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Deposits and Related Interest (Narratives) (Details) - USD ($)
Mar. 31, 2016
Dec. 31, 2015
Deposits [Abstract]    
Weighted Average Rate Domestic Deposit 0.60% 0.56%
Puerto Rico Cash & Money Market Fund Deposits $ 103,000,000 $ 103,700,000
Puerto Rico Cash & Money Market Fund Deposits Weighted Average Rate 0.77% 0.77%
Puerto Rico Cash & Money Market Fund Deposits Collateral $ 78,800,000 $ 81,600,000
Time Deposits, $100,000 or More 591,000,000 597,600,000
Public Fund Time Deposits, $100,000 or more $ 5,400,000 $ 7,700,000
Public Fund Time Deposits Weighted Average Rate, $100,000 or more 0.47% 0.49%
Public funds deposit $ 220,500,000 $ 99,000,000
Public Fund Collateral Investments 410,900,000 410,900,000
Accrued Interest, Time Deposits 1,700,000  
Unamortized deposit discounts 234,000  
Bank Overdrafts 565,000 1,500,000
Brokered Certificates of Deposits 617,600,000 711,400,000
Brokered Money Market Deposit 70,500,000 $ 71,600,000
Equity indexed option $ 746,000