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Loans and Asset Quality Information (Schedule of Covered Purchased Nonimpaired Loans) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Covered purchased nonimpaired loans:    
Carrying amount of nonimpaired covered loans, beginning balance $ 125,644fbp_NonimpairedPurchasedLoansCarryingValue $ 207,167fbp_NonimpairedPurchasedLoansCarryingValue
Principal repayments (8,942)fbp_PrincipalRepayments (50,183)fbp_PrincipalRepayments
Transfers to foreclosed real estate (505)fbp_TransfersToForeclosedRealEstate (5,061)fbp_TransfersToForeclosedRealEstate
Transfers to non-covered loans due to expiration of loss-share agreement   (38,987)fbp_TransfersToNonCoveredLoans
Net loan (charge-offs) / recoveries 213fbp_LoanChargeoffs (3,301)fbp_LoanChargeoffs
Accretion of loan discount 1,557fbp_AccretionOfLoanDiscount 16,009fbp_AccretionOfLoanDiscount
Balance, ending, carrying value $ 117,967fbp_NonimpairedPurchasedLoansCarryingValue $ 125,644fbp_NonimpairedPurchasedLoansCarryingValue