FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
ASSETS
Cash and due from banks	$ 2,540,376	$ 1,433,261	$ 546,391
Money market investments	2,682	60,572	97,708
Other assets	234,143	272,737
Total assets	20,785,275	18,793,071
Liabilities:
Other borrowings	183,762	183,762
Accounts payable and other liabilities	214,852	276,747
Liabilities	18,683,508	16,517,892
Stockholders Equity	2,101,767	2,275,179	2,228,073
Total liabilities and stockholders' equity	20,785,275	18,793,071
Holding Company [Member]
ASSETS
Cash and due from banks	20,751	10,909
Money market investments	0	6,211	$ 6,211
Other investment securities	285	285
Other assets	366	2,023
Total assets	2,293,724	2,463,216
Liabilities:
Other borrowings	183,762	183,762
Accounts payable and other liabilities	8,195	4,275
Liabilities	191,957	188,037
Stockholders Equity	2,101,767	2,275,179
Total liabilities and stockholders' equity	2,293,724	2,463,216
Holding Company [Member] | Firstbank Puerto Rico [Member]
ASSETS
Equity Method Investments	2,247,289	2,396,963
Holding Company [Member] | FirstBank Insurance Agency
ASSETS
Equity Method Investments	19,521	41,313
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