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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2023
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 months ended March 31, 2023 and 2022:
 Three Months Ended March 31,
 2023 2022 
Carrying value at beginning of period$168,365 $115,512 
Capitalization1,788 9,812 
Change in fair value:
    Due to pay-offs/pay-downs(2,520)(4,471)
    Due to change in valuation inputs or assumptions(2,754)23,822 
        Carrying value at end of period$164,879 $144,675 
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 months ended March 31, 2023 and 2022: 
 Three Months Ended March 31,
 2023 2022 
Servicing income:
   Servicing income$7,768 $7,429 
   Change in fair value of mortgage servicing rights(5,274)19,351 
   Change in fair value of derivative hedging instruments1,867 (19,098)
Servicing income
4,361 7,682 
Servicing expenses1,883 2,548 
          Net servicing income
$2,478 $5,134 
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 March 31, 2023 and December 31, 2022 are as follows: 
 March 31,December 31,
 20232022
Unpaid principal balance$11,028,420 $11,086,582 
Weighted-average prepayment speed (CPR)5.96 %5.55 %
Estimated impact on fair value of a 10% increase$(5,017)$(4,886)
Estimated impact on fair value of a 20% increase$(9,695)$(9,447)
Discount rate8.97 %9.10 %
Estimated impact on fair value of a 100 bp increase$(7,924)$(8,087)
Estimated impact on fair value of a 200 bp increase$(15,163)$(15,475)
Weighted-average coupon interest rate3.35 %3.31 %
Weighted-average servicing fee (basis points)2727
Weighted-average remaining maturity (in months)333332