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Loans Receivable (Narratives) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Accounts Notes And Loans Receivable Line Items      
Financing Receivable Modifications Recorded Investment Not Included In Non Accrual $ 96,500,000 $ 93,600,000  
Originated Loans Granted To Puerto Rico Government 330,800,000 334,600,000  
Acquired Loans Under ASC 310-30 granted to the Puerto Rico Government 71,000,000 80,900,000  
Loans And Leases Receivable Gross Carrying Amount Covered 91,100,000 92,300,000  
Loans And Leases Receivable Net Reported Amount Covered 69,700,000 67,200,000  
Line Of Credit Facility Maximum Borrowing Capacity to Puerto Rico Government 401,800,000 415,400,000  
Credit Facilities Granted to the Puerto Rico Public Corporation 198,200,000    
Total four bank syndicate revolving line of credit granted to the Government of Puerto Rico 550,000,000    
Unpaid principal balance of the revolving line of credit granted to the Government of Puerto Rico 186,700,000 190,300,000  
Provision for Local Government Line of Credit   29,300,000 $ 24,000,000
Allowance for Local Government Line of Credit 53,300,000 53,300,000  
General obligations debt of municipalities secured 204,000,000    
Puerto Rico Housing Finance Authority credit facilities 11,000,000    
Interest income for covered loans 2,200,000 $ 15,500,000  
FDIC payment in loss-share coverage of loans sold 20,000,000    
Provision for Loan Losses, Covered $ 54,000   $ 4,800,000