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Investment Securities (Gains and losses by category) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | $ 404,309 | $ 558,062
Total Available for Sale Unrealized Loss | 12,996 | 20,714
Total Available for Sale Fair Value | 391,314 | 537,348
12 months or more |  |
Available for sale - Amortized cost | 354,548 | 23,485
Available for sale - Unrealized Loss | 12,782 | 5,718
Available-for-sale, Fair Value | 341,768 | 17,767
Less than 12 months |  |
Available for sale - Amortized cost |  | 534,577
Available for sale - Unrealized Loss |  | 14,996
Available for sale - Fair Value |  | 519,581
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity - Amortized Cost | 95,598 |
Held to Maturity - Unrealized Loss | 170 |
Held to Maturity - Fair Value | 95,428 |
Investment Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Securities - Amortized Cost | 499,907 | 558,062
Total Securities - Unrealized Position | 13,166 | 20,714
Total Securities - Fair Value | 486,742 | 537,348
CMO's issued by us government sponsored agenciesat loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 165,703 | 185,220
Total Available for Sale Unrealized Loss | 4,390 | 6,814
Total Available for Sale Fair Value | 161,314 | 178,406
12 months or more |  |
Available for sale - Amortized cost | 149,957 | 2,559
Available for sale - Unrealized Loss | 4,242 | 237
Available-for-sale, Fair Value | 145,716 | 2,322
Less than 12 months |  |
Available for sale - Amortized cost | 15,746 | 182,661
Available for sale - Unrealized Loss | 148 | 6,577
Available for sale - Fair Value | 15,598 | 176,084
FNMA and FHLMC [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 209,699 | 220,913
Total Available for Sale Unrealized Loss | 3,082 | 6,669
Total Available for Sale Fair Value | 206,617 | 214,244
12 months or more |  |
Available for sale - Amortized cost | 183,479 |
Available for sale - Unrealized Loss | 3,049 |
Available-for-sale, Fair Value | 180,430 |
Less than 12 months |  |
Available for sale - Amortized cost | 26,220 | 220,913
Available for sale - Unrealized Loss | 33 | 6,669
Available for sale - Fair Value | 26,187 | 214,244
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity - Amortized Cost | 95,598 |
Held to Maturity - Unrealized Loss | 170 |
Held to Maturity - Fair Value | 95,428 |
Less than 12 months |  |
Held to Maturity - Amortized cost | 95,598 |
Held to Maturity - Unrealized Loss | 170 |
Held-to-Maturity - Fair Value | 95,428 |
Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 20,915 | 121,035
Total Available for Sale Unrealized Loss | 5,469 | 6,845
Total Available for Sale Fair Value | 15,446 | 114,190
12 months or more |  |
Available for sale - Amortized cost | 20,915 | 20,845
Available for sale - Unrealized Loss | 5,469 | 5,470
Available-for-sale, Fair Value | 15,446 | 15,375
Less than 12 months |  |
Available for sale - Amortized cost |  | 100,190
Available for sale - Unrealized Loss |  | 1,375
Available for sale - Fair Value |  | 98,815
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 197 | 203
Total Available for Sale Unrealized Loss | 22 | 24
Total Available for Sale Fair Value | 176 | 179
12 months or more |  |
Available for sale - Amortized cost | 197 | 81
Available for sale - Unrealized Loss | 22 | 11
Available-for-sale, Fair Value | 176 | 70
Less than 12 months |  |
Available for sale - Amortized cost |  | 122
Available for sale - Unrealized Loss |  | 13
Available for sale - Fair Value |  | 109
Obligation of US Government sponsored agencies at loss [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 7,796 | 10,691
Total Available for Sale Unrealized Loss | 34 | 42
Total Available for Sale Fair Value | 7,761 | 10,649
Less than 12 months |  |
Available for sale - Amortized cost | 7,796 | 10,691
Available for sale - Unrealized Loss | 34 | 42
Available for sale - Fair Value | 7,761 | 10,649
Other Debt Securities [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost |  | 20,000
Total Available for Sale Unrealized Loss |  | 320
Total Available for Sale Fair Value |  | 19,680
Less than 12 months |  |
Available for sale - Amortized cost |  | 20,000
Available for sale - Unrealized Loss |  | 320
Available for sale - Fair Value |  | $ 19,680

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