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Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2025	Dec. 31, 2024
Provision (credit) for loan and lease losses:
Reserve for unfunded credits	$ 13,727	$ 13,727	$ 5,981
Provision for credit losses on unfunded commitments	8,400
Allowance for credit loss, completion of revision, period from forecast start date		5 years
Qualitative adjustments to models for credit risk, net	22,600	$ 22,600
General allowance for loan and lease losses	184,300	184,300	107,500
Allowance for credit loss for loans acquired in business combination		84,400
Specific allowance for loan and lease losses	69,400	69,400	$ 17,500
Specific allowance for loan and lease losses period increase (decrease)		51,900
Holdco Merger
Provision (credit) for loan and lease losses:
Specific allowance for loan and lease losses period increase (decrease)		$ 46,600
Minimum
Provision (credit) for loan and lease losses:
Allowance for credit loss, start of revision, period from forecast start date		2 years
Maximum
Provision (credit) for loan and lease losses:
Allowance for credit loss, start of revision, period from forecast start date		3 years
Legacy Berkshire Portfolio
Provision (credit) for loan and lease losses:
Qualitative adjustments to models for credit risk, net	$ 3,500	$ 3,500
Commercial Real Estate | Holdco Merger
Provision (credit) for loan and lease losses:
Specific allowance for loan and lease losses period increase (decrease)		28,200
Commercial and Industrial Loans | Holdco Merger
Provision (credit) for loan and lease losses:
Specific allowance for loan and lease losses period increase (decrease)		18,200
Consumer Loans | Holdco Merger
Provision (credit) for loan and lease losses:
Specific allowance for loan and lease losses period increase (decrease)		$ 200

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Financing Receivable, Excluding Accrued Interest, Allowance For Credit Loss, Acquired In Business Combination

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Reflects the general allowance for bad debts arising from loan and lease portfolios.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Section 45
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Amount of expense (reversal of expense) for expected credit loss for off-balance sheet credit exposure. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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