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FDIC Indemnification Asset (Schedule of FDIC Indemnification Asset Components) (Details) (USD $)
Mar. 31, 2015
item
Dec. 31, 2014
Mar. 31, 2014
FDIC indemnification asset components      
Receivable related to loss claims incurred, not yet reimbursed $ 4,884,000fbp_ReceivableRelatedToClaimsSubmittedNotYetReceived $ 6,899,000fbp_ReceivableRelatedToClaimsSubmittedNotYetReceived $ 7,101,000fbp_ReceivableRelatedToClaimsSubmittedNotYetReceived
Receivable related to estimated future claims on loans 12,886,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnLoans 14,933,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnLoans 24,764,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnLoans
Receivable related to estimated future claims on foreclosed real estate 682,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnOtherRealEstateOwned 737,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnOtherRealEstateOwned 3,639,000fbp_ReceivableRelatedToEstimatedFutureClaimsOnOtherRealEstateOwned
FDIC indemnification asset 18,452,000us-gaap_FDICIndemnificationAsset 22,569,000us-gaap_FDICIndemnificationAsset 35,504,000us-gaap_FDICIndemnificationAsset
Receivable related to claims involving the same borrower for which the FDIC has denied the claims $ 1,200,000fbp_ReceivableRelatedToClaimsInvolvingSameBorrowerForWhichFDICDeniedClaims    
Number of claims involving the same borrower for which the FDIC has denied the claims 2fbp_NumberOfClaimsInvolvingTheSameBorrowerForWhichTheFdicHasDeniedTheClaims