Loans (Changes In Allowance For Loan And Lease Losses By Loan Category) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	$ 3,638	$ 3,881
Charge-offs	(1,361)	(1,504)
Recoveries	23	59
Provision (credit)	2,100	1,202
Ending balance	4,400	3,638
Ending balance: Individually evaluated for impairment	149	311
Ending balance: Collectively evaluated for impairment	4,251	3,327
Loans [Abstract]
Loans: Ending Balance	1,078,077	874,593
Ending balance: Individually evaluated for impairment	2,428	2,450
Ending balance: Collectively evaluated for impairment	1,075,649	872,143
SBA Non Real Estate [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	385	419
Charge-offs	(111)	(307)
Recoveries		12
Provision (credit)	570	261
Ending balance	844	385
Ending balance: Individually evaluated for impairment	123	40
Ending balance: Collectively evaluated for impairment	721	345
Loans [Abstract]
Loans: Ending Balance	68,887	62,425
Ending balance: Individually evaluated for impairment	904	197
Ending balance: Collectively evaluated for impairment	67,983	62,228
SBA Commercial Mortgage [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	461	496
Provision (credit)	(53)	(35)
Ending balance	408	461
Ending balance: Collectively evaluated for impairment	408	461
Loans [Abstract]
Loans: Ending Balance	114,029	82,317
Ending balance: Collectively evaluated for impairment	114,029	82,317
SBA Construction [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	114
Provision (credit)	(66)	114
Ending balance	48	114
Ending balance: Collectively evaluated for impairment	48	114
Loans [Abstract]
Loans: Ending Balance	6,977	20,392
Ending balance: Collectively evaluated for impairment	6,977	20,392
Direct Lease Financing [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	836	311
Charge-offs	(30)	(323)
Recoveries		25
Provision (credit)	216	823
Ending balance	1,022	836
Ending balance: Collectively evaluated for impairment	1,022	836
Loans [Abstract]
Loans: Ending Balance	231,514	194,464
Ending balance: Collectively evaluated for impairment	231,514	194,464
SBLOC [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	562	293
Charge-offs		(3)
Provision (credit)	200	272
Ending balance	762	562
Ending balance: Collectively evaluated for impairment	762	562
Loans [Abstract]
Loans: Ending Balance	575,948	421,862
Ending balance: Collectively evaluated for impairment	575,948	421,862
Other Specialty Lending [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	66	1
Provision (credit)	133	65
Ending balance	199	66
Ending balance: Collectively evaluated for impairment	199	66
Loans [Abstract]
Loans: Ending Balance	48,315	48,625
Ending balance: Collectively evaluated for impairment	48,315	48,625
Consumer [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	1,181	2,361
Charge-offs	(1,220)	(871)
Recoveries	23	22
Provision (credit)	952	(331)
Ending balance	936	1,181
Ending balance: Individually evaluated for impairment	26	271
Ending balance: Collectively evaluated for impairment	910	910
Loans [Abstract]
Loans: Ending Balance	23,180	36,168
Ending balance: Individually evaluated for impairment	1,524	2,253
Ending balance: Collectively evaluated for impairment	21,656	33,915
Unallocated [Member]
Changes in allowance for loan and lease losses by loan category [Abstract]
Beginning balance	33
Provision (credit)	148	33
Ending balance	181	33
Ending balance: Collectively evaluated for impairment	181	33
Loans [Abstract]
Loans: Ending Balance	9,227	8,340
Ending balance: Collectively evaluated for impairment	$ 9,227	$ 8,340

No definition available.

Name:	pfb_FinancingReceivableAbstract
Namespace Prefix:	pfb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

+ Details

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

- 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

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesRecovery
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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 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=28367877&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=35738203&loc=d3e5074-111524

+ Details

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

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ 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 (c)(2)
-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 11
-Article 9

+ Details

Name:	us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_SbaNonRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_SbaCommercialMortgageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_SbaConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_FinanceLeasesFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_SecuritiesBackedLineOfCreditFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_OtherSpecialtyLendingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=pfb_ConsumerFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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