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Mortgage servicing rights
 12 Months Ended
Dec. 31, 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 years ended December 31, 2021, 2020, and 2019:
 Year Ended December 31,
 2021 2020 2019 
Carrying value at beginning of period$79,997 $75,521 $88,829 
Capitalization39,018 47,025 42,151 
Mortgage servicing rights acquired from Franklin, at fair
    value		— 5,111 — 
Sales— — (29,160)
Change in fair value:
    Due to pay-offs/pay-downs(30,583)(27,834)(16,350)
    Due to change in valuation inputs or assumptions27,080 (19,826)(9,949)
        Carrying value at end of period$115,512 $79,997 $75,521 

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 years ended December 31, 2021, 2020, and 2019: 
 Year Ended December 31,
 2021 2020 2019 
Servicing income:
   Servicing income$28,890 $22,128 $17,677 
   Change in fair value of mortgage servicing rights(3,503)(47,660)(26,299)
   Change in fair value of derivative hedging instruments(8,614)13,286 9,310 
Servicing income (loss)
16,773 (12,246)688 
Servicing expenses9,862 7,890 6,832 
          Net servicing income (loss)(1)
$6,911 $(20,136)$(6,144)
(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 December 31, 2021 and 2020 are as follows: 
 December 31,
 20212020
Unpaid principal balance$10,759,286 $9,787,657 
Weighted-average prepayment speed (CPR)9.31 %14.07 %
Estimated impact on fair value of a 10% increase$(4,905)$(4,493)
Estimated impact on fair value of a 20% increase$(9,429)$(8,599)
Discount rate9.81 %11.49 %
Estimated impact on fair value of a 100 bp increase$(4,785)$(2,942)
Estimated impact on fair value of a 200 bp increase$(9,198)$(5,674)
Weighted-average coupon interest rate3.23 %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 17, "Derivatives" for additional information on these hedging instruments.
As of December 31, 2021 and 2020, mortgage escrow deposits totaled to $127,617 and $147,957, respectively.