Fair Value Measurements, Estimated Fair Values and Related Carrying or Notional Amounts (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Assets [Abstract]
Cash and cash equivalents	$ 50,602	$ 42,217
Securities available-for-sale	145,453	148,247
Restricted securities	3,479	3,853
Loans held for sale	754	479
Loans, net of allowances for loan losses	750,421	763,898
Bank owned life insurance	27,153	26,763
Accrued interest receivable	3,223	3,095
Liabilities [Abstract]
Deposits	847,784	843,144
Overnight repurchase agreements	18,011	25,775
Federal Home Loan Bank advances	50,000	60,000
Other borrowings	2,250	2,550
Accrued interest payable	651	594
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and cash equivalents	50,602	42,217
Securities available-for-sale	0	0
Restricted securities	0	0
Loans held for sale	0	0
Loans, net of allowances for loan losses	0	0
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Liabilities [Abstract]
Deposits	0	0
Overnight repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and cash equivalents	0	0
Securities available-for-sale	145,453	148,247
Restricted securities	3,479	3,853
Loans held for sale	754	479
Loans, net of allowances for loan losses	0	0
Bank owned life insurance	27,153	26,763
Accrued interest receivable	3,223	3,095
Liabilities [Abstract]
Deposits	851,342	843,818
Overnight repurchase agreements	18,011	25,775
Federal Home Loan Bank advances	50,347	59,975
Other borrowings	2,250	2,550
Accrued interest payable	651	594
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and cash equivalents	0	0
Securities available-for-sale	0	0
Restricted securities	0	0
Loans held for sale	0	0
Loans, net of allowances for loan losses	741,154	749,848
Bank owned life insurance	0	0
Accrued interest receivable	0	0
Liabilities [Abstract]
Deposits	0	0
Overnight repurchase agreements	0	0
Federal Home Loan Bank advances	0	0
Other borrowings	0	0
Accrued interest payable	$ 0	$ 0

The fair value portion of other miscellaneous borrowings owed by the reporting entity.

No definition available.

Name:	opof_OtherBorrowingsFairValueDisclosure
Namespace Prefix:	opof_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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 element represents the fair value of overnight repurchase agreements.

+ References

No definition available.

+ Details

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- References

No definition available.

+ Details

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- 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.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI).

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

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

+ References

+ Details

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

- Definition

Amount of interest payable on debt, including, but not limited to, trade payables.

+ References

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 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.15(a))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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- Definition

Carrying amount as of the balance sheet date of interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.8)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
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- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- 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

+ Details

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

- Definition

The aggregate value of all restricted investments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-12C.9(c))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010

Reference 2: 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))
-URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010

+ Details

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