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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)