STOCK COMPENSATION EXPENSE, Authorized Stock Options By Exercise Price Range (Details) $ / shares in Units, $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) $ / shares shares
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Outstanding, Number (in shares) \| shares	332,641
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 12.54
Outstanding, Aggregate Intrinsic Value \| $	$ 1,862
Currently Exercisable, Number (in shares) \| shares	200,123
Currently Exercisable, Weighted Average Remaining Contractual Life	6 years 6 months
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.67
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 1,495
$4.00 to $6.00 [Member]
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit (in dollars per share)	$ 4.00
Range of Exercise Prices, upper range limit (in dollars per share)	$ 6.00
Outstanding, Number (in shares) \| shares	32,276
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 5.28
Outstanding, Aggregate Intrinsic Value \| $	$ 415
Currently Exercisable, Number (in shares) \| shares	32,276
Currently Exercisable, Weighted Average Remaining Contractual Life	1 year 9 months 18 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 5.28
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 415
$6.01 to $8.00 [Member]
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit (in dollars per share)	$ 6.01
Range of Exercise Prices, upper range limit (in dollars per share)	$ 8.00
Outstanding, Number (in shares) \| shares	4,814
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 6.47
Outstanding, Aggregate Intrinsic Value \| $	$ 56
Currently Exercisable, Number (in shares) \| shares	4,814
Currently Exercisable, Weighted Average Remaining Contractual Life	2 months 12 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 6.47
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 56
$8.01 to $10.00 [Member]
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit (in dollars per share)	$ 8.01
Range of Exercise Prices, upper range limit (in dollars per share)	$ 10.00
Outstanding, Number (in shares) \| shares	15,715
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.28
Outstanding, Aggregate Intrinsic Value \| $	$ 155
Currently Exercisable, Number (in shares) \| shares	15,715
Currently Exercisable, Weighted Average Remaining Contractual Life	3 years 2 months 12 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.28
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 155
$10.01 to $12.00 [Member]
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit (in dollars per share)	$ 10.01
Range of Exercise Prices, upper range limit (in dollars per share)	$ 12.00
Outstanding, Number (in shares) \| shares	96,595
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 10.70
Outstanding, Aggregate Intrinsic Value \| $	$ 719
Currently Exercisable, Number (in shares) \| shares	96,595
Currently Exercisable, Weighted Average Remaining Contractual Life	5 years 3 months 18 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 10.70
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 719
$12.01 to $16.00 [Member]
Additional Information Regarding Stock Options Outstanding and Exercisable [Abstract]
Range of Exercise Prices, lower range limit (in dollars per share)	$ 12.01
Range of Exercise Prices, upper range limit (in dollars per share)	$ 16.00
Outstanding, Number (in shares) \| shares	183,241
Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 15.32
Outstanding, Aggregate Intrinsic Value \| $	$ 517
Currently Exercisable, Number (in shares) \| shares	50,723
Currently Exercisable, Weighted Average Remaining Contractual Life	8 years 3 months 18 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 15.18
Currently Exercisable, Aggregate Intrinsic Value \| $	$ 150

Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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

- References

No definition available.

+ Details

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

- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

+ References

+ Details

Name:	us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Weighted average remaining contractual term of exercisable stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (e)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageRemainingContractualTerm2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

Name:	us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=pfbi_ExercisePriceRangeOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=pfbi_ExercisePriceRangeTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=pfbi_ExercisePriceRangeThreeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=pfbi_ExercisePriceRangeFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=pfbi_ExercisePriceRangeFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: