LOANS AND ALLOWANCE FOR CREDIT LOSSES - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	12 Months Ended
Sep. 30, 2022	Sep. 30, 2022	Dec. 31, 2022
Bank impaired loans
With No Related Allowance Recorded, Recorded investment	$ 23,054	$ 23,054	$ 19,076
With An Allowance Recorded, Recorded Investment	6,660	6,660	7,747
Recorded Investment, Total	29,714	29,714	26,823
With No Related Allowance Recorded, Unpaid Principal Balance	23,270	23,270	19,172
With An Allowance Recorded, Unpaid Principal Balance	6,660	6,660	7,747
Unpaid Principal Balance, Total	29,930	29,930	26,919
With An Allowance Recorded, Related Allowance	699	699	826
With No Related Allowance Recorded, Average Recorded Investment	23,219	26,151	24,735
With An Allowance Recorded , Average Recorded Investment	6,333	6,316	6,601
Average Recorded Investment, Total	29,552	32,467	31,336
With No Related Allowance Recorded, Interest Income Recognized	248	772	1,030
With An Allowance Recorded, Interest Income Recognized	81	107	388
Interest Income Recognized, Total	329	879	1,418
Commercial/Agricultural Real Estate
Bank impaired loans
With No Related Allowance Recorded, Recorded investment	12,002	12,002	9,741
With An Allowance Recorded, Recorded Investment	6,660	6,660	7,108
Recorded Investment, Total	18,662	18,662	16,849
With No Related Allowance Recorded, Unpaid Principal Balance	12,038	12,038	9,766
With An Allowance Recorded, Unpaid Principal Balance	6,660	6,660	7,108
Unpaid Principal Balance, Total	18,698	18,698	16,874
With An Allowance Recorded, Related Allowance	699	699	519
With No Related Allowance Recorded, Average Recorded Investment	12,646	14,636	13,657
With An Allowance Recorded , Average Recorded Investment	6,232	5,758	6,028
Average Recorded Investment, Total	18,878	20,394	19,685
With No Related Allowance Recorded, Interest Income Recognized	105	410	549
With An Allowance Recorded, Interest Income Recognized	81	95	273
Interest Income Recognized, Total	186	505	822
C&I/Agricultural operating
Bank impaired loans
With No Related Allowance Recorded, Recorded investment	4,710	4,710	2,744
With An Allowance Recorded, Recorded Investment	0	0	538
Recorded Investment, Total	4,710	4,710	3,282
With No Related Allowance Recorded, Unpaid Principal Balance	4,829	4,829	2,754
With An Allowance Recorded, Unpaid Principal Balance	0	0	538
Unpaid Principal Balance, Total	4,829	4,829	3,292
With An Allowance Recorded, Related Allowance	0	0	249
With No Related Allowance Recorded, Average Recorded Investment	4,478	4,898	4,467
With An Allowance Recorded , Average Recorded Investment	0	207	273
Average Recorded Investment, Total	4,478	5,105	4,740
With No Related Allowance Recorded, Interest Income Recognized	57	139	200
With An Allowance Recorded, Interest Income Recognized	0	10	48
Interest Income Recognized, Total	57	149	248
Residential Mortgage
Bank impaired loans
With No Related Allowance Recorded, Recorded investment	6,229	6,229	5,846
With An Allowance Recorded, Recorded Investment	0	0	91
Recorded Investment, Total	6,229	6,229	5,937
With No Related Allowance Recorded, Unpaid Principal Balance	6,290	6,290	5,907
With An Allowance Recorded, Unpaid Principal Balance	0	0	91
Unpaid Principal Balance, Total	6,290	6,290	5,998
With An Allowance Recorded, Related Allowance	0	0	48
With No Related Allowance Recorded, Average Recorded Investment	5,957	6,419	6,304
With An Allowance Recorded , Average Recorded Investment	101	350	298
Average Recorded Investment, Total	6,058	6,769	6,602
With No Related Allowance Recorded, Interest Income Recognized	85	218	276
With An Allowance Recorded, Interest Income Recognized	0	2	65
Interest Income Recognized, Total	85	220	341
Consumer Installment
Bank impaired loans
With No Related Allowance Recorded, Recorded investment	113	113	745
With An Allowance Recorded, Recorded Investment	0	0	10
Recorded Investment, Total	113	113	755
With No Related Allowance Recorded, Unpaid Principal Balance	113	113	745
With An Allowance Recorded, Unpaid Principal Balance	0	0	10
Unpaid Principal Balance, Total	113	113	755
With An Allowance Recorded, Related Allowance	0	0	10
With No Related Allowance Recorded, Average Recorded Investment	138	198	307
With An Allowance Recorded , Average Recorded Investment	0	1	2
Average Recorded Investment, Total	138	199	309
With No Related Allowance Recorded, Interest Income Recognized	1	5	5
With An Allowance Recorded, Interest Income Recognized	0	0	2
Interest Income Recognized, Total	$ 1	$ 5	$ 7

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-17

+ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

+ Details

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

- References

No definition available.

+ Details

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

- Definition

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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

+ Details

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

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

+ 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

+ 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 investment in impaired financing receivables for which there is no related allowance for credit losses.

+ References

+ Details

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

- 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 investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

+ Details

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

- 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

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czwi_CommercialAgriculturalRealEstatePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czwi_CIAgriculturalOperatingPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czwi_ResidentialMortgagePortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=czwi_ConsumerInstallmentPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: