FAIR VALUE, Assets and Liabilities Measured at Fair Value on Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Impaired Loans Additional Disclosure [Abstract]
Recorded investment in impaired loans carried at fair value	$ 7,934		$ 12,301
Valuation allowance for impaired loans	1,402		2,492
Impaired collateral dependent loans, provision for loan losses	(1,437)	845
Other Real Estate Owned Additional Disclosure [Abstract]
Recorded investment in other real estate owned carried at fair value - gross	11,395		11,163
Valuation allowance for other real estate owned	2,377		2,377
Write downs	0	0
Nonrecurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Impaired loans: [Abstract]
Residential Real Estate	0		0
Owner Occupied Commercial Real Estate	0		0
Non-owner Occupied Commercial Real Estate			0
Commercial and Industrial	0		0
All Other	0		0
Total impaired loans	0		0
Other real estate owned: [Abstract]
Non-owner Occupied Commercial Real Estate	0		0
All Other	0		0
Total OREO	0		0
Nonrecurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Impaired loans: [Abstract]
Residential Real Estate	0		0
Owner Occupied Commercial Real Estate	0		0
Non-owner Occupied Commercial Real Estate			0
Commercial and Industrial	0		0
All Other	0		0
Total impaired loans	0		0
Other real estate owned: [Abstract]
Non-owner Occupied Commercial Real Estate	0		0
All Other	0		0
Total OREO	0		0
Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Impaired loans: [Abstract]
Residential Real Estate	1,085		1,518
Owner Occupied Commercial Real Estate	546		346
Non-owner Occupied Commercial Real Estate			428
Commercial and Industrial	745		3,384
All Other	4,156		4,133
Total impaired loans	6,532		9,809
Other real estate owned: [Abstract]
Non-owner Occupied Commercial Real Estate	290		290
All Other	8,728		8,496
Total OREO	9,018		8,786
Nonrecurring [Member] \| Carrying Amount [Member]
Impaired loans: [Abstract]
Residential Real Estate	1,085		1,518
Owner Occupied Commercial Real Estate	546		346
Non-owner Occupied Commercial Real Estate			428
Commercial and Industrial	745		3,384
All Other	4,156		4,133
Total impaired loans	6,532		9,809
Other real estate owned: [Abstract]
Non-owner Occupied Commercial Real Estate	290		290
All Other	8,728		8,496
Total OREO	$ 9,018		$ 8,786

Fair value disclosure of impaired all other loans not specifically classified in the financial statement.

No definition available.

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- Definition

Fair value disclosure of all other real estate owned that are not specifically classified in the financial statements.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of impaired commercial and industrial real estate loans.

+ References

No definition available.

+ Details

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- Definition

The provisions for loan losses on impaired collateral dependent loans.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of non-owner occupied commercial real estate loans.

+ References

No definition available.

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- Definition

Fair value disclosure of other non-owner occupied commercial real estate loans owned.

+ References

No definition available.

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

+ Details

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- Definition

Fair value disclosure of owner occupied commercial real estate loans.

+ References

No definition available.

+ Details

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- Definition

Recorded investment in impaired loans carried at fair value.

+ References

No definition available.

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- Definition

Recorded investment in other real estate owned carried at fair value.

+ References

No definition available.

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- Definition

Fair value disclosure of impaired residential real estate loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	pfbi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a nonrecurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ References

No definition available.

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

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- Definition

For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(4))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 4

-Article 9

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- Definition

Amount of the increase in the real estate owned valuation allowance that is charged against earnings in the period.

+ References

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