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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price | $ 300,483 | $ 103,831 | $ 214,518
Book Value | 288,276 | 101,259 | 210,152
Available-for-sale Securities, Gross Realized Gains | 16,324 | 2,572 | 4,366
Available-for-sale Securities, Gross Realized Losses | 4,117 | 0 | 0
Collateralized Mortgage Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price | 293,505 | 103,831 | 214,518
Book Value | 277,181 | 101,259 | 210,152
Available-for-sale Securities, Gross Realized Gains | 16,324 | 2,572 | 4,366
Available-for-sale Securities, Gross Realized Losses | 0 | 0 | 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price | 293,505 | 40,307 | 115,158
Book Value | 277,181 | 37,736 | 110,792
Available-for-sale Securities, Gross Realized Gains | 16,324 | 2,571 | 4,366
Available-for-sale Securities, Gross Realized Losses | 0 | 0 | 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price |  | 63,524 | 99,360
Book Value |  | 63,523 | 99,360
Available-for-sale Securities, Gross Realized Gains |  | 1 | 0
Available-for-sale Securities, Gross Realized Losses |  | $ 0 | $ 0
Securities Investment [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price | 6,978 |  |
Book Value | 11,095 |  |
Available-for-sale Securities, Gross Realized Gains | 0 |  |
Available-for-sale Securities, Gross Realized Losses | 4,117 |  |
Securities Investment [Member] | Obligations of Puerto Rico Government and Public Instrumentalities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Sale Price | 6,978 |  |
Book Value | 11,095 |  |
Available-for-sale Securities, Gross Realized Gains | 0 |  |
Available-for-sale Securities, Gross Realized Losses | $ 4,117 |  |

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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 This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3179-108585 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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