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Business Combinations - Narrative (Details) - shares			12 Months Ended
	Mar. 31, 2023	Mar. 20, 2023	Dec. 31, 2024
Core deposit intangible
Business Acquisition [Line Items]
Estimated useful life			8 years 2 months 12 days
Signature Bridge Bank | Core deposit intangible
Business Acquisition [Line Items]
Estimated useful life		10 years
Signature Bridge Bank | FDIC
Business Acquisition [Line Items]
Shares issued (in shares)	13,010,668
Flagstar Bancorp | Core deposit intangible
Business Acquisition [Line Items]
Estimated useful life		10 years

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

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- Definition

Number of shares of equity interests issued or issuable to acquire entity.

+ References

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-Topic 805
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479581/805-30-50-1

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
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-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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