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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Less than 12 months    
Gross Unrealized Losses $ (6,761) $ (485)
Estimated Fair Value 737,720 76,452
12 months or more    
Gross Unrealized Losses (125) 0
Estimated Fair Value 5,869 0
Total    
Gross Unrealized Losses (6,886) (485)
Estimated Fair Value 743,589 76,452
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (5,283) (134)
Estimated Fair Value 277,142 46,011
12 months or more    
Gross Unrealized Losses (125) 0
Estimated Fair Value 5,869 0
Total    
Gross Unrealized Losses (5,408) (134)
Estimated Fair Value 283,011 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 (1,125) 0
Estimated Fair Value 413,177 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (1,125) 0
Estimated Fair Value 413,177 0
Other securities    
Less than 12 months    
Gross Unrealized Losses (353) (351)
Estimated Fair Value 47,401 30,441
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (353) (351)
Estimated Fair Value $ 47,401 $ 30,441