FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income:
Interest income on investment securities	$ 11,894	$ 12,805	$ 40,065	$ 40,378
Other Interest And Dividend Income	662	410	3,006	1,457
Expense:
Impairement on equity securities	6,096	0	6,104	0
Gains Losses On Extinguishment Of Debt	0	0	4,217	0
Loss before income taxes and equity in undistributed earnings (losses) of subsidiaries	34,518	19,234	93,061	8,994
Income tax expense	(10,444)	(4,476)	(23,690)	(2,664)
Net income	24,074	14,758	69,371	6,330
Other comprehensive income (loss), net of tax	(12,157)	16,709	32,109	13,681
Comprehensive (loss) income	11,917	31,467	101,480	20,011
Holding Company [Member]
Income:
Other Interest And Dividend Income	5	5	15	15
Dividend Income From Subsidiaries	1,822	0	39,980	0
Other income	58	58	181	439
Total interest income	1,885	63	40,176	454
Expense:
Notes payable and other borrowings	1,817	1,861	5,777	5,521
Other operating expenses	685	643	2,313	2,000
Total operating expenses	2,502	2,504	8,090	7,521
Gains Losses On Extinguishment Of Debt	0	0	4,217	0
Loss before income taxes and equity in undistributed earnings (losses) of subsidiaries	(617)	(2,441)	36,303	(7,067)
Equity in undistributed earnings (losses) of subsidiaries	24,691	17,199	33,068	13,397
Net income	24,074	14,758	69,371	6,330
Other comprehensive income (loss), net of tax	(12,157)	16,709	32,109	13,681
Comprehensive (loss) income	$ 11,917	$ 31,467	$ 101,480	$ 20,011