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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Less than 12 months    
Gross Unrealized Losses $ (18,989) $ (485)
Estimated Fair Value 1,593,655 76,452
12 months or more    
Gross Unrealized Losses (1,540) 0
Estimated Fair Value 36,587 0
Total    
Gross Unrealized Losses (20,529) (485)
Estimated Fair Value 1,630,242 76,452
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (5,534) (134)
Estimated Fair Value 261,404 46,011
12 months or more    
Gross Unrealized Losses (1,540) 0
Estimated Fair Value 36,587 0
Total    
Gross Unrealized Losses (7,074) (134)
Estimated Fair Value 297,991 46,011
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 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (11,892) 0
Estimated Fair Value 1,199,367 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (11,892) 0
Estimated Fair Value 1,199,367 0
Other securities    
Less than 12 months    
Gross Unrealized Losses (1,563) (351)
Estimated Fair Value 132,884 30,441
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (1,563) (351)
Estimated Fair Value $ 132,884 $ 30,441