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Financing receivable modifications subsequent default number of contracts.

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Weighted average interest rate reduction, basis points.

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Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

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Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

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Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

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Amount of commitment to lend additional funds to debtor experiencing financial difficulty for which creditor has modified terms of financing receivable.

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Amount, before valuation allowance, of financing receivable classified as held-for-sale.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Loans and Allowance for Credit Losses (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) Loan	Jun. 30, 2025 USD ($) Loan	Jun. 30, 2026 USD ($) Loan	Jun. 30, 2025 USD ($) Loan	Dec. 31, 2025 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Accrued interest	$ 108,000		$ 108,000		$ 105,100
Percentage of baseline economic forecast	50.00%	50.00%	50.00%	50.00%
Description of post modification defaults			A payment default occurs if the loan is either 90 days or more delinquent or has been charged off as of the end of the period presented.
Nonaccrual loans	$ 113,681		$ 113,681		106,870
Real estate in process of foreclosure	52,900		52,900		33,200
Loans held for sale	52,850		52,850		33,158
Modified Loans To Borrowers Experiencing Financial Difficulty [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	11,400		11,400		5,800
Accruing and nonaccruing	154,300		154,300		162,800
Unfunded exposure to borrowers related to MEFD or TDR	$ 3,100		$ 3,100		7,200
Downside Mild Recessionary S-2 [Member]
Accounts Notes And Loans Receivable [Line Items]
Percentage of baseline economic forecast	50.00%	50.00%	50.00%	50.00%
Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of contracts subsequently defaulted \| Loan	4	6	8	8
Recorded Investment	$ 32,800	$ 18,900	$ 72,900	$ 20,800
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 51,508		$ 51,508		46,986
Number of contracts subsequently defaulted \| Loan	2		3
Recorded Investment	$ 2,200		$ 2,300
Loans carried at fair value option	42,900		42,900		33,200
Unpaid principal balance	41,800		41,800		32,300
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	11,550		11,550		10,703
Real estate in process of foreclosure	18,000		18,000		12,000
Real estate acquired through foreclosure	$ 4,400		$ 4,400		5,100
Weighted Average [Member] \| Total Commercial [Member] \| Term Extension [Member]
Accounts Notes And Loans Receivable [Line Items]
Reportable modification period	1 year	2 months	13 months	3 months
Weighted Average [Member] \| Total Commercial [Member] \| Other Than Insignificant Payment Delays [Member]
Accounts Notes And Loans Receivable [Line Items]
Reportable modification period	2 months	4 months	11 months	4 months
Weighted Average [Member] \| Residential Mortgages [Member] \| Term Extension [Member]
Accounts Notes And Loans Receivable [Line Items]
Reportable modification period	2 years	17 months	2 years	13 months
Weighted Average [Member] \| Residential Mortgages [Member] \| Other Than Insignificant Payment Delays [Member]
Accounts Notes And Loans Receivable [Line Items]
Reportable modification period				1 month
Weighted Average [Member] \| Consumer [Member] \| Term Extension [Member]
Accounts Notes And Loans Receivable [Line Items]
Reportable modification period	4 years		5 years
Weighted Average [Member] \| Energy Related Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Weighted average interest rate reduction, basis points	1.64%		1.64%
Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 47,157		$ 47,157		41,248
Commercial Non-Real Estate [Member] \| Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	40,205		40,205		34,525
Commercial Real Estate - Owner Occupied [Member] \| Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 6,952		$ 6,952		$ 6,723