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v3.22.4

Recent accounting standards (Details) | Jan. 01, 2023 | Dec. 31, 2022
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Allowance for credit losses and reserve for unfunded loan commitments |  | 3.00%
Subsequent Event |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |
Allowance for credit losses and reserve for unfunded loan commitments | 10.00% |

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- Definition Allowance For Credit Losses and Reserve For Unfunded Loan Commitments, Percent + References No definition available. + Details
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Namespace Prefix: | ck1437958_
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Balance Type: | na
Period Type: | instant

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |