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Investment Securities - Continuous Unrealized Loss (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair value    
Less than 12 months $ 364,618 $ 917,373
12 months or more 1,917,246 1,443,708
Total fair value 2,281,864 2,361,081
Unrealized loss    
Less than 12 months (17,935) (71,396)
12 months or more (408,349) (356,768)
Total unrealized loss (426,284) (428,164)
Corporate bonds    
Fair value    
Less than 12 months 0 0
12 months or more 9,358 9,346
Total fair value 9,358 9,346
Unrealized loss    
Less than 12 months 0 0
12 months or more (642) (654)
Total unrealized loss (642) (654)
Agency bond securities    
Fair value    
Less than 12 months 0 8,972
12 months or more 195,121 184,133
Total fair value 195,121 193,105
Unrealized loss    
Less than 12 months 0 (457)
12 months or more (45,237) (46,709)
Total unrealized loss (45,237) (47,166)
Agency mortgage-backed securities    
Fair value    
Less than 12 months 360,104 892,068
12 months or more 1,693,793 1,243,588
Total fair value 2,053,897 2,135,656
Unrealized loss    
Less than 12 months (17,449) (67,569)
12 months or more (356,897) (306,135)
Total unrealized loss (374,346) (373,704)
Municipal bonds    
Fair value    
Less than 12 months 4,514 16,333
12 months or more 18,974 6,641
Total fair value 23,488 22,974
Unrealized loss    
Less than 12 months (486) (3,370)
12 months or more (5,573) (3,270)
Total unrealized loss $ (6,059) $ (6,640)