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FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Loss (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income: |  |  |  |
Money market investments |  | $ 4,614 | $ 3,365 | $ 2,148
Interest income on investment securities |  | 51,125 | 50,905 | 54,850
Total interest and dividends on investments |  | 55,739 | 54,270 | 56,998
Expense: |  |  |  |
Gains Losses On Extinguishment Of Debt | $ 2,300 | 1,391 | 4,217 | 0
Segment income |  | 167,407 | 231,385 | 118,146
Income tax benefit (expense) |  | 4,973 | (37,030) | (6,419)
Net income |  | 66,956 | 93,229 | 21,297
Other comprehensive income (loss), net of tax |  | 13,775 | (6,641) | (9,398)
Comprehensive (loss) income |  | 80,731 | 86,588 | 11,899
Holding Company [Member] |  |  |  |
Income: |  |  |  |
Money market investments |  | 20 | 20 | 20
Other income |  | 262 | 241 | 498
Total interest and dividends on investments |  | 10,482 | 42,137 | 518
Expense: |  |  |  |
Notes payable and other borrowings |  | 8,284 | 7,705 | 7,450
Other operating expenses |  | 3,175 | 3,481 | 2,412
Total operating expenses |  | 11,459 | 11,186 | 9,862
Investment related proceeds and impairments on equity securities |  | 0 | 0 | 0
Segment income |  | 414 | 35,168 | (9,344)
Income tax benefit (expense) |  | (45) | 0 | 0
Equity in undistributed earnings (losses) of subsidiaries |  | 66,587 | 58,061 | 30,641
Net income |  | 66,956 | 93,229 | 21,297
Other comprehensive income (loss), net of tax |  | 13,775 | (6,641) | (9,398)
Comprehensive (loss) income |  | 80,731 | 86,588 | 11,899
Investment In Banking Subsidiary [Member] | Holding Company [Member] |  |  |  |
Income: |  |  |  |
Dividend Income From Subsidiaries |  | 7,200 | 34,876 | 0
Non Banking Subsidiary [Member] | Holding Company [Member] |  |  |  |
Income: |  |  |  |
Dividend Income From Subsidiaries |  | $ 3,000 | $ 7,000 | $ 0

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