Mortgage Banking Activities, Mortgage Servicing Rights (Details)	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Summary of Mortgage Servicing Rights [Abstract]
Number of residential mortgage loans serviced for others	125,728	115,967	110,541
Outstanding principal balance of residential mortgage loans serviced for others	$ 22,269,513,000	$ 20,382,192,000	$ 18,863,201,000
Weighted average interest rate (in hundredths)	3.73%	3.64%	3.59%
Remaining contractual term (in months)	276 months	280 months	283 months
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 293,884,000	$ 277,608,000	$ 163,198,000
Additions	14,976,000	12,142,000	18,215,000
Acquisitions	41,655,000	34,593,000	47,675,000
Change in fair value due to loan runoff	(30,807,000)	(27,344,000)	(31,741,000)
Change in fair value due to market changes	18,437,000	(3,115,000)	80,261,000
Ending balance	$ 338,145,000	$ 293,884,000	$ 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)	9.60%	9.72%
Prepayment rate - based upon loan interest rate, original term and loan type	7.09%	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)	$ 6,000	$ 8,000
Primary secondary mortgage rate spread (in basis points)	115	105
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life	4.44%	3.90%
Delinquency rate	2.19%	2.06%