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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Less than 12 months    
Gross Unrealized Losses $ (6) $ (228)
Estimated Fair Value 10,815 16,948
12 months or more    
Gross Unrealized Losses (1,509) (6,030)
Estimated Fair Value 113,924 142,184
Gross Unrealized Losses (1,515) (6,258)
Estimated Fair Value 124,739 159,132
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (6) (228)
Estimated Fair Value 10,815 16,948
12 months or more    
Gross Unrealized Losses (1,439) (5,289)
Estimated Fair Value 101,969 125,537
Gross Unrealized Losses (1,445) (5,517)
Estimated Fair Value 112,784 142,485
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 (70) (741)
Estimated Fair Value 11,955 16,647
Gross Unrealized Losses (70) (741)
Estimated Fair Value 11,955 $ 16,647
U.S. government-sponsored enterprises    
Less than 12 months    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
12 months or more    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
Gross Unrealized Losses 0  
Estimated Fair Value $ 0