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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 653,673,000 | $ 955,646,000
Available-for-sale Securities | 669,285,000 | 974,609,000
Held-to-maturity, Amortized cost | 637,036,000 | 620,189,000
Held to maturity Fair Value | 641,346,000 | 614,679,000
US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost |  | 25,032,000
Held to maturity Fair Value |  | 24,961,000
Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,785,000 |
Available-for-sale Securities | 4,837,000 |
Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720,000 |
Available-for-sale Securities | 5,847,000 |
Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,323,000 | 2,444,000
Available-for-sale Securities | 2,465,000 | 2,572,000
Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,024,000 |
Held to maturity Fair Value | 25,013,000 |
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 639,845,000 | 930,279,000
Available-for-sale Securities | 656,136,000 | 953,213,000
Held-to-maturity, Amortized cost | 612,012,000 | 595,157,000
Held to maturity Fair Value | 616,333,000 | 589,718,000
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 431,411,000 | 735,363,000
Available-for-sale Securities | 444,856,000 | 759,645,000
Held-to-maturity, Amortized cost | 612,012,000 | 595,157,000
Held to maturity Fair Value | 616,333,000 | 589,718,000
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 79,477,000 | 57,129,000
Available-for-sale Securities | 82,697,000 | 58,495,000
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 128,957,000 | 137,787,000
Available-for-sale Securities | 128,583,000 | 135,073,000
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 13,936,000 |
Available-for-sale Securities | 14,250,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 13,936,000 |
Available-for-sale Securities | 14,250,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 625,909,000 |
Available-for-sale Securities | 641,886,000 |
Held-to-maturity, Amortized cost | 612,012,000 |
Held to maturity Fair Value | 616,333,000 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 417,475,000 |
Available-for-sale Securities | 430,606,000 |
Held-to-maturity, Amortized cost | 612,012,000 |
Held to maturity Fair Value | 616,333,000 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 79,477,000 |
Available-for-sale Securities | 82,697,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 128,957,000 |
Available-for-sale Securities | 128,583,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 13,828,000 | 25,367,000
Available-for-sale Securities | 13,149,000 | 21,396,000
Held-to-maturity, Amortized cost | 25,024,000 | 25,032,000
Held to maturity Fair Value | 25,013,000 | 24,961,000
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,024,000 | 25,032,000
Held to maturity Fair Value | 25,013,000 | 24,961,000
Investment Securities | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,785,000 | 5,122,000
Available-for-sale Securities | 4,837,000 | 5,093,000
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720,000 | 17,801,000
Available-for-sale Securities | 5,847,000 | 13,731,000
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,323,000 | 2,444,000
Available-for-sale Securities | 2,465,000 | $ 2,572,000
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720,000 |
Available-for-sale Securities | 5,847,000 |
Held-to-maturity, Amortized cost | 25,024,000 |
Held to maturity Fair Value | 25,013,000 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,024,000 |
Held to maturity Fair Value | 25,013,000 |
Investment Securities | Maturities Due From One To Five Years [Member] | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720,000 |
Available-for-sale Securities | 5,847,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 7,108,000 |
Available-for-sale Securities | 7,302,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,785,000 |
Available-for-sale Securities | 4,837,000 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | $ 0 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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