FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Financial Condition (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
ASSETS
Cash and due from banks	$ 1,261,590	$ 2,540,376	$ 2,786,066
Money market investments	1,933	2,682	2,703
Other assets	246,848	234,143
Total assets	19,531,635	20,785,275
Liabilities:
Other borrowings	183,762	183,762
Accounts payable and other liabilities	249,829	214,852
Liabilities	17,973,719	18,683,508
Stockholders Equity	1,557,916	2,101,767	$ 2,204,955
Total liabilities and stockholders' equity	19,531,635	20,785,275
Holding Company [Member]
ASSETS
Cash and due from banks	18,387	20,751
Other investment securities	285	285
Other assets	210	71
Dividends Receivable	50,797	295
Total assets	1,749,470	2,293,724
Liabilities:
Other borrowings	183,762	183,762
Accounts payable and other liabilities	7,792	8,195
Liabilities	191,554	191,957
Stockholders Equity	1,557,916	2,101,767
Total liabilities and stockholders' equity	1,749,470	2,293,724
Holding Company [Member] | Firstbank Puerto Rico [Member]
ASSETS
Equity Method Investments	1,648,605	2,247,289
Holding Company [Member] | FirstBank Insurance Agency
ASSETS
Equity Method Investments	25,674	19,521
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