BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
Mar. 31, 2026
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Principles of consolidation [Policy Text Block]	The Consolidated Financial Statements (unaudited) for the quarter ended March 31, 2026 (the “unaudited consolidated financial statements”) of First BanCorp. (the “Corporation”) have been prepared in conformity with the accounting policies stated in the Corporation’s Audited Consolidated Financial Statements for the fiscal year ended December 31, 2025 (the “audited consolidated financial statements”) included in the 2025 Annual Report on Form 10-K, as updated by the information contained in this report. Certain information and note disclosures normally included in the financial statements prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) have been condensed or omitted from these statements pursuant to the rules and regulations of the SEC and, accordingly, these financial statements should be read in conjunction with the audited consolidated financial statements, which are included in the 2025 Annual Report on Form 10-K. All adjustments (consisting only of normal recurring adjustments) that are, in the opinion of management, necessary for a fair presentation of the statement of financial position, results of operations and cash flows for the interim periods have been reflected. All significant intercompany accounts and transactions have been eliminated in consolidation. The Corporation evaluates subsequent events through the date of filing with the SEC.
Adoption of New Accounting Requirements And Recently Issued Accounting Standards Not Yet Effective or Not Yet Adopted [Policy Text Block]	Adoption of New Accounting Requirements Standard Description Effective Date Effect on the financial statements ASU 2025-05, “Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets” In July 2025, the FASB issued ASU 2025- 05, which provides a practical expedient for current accounts receivable and current contract assets accounted for pursuant to ASC Topic 606. Such practical expedient, if elected, allows an entity to assume that current economic conditions as of the reporting date remain unchanged over their remaining lives. Effective for annual reporting periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. Prospective application is required. Although ASU 2025-05 became effective during the first quarter of 2026, the adoption of this ASU did not have an impact on the Corporation’s financial position or results of operations, as the Corporation did not elect the practical expedient provided therein. Recently Issued Accounting Standards Not Yet Effective or Not Yet Adopted For issued accounting standards not yet effective or not yet adopted, see Note 1 – “Nature of Business and Summary of Significant Accounting Policies,” to the audited consolidated financial statements included in the 2025 Annual Report on Form 10-K.

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2026

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES [Abstract]

Principles of consolidation [Policy Text Block]

The

Consolidated

Financial

Statements

(unaudited)

for

the

quarter

ended

March

31,

2026

(the

“unaudited

consolidated

financial

statements”)

First

BanCorp.

(the

“Corporation”)

have

been

prepared

conformity

with

the

accounting

policies

stated

the

Corporation’s Audited Consolidated Financial Statements for the fiscal year ended December

31, 2025 (the “audited consolidated financial

statements”) included in the 2025 Annual Report on Form 10-K, as updated by the information contained in this report. Certain information

and note disclosures normally included in

the financial statements prepared in

accordance with generally accepted accounting

principles in

the United States of America (“GAAP”) have been

condensed or omitted from these statements pursuant to the

rules and regulations of the

SEC and,

accordingly, these

financial statements

should be

read in

conjunction with

the audited

consolidated financial

statements, which

are included

in the 2025

Annual Report on

Form 10-K. All

adjustments (consisting

only of normal

recurring adjustments) that

are, in the

opinion of management, necessary for

a fair presentation of the

statement of financial position, results of

operations and cash flows for

the

interim periods

have

been reflected.

All

significant

intercompany

accounts

and

transactions

have

been

eliminated

in consolidation.

The

Corporation evaluates subsequent events through the date of

filing with the SEC.

Adoption of New Accounting Requirements And Recently Issued Accounting Standards Not Yet Effective or Not Yet Adopted [Policy Text Block]

Adoption of New Accounting Requirements

Standard

Description

Effective Date

Effect on the financial statements

ASU 2025-05, “Financial

Instruments – Credit Losses

(Topic 326): Measurement

of Credit Losses for

Accounts Receivable and

Contract Assets”

In July 2025, the FASB issued ASU 2025-

05, which provides a practical expedient for

current accounts receivable and current

contract assets accounted for pursuant to

ASC Topic 606. Such practical expedient, if

elected, allows an entity to assume that

current economic conditions as of the

reporting date remain unchanged over their

remaining lives.

Effective for annual reporting

periods beginning after December

15, 2025, and interim reporting

periods within those annual

reporting periods. Prospective

application is required.

Although ASU 2025-05 became

effective during the first quarter of

2026, the adoption of this ASU did

not have an impact on the

Corporation’s financial position or

results of operations, as the

Corporation did not elect the

practical expedient provided therein.

Recently Issued Accounting Standards Not Yet

Effective or Not Yet

Adopted

For issued accounting

standards not yet effective

or not yet adopted,

see Note 1 –

“Nature of Business and

Summary of Significant

Accounting Policies,” to the audited consolidated financial statements included

in the 2025 Annual Report on Form 10-K.