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Investment Securities (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 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 |  | $ 1,200 |  |
Money market investments | 5,805 |  | 5,805 |  | $ 7,021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | 14,746 | $ 250,100 |
Gain (Loss) on Sale of Securities, Net | $ 0 | $ 4 | 0 | 6,896 |
Collateralized Mortgage Backed Securities [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | 14,746 | 166,015 |
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 |
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 |  |  | 14,746 | 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 |  |  |  | 84,085 |
US Treasury Securities |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale securities sold , Book Value |  |  | $ 0 | $ 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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- Definition Investments in unrealized loss on positions guaranteed by US Treasury and sponsored agencies which are not subject to credit risk due to market conditions. + References No definition available. + Details
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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References No definition available. + Details
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