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Investment Securities (Investment securities by contractual maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 955,646 | $ 1,187,679
Available-for-sale Securities | 974,609 | 1,216,538
Held-to-maturity, Amortized cost | 620,189 | 162,752
Held to maturity Fair Value | 614,679 | 164,154
Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,032 |
Held to maturity Fair Value | 24,961 |
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 930,279 | 1,156,455
Available-for-sale Securities | 953,213 | 1,190,391
Held-to-maturity, Amortized cost | 595,157 |
Held to maturity Fair Value | 589,718 |
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 735,363 | 972,836
Available-for-sale Securities | 759,645 | 1,009,509
Held-to-maturity, Amortized cost | 595,157 | 162,752
Held to maturity Fair Value | 589,718 | 164,154
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 57,129 | 4,473
Available-for-sale Securities | 58,495 | 4,753
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 137,787 | 179,146
Available-for-sale Securities | 135,073 | 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 | 15,098 |
Available-for-sale Securities | 15,228 |
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 | 15,098 |
Available-for-sale Securities | 15,228 |
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 | 915,181 |
Available-for-sale Securities | 937,985 |
Held-to-maturity, Amortized cost | 595,157 |
Held to maturity Fair Value | 589,718 |
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 | 720,265 |
Available-for-sale Securities | 744,417 |
Held-to-maturity, Amortized cost | 595,157 |
Held to maturity Fair Value | 589,718 |
Collateralized Mortgage Backed Securities [Member] | Maturities Due After Ten Years [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 57,129 |
Available-for-sale Securities | 58,495 |
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 | 137,787 |
Available-for-sale Securities | 135,073 |
Held-to-maturity, Amortized cost | 0 |
Held to maturity Fair Value | 0 |
Investment Securities |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 25,367 | 31,224
Available-for-sale Securities | 21,396 | 26,147
Held-to-maturity, Amortized cost | 25,032 |
Held to maturity Fair Value | 24,961 |
Investment Securities | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,032 |
Held to maturity Fair Value | 24,961 |
Investment Securities | Obligation of US Government sponsored agencies at loss [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 5,122 | 7,148
Available-for-sale Securities | 5,093 | 7,181
Investment Securities | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 17,801 | 20,939
Available-for-sale Securities | 13,731 | 15,672
Investment Securities | Other Debt Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 2,444 | 3,137
Available-for-sale Securities | 2,572 | $ 3,294
Investment Securities | Maturities Due From One To Five Years [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 8,733 |
Available-for-sale Securities | 7,438 |
Held-to-maturity, Amortized cost | 25,032 |
Held to maturity Fair Value | 24,961 |
Investment Securities | Maturities Due From One To Five Years [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | 25,032 |
Held to maturity Fair Value | 24,961 |
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 | 8,733 |
Available-for-sale Securities | 7,438 |
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 | 5,122 |
Available-for-sale Securities | 5,093 |
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 | 5,122 |
Available-for-sale Securities | 5,093 |
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 | 11,512 |
Available-for-sale Securities | 8,865 |
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 | 9,068 |
Available-for-sale Securities | 6,293 |
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 | 2,444 |
Available-for-sale Securities | 2,572 |
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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