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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Less than 12 months    
Gross Unrealized Losses $ (2,202) $ (239)
Estimated Fair Value 372,365 40,601
12 months or more    
Gross Unrealized Losses 0 (523)
Estimated Fair Value 0 53,545
Total    
Gross Unrealized Losses (2,202) (762)
Estimated Fair Value 372,365 94,146
Mortgage-backed securities    
Less than 12 months    
Gross Unrealized Losses (378) (218)
Estimated Fair Value 123,612 25,624
12 months or more    
Gross Unrealized Losses 0 (440)
Estimated Fair Value 0 42,448
Total    
Gross Unrealized Losses (378) (658)
Estimated Fair Value 123,612 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 0 (83)
Estimated Fair Value 0 11,097
Total    
Gross Unrealized Losses 0 (83)
Estimated Fair Value 0 11,097
U.S. government-sponsored enterprises and Treasuries    
Less than 12 months    
Gross Unrealized Losses (6) (21)
Estimated Fair Value 174,867 14,977
12 months or more    
Gross Unrealized Losses 0 0
Estimated Fair Value 0 0
Total    
Gross Unrealized Losses (6) (21)
Estimated Fair Value 174,867 $ 14,977
Other securities    
Less than 12 months    
Gross Unrealized Losses (1,818)  
Estimated Fair Value 73,886  
12 months or more    
Gross Unrealized Losses 0  
Estimated Fair Value 0  
Total    
Gross Unrealized Losses (1,818)  
Estimated Fair Value $ 73,886