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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Less than 12 months    
Gross Unrealized Losses $ (121,118) $ (18,989)
Estimated Fair Value 1,824,318 1,593,655
12 months or more    
Gross Unrealized Losses (94,883) (1,540)
Estimated Fair Value 603,149 36,587
Total    
Gross Unrealized Losses (216,001) (20,529)
Estimated Fair Value 2,427,467 1,630,242
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (21,060) (5,534)
Estimated Fair Value 126,053 261,404
12 months or more    
Gross Unrealized Losses (50,622) (1,540)
Estimated Fair Value 196,946 36,587
Total    
Gross Unrealized Losses (71,682) (7,074)
Estimated Fair Value 322,999 297,991
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses (279) 0
Estimated Fair Value 3,305 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (279) 0
Estimated Fair Value 3,305 0
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (84,320) (11,892)
Estimated Fair Value 1,430,124 1,199,367
12 months or more    
Gross Unrealized Losses (39,919) 0
Estimated Fair Value 374,523 0
Total    
Gross Unrealized Losses (124,239) (11,892)
Estimated Fair Value 1,804,647 1,199,367
Other securities    
Less than 12 months    
Gross Unrealized Losses (15,459) (1,563)
Estimated Fair Value 264,836 132,884
12 months or more    
Gross Unrealized Losses (4,342) 0
Estimated Fair Value 31,680 0
Total    
Gross Unrealized Losses (19,801) (1,563)
Estimated Fair Value $ 296,516 $ 132,884