Loans And Allowance For Loan Losses (Impaired Loan Data) (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended
Jun. 30, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
Impaired Balance With No Related Allowance Recorded	$ 5,220	$ 5,004
Related Allowance With No Related Allowance Recorded
Average Recorded Investment With No Related Allowance Recorded	6,047	5,029
Interest Income Recorded With No Related Allowance Recorded	63	55
Interest Income Collected With No Related Allowance Recorded	69	108
Impaired Balance With an Allowance Recorded	7,922	8,782
Related Allowance With an Allowance Recorded	1,845	1,258
Average Recorded Investment With an Allowance Recorded	7,959	9,938
Interest Income Recorded With an Allowance Recorded	34	103
Interest Income Collected With an Allowance Recorded	33	165
Impaired Balance	13,142	13,786
Related Allowance	1,845	1,258
Average Recorded Investment	14,006	14,967
Interest Income Recorded	97	158
Interest Income Collected	102	273
Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Balance With No Related Allowance Recorded
Related Allowance With No Related Allowance Recorded
Average Recorded Investment With No Related Allowance Recorded
Interest Income Recorded With No Related Allowance Recorded
Interest Income Collected With No Related Allowance Recorded
Impaired Balance With an Allowance Recorded		12
Related Allowance With an Allowance Recorded		12
Average Recorded Investment With an Allowance Recorded		12
Interest Income Recorded With an Allowance Recorded
Interest Income Collected With an Allowance Recorded
Impaired Balance		12
Related Allowance		12
Average Recorded Investment		12
Interest Income Recorded
Interest Income Collected
Construction And Land Development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Balance With No Related Allowance Recorded	2,479	2,504
Related Allowance With No Related Allowance Recorded
Average Recorded Investment With No Related Allowance Recorded	2,489	2,529
Interest Income Recorded With No Related Allowance Recorded	49	87
Interest Income Collected With No Related Allowance Recorded	48	108
Impaired Balance With an Allowance Recorded	3,186	3,197
Related Allowance With an Allowance Recorded	1,295	584
Average Recorded Investment With an Allowance Recorded	3,221	3,902
Interest Income Recorded With an Allowance Recorded
Interest Income Collected With an Allowance Recorded
Impaired Balance	5,665	5,701
Related Allowance	1,295	584
Average Recorded Investment	5,710	6,431
Interest Income Recorded	49	87
Interest Income Collected	48	108
Residential, 1-4 Families [Member]
Financing Receivable, Impaired [Line Items]
Impaired Balance With No Related Allowance Recorded	139
Related Allowance With No Related Allowance Recorded
Average Recorded Investment With No Related Allowance Recorded	137
Interest Income Recorded With No Related Allowance Recorded	2
Interest Income Collected With No Related Allowance Recorded	2
Impaired Balance With an Allowance Recorded		612
Related Allowance With an Allowance Recorded		73
Average Recorded Investment With an Allowance Recorded		791
Interest Income Recorded With an Allowance Recorded		13
Interest Income Collected With an Allowance Recorded		16
Impaired Balance	139	612
Related Allowance		73
Average Recorded Investment	137	791
Interest Income Recorded	2	13
Interest Income Collected	2	16
Nonfarm, Nonresidential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Balance With No Related Allowance Recorded	2,602	2,500
Related Allowance With No Related Allowance Recorded
Average Recorded Investment With No Related Allowance Recorded	3,421	2,500
Interest Income Recorded With No Related Allowance Recorded	12	(32)
Interest Income Collected With No Related Allowance Recorded	19
Impaired Balance With an Allowance Recorded	4,736	4,961
Related Allowance With an Allowance Recorded	550	589
Average Recorded Investment With an Allowance Recorded	4,738	5,233
Interest Income Recorded With an Allowance Recorded	34	90
Interest Income Collected With an Allowance Recorded	33	149
Impaired Balance	7,338	7,461
Related Allowance	550	589
Average Recorded Investment	8,159	7,733
Interest Income Recorded	46	58
Interest Income Collected	$ 52	$ 149

Impaired Financing Receivable Related Allowance With Allowance Recorded

No definition available.

Name:	cdbk_ImpairedFinancingReceivableRelatedAllowanceWithAllowanceRecorded
Namespace Prefix:	cdbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Impaired Financing Receivable With No Related Allowance

+ References

No definition available.

+ Details

Name:	cdbk_ImpairedFinancingReceivableWithNoRelatedAllowance
Namespace Prefix:	cdbk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant