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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)