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Investment Securities (Gross realize gains and losses by category) (Details) - USD ($) $ in Thousands | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | $ 256,996 | $ 300,483
Book Value | 250,100 | 288,276
Available-for-sale Securities, Gross Realized Gains | 6,896 | 16,324
Available-for-sale Securities, Gross Realized Losses | 0 | 4,117
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 172,794 | 293,505
Book Value | 166,015 | 277,181
Available-for-sale Securities, Gross Realized Gains | 6,779 | 16,324
Available-for-sale Securities, Gross Realized Losses | 0 | 0
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 107,510 | 293,505
Book Value | 102,311 | 277,181
Available-for-sale Securities, Gross Realized Gains | 5,199 | 16,324
Available-for-sale Securities, Gross Realized Losses | 0 | 0
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 65,284 |
Book Value | 63,704 |
Available-for-sale Securities, Gross Realized Gains | 1,580 |
Available-for-sale Securities, Gross Realized Losses | 0 |
Collateralized Mortgage Backed Securities [Member] | Obligations of Puerto Rico Government and Public Instrumentalities |  |
Schedule of Sale 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] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 84,202 |
Book Value | 84,085 |
Available-for-sale Securities, Gross Realized Gains | 117 |
Available-for-sale Securities, Gross Realized Losses | 0 |
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 84,202 |
Book Value | 84,085 |
Available-for-sale Securities, Gross Realized Gains | 117 |
Available-for-sale Securities, Gross Realized Losses | $ 0 |

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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=73527792&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=73527792&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=66010992&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=66902209&loc=d3e3179-108585 + Details
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