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Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 116,941   116,941   110,541
Outstanding principal balance of residential mortgage loans serviced for others $ 20,607,013,000   $ 20,607,013,000   $ 18,863,201,000
Weighted average interest rate 3.61%   3.61%   3.59%
Remaining term (in months)     282 months   283 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 304,722,000 $ 270,312,000 $ 277,608,000 $ 163,198,000 $ 163,198,000
Additions 3,154,000 4,841,000 9,757,000 15,810,000  
Acquisitions 2,669,000 1,043,000 33,807,000 45,910,000  
Changes due to principal payments (7,202,000) (8,960,000) (21,031,000) (24,277,000)  
Change in fair value due to market assumption changes 8,039,000 16,570,000 11,241,000 83,165,000  
Ending balance $ 311,382,000 $ 283,806,000 $ 311,382,000 $ 283,806,000 $ 277,608,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]          
Discount rate - risk-free rate plus a market premium (in hundredths)     9.84%   9.51%
Prepayment rate - based upon loan interest rate, original term and loan type     7.15%   7.54%
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)     94   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)     875   875
Loan servicing costs - annually per loan based upon loan type, foreclosure, maximum (in dollars per loan)     $ 8,000   $ 8,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)     4.66%   4.06%
Primary secondary mortgage rate spread 105   105   105
Delinquency rate     2.00%   2.33%