v3.26.1
Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Less than 12 months    
Gross Unrealized Losses $ (3,053) $ (195)
Estimated Fair Value 299,157 22,809
12 months or more    
Gross Unrealized Losses (65,878) (71,532)
Estimated Fair Value 804,960 1,036,556
Total    
Gross Unrealized Losses (68,931) (71,727)
Estimated Fair Value 1,104,117 1,059,365
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (1,908) (164)
Estimated Fair Value 146,688 10,896
12 months or more    
Gross Unrealized Losses (54,885) (54,207)
Estimated Fair Value 260,353 275,703
Total    
Gross Unrealized Losses (56,793) (54,371)
Estimated Fair Value 407,041 286,599
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 (229) (334)
Estimated Fair Value 2,017 2,156
Total    
Gross Unrealized Losses (229) (334)
Estimated Fair Value 2,017 2,156
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
12 months or more    
Gross Unrealized Losses (3,115) (9,581)
Estimated Fair Value 446,416 639,506
Total    
Gross Unrealized Losses (3,115) (9,581)
Estimated Fair Value 446,416 639,506
Other securities    
Less than 12 months    
Gross Unrealized Losses (1,145) (31)
Estimated Fair Value 152,469 11,913
12 months or more    
Gross Unrealized Losses (7,649) (7,410)
Estimated Fair Value 96,174 119,191
Total    
Gross Unrealized Losses (8,794) (7,441)
Estimated Fair Value $ 248,643 $ 131,104