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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | $ 2,743,002 | $ 3,396,378
Less than 12 months Gross Unrealized Losses | 11,032 | 7,003
12 months or more Fair Value | 2,647,359 | 6,998,793
12 months or more Gross Unrealized Losses | 28,785 | 202,304
Total Fair Value | 5,390,361 | 10,395,171
Total Gross Unrealized Losses | 39,817 | 209,307
US Treasury Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 2,439,114 | 3,189,007
Less than 12 months Gross Unrealized Losses | 9,798 | 4,188
12 months or more Fair Value | 452,784 | 2,607,276
12 months or more Gross Unrealized Losses | 808 | 36,343
Total Fair Value | 2,891,898 | 5,796,283
Total Gross Unrealized Losses | 10,606 | 40,531
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 9,973 | 14,847
Less than 12 months Gross Unrealized Losses | 4 | 46
12 months or more Fair Value | 99,846 | 318,271
12 months or more Gross Unrealized Losses | 107 | 3,454
Total Fair Value | 109,819 | 333,118
Total Gross Unrealized Losses | 111 | 3,500
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value |  | 0
Less than 12 months Gross Unrealized Losses |  | 0
12 months or more Fair Value |  | 6,742
12 months or more Gross Unrealized Losses |  | 184
Total Fair Value |  | 6,742
Total Gross Unrealized Losses |  | 184
Collateralized Mortgage Obligations - Federal agencies |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 114,603 | 66,652
Less than 12 months Gross Unrealized Losses | 537 | 489
12 months or more Fair Value | 310,315 | 587,869
12 months or more Gross Unrealized Losses | 7,016 | 27,913
Total Fair Value | 424,918 | 654,521
Total Gross Unrealized Losses | 7,553 | 28,402
Mortgage Backed Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 179,312 | 125,872
Less than 12 months Gross Unrealized Losses | 693 | 2,280
12 months or more Fair Value | 1,784,414 | 3,478,635
12 months or more Gross Unrealized Losses | 20,854 | 134,410
Total Fair Value | 1,963,726 | 3,604,507
Total Gross Unrealized Losses | $ 21,547 | $ 136,690

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=118942371&loc=SL82922954-210456 + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922890-210455 + Details
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