Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financial assets
Securities held-to-maturity	$ 9,225	$ 13,950
Loans held for sale	1,378	622
Bank-owned life insurance	21,416	18,894
Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	488	328
Carrying Value [Member]
Financial assets
Cash and cash equivalents	181,652	102,017
Securities held-to-maturity	9,045	13,869
Restricted stock	4,614	4,614
Loans held for sale	1,378	622
Net loans	600,885	544,616
Bank-owned life insurance	21,416	18,894
Accrued interest receivable	2,159	1,641
Financial liabilities
Deposits	891,562	683,546
Short-term borrowings	37,215	38,889
Other borrowings	4,664	6,330
Accrued interest payable	90	127
Carrying Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	488	328
Fair Value [Member]
Financial assets
Cash and cash equivalents	181,652	102,017
Securities held-to-maturity	9,225	13,950
Loans held for sale	1,378	622
Net loans	598,583	542,981
Bank-owned life insurance	21,416	18,894
Accrued interest receivable	2,159	1,641
Financial liabilities
Deposits	892,357	683,425
Short-term borrowings	37,215	38,889
Other borrowings	4,775	6,273
Accrued interest payable	90	127
Fair Value [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	488	328
Fair Value [Member] \| Level I [Member]
Financial assets
Cash and cash equivalents	181,652	102,017
Loans held for sale	1,378	622
Bank-owned life insurance	21,416	18,894
Accrued interest receivable	2,159	1,641
Financial liabilities
Deposits	768,230	555,985
Short-term borrowings	37,215	38,889
Accrued interest payable	90	127
Fair Value [Member] \| Level II [Member]
Financial assets
Securities held-to-maturity	9,225	13,950
Fair Value [Member] \| Level III [Member]
Financial assets
Net loans	598,583	542,981
Financial liabilities
Deposits	124,127	127,440
Other borrowings	4,775	6,273
Fair Value [Member] \| Level III [Member] \| Mortgage Servicing Rights [Member]
Financial assets
Mortgage servicing rights	$ 488	$ 328

Accrued interest payable fair value disclosure.

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- Definition

Accrued interest receivable fair value disclosure.

+ References

No definition available.

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- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(10))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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- Definition

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.

+ References

No definition available.

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

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

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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-SubTopic 10
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-Paragraph 5A
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- Definition

Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2196772

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- Definition

The aggregate value of all restricted investments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-12.6(c))
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- Definition

Aggregate amount of servicing assets that are subsequently measured at fair value and servicing assets that are subsequently measured using the amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents the amount of short-term debt existing as of the balance sheet date.

+ References

No definition available.

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