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Deposits and Related Interest (Narratives) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deposits [Abstract]    
Weighted Average Rate Domestic Deposit 0.65% 0.62%
Puerto Rico Cash & Money Market Fund Deposits   $ 15,300
Puerto Rico Cash & Money Market Fund Deposits Weighted Average Rate   0.77%
Time Deposits, $250,000 or More $ 364,700 $ 344,000
Public Fund Time Deposits, $250,000 or more $ 13,300 $ 2,100
Public Fund Time Deposits Weighted Average Rate, $250,000 or more 0.67% 0.50%
Public funds deposit $ 135,800 $ 170,700
Public Fund Collateral Investments 174,300 209,200
Accrued Interest, Time Deposits 2,100  
Bank Overdrafts 593 575
Brokered Certificates of Deposits 487,000 508,400
Brokered Money Market Deposit $ 48,600 $ 68,000