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Goodwill and Other Intangible Assets (Summary of the Gross Carrying Amount and Accumulated Amortization of Intangible Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortizable intangible assets:    
Customer lists $ 678us-gaap_FiniteLivedCustomerListsGross $ 678us-gaap_FiniteLivedCustomerListsGross
Customer Lists Accumulated Amortization 505fbp_CustomerListsAccumulatedAmortization 462fbp_CustomerListsAccumulatedAmortization
Core deposit premiums 8,560us-gaap_FiniteLivedCoreDepositsGross 8,560us-gaap_FiniteLivedCoreDepositsGross
Core Deposit premiums accumulated amortization 6,675fbp_CoreDepositPremiumsAccumulatedAmortization 5,942fbp_CoreDepositPremiumsAccumulatedAmortization
Gross Carrying Amount 9,238us-gaap_FiniteLivedIntangibleAssetsGross 9,238us-gaap_FiniteLivedIntangibleAssetsGross
Accumulated Amortization 7,180us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 6,404us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Unamortizable intangible assets:    
Goodwill $ 65,835us-gaap_Goodwill $ 65,835us-gaap_Goodwill