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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Less than 12 months    
Gross Unrealized Losses $ (239) $ (228)
Estimated Fair Value 40,601 16,948
12 months or more    
Gross Unrealized Losses (523) (6,030)
Estimated Fair Value 53,545 142,184
Gross Unrealized Losses (762) (6,258)
Estimated Fair Value 94,146 159,132
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (218) (228)
Estimated Fair Value 25,624 16,948
12 months or more    
Gross Unrealized Losses (440) (5,289)
Estimated Fair Value 42,448 125,537
Gross Unrealized Losses (658) (5,517)
Estimated Fair Value 68,072 142,485
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 (83) (741)
Estimated Fair Value 11,097 16,647
Gross Unrealized Losses (83) (741)
Estimated Fair Value 11,097 $ 16,647
U.S. government-sponsored enterprises    
Less than 12 months    
Gross Unrealized Losses (21)  
Estimated Fair Value 14,977  
12 months or more    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
Gross Unrealized Losses (21)  
Estimated Fair Value $ 14,977