Total commitments available for funding to clients with financing receivables modified by troubled debt restructurings.

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+ References

No definition available.

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Amount of financing receivable modified as troubled debt restructuring.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

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- Definition

Reflects the amount of the write-down related to a troubled debt restructuring.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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Loans and Allowance for Credit Losses: Loans and Unfunded Credit Commitments - Summary of Loans Modified in Troubled Debt Restructurings (TDRs) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) troubled_debt_restructuring	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDRs \| troubled_debt_restructuring	62
Loans modified in TDRs	$ 96,000,000	$ 61,000,000
Unfunded commitments available for funding	0
Partial charge-offs on loans classified as TDRs	$ 6,000,000	31,000,000	$ 11,000,000
Boston Private
Financing Receivable, Troubled Debt Restructuring [Line Items]
Number of TDRs \| troubled_debt_restructuring	51
Loans modified in TDRs	$ 47,000,000
Investor dependent
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	15,000,000	36,000,000
Investor dependent \| Early stage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	12,000,000	7,000,000
Investor dependent \| Growth stage
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	3,000,000	29,000,000
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Cash flow dependent - SLBO
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	34,000,000	22,000,000
Cash flow dependent and innovation C&I (Commercial and Industrial) \| Innovation C&I (Commercial and Industrial)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	0	1,000,000
Private Bank
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	12,000,000	0
CRE
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	33,000,000	0
Premium wine and other \| Premium wine
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	0	2,000,000
Other C&I
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans modified in TDRs	$ 2,000,000	$ 0