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Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 125,698   125,698   115,967
Outstanding principal balance of residential mortgage loans serviced for others $ 22,188,347,000   $ 22,188,347,000   $ 20,382,192,000
Weighted average interest rate 3.68%   3.68%   3.64%
Remaining term (in months)     278 months   280 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 319,330,000 $ 299,803,000 $ 293,884,000 $ 277,608,000 $ 277,608,000
Additions 4,454,000 4,103,000 6,970,000 6,603,000  
Acquisitions 14,021,000 0 31,421,000 31,138,000  
Changes due to principal payments (8,012,000) (8,445,000) (13,459,000) (13,829,000)  
Change in fair value due to market assumption changes 3,453,000 9,261,000 14,430,000 3,202,000  
Ending balance $ 333,246,000 $ 304,722,000 $ 333,246,000 $ 304,722,000 $ 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)     9.91%   9.72%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed     6.75%   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)     4.38%   3.90%
Primary secondary mortgage rate spread 115   115   105
Delinquency rate     2.48%   2.06%