FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
ASSETS
Cash and due from banks	$ 822,542	$ 478,480	$ 1,694,066
Other assets	299,446	305,633
Total assets	18,977,114	18,634,484
Liabilities:
Long-term borrowings	183,762	183,762
Accounts payable and other liabilities	237,812	231,582
Liabilities	17,571,521	17,308,944
Stockholders Equity	1,405,593	1,325,540	$ 1,781,102
Total liabilities and stockholders' equity	18,977,114	18,634,484
Holding Company [Member]
ASSETS
Cash and due from banks	13,981	19,279
Other investment securities	735	735
Dividends receivable	637	624
Other assets	426	430
Total assets	1,598,539	1,519,376
Liabilities:
Long-term borrowings	183,762	183,762
Accounts payable and other liabilities	9,184	10,074
Liabilities	192,946	193,836
Stockholders Equity	1,405,593	1,325,540
Total liabilities and stockholders' equity	1,598,539	1,519,376
Holding Company [Member] | Firstbank Puerto Rico [Member]
ASSETS
Equity Method Investments	1,544,874	1,464,026
Holding Company [Member] | FirstBank Insurance Agency
ASSETS
Equity Method Investments	32,374	28,770
Holding Company [Member] | FBP Statutory Trust I [Member]
ASSETS
Equity Method Investments	1,951	1,951
Holding Company [Member] | FBP Statutory Trust II [Member]
ASSETS
Equity Method Investments	$ 3,561	$ 3,561