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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Less than 12 months    
Gross Unrealized Losses $ (2,797) $ (2,752)
Estimated Fair Value 149,164 142,116
12 months or more    
Gross Unrealized Losses (115,288) (150,916)
Estimated Fair Value 1,390,575 2,123,439
Total    
Gross Unrealized Losses (118,085) (153,668)
Estimated Fair Value 1,539,739 2,265,555
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (2,723) (531)
Estimated Fair Value 137,585 51,391
12 months or more    
Gross Unrealized Losses (70,512) (61,949)
Estimated Fair Value 290,257 300,318
Total    
Gross Unrealized Losses (73,235) (62,480)
Estimated Fair Value 427,842 351,709
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 (490) (279)
Estimated Fair Value 2,359 3,129
Total    
Gross Unrealized Losses (490) (279)
Estimated Fair Value 2,359 3,129
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 (32,265) (66,870)
Estimated Fair Value 915,744 1,578,739
Total    
Gross Unrealized Losses (32,265) (66,870)
Estimated Fair Value 915,744 1,578,739
Other securities    
Less than 12 months    
Gross Unrealized Losses (74) (2,221)
Estimated Fair Value 11,579 90,725
12 months or more    
Gross Unrealized Losses (12,021) (21,818)
Estimated Fair Value 182,215 241,253
Total    
Gross Unrealized Losses (12,095) (24,039)
Estimated Fair Value $ 193,794 $ 331,978