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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, 2018 | Sep. 30, 2017
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | $ 14,746 | $ 256,996
Book Value | 14,746 | 250,100
Available-for-sale Securities, Gross Realized Gains | 0 | 6,896
Available-for-sale Securities, Gross Realized Losses | 0 | 0
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 14,746 | 172,794
Book Value | 14,746 | 166,015
Available-for-sale Securities, Gross Realized Gains | 0 | 6,779
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 | 0 | 107,510
Book Value | 0 | 102,311
Available-for-sale Securities, Gross Realized Gains | 0 | 5,199
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 | 14,746 | 65,284
Book Value | 14,746 | 63,704
Available-for-sale Securities, Gross Realized Gains | 0 | 1,580
Available-for-sale Securities, Gross Realized Losses | 0 | 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 |  | 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] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 0 | 84,202
Book Value | 0 | 84,085
Available-for-sale Securities, Gross Realized Gains | 0 | 117
Available-for-sale Securities, Gross Realized Losses | 0 | 0
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Sale of Available-for-sale Securities [Line Items] |  |
Sale Price | 0 | 84,202
Book Value | 0 | 84,085
Available-for-sale Securities, Gross Realized Gains | 0 | 117
Available-for-sale Securities, Gross Realized Losses | $ 0 | $ 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=82897076&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=82897076&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 -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: 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=98514028&loc=d3e3179-108585 + Details
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