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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | 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 | $ 1,100 |  |  |
Money market investments | 4,930 | $ 7,021 |  |
Securitized GNMA pools retained, amortized cost | $ 56,800 | $ 74,900 | $ 112,200 |
Securitized GNMA pool retained, yield | 3.93% | 3.14% | 2.89% |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities sold , Book Value | $ 17,837 | $ 250,100 | $ 288,276 |
Gain (Loss) on Sale of Securities, Net | 0 | 6,896 | 12,207 |
Other Than Temporary Impairment Credit Losses Recognized In Earnings Credit Losses On Debt Securities Held | 0 | 0 | 0 | $ 1,490
Collateralized Mortgage Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities sold , Book Value | 17,837 | 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 | 0 | 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 | 17,837 | 63,704 |  |
US Treasury Securities |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Available-for-sale securities sold , Book Value | $ 0 | $ 84,085 | 11,095 |
US Treasury Securities | 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 |

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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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