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Investment Securities (Gains and losses by category) (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 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 | $ 266,288,000 | $ 335,079,000
Available for sale - Amortized cost - more than 12 month | 38,342,000 | 38,563,000
Total Available for Sale Amortization cost | 304,630,000 | 373,642,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 3,064,000 | 5,723,000
Available for sale - Unrealized Loss - more than 12 month | 708,000 | 1,400,000
Total Available for Sale Unrealized Loss | 3,772,000 | 7,123,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 263,224,000 | 329,356,000
Available-for-sale, Fair Value - more than 12 month | 37,634,000 | 37,163,000
Total Available for Sale Fair Value | 300,858,000 | 366,519,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 471,100,000 | 525,258,000
Held to Maturity - Amortized cost - more than 12 month | 6,753,000 |
Held to Maturity - Amortized Cost | 477,853,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 5,860,000 | 7,266,000
Held to Maturity- Unrealized Loss - more than 12 month | 164,000 |
Held to Maturity- Unrealized Loss | 6,024,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 465,240,000 | 517,992,000
Held-to-Maturity - Fair Value - more than 12 Month | 6,589,000 |
Held to Maturity - Fair Value | 471,829,000 | 517,992,000
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 782,483,000 | 898,900,000
Investment Securities - Unrealized Loss | 9,796,000 | 14,389,000
Investment Securities - Fair Value | 772,687,000 | 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 | 61,115,000 | 67,777,000
Available for sale - Amortized cost - more than 12 month | 30,309,000 | 33,883,000
Total Available for Sale Amortization cost | 91,424,000 | 101,660,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 736,000 | 1,430,000
Available for sale - Unrealized Loss - more than 12 month | 342,000 | 793,000
Total Available for Sale Unrealized Loss | 1,078,000 | 2,223,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 60,379,000 | 66,347,000
Available-for-sale, Fair Value - more than 12 month | 29,967,000 | 33,090,000
Total Available for Sale Fair Value | 90,346,000 | 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 | 339,000 | 607,000
Total Available for Sale Unrealized Loss | 339,000 | 607,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 4,341,000 | 4,073,000
Total Available for Sale Fair Value | 4,341,000 | 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 | 164,473,000 | 184,782,000
Total Available for Sale Amortization cost | 164,473,000 | 184,782,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 1,797,000 | 3,036,000
Total Available for Sale Unrealized Loss | 1,797,000 | 3,036,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 162,676,000 | 181,746,000
Total Available for Sale Fair Value | 162,676,000 | 181,746,000
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 471,100,000 | 525,258,000
Held to Maturity - Amortized cost - more than 12 month | 6,753,000 |
Held to Maturity - Amortized Cost | 477,853,000 | 525,258,000
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 5,860,000 | 7,266,000
Held to Maturity- Unrealized Loss - more than 12 month | 164,000 |
Held to Maturity- Unrealized Loss | 6,024,000 | 7,266,000
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 465,240,000 | 517,992,000
Held-to-Maturity - Fair Value - more than 12 Month | 6,589,000 |
Held to Maturity - Fair Value | 471,829,000 | 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 | 30,437,000 | 29,445,000
Total Available for Sale Amortization cost | 30,437,000 | 29,445,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 487,000 | 620,000
Total Available for Sale Unrealized Loss | 487,000 | 620,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 29,950,000 | 28,825,000
Total Available for Sale Fair Value | 29,950,000 | 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 | 3,353,000 |
Total Available for Sale Amortization cost | 3,353,000 | 3,903,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month |  | 618,000
Available for sale - Unrealized Loss - more than 12 month | 27,000 |
Total Available for Sale Unrealized Loss | 27,000 | 618,000
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 | 3,326,000 |
Total Available for Sale Fair Value | 3,326,000 | 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 | 10,263,000 | 49,172,000
Total Available for Sale Amortization cost | 10,263,000 | 49,172,000
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 44,000 | 618,000
Total Available for Sale Unrealized Loss | 44,000 | 618,000
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 10,219,000 | 48,554,000
Total Available for Sale Fair Value | $ 10,219,000 | $ 48,554,000

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