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Investment Securities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position $ 1,200    
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position $ 2,500    
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 99.80%    
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position 0.20%    
Maximum GovernmentBond Probability Of Default 2.30%    
Money market investments $ 7,428   $ 7,021
Securitized GNMA pools retained, amortized cost $ 18,000   $ 25,000
Securitized GNMA pool retained, yield 3.26%   3.14%
Schedule of Available-for-sale Securities [Line Items]      
Gain (Loss) on Sale of Securities, Net $ 0 $ 0  
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value $ 2,400    
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss Position With Cumulative Default Percentage at Maturity 98.00%