v3.26.1

Deposits - Narrative (Details)	Dec. 31, 2025 USD ($) client	Dec. 31, 2024 USD ($) client
Insurance [Abstract]
Interest-bearing domestic deposit, brokered	$ 0	$ 0
Deposits liabilities, reciprocal	106,700,000	130,300,000
Deposit liabilities, one way sell	$ 359,900,000	$ 63,300,000
Clients with an individual deposit exceeding 5% \| client	0	2
Deposit balance, total value of client deposits exceeding five percent of total deposits		$ 202,600,000
Deposit balance, total value of client deposits exceeding five percent of total deposits, percentage		16.20%
Related party deposit liabilities	$ 1,800,000	$ 2,000,000.0

Deposit Balance, Total Value of Client Deposits Exceeding Five Percent of Total Deposits

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Deposit Balance, Total Value of Client Deposits Exceeding Five Percent of Total Deposits, Percentage

+ References

No definition available.

+ Details

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- Definition

Deposit Liabilities, One-Way Sell

+ References

No definition available.

+ Details

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Namespace Prefix:	chnbrdg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Deposits Liabilities, Reciprocal

+ References

No definition available.

+ Details

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Namespace Prefix:	chnbrdg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of Clients With an Individual Deposit Exceeding Five Percent of Total Deposits

+ References

No definition available.

+ Details

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Namespace Prefix:	chnbrdg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
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- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(12))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

CHAIN BRIDGE BANCORP INC 10-K