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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