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Investment Securities (Gains and losses by category) (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 563,785 | $ 148,896
Available for sale - Amortized cost - more than 12 month | 200,843 | 220,334
Total Available for Sale Amortization cost | 764,628 | 369,230
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 10,292 | 942
Available for sale - Unrealized Loss - more than 12 month | 8,415 | 5,001
Total Available for Sale Unrealized Loss | 18,707 | 5,943
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 553,493 | 147,954
Available-for-sale, Fair Value - more than 12 month | 192,428 | 215,333
Total Available for Sale Fair Value | 745,921 | 363,287
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 140,464 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 324,963 | 352,399
Held to Maturity - Amortized Cost | 465,427 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 3,886 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 13,594 | 7,264
Held to Maturity- Unrealized Loss | 17,480 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 136,578 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 311,369 | 345,135
Held to Maturity - Fair Value | 447,947 | 497,681
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 1,230,055 | 875,294
Investment Securities - Unrealized Loss | 36,187 | 14,326
Investment Securities - Fair Value | 1,193,868 | 860,968
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 | 7,849 | 9,464
Available for sale - Amortized cost - more than 12 month | 66,298 | 72,562
Total Available for Sale Amortization cost | 74,147 | 82,026
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 170 | 98
Available for sale - Unrealized Loss - more than 12 month | 2,822 | 1,857
Total Available for Sale Unrealized Loss | 2,992 | 1,955
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 7,679 | 9,366
Available-for-sale, Fair Value - more than 12 month | 63,476 | 70,705
Total Available for Sale Fair Value | 71,155 | 80,071
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 | 0 | 2,455
Total Available for Sale Amortization cost | 0 | 2,455
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 0 | 362
Total Available for Sale Unrealized Loss | 0 | 362
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 0 | 2,093
Total Available for Sale Fair Value | 0 | 2,093
FNMA and FHLMC [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 413,181 | 125,107
Available for sale - Amortized cost - more than 12 month | 101,571 | 111,635
Total Available for Sale Amortization cost | 514,752 | 236,742
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 7,275 | 759
Available for sale - Unrealized Loss - more than 12 month | 4,296 | 2,122
Total Available for Sale Unrealized Loss | 11,571 | 2,881
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 405,906 | 124,348
Available-for-sale, Fair Value - more than 12 month | 97,275 | 109,513
Total Available for Sale Fair Value | 503,181 | 233,861
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 140,464 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 324,963 | 352,399
Held to Maturity - Amortized Cost | 465,427 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 3,886 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 13,594 | 7,264
Held to Maturity- Unrealized Loss | 17,480 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 136,578 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 311,369 | 345,135
Held to Maturity - Fair Value | 447,947 | 497,681
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 | 142,431 | 14,001
Available for sale - Amortized cost - more than 12 month | 20,388 | 20,803
Total Available for Sale Amortization cost | 162,819 | 34,804
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 2,847 | 85
Available for sale - Unrealized Loss - more than 12 month | 1,055 | 499
Total Available for Sale Unrealized Loss | 3,902 | 584
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 139,584 | 13,916
Available-for-sale, Fair Value - more than 12 month | 19,333 | 20,304
Total Available for Sale Fair Value | 158,917 | 34,220
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 - more than 12 month | 2,622 | 2,927
Total Available for Sale Amortization cost | 2,622 | 2,927
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 81 | 48
Total Available for Sale Unrealized Loss | 81 | 48
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 2,541 | 2,879
Total Available for Sale Fair Value | 2,541 | 2,879
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 | 324 | 324
Available for sale - Amortized cost - more than 12 month | 9,964 | 9,952
Total Available for Sale Amortization cost | 10,288 | 10,276
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 0 | 0
Available for sale - Unrealized Loss - more than 12 month | 161 | 113
Total Available for Sale Unrealized Loss | 161 | 113
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 324 | 324
Available-for-sale, Fair Value - more than 12 month | 9,803 | 9,839
Total Available for Sale Fair Value | $ 10,127 | $ 10,163

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