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FAIR VALUE, Carrying Amount and Estimated Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Financial assets [Abstract]    
Securities available for sale $ 229,750us-gaap_AvailableForSaleSecurities $ 218,066us-gaap_AvailableForSaleSecurities
Carrying Amount [Member]    
Financial assets [Abstract]    
Cash and due from banks 70,398us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
63,984us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Federal funds sold 4,986us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
12,777us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Securities available for sale 229,750us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
218,066us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans held for sale 226us-gaap_LoansHeldForSaleFairValueDisclosure
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= us-gaap_CarryingReportedAmountFairValueDisclosureMember
77us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Loans, net 869,364us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
729,743us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Federal Home Loan Bank stock 2,996us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
4,183us-gaap_InvestmentInFederalHomeLoanBankStockFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest receivable 3,219us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
3,132us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Financial liabilities [Abstract]    
Deposits (1,075,243)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
(924,023)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Securities sold under agreements to repurchase (15,580)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
(11,319)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other borrowed funds (11,722)pfbi_OtherBorrowingsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
(13,800)pfbi_OtherBorrowingsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest payable (434)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
(383)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair Value [Member]    
Financial assets [Abstract]    
Cash and due from banks 70,398us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
63,984us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Federal funds sold 4,986us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
12,777us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities available for sale 229,750us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
218,066us-gaap_AvailableForSaleSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Loans held for sale 226us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
77us-gaap_LoansHeldForSaleFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Loans, net 870,273us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
725,588us-gaap_LoansReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Interest receivable 3,319us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
3,132us-gaap_AccountsReceivableFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial liabilities [Abstract]    
Deposits (1,074,599)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(925,139)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities sold under agreements to repurchase (15,580)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(11,319)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other borrowed funds (11,760)pfbi_OtherBorrowingsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(13,811)pfbi_OtherBorrowingsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Interest payable (434)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(383)us-gaap_AccruedLiabilitiesFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value [Member] | Level 1 [Member]    
Financial assets [Abstract]    
Cash and due from banks 70,398us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
63,984us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Federal funds sold 4,986us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
12,777us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities available for sale 0us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel1Member
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0us-gaap_AvailableForSaleSecurities
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Loans held for sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
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0us-gaap_LoansHeldForSaleFairValueDisclosure
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Loans, net 0us-gaap_LoansReceivableFairValueDisclosure
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0us-gaap_LoansReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Interest receivable 0us-gaap_AccountsReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
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0us-gaap_AccountsReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial liabilities [Abstract]    
Deposits (711,118)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(592,664)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Securities sold under agreements to repurchase 0us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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= us-gaap_FairValueInputsLevel1Member
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0us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other borrowed funds 0pfbi_OtherBorrowingsFairValueDisclosure
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0pfbi_OtherBorrowingsFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Interest payable (6)us-gaap_AccruedLiabilitiesFairValueDisclosure
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(5)us-gaap_AccruedLiabilitiesFairValueDisclosure
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= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value [Member] | Level 2 [Member]    
Financial assets [Abstract]    
Cash and due from banks 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Federal funds sold 0us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
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0us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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Securities available for sale 229,610us-gaap_AvailableForSaleSecurities
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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217,926us-gaap_AvailableForSaleSecurities
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Loans held for sale 0us-gaap_LoansHeldForSaleFairValueDisclosure
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0us-gaap_LoansHeldForSaleFairValueDisclosure
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Loans, net 0us-gaap_LoansReceivableFairValueDisclosure
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0us-gaap_LoansReceivableFairValueDisclosure
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Interest receivable 625us-gaap_AccountsReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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593us-gaap_AccountsReceivableFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Financial liabilities [Abstract]    
Deposits (363,481)us-gaap_DepositsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
(332,475)us-gaap_DepositsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FairValueByMeasurementBasisAxis
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Securities sold under agreements to repurchase (15,580)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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(11,319)us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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Other borrowed funds (11,760)pfbi_OtherBorrowingsFairValueDisclosure
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= us-gaap_FairValueInputsLevel2Member
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(13,811)pfbi_OtherBorrowingsFairValueDisclosure
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Interest payable (428)us-gaap_AccruedLiabilitiesFairValueDisclosure
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(378)us-gaap_AccruedLiabilitiesFairValueDisclosure
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Fair Value [Member] | Level 3 [Member]    
Financial assets [Abstract]    
Cash and due from banks 0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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= us-gaap_FairValueInputsLevel3Member
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0us-gaap_CashAndCashEquivalentsFairValueDisclosure
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Federal funds sold 0us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
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0us-gaap_FederalFundsSoldAndSecuritiesBorrowedOrPurchasedUnderAgreementsToResellFairValueDisclosure
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Securities available for sale 140us-gaap_AvailableForSaleSecurities
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140us-gaap_AvailableForSaleSecurities
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Loans held for sale 226us-gaap_LoansHeldForSaleFairValueDisclosure
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77us-gaap_LoansHeldForSaleFairValueDisclosure
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Loans, net 870,273us-gaap_LoansReceivableFairValueDisclosure
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725,588us-gaap_LoansReceivableFairValueDisclosure
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Interest receivable 2,594us-gaap_AccountsReceivableFairValueDisclosure
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2,539us-gaap_AccountsReceivableFairValueDisclosure
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Financial liabilities [Abstract]    
Deposits 0us-gaap_DepositsFairValueDisclosure
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Securities sold under agreements to repurchase 0us-gaap_SecuritiesLoanedOrSoldUnderAgreementsToRepurchaseFairValueDisclosure
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Other borrowed funds 0pfbi_OtherBorrowingsFairValueDisclosure
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Interest payable $ 0us-gaap_AccruedLiabilitiesFairValueDisclosure
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$ 0us-gaap_AccruedLiabilitiesFairValueDisclosure
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