FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income:
Interest income on money market investments	$ 102,922	$ 72,893	$ 58,547
Expense:
Gain on early extinguishment of debt	0	0	94
Income tax expense	142,512	146,792	14,050
Net income	305,072	281,025	102,273
Other comprehensive (loss) income, net of tax	(720,779)	(139,454)	48,691
Comprehensive income	(415,707)	141,571	150,964
Holding Company [Member]
Income:
Interest income on money market investments	79	51	71
Other income	248	154	439
Total income	368,997	128,265	53,217
Expense:
Other borrowings	8,253	5,135	6,355
Other operating expenses	1,730	1,929	2,097
Total expenses	9,983	7,064	8,452
Gain on early extinguishment of debt	0	0	94
Income before income taxes and equity in undistributed earnings of subsidiaries	359,014	121,201	44,859
Income tax expense	3,448	2,854	2,429
Equity in undistributed earnings of subsidiaries (distributions in excess of earnigs)	(50,494)	162,678	59,843
Net income	305,072	281,025	102,273
Other comprehensive (loss) income, net of tax	(720,779)	(139,454)	48,691
Comprehensive income	(415,707)	141,571	150,964
Investment In Banking Subsidiary [Member] | Holding Company [Member]
Income:
Dividend income	368,670	98,060	52,707
Non-Banking Subsidiaries [Member] | Holding Company [Member]
Income:
Dividend income	$ 0	$ 30,000	$ 0