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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Less than 12 months    
Gross Unrealized Losses $ (4,351) $ (485)
Estimated Fair Value 644,474 76,452
12 months or more    
Gross Unrealized Losses (1) 0
Estimated Fair Value 2,557 0
Total    
Gross Unrealized Losses (4,352) (485)
Estimated Fair Value 647,031 76,452
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (3,762) (134)
Estimated Fair Value 251,811 46,011
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (3,762) (134)
Estimated Fair Value 251,811 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 (264) 0
Estimated Fair Value 316,890 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (264) 0
Estimated Fair Value 316,890 0
Other securities    
Less than 12 months    
Gross Unrealized Losses (325) (351)
Estimated Fair Value 75,773 30,441
12 months or more    
Gross Unrealized Losses (1) 0
Estimated Fair Value 2,557 0
Total    
Gross Unrealized Losses (326) (351)
Estimated Fair Value $ 78,330 $ 30,441