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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Less than 12 months    
Gross Unrealized Losses $ (2,876) $ (2,752)
Estimated Fair Value 162,036 142,116
12 months or more    
Gross Unrealized Losses (151,937) (150,916)
Estimated Fair Value 1,723,608 2,123,439
Total    
Gross Unrealized Losses (154,813) (153,668)
Estimated Fair Value 1,885,644 2,265,555
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (1,650) (531)
Estimated Fair Value 98,678 51,391
12 months or more    
Gross Unrealized Losses (69,521) (61,949)
Estimated Fair Value 286,434 300,318
Total    
Gross Unrealized Losses (71,171) (62,480)
Estimated Fair Value 385,112 351,709
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 (292) (279)
Estimated Fair Value 2,909 3,129
Total    
Gross Unrealized Losses (292) (279)
Estimated Fair Value 2,909 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 (63,613) (66,870)
Estimated Fair Value 1,232,727 1,578,739
Total    
Gross Unrealized Losses (63,613) (66,870)
Estimated Fair Value 1,232,727 1,578,739
Other securities    
Less than 12 months    
Gross Unrealized Losses (1,226) (2,221)
Estimated Fair Value 63,358 90,725
12 months or more    
Gross Unrealized Losses (18,511) (21,818)
Estimated Fair Value 201,538 241,253
Total    
Gross Unrealized Losses (19,737) (24,039)
Estimated Fair Value $ 264,896 $ 331,978