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Investment Securities (Unrealized Gains and Losses by Category) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | $ 39,732 | $ 20,598
Available for sale - Amortized cost - more than 12 month | 0 | 296,502
Total Available for Sale Amortization cost | 39,732 | 317,100
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 210 | 109
Available for sale - Unrealized Loss - more than 12 month | 0 | 1,808
Total Available for Sale Unrealized Loss | 210 | 1,917
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 39,522 | 20,489
Available-for-sale, Fair Value - more than 12 month | 0 | 294,694
Total Available for Sale Fair Value | 39,522 | 315,183
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 | 11,503
Available for sale - Amortized cost - more than 12 month | 0 | 35,417
Total Available for Sale Amortization cost | 0 | 46,920
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 0 | 103
Available for sale - Unrealized Loss - more than 12 month | 0 | 387
Total Available for Sale Unrealized Loss | 0 | 490
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 0 | 11,400
Available-for-sale, Fair Value - more than 12 month | 0 | 35,030
Total Available for Sale Fair Value | 0 | 46,430
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 |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month | 0 |
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month | 0 |
FNMA and FHLMC [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - less than 12 month | 34,628 | 4,919
Available for sale - Amortized cost - more than 12 month | 0 | 259,099
Total Available for Sale Amortization cost | 34,628 | 264,018
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 32 | 2
Available for sale - Unrealized Loss - more than 12 month | 0 | 1,415
Total Available for Sale Unrealized Loss | 32 | 1,417
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 34,596 | 4,917
Available-for-sale, Fair Value - more than 12 month | 0 | 257,684
Total Available for Sale Fair Value | 34,596 | 262,601
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 | 5,104 | 3,549
Available for sale - Amortized cost - more than 12 month | 0 | 19
Total Available for Sale Amortization cost | 5,104 | 3,568
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - less than 12 month | 178 | 4
Available for sale - Unrealized Loss - more than 12 month | 0 | 0
Total Available for Sale Unrealized Loss | 178 | 4
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 4,926 | 3,545
Available-for-sale, Fair Value - more than 12 month | 0 | 19
Total Available for Sale Fair Value | 4,926 | 3,564
Obligation of US Government Sponsored Agencies [Member] |  |
Available For Sale Securities Continuous Unrealized Loss Position Amortized Cost [Abstract] |  |
Available for sale - Amortized cost - more than 12 month |  | 1,967
Total Available for Sale Amortization cost | 0 | 1,967
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Available for sale - Unrealized Loss - more than 12 month |  | 6
Total Available for Sale Unrealized Loss | 0 | 6
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available-for-sale, Fair Value - more than 12 month |  | 1,961
Total Available for Sale Fair Value | 0 | 1,961
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 | 0 | 627
Available for sale - Amortized cost - more than 12 month | 0 |
Total Available for Sale Amortization cost | 0 | 627
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 | 0 |
Total Available for Sale Unrealized Loss | 0 | 0
Available For Sale Securities Continuous Unrealized Loss Position Fair Value [Abstract] |  |
Available for sale - Fair Value - less than 12 month | 0 | 627
Available-for-sale, Fair Value - more than 12 month | 0 |
Total Available for Sale Fair Value | $ 0 | $ 627

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