v3.19.1

Consolidated Statements of Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Income Statement [Abstract] |  |
Deposits, related party | $ 1,727 | $ 1,172

X
- Definition Interest Expense, Deposits, Related Party + References No definition available. + Details
Name: | cbnk_InterestExpenseDepositsRelatedParty
Namespace Prefix: | cbnk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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