prepayment rate7.37 %14.75 %22.12 %
Discount rate9.25 %8.25 %7.25 %
Fair value MSR$16,301 $12,424 $9,885 
Percentage of MSR1.99 %1.52 %1.21 %
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 %