MONEY MARKET INVESTMENTS - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Money Market Investments [Abstract]
Cash pledged as collateral	$ 200fbp_CashPledgedAsCollateral	$ 200fbp_CashPledgedAsCollateral

Carrying amount as of the balance sheet date of cash and cash equivalents that have been pledged as collateral for borrowings.

No definition available.

Name:	fbp_CashPledgedAsCollateral
Namespace Prefix:	fbp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant