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Investment Securities - Continuous Unrealized Loss (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair value |  |
Less than 12 months | $ 2,219 | $ 0
12 months or more | 2,176,748 | 2,234,762
Total fair value | 2,178,967 | 2,234,762
Unrealized loss |  |
Less than 12 months | (1) | 0
12 months or more | (392,985) | (380,265)
Total unrealized loss | (392,986) | (380,265)
Corporate bonds |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 9,667 | 9,626
Total fair value | 9,667 | 9,626
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (333) | (374)
Total unrealized loss | (333) | (374)
Agency bond securities |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 198,527 | 200,230
Total fair value | 198,527 | 200,230
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (41,965) | (40,217)
Total unrealized loss | (41,965) | (40,217)
Agency mortgage-backed securities |  |
Fair value |  |
Less than 12 months | 2,219 | 0
12 months or more | 1,945,250 | 2,001,270
Total fair value | 1,947,469 | 2,001,270
Unrealized loss |  |
Less than 12 months | (1) | 0
12 months or more | (344,682) | (333,901)
Total unrealized loss | (344,683) | (333,901)
Municipal bonds |  |
Fair value |  |
Less than 12 months | 0 | 0
12 months or more | 23,304 | 23,636
Total fair value | 23,304 | 23,636
Unrealized loss |  |
Less than 12 months | 0 | 0
12 months or more | (6,005) | (5,773)
Total unrealized loss | $ (6,005) | $ (5,773)

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