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Investment Securities (Gains and losses by category) (Details) - USD ($) | Mar. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost | $ 90,120,000 | $ 301,479,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | 1,601,000 | 8,349,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 88,519,000 | 293,130,000
12 months or more |  |
Available for sale - Amortized cost | 90,120,000 | 121,141,000
Available for sale - Unrealized Loss | 1,601,000 | 6,480,000
Available-for-sale, Fair Value | 88,519,000 | 114,661,000
Less than 12 months |  |
Available for sale - Amortized cost |  | 180,338,000
Available for sale - Unrealized Loss |  | 1,869,000
Available for sale - Fair Value |  | 178,469,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost | 113,922,000 | 493,519,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses | 92,000 | 5,936,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value | 113,830,000 | 487,583,000
Less than 12 months |  |
Held to Maturity - Amortized cost | 83,613,000 | 493,519,000
Held to Maturity - Unrealized Loss | 46,000 | 5,936,000
Held-to-Maturity - Fair Value | 83,567,000 | 487,583,000
More than 12 month [Abstract] |  |
Held to Maturity - Amortized cost | 120,429,000 |
Held to Maturity - Unrealized Loss | 1,647,000 |
Held-to-Maturity - Fair Value | 118,782,000 |
Investment Securities, Continuous Unrealized Loss Position [Abstract] |  |
Continuous Unrealized Loss on Investment, Amortized Cost | 204,042,000 | 794,998,000
Continuous Unrealized Loss On Investment Secuirities Agragatte Losses | 1,693,000 | 14,285,000
Investment Securities Continuous Unrealized Loss Position Fair Value | 202,349,000 | 780,713,000
CMO's issued by us government sponsored agenciesat loss |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost | 83,400,000 | 129,076,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | 728,000 | 2,741,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 82,672,000 | 126,335,000
12 months or more |  |
Available for sale - Amortized cost | 83,400,000 | 103,340,000
Available for sale - Unrealized Loss | 728,000 | 2,410,000
Available-for-sale, Fair Value | 82,672,000 | 100,930,000
Less than 12 months |  |
Available for sale - Amortized cost |  | 25,736,000
Available for sale - Unrealized Loss |  | 331,000
Available for sale - Fair Value |  | 25,405,000
Obligation of Puerto Rico Government and political subdivisions [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost | 6,720,000 | 17,801,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses | 873,000 | 4,070,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,847,000 | 13,731,000
12 months or more |  |
Available for sale - Amortized cost | 6,720,000 | 17,801,000
Available for sale - Unrealized Loss | 873,000 | 4,070,000
Available-for-sale, Fair Value | 5,847,000 | 13,731,000
FNMA and FHLMC [Member] |  |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost |  | 149,480,000
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses |  | 1,509,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value |  | 147,971,000
Less than 12 months |  |
Available for sale - Amortized cost |  | 149,480,000
Available for sale - Unrealized Loss |  | 1,509,000
Available for sale - Fair Value |  | 147,971,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost | 88,898,000 | 468,487,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses | 81,000 | 5,865,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value | 88,817,000 | 462,622,000
Less than 12 months |  |
Held to Maturity - Amortized cost | 58,589,000 | 468,487,000
Held to Maturity - Unrealized Loss | 35,000 | 5,865,000
Held-to-Maturity - Fair Value | 58,554,000 | 462,622,000
More than 12 month [Abstract] |  |
Held to Maturity - Amortized cost | 30,309,000 |
Held to Maturity - Unrealized Loss | 46,000 |
Held-to-Maturity - Fair Value | 30,263,000 |
Obligation of US Government sponsored agencies at loss [Member] |  |
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
US Treasury Securities [Member] |  |
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity Securities Continuous Unrealized Loss Position Amortized Cost | 25,024,000 | 25,032,000
Held to Maturity Securities Continuous Unrealized Loss Position Aggregate Losses | 11,000 | 71,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value | 25,013,000 | 24,961,000
Less than 12 months |  |
Held to Maturity - Amortized cost | 25,024,000 | 25,032,000
Held to Maturity - Unrealized Loss | 11,000 | 71,000
Held-to-Maturity - Fair Value | $ 25,013,000 | $ 24,961,000

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