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Investment Securities (Gains and losses by category) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 213,503,000 | $ 335,079,000
Available for sale - Amortized cost - more than 12 month | 72,100,000 | 38,563,000
Total Available for Sale Amortization cost | 285,603,000 | 373,642,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1,930,000 | 5,723,000
Available for sale - Unrealized Loss - more than 12 month | 1,322,000 | 1,400,000
Total Available for Sale Unrealized Loss | 3,252,000 | 7,123,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 211,573,000 | 329,356,000
Available-for-sale, Fair Value - more than 12 month | 70,778,000 | 37,163,000
Total Available for Sale Fair Value | 282,351,000 | 366,519,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 386,995,000 | 525,258,000
Held to Maturity - Amortized cost - more than 12 month | 44,759,000 |
Held to Maturity - Amortized Cost | 431,754,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 3,831,000 | 7,266,000
Held to Maturity- Unrealized Loss - more than 12 month | 884,000 |
Held to Maturity- Unrealized Loss | 4,715,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 383,164,000 | 517,992,000
Held-to-Maturity - Fair Value - more than 12 Month | 43,875,000 |
Held to Maturity - Fair Value | 427,039,000 | 517,992,000
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 717,357,000 | 898,900,000
Investment Securities - Unrealized Loss | 7,967,000 | 14,389,000
Investment Securities - Fair Value | 709,390,000 | 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 | 27,413,000 | 67,777,000
Available for sale - Amortized cost - more than 12 month | 58,328,000 | 33,883,000
Total Available for Sale Amortization cost | 85,741,000 | 101,660,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 169,000 | 1,430,000
Available for sale - Unrealized Loss - more than 12 month | 869,000 | 793,000
Total Available for Sale Unrealized Loss | 1,038,000 | 2,223,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 27,244,000 | 66,347,000
Available-for-sale, Fair Value - more than 12 month | 57,459,000 | 33,090,000
Total Available for Sale Fair Value | 84,703,000 | 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 | 2,455,000 | 4,680,000
Total Available for Sale Amortization cost | 2,455,000 | 4,680,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 249,000 | 607,000
Total Available for Sale Unrealized Loss | 249,000 | 607,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 2,206,000 | 4,073,000
Total Available for Sale Fair Value | 2,206,000 | 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 | 146,578,000 | 184,782,000
Available for sale - Amortized cost - more than 12 month | 8,196,000 |
Total Available for Sale Amortization cost | 154,774,000 | 184,782,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1,287,000 | 3,036,000
Available for sale - Unrealized Loss - more than 12 month | 175,000 |
Total Available for Sale Unrealized Loss | 1,462,000 | 3,036,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 145,291,000 | 181,746,000
Available-for-sale, Fair Value - more than 12 month | 8,021,000 |
Total Available for Sale Fair Value | 153,312,000 | 181,746,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 386,995,000 | 525,258,000
Held to Maturity - Amortized cost - more than 12 month | 44,759,000 |
Held to Maturity - Amortized Cost | 431,754,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 3,831,000 | 7,266,000
Held to Maturity- Unrealized Loss - more than 12 month | 884,000 |
Held to Maturity- Unrealized Loss | 4,715,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 383,164,000 | 517,992,000
Held-to-Maturity - Fair Value - more than 12 Month | 43,875,000 |
Held to Maturity - Fair Value | 427,039,000 | 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 | 29,243,000 | 29,445,000
Total Available for Sale Amortization cost | 29,243,000 | 29,445,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 423,000 | 620,000
Total Available for Sale Unrealized Loss | 423,000 | 620,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 28,820,000 | 28,825,000
Total Available for Sale Fair Value | 28,820,000 | 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 |  | 3,903,000
Available for sale - Amortized cost - more than 12 month | 3,121,000 |
Total Available for Sale Amortization cost | 3,121,000 | 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
Available for sale - Unrealized Loss - more than 12 month | 29,000 |
Total Available for Sale Unrealized Loss | 29,000 | 19,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month |  | 3,884,000
Available-for-sale, Fair Value - more than 12 month | 3,092,000 |
Total Available for Sale Fair Value | 3,092,000 | 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 | 10,269,000 | 49,172,000
Total Available for Sale Amortization cost | 10,269,000 | 49,172,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 51,000 | 618,000
Total Available for Sale Unrealized Loss | 51,000 | 618,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 10,218,000 | 48,554,000
Total Available for Sale Fair Value | $ 10,218,000 | $ 48,554,000

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