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Commitments and Contingencies - Additional Information (Details) - USD ($) | 12 Months Ended
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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

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- 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

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- 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

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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