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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 645,298 | $ 955,646
Available-for-sale Securities | 664,302 | 974,609
Held-to-maturity, Amortized cost | 635,399 | 620,189
Held to maturity Fair Value | 643,530 | 614,679
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 632,009 | 930,279
Available-for-sale Securities | 651,724 | 953,213
Held-to-maturity, Amortized cost | 610,384 | 595,157
Held to maturity Fair Value | 618,505 | 589,718
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 402,557 | 735,363
Available-for-sale Securities | 416,971 | 759,645
Held-to-maturity, Amortized cost | 610,384 | 595,157
Held to maturity Fair Value | 618,505 | 589,718
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 109,214 | 57,129
Available-for-sale Securities | 114,278 | 58,495
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 120,238 | 137,787
Available-for-sale Securities | 120,475 | 135,073
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 12,650 |
Available-for-sale Securities | 12,996 |
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 | 12,650 |
Available-for-sale Securities | 12,996 |
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 | 619,359 |
Available-for-sale Securities | 638,728 |
Held-to-maturity, Amortized cost | 610,384 |
Held to maturity Fair Value | 618,505 |
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 | 389,907 |
Available-for-sale Securities | 403,975 |
Held-to-maturity, Amortized cost | 610,384 |
Held to maturity Fair Value | 618,505 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 109,214 |
Available-for-sale Securities | 114,278 |
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 | 120,238 |
Available-for-sale Securities | 120,475 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 13,289 | 25,367
Available-for-sale Securities | 12,578 | 21,396
Held-to-maturity, Amortized cost |  | 25,032
Held to maturity Fair Value | 25,025 | 24,961
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,015 | 25,032
Held to maturity Fair Value | 25,025 | 24,961
Investment Securities | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 4,468 | 5,122
Available-for-sale Securities | 4,502 | 5,093
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720 | 17,801
Available-for-sale Securities | 5,848 | 13,731
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,101 | 2,444
Available-for-sale Securities | 2,228 | $ 2,572
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,720 |
Available-for-sale Securities | 5,848 |
Held-to-maturity, Amortized cost | 25,015 |
Held to maturity Fair Value | 25,025 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 0 |
Available-for-sale Securities | 0 |
Held-to-maturity, Amortized cost | 25,015 |
Held to maturity Fair Value | 25,025 |
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 |
Available-for-sale Securities | 5,848 |
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 | 6,569 |
Available-for-sale Securities | 6,730 |
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 | 4,468 |
Available-for-sale Securities | 4,502 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due From Five To Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,101 |
Available-for-sale Securities | 2,228 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | $ 0 |

X
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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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