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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 982,754 | $ 1,187,679
Available-for-sale Securities | 1,007,705 | 1,216,538
Held-to-maturity, Amortized cost | 594,639 | 162,752
Held to maturity Fair Value | 595,148 | 164,154
Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,040 |
Held to maturity Fair Value | 25,053 |
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 955,602 | 1,156,455
Available-for-sale Securities | 985,554 | 1,190,391
Held-to-maturity, Amortized cost | 569,599 |
Held to maturity Fair Value | 570,095 |
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 777,412 | 972,836
Available-for-sale Securities | 807,801 | 1,009,509
Held-to-maturity, Amortized cost | 569,599 | 162,752
Held to maturity Fair Value | 570,095 | 164,154
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 30,854 | 4,473
Available-for-sale Securities | 31,929 | 4,753
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 147,336 | 179,146
Available-for-sale Securities | 145,824 | 176,129
Collateralized Mortgage Backed Securities [Member] | Maturities Due From Five To Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 16,410 |
Available-for-sale Securities | 16,772 |
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 | 16,410 |
Available-for-sale Securities | 16,772 |
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 | 939,192 |
Available-for-sale Securities | 968,782 |
Held-to-maturity, Amortized cost | 569,599 |
Held to maturity Fair Value | 570,095 |
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 | 761,002 |
Available-for-sale Securities | 791,029 |
Held-to-maturity, Amortized cost | 569,599 |
Held to maturity Fair Value | 570,095 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 30,854 |
Available-for-sale Securities | 31,929 |
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 | 147,336 |
Available-for-sale Securities | 145,824 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 27,152 | 31,224
Available-for-sale Securities | 22,151 | 26,147
Held-to-maturity, Amortized cost | 25,040 |
Held to maturity Fair Value | 25,053 |
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,040 |
Held to maturity Fair Value | 25,053 |
Investment Securities | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 5,572 | 7,148
Available-for-sale Securities | 5,603 | 7,181
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 18,987 | 20,939
Available-for-sale Securities | 13,793 | 15,672
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,593 | 3,137
Available-for-sale Securities | 2,755 | $ 3,294
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 8,766 |
Available-for-sale Securities | 7,341 |
Held-to-maturity, Amortized cost | 25,040 |
Held to maturity Fair Value | 25,053 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,040 |
Held to maturity Fair Value | 25,053 |
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 | 8,766 |
Available-for-sale Securities | 7,341 |
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 | 5,572 |
Available-for-sale Securities | 5,603 |
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 | 5,572 |
Available-for-sale Securities | 5,603 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due After Ten Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 12,814 |
Available-for-sale Securities | 9,207 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due After Ten Years [Member] | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 10,221 |
Available-for-sale Securities | 6,452 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities | Maturities Due After Ten Years [Member] | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,593 |
Available-for-sale Securities | 2,755 |
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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