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Allowance for Loan and Lease Losses (Composition of the Company's allowance for loan and lease losses) (Details) - USD ($)
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 154,160,000 $ 115,937,000
Acquired BBVAPR loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 43,473,000 35,356,000
Acquired BBVAPR Accounted for under ASC 310-20 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 3,363,000 4,300,000
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 41,000 169,000
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 2,591,000 3,028,000
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 731,000 1,103,000
Acquired BBVAPR accounted under ASC 310-30 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 40,110,000 31,056,000
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 8,931,000 2,682,000
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 23,941,000 23,452,000
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 7,238,000 4,922,000
Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 23,146,000 21,281,000
Originated Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 87,541,000 59,300,000
Originated Loan [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 22,308,000 17,344,000
Originated Loan [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 24,278,000 8,995,000
Originated Loan [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 15,793,000 13,067,000
Originated Loan [Member] | Auto and Leasing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 25,162,000 19,463,000
Originated Loan [Member] | Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 0 431,000
Acquired loans [Member] | Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 23,146,000 21,281,000
Acquired loans [Member] | Eurobank Acquired Loans | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 5,000 6,000
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 14,219,000 11,947,000
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 $ 8,922,000 $ 9,328,000