No definition available.

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

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

+ Details

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

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

+ Details

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

- Definition

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

+ References

+ Details

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

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544

+ Details

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

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

+ Details

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

- References

No definition available.

+ Details

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

- Details

Name:	us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
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=us-gaap_ConsumerPortfolioSegmentMember
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:

- Details

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

LOANS, Allowance for Loan Losses and Recorded Investment in Loans by Portfolio Segment Based on Impairment Method (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	$ 1,402	$ 596
Collectively evaluated for impairment, allowance for loan losses	10,602	10,230
Total allowance for loan losses	12,104	10,836	$ 9,647	$ 10,347
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	24,931	33,588
Collectively evaluated for impairment, loan balances	1,019,345	979,914
Total Loans	1,049,052	1,024,823
Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	100	10
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	199	208
Total Loans	4,776	11,321
Residential Real Estate [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	0	0
Collectively evaluated for impairment, allowance for loan losses	2,986	2,948
Total allowance for loan losses	2,986	2,948	2,501	2,093
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	308	379
Collectively evaluated for impairment, loan balances	337,200	340,296
Total Loans	338,829	342,294
Residential Real Estate [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	1,321	1,619
Multifamily Real Estate [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	218	0
Collectively evaluated for impairment, allowance for loan losses	760	785
Total allowance for loan losses	978	785	821	304
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	2,462	13,641
Collectively evaluated for impairment, loan balances	59,689	60,524
Total Loans	62,151	74,165
Multifamily Real Estate [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	0	0
Commercial Real Estate [Member] \| Owner Occupied [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	307	244
Collectively evaluated for impairment, allowance for loan losses	1,346	1,299
Total allowance for loan losses	1,653	1,543	1,509	1,501
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	3,314	2,801
Collectively evaluated for impairment, loan balances	131,226	124,556
Total Loans	136,048	129,370
Commercial Real Estate [Member] \| Owner Occupied [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	1,508	2,013
Commercial Real Estate [Member] \| Non-Owner Occupied [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	88	0
Collectively evaluated for impairment, allowance for loan losses	2,225	2,350
Total allowance for loan losses	2,313	2,350	2,070	2,316
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	11,578	2,373
Collectively evaluated for impairment, loan balances	219,124	213,067
Total Loans	230,702	220,836
Commercial Real Estate [Member] \| Non-Owner Occupied [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	0	5,396
Commercial and Industrial [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	104	266
Collectively evaluated for impairment, allowance for loan losses	897	864
Total allowance for loan losses	1,101	1,140	1,033	1,444
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	1,304	1,418
Collectively evaluated for impairment, loan balances	76,744	75,086
Total Loans	78,259	76,736
Commercial and Industrial [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	100	10
Loans Balances [Abstract]
Total Loans	211	232
Consumer [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	0	0
Collectively evaluated for impairment, allowance for loan losses	328	347
Total allowance for loan losses	328	347	307	243
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	0	0
Collectively evaluated for impairment, loan balances	28,293	30,916
Total Loans	28,293	30,916
Consumer [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	0	0
Construction and Land [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	685	86
Collectively evaluated for impairment, allowance for loan losses	1,723	1,311
Total allowance for loan losses	2,408	1,397	1,061	1,744
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	5,672	12,665
Collectively evaluated for impairment, loan balances	131,890	103,561
Total Loans	139,012	117,828
Construction and Land [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	1,450	1,602
All Other [Member]
Allowance for Loan Losses [Abstract]
Individually evaluated for impairment, allowance for loan losses	0	0
Collectively evaluated for impairment, allowance for loan losses	337	326
Total allowance for loan losses	337	326	$ 345	$ 702
Loans Balances [Abstract]
Individually evaluated for impairment, loan balances	293	311
Collectively evaluated for impairment, loan balances	35,179	31,908
Total Loans	35,758	32,678
All Other [Member] \| Acquired with Deteriorated Credit Quality [Member]
Allowance for Loan Losses [Abstract]
Total allowance for loan losses	0	0
Loans Balances [Abstract]
Total Loans	$ 286	$ 459