XML 51 R40.htm IDEA: XBRL DOCUMENT v3.25.3

Loans Receivable and ACL (Details) - USD ($)
$ in Thousands

Sep. 30, 2025

Jun. 30, 2025

Mar. 31, 2025

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

$ 592,932

$ 613,684

Allowance for Credit Loss, Excluding Accrued Interest

6,129

$ 6,321

6,337

$ 6,242

$ 5,955

$ 5,871

Financing Receivable, Excluding Accrued Interest, after Allowance for Credit Loss

$ 586,803

$ 607,347

Percentage of Loan Type

100.00%

100.00%

One-to-four family

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

$ 70,936

$ 74,387

Allowance for Credit Loss, Excluding Accrued Interest

$ 1,484

1,538

$ 1,799

2,013

2,050

2,005

Percentage of Loan Type

12.00%

12.10%

Multifamily

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

$ 162,435

$ 165,812

Allowance for Credit Loss, Excluding Accrued Interest

$ 1,300

1,339

$ 820

759

762

720

Percentage of Loan Type

27.40%

27.00%

Commercial real estate

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

$ 168,016

$ 178,257

Allowance for Credit Loss, Excluding Accrued Interest

$ 937

922

$ 1,465

1,247

1,234

1,222

Percentage of Loan Type

28.30%

29.10%

Construction

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

$ 4,693

$ 4,567

Allowance for Credit Loss, Excluding Accrued Interest

$ 1

1

$ 3

4

3

1

Percentage of Loan Type

0.80%

0.70%

Business

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

^[1]

$ 161,515

$ 164,964

Allowance for Credit Loss, Excluding Accrued Interest

$ 1,737

1,774

$ 1,646

1,539

1,295

1,415

Percentage of Loan Type

^[1]

27.20%

26.90%

Consumer

Accounts, Notes, Loans and Financing Receivable [Line Items]

Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss

^[2]

$ 25,337

$ 25,697

Allowance for Credit Loss, Excluding Accrued Interest

$ 626

$ 734

$ 593

$ 607

$ 553

$ 450

Percentage of Loan Type

^[2]

4.30%

4.20%

[1]	(1) Includes PPP loans and business overdrafts
[2]	2) Includes personal loans and consumer overdrafts

X

- Definition

Percentage of Loan Type

+ References

No definition available.

+ Details

Name:	carv_PercentageOfLoanType
Namespace Prefix:	carv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

+ Details

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

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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

X

- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

+ Details

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

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-5

+ Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

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