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Mortgage servicing rights
 9 Months Ended
Sep. 30, 2021
Transfers and Servicing of Financial Assets [Abstract]  
Mortgage servicing rights Mortgage servicing rights:
Changes in the Company’s mortgage servicing rights were as follows for the three and nine months ended September 30, 2021 and 2020:
 Three Months Ended September 30,Nine Months Ended September 30,
 2021 2020 2021 2020 
Carrying value at beginning of period$101,615 $60,508 $79,997 $75,521 
Capitalization9,215 18,202 31,382 33,415 
Mortgage servicing rights acquired from Franklin, at fair
    value		— 4,850 — 4,850 
Change in fair value:
    Due to pay-offs/pay-downs(7,302)(7,756)(24,488)(19,676)
    Due to change in valuation inputs or assumptions7,063 581 23,700 (22,575)
        Carrying value at end of period$110,591 $71,535 $110,591 $71,535 

The following table summarizes servicing income and expense, which are included in 'Mortgage banking income' and 'Other noninterest expense', respectively, within the Mortgage segment operating results for the three and nine months ended September 30, 2021 and 2020: 
 Three Months Ended September 30,Nine Months Ended September 30,
 2021 2020 2021 2020 
Servicing income:
   Servicing income$7,539 $5,536 $21,258 $15,667 
   Change in fair value of mortgage servicing rights(239)(7,175)(788)(42,251)
   Change in fair value of derivative hedging instruments(2,128)(265)(9,987)15,705 
Servicing income (loss)
5,172 (1,904)10,483 (10,879)
Servicing expenses2,156 1,999 7,381 5,392 
          Net servicing income (loss)(1)
$3,016 $(3,903)$3,102 $(16,271)
(1) Excludes benefit of custodial servicing related noninterest-bearing deposits held by the Bank.
Data and key economic assumptions related to the Company’s mortgage servicing rights as of September 30, 2021 and December 31, 2020 are as follows: 
 September 30,December 31,
 20212020
Unpaid principal balance$10,633,805 $9,787,657 
Weighted-average prepayment speed (CPR)9.46 %14.07 %
Estimated impact on fair value of a 10% increase$(4,737)$(4,493)
Estimated impact on fair value of a 20% increase$(9,107)$(8,599)
Discount rate11.56 %11.49 %
Estimated impact on fair value of a 100 bp increase$(4,454)$(2,942)
Estimated impact on fair value of a 200 bp increase$(8,571)$(5,674)
Weighted-average coupon interest rate3.29 %3.58 %
Weighted-average servicing fee (basis points)2728
Weighted-average remaining maturity (in months)330328
The Company hedges the mortgage servicing rights portfolio with various derivative instruments to offset changes in the fair value of the related mortgage servicing rights. See Note 10, "Derivatives" for additional information on these hedging instruments.
As of September 30, 2021 and December 31, 2020, mortgage escrow deposits totaled to $190,631 and $147,957, respectively.