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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Less than 12 months    
Gross Unrealized Losses $ (7,045) $ (485)
Estimated Fair Value 451,216 76,452
12 months or more    
Gross Unrealized Losses (271) 0
Estimated Fair Value 12,776 0
Total    
Gross Unrealized Losses (7,316) (485)
Estimated Fair Value 463,992 76,452
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (6,545) (134)
Estimated Fair Value 242,386 46,011
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (6,545) (134)
Estimated Fair Value 242,386 46,011
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses (15) 0
Estimated Fair Value 4,357 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (15) 0
Estimated Fair Value 4,357 0
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (146) 0
Estimated Fair Value 114,870 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (146) 0
Estimated Fair Value 114,870 0
Other securities    
Less than 12 months    
Gross Unrealized Losses (339) (351)
Estimated Fair Value 89,603 30,441
12 months or more    
Gross Unrealized Losses (271) 0
Estimated Fair Value 12,776 0
Total    
Gross Unrealized Losses (610) (351)
Estimated Fair Value $ 102,379 $ 30,441