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Investment Securities (Gains and losses by category) (Details) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | $ 794,998,000 | $ 357,228,000
Total Available for Sale Unrealized Loss | 14,285,000 | 9,631,000
Total Available for Sale Fair Value | 780,713,000 | 347,597,000
12 months or more |  |
Available for sale - Amortized cost | 121,141,000 | 278,320,000
Available for sale - Unrealized Loss | 6,480,000 | 9,533,000
Available-for-sale, Fair Value | 114,661,000 | 268,787,000
Less than 12 months |  |
Available for sale - Amortized cost | 673,857,000 | 78,908,000
Available for sale - Unrealized Loss | 7,805,000 | 98,000
Available for sale - Fair Value | 666,052,000 | 78,810,000
CMO's issued by us government sponsored agenciesat loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 129,076,000 | 159,100,000
Total Available for Sale Unrealized Loss | 2,741,000 | 3,153,000
Total Available for Sale Fair Value | 126,335,000 | 155,947,000
12 months or more |  |
Available for sale - Amortized cost | 103,340,000 | 143,928,000
Available for sale - Unrealized Loss | 2,410,000 | 3,086,000
Available-for-sale, Fair Value | 100,930,000 | 140,842,000
Less than 12 months |  |
Available for sale - Amortized cost | 25,736,000 | 15,172,000
Available for sale - Unrealized Loss | 331,000 | 67,000
Available for sale - Fair Value | 25,405,000 | 15,105,000
Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 17,801,000 | 20,939,000
Total Available for Sale Unrealized Loss | 4,070,000 | 5,267,000
Total Available for Sale Fair Value | 13,731,000 | 15,672,000
12 months or more |  |
Available for sale - Amortized cost | 17,801,000 | 20,939,000
Available for sale - Unrealized Loss | 4,070,000 | 5,267,000
Available-for-sale, Fair Value | 13,731,000 | 15,672,000
FNMA and FHLMC [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 149,480,000 | 177,112,000
Total Available for Sale Unrealized Loss | 1,509,000 | 1,203,000
Total Available for Sale Fair Value | 147,971,000 | 175,909,000
12 months or more |  |
Available for sale - Amortized cost |  | 113,376,000
Available for sale - Unrealized Loss |  | 1,172,000
Available-for-sale, Fair Value |  | 112,204,000
Less than 12 months |  |
Available for sale - Amortized cost | 149,480,000 | 63,736,000
Available for sale - Unrealized Loss | 1,509,000 | 31,000
Available for sale - Fair Value | 147,971,000 | 63,705,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 0 | 77,000
Total Available for Sale Unrealized Loss | 0 | 8,000
Total Available for Sale Fair Value | 0 | 69,000
12 months or more |  |
Available for sale - Amortized cost |  | 77,000
Available for sale - Unrealized Loss |  | 8,000
Available-for-sale, Fair Value |  | $ 69,000
Less than 12 months |  |
Available for sale - Amortized cost | 0 |
Available for sale - Unrealized Loss | 0 |
Available for sale - Fair Value | 0 |
Obligation of US Government sponsored agencies at loss [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Total Available for Sale Amortization cost | 5,122,000 |
Total Available for Sale Unrealized Loss | 29,000 |
Total Available for Sale Fair Value | 5,093,000 |
Less than 12 months |  |
Available for sale - Amortized cost | 5,122,000 |
Available for sale - Unrealized Loss | 29,000 |
Available for sale - Fair Value | $ 5,093,000 |

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References No definition available. + Details
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- Definition This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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