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Fair Value Measurements - Estimated Fair Values of Company's Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Carrying Amount
Financial assets
Cash and cash equivalents	$ 70,892	$ 30,080
Loans, net of allowance	462,730	458,823
Federal Home Loan Bank stock	3,979	2,499
Accrued interest receivable	3,724	3,403
Financial liabilities
Deposits	628,012	649,913
Securities sold under agreements to repurchase	28,584	18,106
Subordinated debentures	23,771	23,726
Advance Federal Home Loan Bank	75,000
Interest payable	514	304
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value
Financial assets
Cash and cash equivalents	70,892	30,080
Loans, net of allowance	0	0
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities
Deposits	0	0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Advance Federal Home Loan Bank	0
Interest payable	0	0
Significant Other Observable Inputs (Level 2) | Fair value
Financial assets
Cash and cash equivalents	0	0
Loans, net of allowance	0	0
Federal Home Loan Bank stock	3,979	2,499
Accrued interest receivable	3,724	3,403
Financial liabilities
Deposits	626,332	646,455
Securities sold under agreements to repurchase	28,584	18,106
Subordinated debentures	21,953	24,454
Advance Federal Home Loan Bank	73,195
Interest payable	514	304
Significant Unobservable Inputs (Level 3) | Fair value
Financial assets
Cash and cash equivalents	0	0
Loans, net of allowance	440,243	444,704
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities
Deposits	0	0
Securities sold under agreements to repurchase	0	0
Subordinated debentures	0	0
Advance Federal Home Loan Bank	0
Interest payable	$ 0	$ 0

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Fair value portion of accrued interest receivable by the entity.

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Fair value portion of interest payable by the entity.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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- Definition

Fair value of subordinated debt obligations including, but not limited to, subordinated loan, subordinated bond, subordinated debenture or junior debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.13(3)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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- Definition

Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Publisher FASB
-URI https://asc.fasb.org//310-10/tableOfContent

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- Definition

Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

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