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OTHER NON- INTEREST INCOME- Detail of other non-interest income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Non-interest Income [Abstract]        
Commissions and fees- broker-dealer related   $ 0 $ 789 $ 0
Noninterest Income, Other   4,291 4,976 4,109
Non Deferrable Loan Fees   2,109 3,346 2,687
Other Fees And Commissions Credit Cards   7,587 7,492 7,723
Automated Teller Machine And Point Of Sale Fees   8,929 8,462 7,213
Merchant Discount Fees   4,209 4,095 9,510
Gains Losses On Extinguishment Of Debt $ 2,300 1,391 4,217 0
Mail And Cable Transmision Commissions Revenue   1,729 1,740 1,552
Total   $ 28,854 $ 30,900 $ 32,794