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Investment Securities (Investment securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 645,298 | $ 955,646
Available-for-sale Securities, Gross Unrealized Gains | 20,055 | 27,312
Available-for-sale Securities, Gross Unrealized Losses | 1,051 | 8,349
Available-for-sale Securities | $ 664,302 | $ 974,609
Available for sale - Weighted Average Yield | 2.57% | 2.87%
Held-to-maturity, Amortized cost | $ 635,399 | $ 620,189
Held to maturity Securities Unrecognized Gains | 8,131 | 426
Held-to-maturity Securities, Unrecognized Loss | 0 | 5,936
Held to maturity Fair Value | $ 643,530 | $ 614,679
Held to maturity - Weighted Average Yield | 2.13% | 0.0217%
Total Securities - Amortized Cost | $ 1,280,697 | $ 1,575,835
Total Securities Gross Unrealized Gains | 28,186 | 27,738
Total Securities Gross Unrealized Losses | 1,051 | 14,285
Total Securities Fair Value | $ 1,307,832 | $ 1,589,288
Marketable Securities Weighted Average Yield | 2.36% | 2.60%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 632,009 | $ 930,279
Available-for-sale Securities, Gross Unrealized Gains | 19,894 | 27,184
Available-for-sale Securities, Gross Unrealized Losses | 179 | 4,250
Available-for-sale Securities | $ 651,724 | $ 953,213
Available for sale - Weighted Average Yield | 2.55% | 2.82%
Held-to-maturity, Amortized cost | $ 610,384 | $ 595,157
Held to maturity Securities Unrecognized Gains | 8,121 | 426
Held-to-maturity Securities, Unrecognized Loss | 0 | 5,865
Held to maturity Fair Value | $ 618,505 | $ 589,718
Held to maturity - Weighted Average Yield | 2.20% | 0.0224%
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, Gross Unrealized Gains | 14,414 | 25,791
Available-for-sale Securities, Gross Unrealized Losses | 0 | 1,509
Available-for-sale Securities | $ 416,971 | $ 759,645
Available for sale - Weighted Average Yield | 2.61% | 2.97%
Held-to-maturity, Amortized cost | $ 610,384 | $ 595,157
Held to maturity Securities Unrecognized Gains | 8,121 | 426
Held-to-maturity Securities, Unrecognized Loss | 0 | 5,865
Held to maturity Fair Value | $ 618,505 | $ 589,718
Held to maturity - Weighted Average Yield | 2.20% | 2.24%
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, Gross Unrealized Gains | 5,064 | 1,366
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 114,278 | $ 58,495
Available for sale - Weighted Average Yield | 3.06% | 3.19%
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, Gross Unrealized Gains | 416 | 27
Available-for-sale Securities, Gross Unrealized Losses | 179 | 2,741
Available-for-sale Securities | $ 120,475 | $ 135,073
Available for sale - Weighted Average Yield | 1.87% | 1.85%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 13,289 | $ 25,367
Available-for-sale Securities, Gross Unrealized Gains | 161 | 128
Available-for-sale Securities, Gross Unrealized Losses | 872 | 4,099
Available-for-sale Securities | $ 12,578 | $ 21,396
Available for sale - Weighted Average Yield | 3.73% | 4.94%
Held-to-maturity, Amortized cost |  | $ 25,032
Held to maturity Securities Unrecognized Gains | $ 10 | 0
Held-to-maturity Securities, Unrecognized Loss | 0 | 71
Held to maturity Fair Value | $ 25,025 | $ 24,961
Held to maturity - Weighted Average Yield | 0.49% | 0.0049%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | $ 25,015 | $ 25,032
Held to maturity Securities Unrecognized Gains | 10 | 0
Held-to-maturity Securities, Unrecognized Loss | 0 | 71
Held to maturity Fair Value | $ 25,025 | $ 24,961
Held to maturity - Weighted Average Yield | 0.49% | 0.0049%
Securities Investment [Member] | 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, Gross Unrealized Gains | 34 | 0
Available-for-sale Securities, Gross Unrealized Losses | 0 | 29
Available-for-sale Securities | $ 4,502 | $ 5,093
Available for sale - Weighted Average Yield | 1.37% | 1.36%
Securities Investment [Member] | 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, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 872 | 4,070
Available-for-sale Securities | $ 5,848 | $ 13,731
Available for sale - Weighted Average Yield | 5.55% | 6.24%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 2,101 | $ 2,444
Available-for-sale Securities, Gross Unrealized Gains | 127 | 128
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 2,228 | $ 2,572
Available for sale - Weighted Average Yield | 2.94% | 2.98%

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