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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Less than 12 months    
Gross Unrealized Losses $ (2,973) $ (239)
Estimated Fair Value 92,663 40,601
12 months or more    
Gross Unrealized Losses (74) (523)
Estimated Fair Value 8,965 53,545
Total    
Gross Unrealized Losses (3,047) (762)
Estimated Fair Value 101,628 94,146
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses 0 (218)
Estimated Fair Value 0 25,624
12 months or more    
Gross Unrealized Losses 0 (440)
Estimated Fair Value 0 42,448
Total    
Gross Unrealized Losses 0 (658)
Estimated Fair Value 0 68,072
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 (74) (83)
Estimated Fair Value 8,965 11,097
Total    
Gross Unrealized Losses (74) (83)
Estimated Fair Value 8,965 11,097
U.S. government-sponsored enterprises    
Less than 12 months    
Gross Unrealized Losses (8) (21)
Estimated Fair Value 16,823 14,977
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (8) (21)
Estimated Fair Value 16,823 $ 14,977
Other securities    
Less than 12 months    
Gross Unrealized Losses (2,965)  
Estimated Fair Value 75,840  
12 months or more    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
Total    
Gross Unrealized Losses (2,965)  
Estimated Fair Value $ 75,840