FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income:
Interest income on money market investments	$ 26,491	$ 18,192	$ 49,738	$ 32,512
Expense:
Income tax expense	34,103	40,092	77,128	68,114
Net income	74,695	70,558	157,295	131,708
Other comprehensive (loss) income, net of tax	(175,923)	28,496	(507,757)	(70,433)
Comprehensive income	(101,228)	99,054	(350,462)	61,275
Holding Company [Member]
Income:
Interest income on money market investments	10	8	14	24
Other Interest And Dividend Income	51	39	91	77
Total interest income and dividends on investments	178,740	16,375	242,377	35,230
Expense:
Other borrowings	1,698	1,285	3,031	2,579
Other operating expenses	434	637	873	1,136
Total operating expenses	2,132	1,922	3,904	3,715
Income before income taxes and equity in undistributed earnings of subsidiaries	176,608	14,453	238,473	31,515
Income tax expense	793	659	1,899	1,788
(Distributions in excess of earnigs) equity in undistributed earnings of subsidiaries	(101,120)	56,764	(79,279)	101,981
Net income	74,695	70,558	157,295	131,708
Other comprehensive (loss) income, net of tax	(175,923)	28,496	(507,757)	(70,433)
Comprehensive income	(101,228)	99,054	(350,462)	61,275
Investment In Banking Subsidiary [Member] | Holding Company [Member]
Income:
Dividend income	$ 178,679	$ 16,328	$ 242,272	$ 35,129