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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Less than 12 months    
Gross Unrealized Losses $ (9,419) $ (58,293)
Estimated Fair Value 334,073 1,024,671
12 months or more    
Gross Unrealized Losses (181,681) (153,985)
Estimated Fair Value 1,984,434 1,313,469
Total    
Gross Unrealized Losses (191,100) (212,278)
Estimated Fair Value 2,318,507 2,338,140
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (879) (13,956)
Estimated Fair Value 44,532 99,598
12 months or more    
Gross Unrealized Losses (65,461) (54,749)
Estimated Fair Value 308,309 220,576
Total    
Gross Unrealized Losses (66,340) (68,705)
Estimated Fair Value 352,841 320,174
Utah Housing Corporation bonds    
Less than 12 months    
Gross Unrealized Losses 0 (357)
Estimated Fair Value 0 3,227
12 months or more    
Gross Unrealized Losses (405) 0
Estimated Fair Value 3,055 0
Total    
Gross Unrealized Losses (405) (357)
Estimated Fair Value 3,055 3,227
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (4,419) (28,128)
Estimated Fair Value 93,990 689,300
12 months or more    
Gross Unrealized Losses (98,663) (87,288)
Estimated Fair Value 1,511,818 1,000,010
Total    
Gross Unrealized Losses (103,082) (115,416)
Estimated Fair Value 1,605,808 1,689,310
Other securities    
Less than 12 months    
Gross Unrealized Losses (4,121) (15,852)
Estimated Fair Value 195,551 232,546
12 months or more    
Gross Unrealized Losses (17,152) (11,948)
Estimated Fair Value 161,252 92,883
Total    
Gross Unrealized Losses (21,273) (27,800)
Estimated Fair Value $ 356,803 $ 325,429