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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Less than 12 months    
Gross Unrealized Losses $ (907) $ (2,797)
Estimated Fair Value 108,396 149,164
12 months or more    
Gross Unrealized Losses (99,035) (115,288)
Estimated Fair Value 1,075,581 1,390,575
Total    
Gross Unrealized Losses (99,942) (118,085)
Estimated Fair Value 1,183,977 1,539,739
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (846) (2,723)
Estimated Fair Value 96,803 137,585
12 months or more    
Gross Unrealized Losses (63,774) (70,512)
Estimated Fair Value 308,278 290,257
Total    
Gross Unrealized Losses (64,620) (73,235)
Estimated Fair Value 405,081 427,842
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 (409) (490)
Estimated Fair Value 2,250 2,359
Total    
Gross Unrealized Losses (409) (490)
Estimated Fair Value 2,250 2,359
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 (24,058) (32,265)
Estimated Fair Value 624,355 915,744
Total    
Gross Unrealized Losses (24,058) (32,265)
Estimated Fair Value 624,355 915,744
Other securities    
Less than 12 months    
Gross Unrealized Losses (61) (74)
Estimated Fair Value 11,593 11,579
12 months or more    
Gross Unrealized Losses (10,794) (12,021)
Estimated Fair Value 140,698 182,215
Total    
Gross Unrealized Losses (10,855) (12,095)
Estimated Fair Value $ 152,291 $ 193,794