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Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 97,425   97,425   106,201
Outstanding principal balance of residential mortgage loans serviced for others $ 14,907,736,000   $ 14,907,736,000   $ 16,228,449,000
Weighted average interest rate 3.68%   3.68%   3.84%
Remaining term (in months)     278 months   280 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 117,629,000 $ 97,971,000 $ 101,172,000 $ 201,886,000 $ 201,886,000
Additions 11,540,000 7,424,000 29,307,000 21,330,000  
Disposals 0 0 0 (10,801,000)  
Change in fair value due to principal payments (8,806,000) (11,192,000) (30,949,000) (28,971,000)  
Change in fair value due to market assumption changes 12,945,000 3,441,000 33,778,000 (85,800,000)  
Ending balance $ 133,308,000 $ 97,644,000 $ 133,308,000 $ 97,644,000 $ 101,172,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]          
Discount rate - risk-free rate plus a market premium (in hundredths)     8.46%   9.14%
Prepayment rate - based upon loan interest rate, original term and loan type     13.57%   19.73%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)     $ 69   $ 69
Loan servicing costs - annually per loan based upon loan type, performing, maximum (in dollars per loan)     85   94
Loan servicing costs - annually per loan based upon loan type, delinquent, minimum (in dollars per loan)     150   150
Loan servicing costs - annually per loan based upon loan type, delinquent, maximum (in dollars per loan)     500   500
Loan servicing costs - annually per loan based upon loan type, foreclosure, minimum (in dollars per loan)     1,000   1,000
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)     $ 4,000   $ 4,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)     1.08%   0.43%
Primary secondary mortgage rate spread 105   105   105
Delinquency rate     2.36%   3.54%