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STOCK COMPENSATION EXPENSE, Authorized Stock Options By Exercise Price Range (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Share-based Compensation, Shares Granted under Stock Option Plans, Exercise Price Range [Line Items]  
Outstanding, Number(in shares) 316,592us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 11.61us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
Outstanding, Aggregate Intrinsic Value $ 1,166us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Currently Exercisable, Number (in shares) 224,958us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
Currently Exercisable, Weighted Average Remaining Contractual Life 5 years 2 months 12 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 10.58us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
Currently Exercisable, Aggregate Intrinsic Value 1,063us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
$6.50 to $10.00 [Member]  
Share-based Compensation, Shares Granted under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower range limit (in dollars per share) $ 6.50us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Range of Exercise Prices, upper range limit (in dollars per share) $ 10.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Outstanding, Number(in shares) 113,482us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 7.56us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Outstanding, Aggregate Intrinsic Value 871us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Currently Exercisable, Number (in shares) 113,482us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Currently Exercisable, Weighted Average Remaining Contractual Life 6 years 2 months 12 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 7.56us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
Currently Exercisable, Aggregate Intrinsic Value 871us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member650To1000Member
$10.01 to $12.50 [Member]  
Share-based Compensation, Shares Granted under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower range limit (in dollars per share) $ 10.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Range of Exercise Prices, upper range limit (in dollars per share) $ 12.50us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Outstanding, Number(in shares) 40,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 11.39us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Outstanding, Aggregate Intrinsic Value 156us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Currently Exercisable, Number (in shares) 26,374us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Currently Exercisable, Weighted Average Remaining Contractual Life 8 years
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 11.39us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
Currently Exercisable, Aggregate Intrinsic Value 101us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1001To1250Member
$12.51 to $15.00 [Member]  
Share-based Compensation, Shares Granted under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower range limit (in dollars per share) $ 12.51us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Range of Exercise Prices, upper range limit (in dollars per share) $ 15.00us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Outstanding, Number(in shares) 139,110us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 14.22us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Outstanding, Aggregate Intrinsic Value 139us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Currently Exercisable, Number (in shares) 61,602us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Currently Exercisable, Weighted Average Remaining Contractual Life 4 years
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 13.75us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
Currently Exercisable, Aggregate Intrinsic Value 91us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1251To1500Member
$15.01 to $17.50 [Member]  
Share-based Compensation, Shares Granted under Stock Option Plans, Exercise Price Range [Line Items]  
Range of Exercise Prices, lower range limit (in dollars per share) $ 15.01us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeLowerRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Range of Exercise Prices, upper range limit (in dollars per share) $ 17.50us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeUpperRangeLimit
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Outstanding, Number(in shares) 23,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 16.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeOutstandingOptionsWeightedAverageExercisePriceBeginningBalance1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Outstanding, Aggregate Intrinsic Value 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Currently Exercisable, Number (in shares) 23,500us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Currently Exercisable, Weighted Average Remaining Contractual Life 0 years 10 months 24 days
Currently Exercisable, Weighted Average Exercise Price (in dollars per share) $ 16.00us-gaap_SharebasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeExercisableOptionsWeightedAverageExercisePrice1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member
Currently Exercisable, Aggregate Intrinsic Value $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1
/ us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis
= pfbi_Member1501To1750Member