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Investment Securities (Gains and losses by category) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 335,079,000 | $ 180,338,000
Available for sale - Amortized cost - more than 12 month | 38,563,000 | 121,141,000
Total Available for Sale Amortization cost | 373,642,000 | 301,479,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 5,723,000 | 1,869,000
Available for sale - Unrealized Loss - more than 12 month | 1,400,000 | 6,480,000
Total Available for Sale Unrealized Loss | 7,123,000 | 8,349,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 329,356,000 | 178,469,000
Available-for-sale, Fair Value - more than 12 month | 37,163,000 | 114,661,000
Total Available for Sale Fair Value | 366,519,000 | 293,130,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 525,258,000 | 493,519,000
Held to Maturity - Amortized Cost | 525,258,000 | 493,519,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 7,266,000 | 5,936,000
Held to Maturity- Unrealized Loss | 7,266,000 | 5,936,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 517,992,000 | 487,583,000
Held to Maturity - Fair Value | 517,992,000 | 487,583,000
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 898,900,000 | 794,998,000
Investment Securities - Unrealized Loss | 14,389,000 | 14,285,000
Investment Securities - Fair Value | 884,511,000 | 780,713,000
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 | 67,777,000 | 25,736,000
Available for sale - Amortized cost - more than 12 month | 33,883,000 | 103,340,000
Total Available for Sale Amortization cost | 101,660,000 | 129,076,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1,430,000 | 331,000
Available for sale - Unrealized Loss - more than 12 month | 793,000 | 2,410,000
Total Available for Sale Unrealized Loss | 2,223,000 | 2,741,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 66,347,000 | 25,405,000
Available-for-sale, Fair Value - more than 12 month | 33,090,000 | 100,930,000
Total Available for Sale Fair Value | 99,437,000 | 126,335,000
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 | 4,680,000 | 17,801,000
Total Available for Sale Amortization cost | 4,680,000 | 17,801,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 607,000 | 4,070,000
Total Available for Sale Unrealized Loss | 607,000 | 4,070,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 4,073,000 | 13,731,000
Total Available for Sale Fair Value | 4,073,000 | 13,731,000
FNMA and FHLMC [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 184,782,000 | 149,480,000
Total Available for Sale Amortization cost | 184,782,000 | 149,480,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 3,036,000 | 1,509,000
Available for sale - Unrealized Loss - more than 12 month |  | 0
Total Available for Sale Unrealized Loss | 3,036,000 | 1,509,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 181,746,000 | 147,971,000
Total Available for Sale Fair Value | 181,746,000 | 147,971,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 525,258,000 | 468,487,000
Held to Maturity - Amortized Cost | 525,258,000 | 468,487,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 7,266,000 | 5,865,000
Held to Maturity- Unrealized Loss | 7,266,000 | 5,865,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 517,992,000 | 462,622,000
Held to Maturity - Fair Value | 517,992,000 | 462,622,000
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 29,445,000 |
Total Available for Sale Amortization cost | 29,445,000 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 620,000 |
Total Available for Sale Unrealized Loss | 620,000 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 28,825,000 | 5,093,000
Total Available for Sale Fair Value | 28,825,000 | 5,093,000
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 | 3,903,000 | 5,122,000
Total Available for Sale Amortization cost | 3,903,000 | 5,122,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 19,000 | 29,000
Total Available for Sale Unrealized Loss | 19,000 | 29,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 3,884,000 |
Total Available for Sale Fair Value | 3,884,000 |
US Treasury Securities at loss |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 49,172,000 |
Total Available for Sale Amortization cost | 49,172,000 |
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 618,000 |
Total Available for Sale Unrealized Loss | 618,000 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 48,554,000 |
Total Available for Sale Fair Value | $ 48,554,000 |
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month |  | 25,032,000
Held to Maturity - Amortized Cost |  | 25,032,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month |  | 71,000
Held to Maturity- Unrealized Loss |  | 71,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month |  | 24,961,000
Held to Maturity - Fair Value |  | $ 24,961,000

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