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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2022
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of Changes in Mortgage Servicing Rights
Changes in the Company’s mortgage servicing rights were as follows for the three and nine months ended September 30, 2022 and 2021:
 Three Months Ended September 30,Nine Months Ended September 30,
 202220212022 2021 
Carrying value at beginning of period$158,678 $101,615 $115,512 $79,997 
Capitalization4,453 9,215 19,523 31,382 
Change in fair value:
    Due to pay-offs/pay-downs(3,670)(7,302)(13,165)(24,488)
    Due to change in valuation inputs or assumptions11,966 7,063 49,557 23,700 
        Carrying value at end of period$171,427 $110,591 $171,427 $110,591 
Schedule of Servicing Income and Expense Included in Mortgage Banking Income
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, 2022 and 2021: 
 Three Months Ended September 30,Nine Months Ended September 30,
 202220212022 2021 
Servicing income:
   Servicing income$8,104 $7,539 $23,499 $21,258 
   Change in fair value of mortgage servicing rights8,296 (239)36,392 (788)
   Change in fair value of derivative hedging instruments(12,641)(2,128)(41,636)(9,987)
Servicing income
3,759 5,172 18,255 10,483 
Servicing expenses1,923 2,156 7,848 7,381 
          Net servicing income(1)
$1,836 $3,016 $10,407 $3,102 
(1) Excludes benefit of custodial servicing related noninterest-bearing deposits held by the Bank.
Schedule of Data and Key Economic Assumptions Related to Mortgage Servicing Rights
Data and key economic assumptions related to the Company’s mortgage servicing rights as of September 30, 2022 and December 31, 2021 are as follows: 
 September 30,December 31,
 20222021
Unpaid principal balance$11,233,249 $10,759,286 
Weighted-average prepayment speed (CPR)5.40 %9.31 %
Estimated impact on fair value of a 10% increase$(4,751)$(4,905)
Estimated impact on fair value of a 20% increase$(9,191)$(9,429)
Discount rate9.6 %9.81 %
Estimated impact on fair value of a 100 bp increase$(8,164)$(4,785)
Estimated impact on fair value of a 200 bp increase$(15,623)$(9,198)
Weighted-average coupon interest rate3.29 %3.23 %
Weighted-average servicing fee (basis points)2727
Weighted-average remaining maturity (in months)331330