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Residential Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Transfers and Servicing [Abstract]    
Schedule Of Changes In Mortgage Servicing Rights The following table presents the changes in the Company's residential mortgage servicing rights for the years ended December 31, 2020, 2019 and 2018: 
(in thousands) 202020192018
Balance, beginning of period$115,010 $169,025 $153,151 
Additions for new MSR capitalized51,000 25,169 29,069 
Sale of MSR assets— (34,401)— 
Changes in fair value:  
  Changes due to collection/realization of expected cash flows over time
(19,680)(25,408)(24,533)
  Changes due to valuation inputs or assumptions (1)
(53,423)(19,375)11,338 
Balance, end of period$92,907 $115,010 $169,025 
(1) The change in valuation inputs and assumptions principally reflect changes in discount rates and prepayment speeds, which are primarily affected by changes in interest rates.
  
Schedule Of Other Information Servicing Loan Portfolio  
Information related to the serviced loan portfolio as of December 31, 2020, 2019 and 2018 is as follows: 
(dollars in thousands)December 31, 2020December 31, 2019December 31, 2018
Balance of loans serviced for others$13,026,720 $12,276,943 $15,978,885 
MSR as a percentage of serviced loans0.71 %0.94 %1.06 %
Key Assumptions Used In Measuring The Fair Value of MSR
Key assumptions used in measuring the fair value of MSR as of December 31, 2020, 2019 and 2018 were as follows:
 December 31, 2020December 31, 2019December 31, 2018
Constant prepayment rate18.48 %13.33 %12.95 %
Discount rate9.72 %9.75 %9.70 %
Weighted average life (years)4.96.06.2
  
Sensitivity Analysis of Current Fair Value to Changes in Discount and Prepayment Speed Assumptions
A sensitivity analysis of the current fair value to changes in discount and prepayment speed assumptions as of December 31, 2020 and 2019 is as follows:
 December 31, 2020December 31, 2019
Constant prepayment rate
Effect on fair value of a 10% adverse change$(5,611)$(5,410)
Effect on fair value of a 20% adverse change$(10,833)$(10,403)
Discount rate
Effect on fair value of a 100 basis point adverse change$(3,339)$(4,366)
Effect on fair value of a 200 basis point adverse change$(6,448)$(8,418)