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Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 125,104   125,104   115,967
Outstanding principal balance of residential mortgage loans serviced for others $ 22,084,578,000   $ 22,084,578,000   $ 20,382,192,000
Weighted average interest rate 3.70%   3.70%   3.64%
Remaining term (in months)     277 months   280 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 333,246,000 $ 304,722,000 $ 293,884,000 $ 277,608,000 $ 277,608,000
Additions 3,842,000 3,154,000 10,812,000 9,757,000  
Acquisitions 3,334,000 2,669,000 34,755,000 33,807,000  
Changes due to principal payments (8,049,000) (7,202,000) (21,508,000) (21,031,000)  
Change in fair value due to market assumption changes (16,453,000) 8,039,000 (2,023,000) 11,241,000  
Ending balance $ 315,920,000 $ 311,382,000 $ 315,920,000 $ 311,382,000 $ 293,884,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]          
Discount rate - risk-free rate plus a market premium (in hundredths)     8.92%   9.72%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed     7.46%   7.34%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)     $ 73   $ 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)     3.63%   3.90%
Primary secondary mortgage rate spread 115   115   105
Delinquency rate     2.09%   2.06%