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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
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 165,742 $ 167,509
Acquired BBVAPR loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 46,225 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 2,350 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 17 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 2,140 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 193 595
Acquired BBVAPR accounted under ASC 310-30 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 43,875 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 15,258 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 22,256 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 6,343 7,961
Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 24,281 25,174
Originated Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 95,236 92,718
Originated Loan [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 19,545 20,439
Originated Loan [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 32,491 30,258
Originated Loan [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 15,715 16,454
Originated Loan [Member] | Auto and Leasing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 27,485 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 24,281 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 15,155 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 $ 9,122 $ 9,983