Financial Instruments With Off-Balance-Sheet Risk And Concentrations Of Credit Risk (Narrative) (Details)	Dec. 31, 2015 USD ($)
Financial Instruments With Off-Balance-Sheet Risk And Concentrations Of Credit Risk [Abstract]
Standby letters of credit expire in 2015	$ 250,000
Standby letters of credit expire in 2016	16,900,000
Standby letters of credit expire in 2017	$ 1,400,000

Credit Commitment Amount Expire In Next Twelve Months

No definition available.

Name:	pfb_CreditCommitmentAmountExpireInNextTwelveMonths
Namespace Prefix:	pfb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant