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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
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 164,231 $ 167,509
Acquired BBVAPR loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 44,072 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 2,062 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 22 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 1,905 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 135 595
Acquired BBVAPR accounted under ASC 310-30 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 42,010 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 15,225 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 20,641 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 0 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 6,144 7,961
Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 24,971 25,174
Originated Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 95,188 92,718
Originated Loan [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 19,783 20,439
Originated Loan [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 30,326 30,258
Originated Loan [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 15,571 16,454
Originated Loan [Member] | Auto and Leasing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 29,508 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 24,971 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 4
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 15,382 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 $ 9,585 $ 9,983