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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | $ 1,191,590 | $ 3,396,378
Less than 12 months Gross Unrealized Losses | 3,348 | 7,003
12 months or more Fair Value | 3,143,625 | 6,998,793
12 months or more Gross Unrealized Losses | 32,949 | 202,304
Total Fair Value | 4,335,215 | 10,395,171
Total Gross Unrealized Losses | 36,297 | 209,307
US Treasury Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 900,818 | 3,189,007
Less than 12 months Gross Unrealized Losses | 2,376 | 4,188
12 months or more Fair Value | 639,001 | 2,607,276
12 months or more Gross Unrealized Losses | 2,135 | 36,343
Total Fair Value | 1,539,819 | 5,796,283
Total Gross Unrealized Losses | 4,511 | 40,531
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 9,947 | 14,847
Less than 12 months Gross Unrealized Losses | 25 | 46
12 months or more Fair Value | 176,356 | 318,271
12 months or more Gross Unrealized Losses | 380 | 3,454
Total Fair Value | 186,303 | 333,118
Total Gross Unrealized Losses | 405 | 3,500
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 0 | 0
Less than 12 months Gross Unrealized Losses | 0 | 0
12 months or more Fair Value | 6,931 | 6,742
12 months or more Gross Unrealized Losses | 44 | 184
Total Fair Value | 6,931 | 6,742
Total Gross Unrealized Losses | 44 | 184
Collateralized Mortgage Obligations - Federal agencies |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 103,443 | 66,652
Less than 12 months Gross Unrealized Losses | 467 | 489
12 months or more Fair Value | 343,994 | 587,869
12 months or more Gross Unrealized Losses | 6,495 | 27,913
Total Fair Value | 447,437 | 654,521
Total Gross Unrealized Losses | 6,962 | 28,402
Mortgage Backed Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 177,382 | 125,872
Less than 12 months Gross Unrealized Losses | 480 | 2,280
12 months or more Fair Value | 1,977,343 | 3,478,635
12 months or more Gross Unrealized Losses | 23,895 | 134,410
Total Fair Value | 2,154,725 | 3,604,507
Total Gross Unrealized Losses | $ 24,375 | $ 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. + 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=82897076&loc=d3e27337-111563 + 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. + 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=82897076&loc=d3e27337-111563 + Details
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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 less than 12 months. + 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=82897076&loc=d3e27337-111563 + Details
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