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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | $ 890,461 | $ 2,743,002
Less than 12 months Gross Unrealized Losses | 1,877 | 11,032
12 months or more Fair Value | 555 | 2,647,359
12 months or more Gross Unrealized Losses | 11 | 28,785
Total Fair Value | 891,016 | 5,390,361
Total Gross Unrealized Losses | 1,888 | 39,817
US Treasury Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value |  | 2,439,114
Less than 12 months Gross Unrealized Losses |  | 9,798
12 months or more Fair Value |  | 452,784
12 months or more Gross Unrealized Losses |  | 808
Total Fair Value |  | 2,891,898
Total Gross Unrealized Losses |  | 10,606
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value |  | 9,973
Less than 12 months Gross Unrealized Losses |  | 4
12 months or more Fair Value |  | 99,846
12 months or more Gross Unrealized Losses |  | 107
Total Fair Value |  | 109,819
Total Gross Unrealized Losses |  | 111
Collateralized Mortgage Obligations - Federal agencies |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 4,029 | 114,603
Less than 12 months Gross Unrealized Losses | 43 | 537
12 months or more Fair Value | 0 | 310,315
12 months or more Gross Unrealized Losses | 0 | 7,016
Total Fair Value | 4,029 | 424,918
Total Gross Unrealized Losses | 43 | 7,553
Mortgage Backed Securities |  |
Debt Securities, Available-for-sale |  |
Less than 12 months Fair Value | 886,432 | 179,312
Less than 12 months Gross Unrealized Losses | 1,834 | 693
12 months or more Fair Value | 555 | 1,784,414
12 months or more Gross Unrealized Losses | 11 | 20,854
Total Fair Value | 886,987 | 1,963,726
Total Gross Unrealized Losses | $ 1,845 | $ 21,547

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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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- 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 less 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 + 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 unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118955579&loc=SL82922888-210455 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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