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Securities Purchased Under Agreements to Resell and Investment (Investment securities) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
--- | --- | ---
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | $ 1,437,106 | $ 1,575,043
Available-for-sale Securities, Gross Unrealized Gains | 32,771 | 34,096
Available-for-sale Securities, Gross Unrealized Losses | 14,192 | 20,714
Available-for-sale Securities | 1,455,685 | 1,588,425
Available for sale - Weighted Average Yield | 2.74% | 2.89%
Collateralized Mortgage Backed Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,311,171 | 1,419,117
Available-for-sale Securities, Gross Unrealized Gains | 32,546 | 33,929
Available-for-sale Securities, Gross Unrealized Losses | 8,852 | 13,507
Available-for-sale Securities | 1,334,865 | 1,439,539
Available for sale - Weighted Average Yield | 2.84% | 2.76%
Collateralized Mortgage Backed Securities [Member] | FNMA and FHLMC [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 1,093,717 | 1,190,910
Available-for-sale Securities, Gross Unrealized Gains | 31,769 | 33,089
Available-for-sale Securities, Gross Unrealized Losses | 4,690 | 6,669
Available-for-sale Securities | 1,120,796 | 1,217,330
Available for sale - Weighted Average Yield | 3.00% | 2.93%
Collateralized Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 6,146 | 7,406
Available-for-sale Securities, Gross Unrealized Gains | 426 | 433
Available-for-sale Securities, Gross Unrealized Losses | 23 | 24
Available-for-sale Securities | 6,549 | 7,815
Available for sale - Weighted Average Yield | 4.93% | 4.92%
Collateralized Mortgage Backed Securities [Member] | CMO's [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 211,308 | 220,801
Available-for-sale Securities, Gross Unrealized Gains | 351 | 407
Available-for-sale Securities, Gross Unrealized Losses | 4,139 | 6,814
Available-for-sale Securities | 207,520 | 214,394
Available for sale - Weighted Average Yield | 1.78% | 1.78%
Securities Investment [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 125,935 | 155,926
Available-for-sale Securities, Gross Unrealized Gains | 225 | 167
Available-for-sale Securities, Gross Unrealized Losses | 5,340 | 7,207
Available-for-sale Securities | 120,820 | 148,886
Available for sale - Weighted Average Yield | 1.72% | 2.99%
Securities Investment [Member] | US Treasury Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 70,000 |
Available-for-sale Securities, Gross Unrealized Gains | 0 |
Available-for-sale Securities, Gross Unrealized Losses | 0 |
Available-for-sale Securities | 70,000 |
Available for sale - Weighted Average Yield | 0.03% |
Securities Investment [Member] | Obligation of US Government sponsored agencies [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 9,539 | 10,691
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 42 | 42
Available-for-sale Securities | 9,497 | 10,649
Available for sale - Weighted Average Yield | 1.23% | 1.21%
Securities Investment [Member] | Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 22,367 | 121,035
Available-for-sale Securities, Gross Unrealized Gains | 0 | 0
Available-for-sale Securities, Gross Unrealized Losses | 5,298 | 6,845
Available-for-sale Securities | 17,069 | 114,190
Available for sale - Weighted Average Yield | 5.32% | 4.38%
Securities Investment [Member] | Other Debt Obligations [Member] |  |
Schedule of Investments [Line Items] |  |
Available for sale Amortized Cost | 24,029 | 24,200
Available-for-sale Securities, Gross Unrealized Gains | 225 | 167
Available-for-sale Securities, Gross Unrealized Losses | 0 | 320
Available-for-sale Securities | $ 24,254 | $ 24,047
Available for sale - Weighted Average Yield | 3.46% | 3.46%

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