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Allowance for Loan and Lease Losses (Composition of the Company's allowance for loan and lease losses) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 168,592 $ 167,509
Acquired BBVAPR loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 46,350 49,617
Acquired BBVAPR Accounted for under ASC 310-20 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 3,184 3,862
Acquired BBVAPR Accounted for under ASC 310-20 [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 37 42
Acquired BBVAPR Accounted for under ASC 310-20 [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 2,659 3,225
Acquired BBVAPR Accounted for under ASC 310-20 [Member] | Auto Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 488 595
Acquired BBVAPR accounted under ASC 310-30 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 43,166 45,755
Acquired BBVAPR accounted under ASC 310-30 [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 14,331 14,085
Acquired BBVAPR accounted under ASC 310-30 [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 22,047 23,691
Acquired BBVAPR accounted under ASC 310-30 [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 18 18
Acquired BBVAPR accounted under ASC 310-30 [Member] | Auto Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 6,770 7,961
Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 25,410 25,174
Originated Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 96,832 92,718
Originated Loan [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 18,983 20,439
Originated Loan [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 33,174 30,258
Originated Loan [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 18,023 16,454
Originated Loan [Member] | Auto and Leasing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 26,652 25,567
Originated Loan [Member] | Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 0 0
Acquired loans [Member] | Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 25,410 25,174
Acquired loans [Member] | Eurobank Acquired Loans | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 4 5
Acquired loans [Member] | Eurobank Acquired Loans | Loans secured by 1-4 family residential properties, covered [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 15,414 15,187
Acquired loans [Member] | Eurobank Acquired Loans | Commercial and Other Construction Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 9,992 $ 9,982