FIRST BANCORP. (Holding Company Only) Financial Information - Statement of Cash Flows (Detail) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2022
Cash flows from operating activities:
Net Income Loss	$ 302,864	$ 305,072	$ 281,025
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	7,799	5,407	5,460
Gain on early extinguishment of debt	(1,605)	0	0
Net (increase) decrease in other assets	(16,619)	(2,437)	24,344
Net increase in other liabilities	(41,290)	20,437	(12,506)
Net cash provided by operating activities	362,963	440,485	399,721
Cash flows from investing activities:
Net cash used in investing activities	(78,450)	(681,460)	(1,262,975)
Cash flows from financing activities:
Repurchase of common stock	(203,241)	(277,769)	(216,522)
Dividends paid on common stock	(99,666)	(87,824)	(65,021)
Dividends paid on preferred stock	0	0	(2,453)
Redemption of preferred stock - Series A through E	0	0	(36,104)
Net cash (used in) provided by financing activities	(101,854)	(1,821,578)	1,912,479
Net (decrease) increase in cash and cash equivalents	182,659	(2,062,553)	1,049,225
Cash and cash equivalents at beginning of year	480,505	2,543,058	1,493,833
Cash and cash equivalents at end of period	663,164	480,505	2,543,058
Cash and cash equivalents include:
Money market investments	1,239	2,025	2,682	$ 2,025
Holding Company [Member]
Cash flows from operating activities:
Net Income Loss	302,864	305,072	281,025
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	145	148	149
Equity in undistributed earnings of subsidiaries	12,580	50,494	(162,678)
Gain on early extinguishment of debt	(1,605)	0	0
Net (increase) decrease in other assets	(146)	(688)	1,657
Net increase in other liabilities	1,127	1,545	3,578
Net cash provided by operating activities	314,965	356,571	123,731
Cash flows from investing activities:
Purchase of equity securities	(90)	(450)	0
Return of capital from wholly-owned subsidiaries	0	8,000	200,000
Net cash used in investing activities	(90)	7,550	200,000
Cash flows from financing activities:
Repurchase of common stock	(203,241)	(277,769)	(216,522)
Repayment of junior subordinated debentures	(19,795)	0	0
Dividends paid on common stock	(99,666)	(87,824)	(65,021)
Dividends paid on preferred stock	0	0	(2,453)
Redemption of preferred stock - Series A through E	0	0	(36,104)
Net cash (used in) provided by financing activities	(322,702)	(365,593)	(320,100)
Net (decrease) increase in cash and cash equivalents	(7,827)	(1,472)	3,631
Cash and cash equivalents at beginning of year	19,279	20,751	17,120
Cash and cash equivalents at end of period	11,452	19,279	20,751
Cash and cash equivalents include:
Cash and due from banks	11,452	19,279	20,751
Money market investments	$ 0	0	0
Subsidiaries [Member]
Cash flows from financing activities:
Redemption of preferred stock - Series A through E		$ (8,000)	$ (200,000)
Cash and cash equivalents include:
Number of redeemed preferred stock		0.3	8.0