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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Less than 12 months    
Gross Unrealized Losses $ (224) $ (2,752)
Estimated Fair Value 57,534 142,116
12 months or more    
Gross Unrealized Losses (99,116) (150,916)
Estimated Fair Value 1,485,532 2,123,439
Total    
Gross Unrealized Losses (99,340) (153,668)
Estimated Fair Value 1,543,066 2,265,555
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (101) (531)
Estimated Fair Value 34,601 51,391
12 months or more    
Gross Unrealized Losses (54,774) (61,949)
Estimated Fair Value 309,842 300,318
Total    
Gross Unrealized Losses (54,875) (62,480)
Estimated Fair Value 344,443 351,709
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
12 months or more    
Gross Unrealized Losses (318) (279)
Estimated Fair Value 2,531 3,129
Total    
Gross Unrealized Losses (318) (279)
Estimated Fair Value 2,531 3,129
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
12 months or more    
Gross Unrealized Losses (31,323) (66,870)
Estimated Fair Value 966,207 1,578,739
Total    
Gross Unrealized Losses (31,323) (66,870)
Estimated Fair Value 966,207 1,578,739
Other securities    
Less than 12 months    
Gross Unrealized Losses (123) (2,221)
Estimated Fair Value 22,933 90,725
12 months or more    
Gross Unrealized Losses (12,701) (21,818)
Estimated Fair Value 206,952 241,253
Total    
Gross Unrealized Losses (12,824) (24,039)
Estimated Fair Value $ 229,885 $ 331,978