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Mortgage Banking Activities, Mortgage Servicing Rights (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)
Summary of Mortgage Servicing Rights [Abstract]
Number of residential mortgage loans serviced for others	128,576		125,728
Outstanding principal balance of residential mortgage loans serviced for others	$ 22,959,556,000		$ 22,269,513,000
Weighted average interest rate	3.77%		3.73%
Remaining term (in months)	275 months		276 months
Servicing Asset at Fair Value, Amount [Roll Forward]
Beginning balance	$ 338,145,000	$ 293,884,000	$ 293,884,000
Additions	2,509,000	2,516,000
Acquisitions	14,615,000	17,400,000
Changes due to principal payments	(5,918,000)	(5,447,000)
Change in fair value due to market assumption changes	(7,240,000)	10,977,000
Ending balance	$ 342,111,000	$ 319,330,000	$ 338,145,000
Servicing Assets at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Discount rate - risk-free rate plus a market premium (in hundredths)	9.39%		9.60%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed	6.93%		7.09%
Loan servicing costs - annually per loan based upon loan type, performing, minimum (in dollars per loan)	$ 73		$ 73
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		$ 6,000
Escrow earnings rate - indexed to rates paid on deposit accounts with comparable average life (in hundredths)	3.88%		4.44%
Primary secondary mortgage rate spread	128		115
Delinquency rate	1.98%		2.19%

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- Definition

The decrease in fair value as a result of loan runoff.

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Mortgage rate spread between the primary and secondary market.

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Indicates the number of mortgage loans being serviced.

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Dollar amount of principal outstanding on mortgage loans being serviced.

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Represents the weighted average remaining term of mortgage loans being serviced fro others.

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The value of new servicing assets, subsequently measured at fair value, acquired during the current period through purchases of financial assets.

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Servicing Assets at Fair Value Assumptions Used to Estimate Fair Value Delinquent Loan Service Cost Minimum

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Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Delinquent

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The escrow earning rate used to estimate the fair value of servicing assets, based on rates paid on deposit accounts.

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Servicing Assets At Fair Value Assumptions Used to Estimate Fair Value Foreclosure Loan Service Cost Maximum

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The maximum cost to service a performing loan for the period used as a variable in estimating fair value.

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The minimum cost to service a performing loan for the period used as a variable in estimating fair value.

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Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Delinquency Rate

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Represents the weighted average interest rate of loans servicedf for others as of the balance sheet date.

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Amount of increase (decrease) in fair value from changes in the assumptions or model used to calculate the fair value of a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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Discount rate used to estimate the fair value of servicing assets and servicing liabilities.

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Estimated rate of prepayments of principal on servicing assets and servicing liabilities.

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