FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income:
Interest income on money market investments	$ 72,893	$ 58,547	$ 59,546
Total interest income and dividends on investments	75,555	61,935	72,899
Expense:
Gain on early extinguishment of debt	0	94	0
Total income tax provision	146,792	14,050	71,995
Net income	281,025	102,273	167,377
Other comprehensive (loss) income, net of tax	(139,454)	48,691	47,179
Comprehensive income	141,571	150,964	214,556
Holding Company [Member]
Income:
Interest income on money market investments	51	71	233
Other Interest And Dividend Income	154	439	283
Total interest income and dividends on investments	128,265	53,217	42,759
Expense:
Other borrowings	5,135	6,355	9,424
Other operating expenses	1,929	2,097	2,131
Total operating expenses	7,064	8,452	11,555
Gain on early extinguishment of debt	0	94	0
Income before income taxes and equity in undistributed earnings of subsidiaries	121,201	44,859	31,204
Total income tax provision	2,854	2,429	2,752
Equity in undistributed earnings of subsidiaries	162,678	59,843	138,925
Net income	281,025	102,273	167,377
Other comprehensive (loss) income, net of tax	(139,454)	48,691	47,179
Comprehensive income	141,571	150,964	214,556
Investment In Banking Subsidiary [Member] | Holding Company [Member]
Income:
Dividend income	98,060	52,707	42,243
Non-Banking Subsidiaries [Member] | Holding Company [Member]
Income:
Dividend income	$ 30,000	$ 0	$ 0