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FIRST BANCORP. (Holding Company Only) Financial Information - Statements of Cash Flows (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Cash Provided By Used In Operating Activities [Abstract] |  |  |  |  |
Net income |  |  | $ 66,956 | $ 93,229 | $ 21,297
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Gain on extinguishment of debt |  | $ (2,300) | (1,391) | (4,217) | 0
Deferred income tax provision |  |  | (13,152) | 23,879 | 80
Share Based Compensation |  |  | 7,296 | 6,876 | 6,037
Other Than Temporary Impairment Losses Investments Portion Recognized In Earnings Net | [1] |  | 12,231 | 6,687 | 16,517
(Increase) decrease in other assets |  |  | (202) | 17,716 | 20,625
Increase Decrease In Other Operating Liabilities |  |  | 7,665 | (15,144) | 5,891
Net Cash Provided By Used In Operating Activities |  |  | 235,964 | 199,432 | 261,891
Net Cash Provided By Used In Investing Activities [Abstract] |  |  |  |  |
Principal collected on loans |  |  | 2,504,629 | 2,830,830 | 2,969,616
Proceeds from sale of available-for-sale securities |  |  | 23,408 | 219,780 | 0
Net Cash Provided By Used In Investing Activities |  |  | (73,256) | 83,194 | 438,979
Net Cash Provided By Used In Financing Activities [Abstract] |  |  |  |  |
Repayments of junior subordinated debentures |  |  | (5,930) | (7,025) | 0
Dividends paid on preferred stock |  |  | (2,676) | (223) | 0
Repurchase of outstanding common stock |  |  | (2,497) | (1,132) | (1,173)
Net Cash Provided By Used In Financing Activities |  |  | 254,002 | (735,399) | (744,520)
Cash And Cash Equivalents Period Increase Decrease |  |  | 416,710 | (452,773) | (43,650)
Cash and cash equivalents at beginning of year |  | 716,395 | 299,685 | 752,458 | 796,108
Cash and cash equivalents at end of year |  |  | 716,395 | 299,685 | 752,458
Cash and cash equivalents include: |  |  |  |  |
Money market instruments |  |  | 10,415 | 10,094 | 219,473
Parent Company [Member] |  |  |  |  |
Net Cash Provided By Used In Operating Activities [Abstract] |  |  |  |  |
Net income |  |  | 66,956 | 93,229 | 21,297
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Share Based Compensation |  |  | 3,769 | 3,563 | 2,835
Equity in loss of unconsolidated entity |  |  | (66,587) | (58,061) | (30,641)
Accretion Amortization Of Discounts And Premiums Loans |  |  | (14) | (11) | (7)
(Increase) decrease in other assets |  |  | (8) | 802 | (293)
Increase Decrease In Other Operating Liabilities |  |  | (201) | (26,685) | 6,643
Net Cash Provided By Used In Operating Activities |  |  | 2,524 | 8,620 | (166)
Net Cash Provided By Used In Investing Activities [Abstract] |  |  |  |  |
Principal collected on loans |  |  | 50 | 50 | 63
Net Cash Provided By Used In Investing Activities |  |  | 50 | 50 | 63
Net Cash Provided By Used In Financing Activities [Abstract] |  |  |  |  |
Repurchase of outstanding common stock |  |  | (2,497) | (1,132) | (1,174)
Net Cash Provided By Used In Financing Activities |  |  | (11,103) | (8,380) | (1,174)
Cash And Cash Equivalents Period Increase Decrease |  |  | (8,529) | 290 | (1,277)
Cash and cash equivalents at beginning of year |  | $ 26,975 | 35,504 | 35,214 | 36,491
Cash and cash equivalents at end of year |  |  | 26,975 | 35,504 | 35,214
Cash and cash equivalents include: |  |  |  |  |
Due From Banks |  |  | 20,864 | 29,393 | 29,103
Money market instruments |  |  | $ 6,111 | $ 6,111 | $ 6,111
[1] | For the years ended December 31, 2017, 2016 and 2015, approximately $12.2 million, $6.3 million and $15.9 million, respectively, of the credit impairment recognized in earnings consisted of credit losses on Puerto Rico government debt securities that were sold in the second quarter of 2017, as further discussed below. The remaining impairment losses for the years ended December 31, 2016 and 2015 were associated with credit losses on private label MBS.

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- Definition The sum of the periodic adjustments of the differences between loan receivables' face values and purchase prices that are charged against earnings. This is called accretion if the loan was purchased at a discount and amortization if it was purchased at premium. + References No definition available. + Details
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