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Mortgage Banking Activities, Mortgage Servicing Rights (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Summary of Mortgage Servicing Rights [Abstract]          
Number of residential mortgage loans serviced for others 116,980   116,980   110,541
Outstanding principal balance of residential mortgage loans serviced for others $ 20,693,294,000   $ 20,693,294,000   $ 18,863,201,000
Weighted average interest rate 3.58%   3.58%   3.59%
Remaining term (in months)     283 months   283 months
Servicing Asset at Fair Value, Amount [Roll Forward]          
Beginning balance $ 299,803,000 $ 209,563,000 $ 277,608,000 $ 163,198,000 $ 163,198,000
Additions 4,103,000 5,754,000 6,603,000 10,969,000  
Acquisitions 0 44,867,000 31,138,000 44,867,000  
Changes due to principal payments (8,445,000) (7,357,000) (13,829,000) (15,317,000)  
Change in fair value due to market assumption changes 9,261,000 17,485,000 3,202,000 66,595,000  
Ending balance $ 304,722,000 $ 270,312,000 $ 304,722,000 $ 270,312,000 $ 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)     9.44%   9.51%
Prepayment rate - based upon loan interest rate, original term and loan type     7.27%   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)     4.18%   4.06%
Primary secondary mortgage rate spread 105   105   105
Delinquency rate     1.91%   2.33%