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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Less than 12 months    
Gross Unrealized Losses $ (2,897) $ (2,752)
Estimated Fair Value 183,669 142,116
12 months or more    
Gross Unrealized Losses (145,806) (150,916)
Estimated Fair Value 1,802,403 2,123,439
Total    
Gross Unrealized Losses (148,703) (153,668)
Estimated Fair Value 1,986,072 2,265,555
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (1,739) (531)
Estimated Fair Value 106,041 51,391
12 months or more    
Gross Unrealized Losses (72,217) (61,949)
Estimated Fair Value 313,289 300,318
Total    
Gross Unrealized Losses (73,956) (62,480)
Estimated Fair Value 419,330 351,709
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 (320) (279)
Estimated Fair Value 2,881 3,129
Total    
Gross Unrealized Losses (320) (279)
Estimated Fair Value 2,881 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 (55,211) (66,870)
Estimated Fair Value 1,241,731 1,578,739
Total    
Gross Unrealized Losses (55,211) (66,870)
Estimated Fair Value 1,241,731 1,578,739
Other securities    
Less than 12 months    
Gross Unrealized Losses (1,158) (2,221)
Estimated Fair Value 77,628 90,725
12 months or more    
Gross Unrealized Losses (18,058) (21,818)
Estimated Fair Value 244,502 241,253
Total    
Gross Unrealized Losses (19,216) (24,039)
Estimated Fair Value $ 322,130 $ 331,978