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Debt Securities Available for Sale - AFS debt securities in a continuous unrealized loss position (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | $ 409,520 | $ 7,907,905
Less than 12 months Gross Unrealized Losses | 10,331 | 437,310
12 months or more Fair Value | 12,835,038 | 7,929,428
12 months or more Gross Unrealized Losses | 1,853,813 | 1,322,381
Total Fair Value | 13,244,558 | 15,837,333
Total Gross Unrealized Losses | 1,864,144 | 1,759,691
US Treasury Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 350,471 | 6,027,786
Less than 12 months Gross Unrealized Losses | 8,546 | 288,582
12 months or more Fair Value | 7,111,545 | 3,244,572
12 months or more Gross Unrealized Losses | 375,928 | 209,696
Total Fair Value | 7,462,016 | 9,272,358
Total Gross Unrealized Losses | 384,474 | 498,278
Collateralized Mortgage Obligations - Federal agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 8,212 | 139,845
Less than 12 months Gross Unrealized Losses | 214 | 10,655
12 months or more Fair Value | 127,961 | 22,661
12 months or more Gross Unrealized Losses | 16,028 | 3,705
Total Fair Value | 136,173 | 162,506
Total Gross Unrealized Losses | 16,242 | 14,360
Mortgage Backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 50,837 | 1,740,214
Less than 12 months Gross Unrealized Losses | 1,571 | 138,071
12 months or more Fair Value | 5,595,532 | 4,662,195
12 months or more Gross Unrealized Losses | 1,461,857 | 1,108,980
Total Fair Value | 5,646,369 | 6,402,409
Total Gross Unrealized Losses | $ 1,463,428 | 1,247,051
Other |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value |  | 60
Less than 12 months Gross Unrealized Losses |  | 2
12 months or more Fair Value |  | 0
12 months or more Gross Unrealized Losses |  | 0
Total Fair Value |  | 60
Total Gross Unrealized Losses |  | $ 2

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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 https://asc.fasb.org/extlink&oid=124269663&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=121590138&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
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