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Loans and Allowance for Credit Losses Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance of loans evaluated individually for impairment			$ 1,000,000.0	$ 1,000,000.0
Impaired loans with principal balances approximately in percentage	97.00%		90.00%
Impaired loans balances, real estate as collateral	$ 1,000,000.0			1,000,000.0
Net loans	24,041,489,000			24,041,489,000		$ 24,044,919,000
Borrowers with loan modifications, commitments to lend additional funds	0			0
Net loans (charged off) recovered	(10,929,000)	$ (11,122,000)		(35,233,000)	$ (31,022,000)
Without a Related Allowance	66,258,000			66,258,000		$ 105,173,000
Loans - Excluding OBS Credit Exposure
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net loans (charged off) recovered	$ (10,929,000)	$ (11,122,000)		$ (35,233,000)	$ (31,022,000)

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Represents the maximum balance of impaired loans that are pooled and evaluated collectively for impairment, rather than individually evaluated for impairment.

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Represents the minimum principal balance threshold for disclosing impaired loans primarily secured by real estate that were measured at estimated fair value using certified third party appraisals updated in the previous 12 months.

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Percentage of impaired loans primarily collateralized by real estate with principal balances greater than $1 million that were measured at estimated fair value using certified third party appraisals that had been updated in the previous 12 months.

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Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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Amount of financing receivable without allowance for credit loss evaluated on individual basis. Excludes financing receivable evaluated on collective basis.

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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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Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

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