LOANS, Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	$ 8,685	$ 11,110	$ 7,496	$ 11,464
Interest income recognized	3	40	156	80
Cash basis interest recognized	3	2	156	42
Residential Real Estate [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	55	61	56	62
Interest income recognized	0	0	0	0
Cash basis interest recognized	0	0	0	0
Multifamily Real Estate [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	0	3,753	0	3,744
Interest income recognized	0	0	0	0
Cash basis interest recognized	0	0	0	0
Commercial Real Estate [Member] \| Owner Occupied [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	3,532	1,785	3,123	2,191
Interest income recognized	3	3	155	6
Cash basis interest recognized	3	1	155	4
Commercial Real Estate [Member] \| Non-Owner Occupied [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	4,703	4,429	3,871	4,376
Interest income recognized	0	36	0	72
Cash basis interest recognized	0	0	0	36
Commercial and Industrial [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	395	768	446	738
Interest income recognized	0	1	1	2
Cash basis interest recognized	0	1	1	2
Construction and Land [Member]
Average Balance of Loans Individually Evaluated for Impairment and Interest Income Recognized [Abstract]
Average recorded investment	0	314	0	353
Interest income recognized	0	0	0	0
Cash basis interest recognized	$ 0	$ 0	$ 0	$ 0

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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 (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

+ Details

Name:	us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- References

No definition available.

+ Details

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

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

+ Details

Name:	us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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: