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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Less than 12 months    
Gross Unrealized Losses $ (2,752) $ (58,293)
Estimated Fair Value 142,116 1,024,671
12 months or more    
Gross Unrealized Losses (150,916) (153,985)
Estimated Fair Value 2,123,439 1,313,469
Total    
Gross Unrealized Losses (153,668) (212,278)
Estimated Fair Value 2,265,555 2,338,140
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (531) (13,956)
Estimated Fair Value 51,391 99,598
12 months or more    
Gross Unrealized Losses (61,949) (54,749)
Estimated Fair Value 300,318 220,576
Total    
Gross Unrealized Losses (62,480) (68,705)
Estimated Fair Value 351,709 320,174
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses 0 (357)
Estimated Fair Value 0 3,227
12 months or more    
Gross Unrealized Losses (279) 0
Estimated Fair Value 3,129 0
Total    
Gross Unrealized Losses (279) (357)
Estimated Fair Value 3,129 3,227
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses 0 (28,128)
Estimated Fair Value 0 689,300
12 months or more    
Gross Unrealized Losses (66,870) (87,288)
Estimated Fair Value 1,578,739 1,000,010
Total    
Gross Unrealized Losses (66,870) (115,416)
Estimated Fair Value 1,578,739 1,689,310
Other securities    
Less than 12 months    
Gross Unrealized Losses (2,221) (15,852)
Estimated Fair Value 90,725 232,546
12 months or more    
Gross Unrealized Losses (21,818) (11,948)
Estimated Fair Value 241,253 92,883
Total    
Gross Unrealized Losses (24,039) (27,800)
Estimated Fair Value $ 331,978 $ 325,429