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Investment Securities (Gains and losses by category) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 315,912,000 | $ 335,079,000
Available for sale - Amortized cost - more than 12 month | 36,622,000 | 38,563,000
Total Available for Sale Amortization cost | 352,534,000 | 373,642,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 4,483,000 | 5,723,000
Available for sale - Unrealized Loss - more than 12 month | 997,000 | 1,400,000
Total Available for Sale Unrealized Loss | 5,480,000 | 7,123,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 311,429,000 | 329,356,000
Available-for-sale, Fair Value - more than 12 month | 35,625,000 | 37,163,000
Total Available for Sale Fair Value | 347,054,000 | 366,519,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 501,949,000 | 525,258,000
Held to Maturity - Amortized Cost | 501,949,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 7,152,000 | 7,266,000
Held to Maturity- Unrealized Loss | 7,152,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 494,797,000 | 517,992,000
Held to Maturity - Fair Value | 494,797,000 | 517,992,000
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 854,483,000 | 898,900,000
Investment Securities - Unrealized Loss | 12,632,000 | 14,389,000
Investment Securities - Fair Value | 841,851,000 | 884,511,000
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 | 55,117,000 | 67,777,000
Available for sale - Amortized cost - more than 12 month | 31,942,000 | 33,883,000
Total Available for Sale Amortization cost | 87,059,000 | 101,660,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1,046,000 | 1,430,000
Available for sale - Unrealized Loss - more than 12 month | 564,000 | 793,000
Total Available for Sale Unrealized Loss | 1,610,000 | 2,223,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 54,071,000 | 66,347,000
Available-for-sale, Fair Value - more than 12 month | 31,378,000 | 33,090,000
Total Available for Sale Fair Value | 85,449,000 | 99,437,000
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 | 4,680,000
Total Available for Sale Amortization cost | 4,680,000 | 4,680,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 433,000 | 607,000
Total Available for Sale Unrealized Loss | 433,000 | 607,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 4,247,000 | 4,073,000
Total Available for Sale Fair Value | 4,247,000 | 4,073,000
FNMA and FHLMC [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 177,258,000 | 184,782,000
Total Available for Sale Amortization cost | 177,258,000 | 184,782,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 2,165,000 | 3,036,000
Total Available for Sale Unrealized Loss | 2,165,000 | 3,036,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 175,093,000 | 181,746,000
Total Available for Sale Fair Value | 175,093,000 | 181,746,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 501,949,000 | 525,258,000
Held to Maturity - Amortized Cost | 501,949,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 7,152,000 | 7,266,000
Held to Maturity- Unrealized Loss | 7,152,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 494,797,000 | 517,992,000
Held to Maturity - Fair Value | 494,797,000 | 517,992,000
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 | 30,727,000 | 29,445,000
Total Available for Sale Amortization cost | 30,727,000 | 29,445,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 727,000 | 620,000
Total Available for Sale Unrealized Loss | 727,000 | 620,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 30,000,000 | 28,825,000
Total Available for Sale Fair Value | 30,000,000 | 28,825,000
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 | 3,604,000 | 3,903,000
Total Available for Sale Amortization cost | 3,604,000 | 3,903,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 19,000 | 618,000
Total Available for Sale Unrealized Loss | 19,000 | 618,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 3,585,000 | 3,884,000
Total Available for Sale Fair Value | 3,585,000 | 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 | 49,206,000 | 49,172,000
Total Available for Sale Amortization cost | 49,206,000 | 49,172,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 526,000 | 618,000
Total Available for Sale Unrealized Loss | 526,000 | 618,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 48,680,000 | 48,554,000
Total Available for Sale Fair Value | $ 48,680,000 | $ 48,554,000

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