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Investment Securities - Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair value |  |
Less than 12 months | $ 613,181 | $ 917,373
12 months or more | 1,753,581 | 1,443,708
Total fair value | 2,366,762 | 2,361,081
Unrealized loss |  |
Less than 12 months | (26,246) | (71,396)
12 months or more | (359,701) | (356,768)
Total unrealized loss | (385,947) | (428,164)
Corporate bonds |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 9,343 | 9,346
Total fair value | 9,343 | 9,346
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (657) | (654)
Total unrealized loss | (657) | (654)
Agency bond securities |  |
Fair value |  |
Less than 12 months | 9,129 | 8,972
12 months or more | 187,559 | 184,133
Total fair value | 196,688 | 193,105
Unrealized loss |  |
Less than 12 months | (343) | (457)
12 months or more | (43,283) | (46,709)
Total unrealized loss | (43,626) | (47,166)
Agency mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 599,305 | 892,068
12 months or more | 1,537,565 | 1,243,588
Total fair value | 2,136,870 | 2,135,656
Unrealized loss |  |
Less than 12 months | (25,615) | (67,569)
12 months or more | (310,358) | (306,135)
Total unrealized loss | (335,973) | (373,704)
Municipal bonds |  |
Fair value |  |
Less than 12 months | 4,747 | 16,333
12 months or more | 19,114 | 6,641
Total fair value | 23,861 | 22,974
Unrealized loss |  |
Less than 12 months | (288) | (3,370)
12 months or more | (5,403) | (3,270)
Total unrealized loss | $ (5,691) | $ (6,640)

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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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