LOANS, Individually Evaluated For Impairment (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Loans individually evaluated for impairment [Abstract]
Unpaid principal balance with no related allowance recorded	$ 7,485,000	$ 4,617,000
Unpaid principal balance with an allowance recorded	3,574,000	2,725,000
Unpaid principal balance, total	11,059,000	7,342,000
Recorded investment with no related allowance recorded	5,679,000	2,615,000
Recorded investment with an allowance recorded	3,243,000	2,503,000
Recorded investment, total	8,922,000	5,118,000
Allowance for loan losses allocated	628,000	999,000
Individually evaluated for impairment, loan balances	8,849,000	4,429,000
Acquired with Deteriorated Credit Quality [Member]
Loans individually evaluated for impairment [Abstract]
Individually evaluated for impairment, loan balances	73,000	689,000
Residential Real Estate [Member]
Loans individually evaluated for impairment [Abstract]
Unpaid principal balance with no related allowance recorded	171,000	175,000
Recorded investment with no related allowance recorded	54,000	57,000
Individually evaluated for impairment, loan balances	54,000	57,000
Multifamily Real Estate [Member]
Loans individually evaluated for impairment [Abstract]
Individually evaluated for impairment, loan balances	0	0
Commercial Real Estate [Member] \| Owner Occupied [Member]
Loans individually evaluated for impairment [Abstract]
Unpaid principal balance with no related allowance recorded	3,535,000	2,295,000
Unpaid principal balance with an allowance recorded		506,000
Recorded investment with no related allowance recorded	3,267,000	1,815,000
Recorded investment with an allowance recorded		490,000
Allowance for loan losses allocated		240,000
Individually evaluated for impairment, loan balances	3,267,000	1,981,000
Commercial Real Estate [Member] \| Non-Owner Occupied [Member]
Loans individually evaluated for impairment [Abstract]
Unpaid principal balance with no related allowance recorded	3,270,000	1,638,000
Unpaid principal balance with an allowance recorded	3,139,000	1,638,000
Recorded investment with no related allowance recorded	2,358,000	743,000
Recorded investment with an allowance recorded	2,854,000	1,465,000
Allowance for loan losses allocated	352,000	385,000
Individually evaluated for impairment, loan balances	5,139,000	1,843,000
Commercial and Industrial [Member]
Loans individually evaluated for impairment [Abstract]
Unpaid principal balance with no related allowance recorded	509,000	509,000
Unpaid principal balance with an allowance recorded	435,000	581,000
Recorded investment with no related allowance recorded	0	0
Recorded investment with an allowance recorded	389,000	548,000
Allowance for loan losses allocated	276,000	374,000
Individually evaluated for impairment, loan balances	389,000	548,000
Construction and Land [Member]
Loans individually evaluated for impairment [Abstract]
Individually evaluated for impairment, loan balances	$ 0	$ 0

No definition available.

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

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

+ Details

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

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953550-111524

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- 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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

+ Details

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

- Details

Name:	us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

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

- Details

Name:	us-gaap_CollateralAxis=pfbi_OwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CollateralAxis=pfbi_NonOwnerOccupiedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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