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Investment Securities (Investment securities) (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, Gross Unrealized Gains | 31,926 | 38,490
Available-for-sale Securities, Gross Unrealized Losses | 6,975 | 9,631
Available-for-sale Securities | $ 1,007,705 | $ 1,216,538
Available for sale - Weighted Average Yield | 2.86% | 2.96%
Held-to-maturity, Amortized cost | $ 594,639 | $ 162,752
Held to maturity Securities Unrecognized Gains | 2,159 | 1,402
Held-to-maturity Securities, Unrecognized Loss | 1,650 | 0
Held to maturity Fair Value | $ 595,148 | $ 164,154
Held to maturity - Weighted Average Yield | 2.19% | 2.48%
Total Securities - Amortized Cost | $ 1,577,393 | $ 1,350,431
Total Securities Gross Unrealized Gains | 34,085 | 39,892
Total Securities Gross Unrealized Losses | 8,625 | 9,631
Total Securities Fair Value | $ 1,602,853 | $ 1,380,692
Marketable Securities Weighted Average Yield | 2.61% | 2.90%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 955,602 | $ 1,156,455
Available-for-sale Securities, Gross Unrealized Gains | 31,733 | 38,300
Available-for-sale Securities, Gross Unrealized Losses | 1,781 | 4,364
Available-for-sale Securities | $ 985,554 | $ 1,190,391
Available for sale - Weighted Average Yield | 2.81% | 2.92%
Held-to-maturity, Amortized cost | $ 569,599 |
Held to maturity Securities Unrecognized Gains | 2,146 |
Held-to-maturity Securities, Unrecognized Loss | 1,650 |
Held to maturity Fair Value | $ 570,095 |
Held to maturity - Weighted Average Yield | 2.26% |
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, Gross Unrealized Gains | 30,486 | 37,876
Available-for-sale Securities, Gross Unrealized Losses | 97 | 1,203
Available-for-sale Securities | $ 807,801 | $ 1,009,509
Available for sale - Weighted Average Yield | 2.98% | 3.12%
Held-to-maturity, Amortized cost | $ 569,599 | $ 162,752
Held to maturity Securities Unrecognized Gains | 2,146 | 1,402
Held-to-maturity Securities, Unrecognized Loss | 1,650 | 0
Held to maturity Fair Value | $ 570,095 | $ 164,154
Held to maturity - Weighted Average Yield | 2.26% | 2.48%
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, Gross Unrealized Gains | 1,075 | 288
Available-for-sale Securities, Gross Unrealized Losses | 0 | 8
Available-for-sale Securities | $ 31,929 | $ 4,753
Available for sale - Weighted Average Yield | 3.31% | 4.94%
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, Gross Unrealized Gains | 172 | 136
Available-for-sale Securities, Gross Unrealized Losses | 1,684 | 3,153
Available-for-sale Securities | $ 145,824 | $ 176,129
Available for sale - Weighted Average Yield | 1.84% | 1.81%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 27,152 | $ 31,224
Available-for-sale Securities, Gross Unrealized Gains | 193 | 190
Available-for-sale Securities, Gross Unrealized Losses | 5,194 | 5,267
Available-for-sale Securities | $ 22,151 | $ 26,147
Available for sale - Weighted Average Yield | 4.43% | 4.23%
Held-to-maturity, Amortized cost | $ 25,040 |
Held to maturity Securities Unrecognized Gains | 13 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held to maturity Fair Value | $ 25,053 |
Held to maturity - Weighted Average Yield | 0.49% |
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Held-to-maturity, Amortized cost | $ 25,040 |
Held to maturity Securities Unrecognized Gains | 13 |
Held-to-maturity Securities, Unrecognized Loss | 0 |
Held to maturity Fair Value | $ 25,053 |
Held to maturity - Weighted Average Yield | 0.49% |
Securities Investment [Member] | 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, Gross Unrealized Gains | 31 | 33
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 5,603 | $ 7,181
Available for sale - Weighted Average Yield | 1.36% | 1.34%
Securities Investment [Member] | 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, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 5,194 | 5,267
Available-for-sale Securities | $ 13,793 | $ 15,672
Available for sale - Weighted Average Yield | 5.53% | 5.41%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 2,593 | $ 3,137
Available-for-sale Securities, Gross Unrealized Gains | 162 | 157
Available-for-sale Securities, Gross Unrealized Losses | 0 | 0
Available-for-sale Securities | $ 2,755 | $ 3,294
Available for sale - Weighted Average Yield | 2.95% | 2.95%

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