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Commitments and Contingencies - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Reserve for unfunded commitments	$ 974,000	$ 1,300,000
Commitments to extend credit, cancelable	1,570,000,000	162,300,000
Commitment losses	$ 0	$ 0

X

- Definition

Reserve for unfunded commitments.

+ References

No definition available.

+ Details

Name:	ck1437958_ReserveForUnfundedCommitments
Namespace Prefix:	ck1437958_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Unused Commitments To Extend Credit, Canceled Unconditionally

+ References

No definition available.

+ Details

Name:	ck1437958_UnusedCommitmentsToExtendCreditCanceledUnconditionally
Namespace Prefix:	ck1437958_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyLossInPeriod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration