FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Income (Unaudited) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income:
Interest income on money market investments	$ 15,876	$ 16,018
Other income	2,262	2,829
Expense:
Income tax provision	(2,967)	17,618
Net income	2,266	43,314
Other comprehensive income, net of tax	42,352	20,510
Comprehensive income	44,618	63,824
Holding Company [Member]
Income:
Interest income on money market investments	33	105
Other income	61	75
Total interest income and dividends on investments	13,723	9,680
Expense:
Other borrowings	2,032	2,466
Other operating expenses	523	556
Total operating expenses	2,555	3,022
Income before income taxes and equity in undistributed (losses) earnings of subsidiaries	11,168	6,658
Income tax provision	1,382	1,339
Equity in undistributed (losses) earnings of subsidiaries	(7,520)	37,995
Net income	2,266	43,314
Other comprehensive income, net of tax	42,352	20,510
Comprehensive income	44,618	63,824
Investment In Banking Subsidiary [Member] | Holding Company [Member]
Income:
Dividend income	$ 13,629	$ 9,500