XML 94 R80.htm IDEA: XBRL DOCUMENT
v3.8.0.1

COMMITMENTS AND CONTINGENCIES, INCLUDING FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK - Contingent Liabilities (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($)
Contingent Liabilities |  |
Number of private investment funds under the Small Business Investment Company (SBIC) program | item | 2 |
Unfunded commitments | $ 3.8 | $ 4.0
Cumulative capital contributions | $ 1.6 | $ 1.5

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

X
- Definition The amount of cumulative capital contributions. + References No definition available. + Details
Name: | cbtx_CumulativeCapitalContributions
Namespace Prefix: | cbtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of private investment funds under the Small Business Investment Company (SBIC) program of the U.S. Small Business Administration. + References No definition available. + Details
Name: | cbtx_NumberOfPrivateInvestmentsFundsUnderSmallBusinessInvestmentCompanyProgram
Namespace Prefix: | cbtx_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of unfunded commitments. + References No definition available. + Details
Name: | cbtx_UnfundedCommitments
Namespace Prefix: | cbtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant