FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Loss (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income:
Interest income on investment securities	$ 12,604	$ 15,228
Other Interest And Dividend Income	537	500
Expense:
Loss before income taxes and equity in undistributed earnings (losses) of subsidiaries	33,678	17,970
Income tax expense	(8,032)	(887)
Net income (loss)	25,646	17,083
Other comprehensive income (loss), net of tax	7,140	22,539
Comprehensive (loss) income	32,786	39,622
Holding Company [Member]
Income:
Other Interest And Dividend Income	5	5
Other income	56	53
Total interest income	61	58
Expense:
Notes payable and other borrowings	1,817	1,760
Other operating expenses	604	506
Total operating expenses	2,421	2,266
Loss before income taxes and equity in undistributed earnings (losses) of subsidiaries	(2,360)	(2,208)
Income tax expense	0	(2)
Equity in undistributed earnings (losses) of subsidiaries	28,006	19,293
Net income (loss)	25,646	17,083
Other comprehensive income (loss), net of tax	7,140	22,539
Comprehensive (loss) income	$ 32,786	$ 39,622