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Allowance for Loan and Lease Losses (Composition of the Company's allowance for loan and lease losses) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 238,271,000 $ 234,131,000
Non-Acquired Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 113,238,000 112,626,000
Non-Acquired Loan [Member] | Mortgage Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 18,784,000 18,352,000
Non-Acquired Loan [Member] | Commercial Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 64,206,000 64,791,000
Non-Acquired Loan [Member] | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 11,414,000 11,197,000
Non-Acquired Loan [Member] | Auto and Leasing [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 18,716,000 18,261,000
Non-Acquired Loan [Member] | Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 118,000 25,000
Acquired loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 145,978,000 143,953,000
Acquired loans [Member] | Acquired BBVAPR Accounted for under ASC 310-20 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 4,993,000 5,542,000
Acquired loans [Member] | 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 23,000 26,000
Acquired loans [Member] | 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 3,243,000 3,429,000
Acquired loans [Member] | 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 1,727,000 2,087,000
Acquired loans [Member] | Acquired BBVAPR accounted under ASC 310-30 [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 27,747,000 25,785,000
Acquired loans [Member] | 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 1,762,000 1,762,000
Acquired loans [Member] | 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 20,430,000 21,161,000
Acquired loans [Member] | 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 5,555,000 2,862,000
Eurobank Acquired Loans    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 92,293,000 90,178,000
Eurobank Acquired Loans | Consumer Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses 243,000 243,000
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 23,961,000 22,570,000
Eurobank Acquired Loans | Commercial and Other Construction Loan [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan and lease losses $ 68,089,000 $ 67,365,000