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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |  |  |  |  |  |
Investments Guaranteed by US Treasury and Sponsored Agencies in Unrealized Loss on Position | $ 714,900 |  | $ 714,900 |  |  |
Investments Guaranteed by Puerto Rico Government and its Political Subdivisions in Unrealized Loss On Position | $ 2,500 |  | $ 2,500 |  |  |
Investments Guaranteed By Us Treasury And Sponsored Agencies in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position | 99.70% |  | 99.70% |  |  |
Investments Guaranteed By Puerto Rico Government and Its Political Subdivisions in Unrealized Loss Position Percentage To Total Investment in Unrealized Loss Position | 0.30% |  | 0.30% |  |  |
Maximum GovernmentBond Probability Of Default | 6.60% |  | 6.60% |  |  |
Money market investments | $ 6,530 |  | $ 6,530 |  | $ 5,606 |
Securitized GNMA pools retained, amortized cost | $ 69,300 | $ 71,800 | $ 69,300 | $ 71,800 |  |
Securitized GNMA pool retained, yield | 3.14% | 2.99% | 3.14% | 2.99% |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | $ 250,100 | $ 288,276 |  |
Gain (Loss) on Sale of Securities, Net | $ 4 | $ 0 | 6,896 | 12,207 |  |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held | 0 | $ 0 | 0 | 0 | $ 0 | $ 1,490
Investments Guaranteed By Local Government And Its Political Subdivisions In Unrealized Loss On Position with Cumulative Default Probability Fair Value | $ 2,200 |  | 2,200 |  |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | 166,015 | 277,181 |  |
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | 102,311 | 277,181 |  |
Collateralized Mortgage Backed Securities [Member] | Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | 63,704 |  |  |
Collateralized Mortgage Backed Securities [Member] | Obligations of Puerto Rico Government and Public Instrumentalities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  |  | $ 11,095 |  |
US Treasury Securities |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | $ 84,085 |  |  |

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- Definition This item represents the book value at the sale of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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