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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
COMMITMENTS AND CONTINGENCIES. |  |
Commitments to originate loans | $ 120 | $ 11,979
Undisbursed portion of construction loans in process | 10,525 | 7,635
Unused lines of credit | 16,385 | 15,391
Unused overdraft privilege amounts | 1,220 | 1,167
Letters of credit |  | 19
Total | $ 28,250 | $ 36,191

X
- Definition The amount of commitments to originate loans with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_CommitmentsToExtendCredit
Namespace Prefix: | clst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of financial instruments with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_FinancialInstrumentsOffBalanceSheetRisk
Namespace Prefix: | clst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of letters of credit with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_FinancialInstrumentsWithOffBalanceSheetRiskLettersOfCredit
Namespace Prefix: | clst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unused lines of credit with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_FinancialInstrumentsWithOffBalanceSheetRiskUnusedLinesOfCredit
Namespace Prefix: | clst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amounts of unused overdraft privilege with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_OverdraftPrivilegeUnusedAmounts
Namespace Prefix: | clst_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of unfunded financial commitments with off-balance-sheet risk. + References No definition available. + Details
Name: | clst_UnfundedConstructionLoansInProcess
Namespace Prefix: | clst_
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