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Loans (Loans Modified As Troubled Debt Restructurings) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Modifications [Line Items]
Extended maturity	$ 144	$ 144
Combined rate and maturity	1,695	1,722
SBA Non Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Extended maturity	144	144
Combined rate and maturity	869	700
Direct Lease Financing [Member]
Financing Receivable, Modifications [Line Items]
Combined rate and maturity	285	734
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Combined rate and maturity	$ 541	$ 288

X

- Definition

This line item represents amount of combined adjusted interest rate and extended maturity (after modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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

X

- Definition

This line item represents amount of extended maturity (after modification) modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: