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Investment Securities (Gains and losses by category) (Details) - USD ($) $ in Thousands | Dec. 31, 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 | $ 127,221 | $ 148,896
Available for sale - Amortized cost - more than 12 month | 567,531 | 220,334
Total Available for Sale Amortization cost | 694,752 | 369,230
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 436 | 942
Available for sale - Unrealized Loss - more than 12 month | 13,687 | 5,001
Total Available for Sale Unrealized Loss | 14,123 | 5,943
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 126,785 | 147,954
Available-for-sale, Fair Value - more than 12 month | 553,844 | 215,333
Total Available for Sale Fair Value | 680,629 | 363,287
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 0 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 424,740 | 352,399
Held to Maturity - Amortized Cost | 424,740 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 0 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 14,387 | 7,264
Held to Maturity- Unrealized Loss | 14,387 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 0 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 410,353 | 345,135
Held to Maturity - Fair Value | 410,353 | 497,681
Investment Securities Continuous Unrealized Loss Position [Abstract] |  |
Investment Securities - Amortized Cost | 1,119,492 | 875,294
Investment Securities - Fair Value | 1,090,982 | 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 | 0 | 9,464
Available for sale - Amortized cost - more than 12 month | 66,230 | 72,562
Total Available for Sale Amortization cost | 66,230 | 82,026
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 0 | 98
Available for sale - Unrealized Loss - more than 12 month | 2,166 | 1,857
Total Available for Sale Unrealized Loss | 2,166 | 1,955
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 0 | 9,366
Available-for-sale, Fair Value - more than 12 month | 64,064 | 70,705
Total Available for Sale Fair Value | 64,064 | 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 [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 | 109,772 | 125,107
Available for sale - Amortized cost - more than 12 month | 357,955 | 111,635
Total Available for Sale Amortization cost | 467,727 | 236,742
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 348 | 759
Available for sale - Unrealized Loss - more than 12 month | 8,603 | 2,122
Total Available for Sale Unrealized Loss | 8,951 | 2,881
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 109,424 | 124,348
Available-for-sale, Fair Value - more than 12 month | 349,352 | 109,513
Total Available for Sale Fair Value | 458,776 | 233,861
Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Held to Maturity - Amortized cost - less than 12 month | 0 | 153,665
Held to Maturity - Amortized cost - more than 12 month | 424,740 | 352,399
Held to Maturity - Amortized Cost | 424,740 | 506,064
Held To Maturity Securities, Continuous Unrealized Loss Position Aggregate Losses [Abstract] |  |
Held to Maturity- Unrealized Loss - less than 12 month | 0 | 1,119
Held to Maturity- Unrealized Loss - more than 12 month | 14,387 | 7,264
Held to Maturity- Unrealized Loss | 14,387 | 8,383
Held To Maturity Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Held-to-Maturity - Fair Value - less than 12 Month | 0 | 152,546
Held-to-Maturity - Fair Value - more than 12 Month | 410,353 | 345,135
Held to Maturity - Fair Value | 410,353 | 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 | 17,126 | 14,001
Available for sale - Amortized cost - more than 12 month | 131,044 | 20,803
Total Available for Sale Amortization cost | 148,170 | 34,804
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 88 | 85
Available for sale - Unrealized Loss - more than 12 month | 2,739 | 499
Total Available for Sale Unrealized Loss | 2,827 | 584
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 17,038 | 13,916
Available-for-sale, Fair Value - more than 12 month | 128,305 | 20,304
Total Available for Sale Fair Value | 145,343 | 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 | 2,325 | 2,927
Total Available for Sale Amortization cost | 2,325 | 2,927
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 60 | 48
Total Available for Sale Unrealized Loss | 60 | 48
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 2,265 | 2,879
Total Available for Sale Fair Value | 2,265 | 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 | 323 | 324
Available for sale - Amortized cost - more than 12 month | 9,977 | 9,952
Total Available for Sale Amortization cost | 10,300 | 10,276
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 0 | 0
Available for sale - Unrealized Loss - more than 12 month | 119 | 113
Total Available for Sale Unrealized Loss | 119 | 113
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 323 | 324
Available-for-sale, Fair Value - more than 12 month | 9,858 | 9,839
Total Available for Sale Fair Value | $ 10,181 | $ 10,163

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