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Financing receivable modifications subsequent default number of contracts.

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Impaired financing receivables unpaid principal balance.

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Loans and leases accrued interest.

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Percentage of baseline economic forecast.

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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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Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

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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)	3 Months Ended		6 Months Ended
	Jun. 30, 2024 USD ($) Loan	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Loan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)
Accounts Notes And Loans Receivable [Line Items]
Accrued interest	$ 121,600,000		$ 121,600,000		$ 124,700,000
Percentage of baseline economic forecast	40.00%	40.00%	40.00%	40.00%
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	$ 86,253,000		$ 86,253,000		59,036,000
Recorded Investment		$ 0		$ 0
Loans held for sale	27,354,000		27,354,000		26,124,000
Modified Loans To Borrowers Experiencing Financial Difficulty [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	5,300,000		5,300,000		100,000
Accruing and nonaccruing	62,700,000		62,700,000		24,500,000
Unfunded commitment to borrowers related to MEFD or TDR	$ 7,200,000		$ 7,200,000		700,000
Downside Mild Recessionary S-2 [Member]
Accounts Notes And Loans Receivable [Line Items]
Percentage of baseline economic forecast	60.00%	60.00%	60.00%	60.00%
Residential Mortgages [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 28,293,000		$ 28,293,000		26,137,000
Number of contracts subsequently defaulted \| Loan	1		1
Recorded Investment	$ 100,000		$ 100,000
Loans carried at fair value option	26,100,000		26,100,000		13,300,000
Unpaid principal balance	25,400,000		25,400,000		12,900,000
Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	9,972,000		9,972,000		8,555,000
Real estate in process of foreclosure	5,200,000		5,200,000		7,100,000
Real estate acquired through foreclosure	1,600,000		1,600,000		1,600,000
Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 22,611,000		$ 22,611,000		23,068,000
Commercial Non-Real Estate [Member] \| Consumer [Member]
Accounts Notes And Loans Receivable [Line Items]
Number of contracts subsequently defaulted \| Loan	1		4
Recorded Investment	$ 6,300,000		$ 9,600,000
Commercial Non-Real Estate [Member] \| Total Commercial And Industrial [Member] \| Total Commercial [Member]
Accounts Notes And Loans Receivable [Line Items]
Nonaccrual loans	$ 17,951,000		$ 17,951,000		$ 20,840,000