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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Less than 12 months    
Gross Unrealized Losses $ (77,395) $ (18,989)
Estimated Fair Value 1,978,196 1,593,655
12 months or more    
Gross Unrealized Losses (21,332) (1,540)
Estimated Fair Value 276,587 36,587
Total    
Gross Unrealized Losses (98,727) (20,529)
Estimated Fair Value 2,254,783 1,630,242
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (12,056) (5,534)
Estimated Fair Value 188,447 261,404
12 months or more    
Gross Unrealized Losses (17,585) (1,540)
Estimated Fair Value 176,659 36,587
Total    
Gross Unrealized Losses (29,641) (7,074)
Estimated Fair Value 365,106 297,991
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses (77) 0
Estimated Fair Value 4,849 0
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (77) 0
Estimated Fair Value 4,849 0
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (61,996) (11,892)
Estimated Fair Value 1,647,055 1,199,367
12 months or more    
Gross Unrealized Losses (1,834) 0
Estimated Fair Value 63,176 0
Total    
Gross Unrealized Losses (63,830) (11,892)
Estimated Fair Value 1,710,231 1,199,367
Other securities    
Less than 12 months    
Gross Unrealized Losses (3,266) (1,563)
Estimated Fair Value 137,845 132,884
12 months or more    
Gross Unrealized Losses (1,913) 0
Estimated Fair Value 36,752 0
Total    
Gross Unrealized Losses (5,179) (1,563)
Estimated Fair Value $ 174,597 $ 132,884