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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Less than 12 months    
Gross Unrealized Losses $ (206) $ (228)
Estimated Fair Value 41,837 16,948
12 months or more    
Gross Unrealized Losses (858) (6,030)
Estimated Fair Value 84,256 142,184
Total    
Gross Unrealized Losses (1,064) (6,258)
Estimated Fair Value 126,093 159,132
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (126) (228)
Estimated Fair Value 6,920 16,948
12 months or more    
Gross Unrealized Losses (597) (5,289)
Estimated Fair Value 73,337 125,537
Total    
Gross Unrealized Losses (723) (5,517)
Estimated Fair Value 80,257 142,485
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 (261) (741)
Estimated Fair Value 10,919 16,647
Total    
Gross Unrealized Losses (261) (741)
Estimated Fair Value 10,919 $ 16,647
U.S. government-sponsored enterprises    
Less than 12 months    
Gross Unrealized Losses (80)  
Estimated Fair Value 34,917  
12 months or more    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
Total    
Gross Unrealized Losses (80)  
Estimated Fair Value $ 34,917