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Investment Securities (Gains and losses by category) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Available for sale - Amortized cost - less than 12 month |  | $ 180,338 |
Available for sale - Amortized cost - more than 12 month | $ 61,169 | 121,141 |
Total Available for Sale Amortization cost | 61,169 | 301,479 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Available for sale - Unrealized Loss - less than 12 month |  | 1,869 |
Available for sale - Unrealized Loss - more than 12 month | 1,051 | 6,480 |
Total Available for Sale Unrealized Loss | 1,051 | 8,349 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Available for sale - Fair Value - less than 12 month |  | 178,469 |
Available-for-sale, Fair Value - more than 12 month | 60,118 | 114,661 |
Total Available for Sale Fair Value | 60,118 | 293,130 |
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Held to Maturity - Amortized cost - less than 12 month |  | 493,519 |
Held to Maturity - Amortized Cost |  | 493,519 |
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Held to Maturity- Unrealized Loss - more than 12 month |  | 5,936 |
Held to Maturity- Unrealized Loss |  | 5,936 |
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Held-to-Maturity - Fair Value - less than 12 Month |  | 487,583 |
Held to Maturity - Fair Value |  | 487,583 |
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |  |
Investment Securities - Amortized Cost - less than 12 month |  | 673,857 |
Investment Securities - Amortized Cost - more than 12 month | 61,169 | 121,141 |
Investment Securities - Amortized Cost | 61,169 | 794,998 | $ 61,169
Investment Securities - Unrealized Position - less than 12 month |  | 7,805 |
Investment Securities - Unrealized Position - more than 12 month | 1,051 | 6,480 |
Investment Securities - Unrealized Loss | 1,051 | 14,285 |
Investment Securities - Fair Value - less than 12 month |  | 666,052 |
Investment Securities - Fair Value - more than 12 month | 60,118 | 114,661 |
Investment Securities - Fair Value | 60,118 | 780,713 | $ 60,118
CMO's issued by us government sponsored agencies at loss |  |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Available for sale - Amortized cost - less than 12 month |  | 25,736 |
Available for sale - Amortized cost - more than 12 month | 54,449 | 103,340 |
Total Available for Sale Amortization cost | 54,449 | 129,076 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Available for sale - Unrealized Loss - less than 12 month |  | 331 |
Available for sale - Unrealized Loss - more than 12 month | 179 | 2,410 |
Total Available for Sale Unrealized Loss | 179 | 2,741 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Available for sale - Fair Value - less than 12 month |  | 25,405 |
Available-for-sale, Fair Value - more than 12 month | 54,270 | 100,930 |
Total Available for Sale Fair Value | 54,270 | 126,335 |
Obligation of Puerto Rico Government and public instrumentalities at loss |  |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Available for sale - Amortized cost - more than 12 month | 6,720 | 17,801 |
Total Available for Sale Amortization cost | 6,720 | 17,801 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Available for sale - Unrealized Loss - more than 12 month | 872 | 4,070 |
Total Available for Sale Unrealized Loss | 872 | 4,070 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Available-for-sale, Fair Value - more than 12 month | 5,848 | 13,731 |
Total Available for Sale Fair Value | $ 5,848 | 13,731 |
FNMA and FHLMC [Member] |  |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Available for sale - Amortized cost - less than 12 month |  | 149,480 |
Total Available for Sale Amortization cost |  | 149,480 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Available for sale - Unrealized Loss - less than 12 month |  | 1,509 |
Total Available for Sale Unrealized Loss |  | 1,509 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Available for sale - Fair Value - less than 12 month |  | 147,971 |
Total Available for Sale Fair Value |  | 147,971 |
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Held to Maturity - Amortized cost - less than 12 month |  | 468,487 |
Held to Maturity - Amortized Cost |  | 468,487 |
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Held to Maturity- Unrealized Loss - more than 12 month |  | 5,865 |
Held to Maturity- Unrealized Loss |  | 5,865 |
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Held-to-Maturity - Fair Value - less than 12 Month |  | 462,622 |
Held to Maturity - Fair Value |  | 462,622 |
Obligation of US Government sponsored agencies at loss [Member] |  |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Available for sale - Amortized cost - less than 12 month |  | 5,122 |
Total Available for Sale Amortization cost |  | 5,122 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Available for sale - Unrealized Loss - less than 12 month |  | 29 |
Total Available for Sale Unrealized Loss |  | 29 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Available for sale - Fair Value - less than 12 month |  | 5,093 |
US Treasury Securities at loss |  |  |
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |  |
Held to Maturity - Amortized cost - less than 12 month |  | 25,032 |
Held to Maturity - Amortized Cost |  | 25,032 |
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |  |
Held to Maturity- Unrealized Loss - more than 12 month |  | 71 |
Held to Maturity- Unrealized Loss |  | 71 |
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |  |
Held-to-Maturity - Fair Value - less than 12 Month |  | 24,961 |
Held to Maturity - Fair Value |  | $ 24,961 |

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