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Investment Securities (Gains and losses by category) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 572,178 | $ 148,896
Available for sale - Amortized cost - more than 12 month | 270,131 | 220,334
Total Available for Sale Amortization cost | 842,309 | 369,230
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 12,193 | 942
Available for sale - Unrealized Loss - more than 12 month | 12,477 | 5,001
Total Available for Sale Unrealized Loss | 24,670 | 5,943
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 559,985 | 147,954
Available-for-sale, Fair Value - more than 12 month | 257,654 | 215,333
Total Available for Sale Fair Value | 817,639 | 363,287
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 62,738 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 381,941 | 352,399
Held to Maturity - Amortized Cost | 444,679 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 1,994 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 17,619 | 7,264
Held to Maturity- Unrealized Loss | 19,613 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 60,744 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 364,322 | 345,135
Held to Maturity - Fair Value | 425,066 | 497,681
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 1,286,988 | 875,294
Investment Securities - Fair Value | 1,242,705 | 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 | 1,000 | 9,464
Available for sale - Amortized cost - more than 12 month | 68,960 | 72,562
Total Available for Sale Amortization cost | 69,960 | 82,026
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 20 | 98
Available for sale - Unrealized Loss - more than 12 month | 3,174 | 1,857
Total Available for Sale Unrealized Loss | 3,194 | 1,955
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 980 | 9,366
Available-for-sale, Fair Value - more than 12 month | 65,786 | 70,705
Total Available for Sale Fair Value | 66,766 | 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 |  | 362
Total Available for Sale Unrealized Loss |  | 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 | 425,094 | 125,107
Available for sale - Amortized cost - more than 12 month | 160,420 | 111,635
Total Available for Sale Amortization cost | 585,514 | 236,742
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 8,348 | 759
Available for sale - Unrealized Loss - more than 12 month | 7,451 | 2,122
Total Available for Sale Unrealized Loss | 15,799 | 2,881
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 416,746 | 124,348
Available-for-sale, Fair Value - more than 12 month | 152,969 | 109,513
Total Available for Sale Fair Value | 569,715 | 233,861
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 62,738 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 381,941 | 352,399
Held to Maturity - Amortized Cost | 444,679 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 1,994 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 17,619 | 7,264
Held to Maturity- Unrealized Loss | 19,613 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 60,744 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 364,322 | 345,135
Held to Maturity - Fair Value | 425,066 | 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 | 145,438 | 14,001
Available for sale - Amortized cost - more than 12 month | 28,296 | 20,803
Total Available for Sale Amortization cost | 173,734 | 34,804
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 3,825 | 85
Available for sale - Unrealized Loss - more than 12 month | 1,606 | 499
Total Available for Sale Unrealized Loss | 5,431 | 584
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 141,613 | 13,916
Available-for-sale, Fair Value - more than 12 month | 26,690 | 20,304
Total Available for Sale Fair Value | 168,303 | 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 | 2,484 | 2,927
Total Available for Sale Amortization cost | 2,484 | 2,927
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 89 | 48
Total Available for Sale Unrealized Loss | 89 | 48
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 2,395 | 2,879
Total Available for Sale Fair Value | 2,395 | 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 | 646 | 324
Available for sale - Amortized cost - more than 12 month | 9,971 | 9,952
Total Available for Sale Amortization cost | 10,617 | 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 | 157 | 113
Total Available for Sale Unrealized Loss | 157 | 113
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 646 | 324
Available-for-sale, Fair Value - more than 12 month | 9,814 | 9,839
Total Available for Sale Fair Value | $ 10,460 | $ 10,163

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