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Investments, Securities with Continuous Unrealized Loss Position (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Securities
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Securities
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Securities
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]          
Less than 12 months $ 20,285   $ 20,285   $ 11,647
12 months or longer 0   0   0
Total 20,285   20,285   11,647
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]          
Less than 12 months 433   433   94
12 months or longer 0   0   0
Total 433   433   $ 94
Gross OTTI losses charged to realized gains $ 0 $ 0 $ 0 $ 0  
Number of securities in unrealized loss position | Securities 26   26   20
U.S. Treasury Securities and Obligations of U.S. Government Agencies and Authorities [Member]          
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]          
Less than 12 months $ 12,341   $ 12,341   $ 7,045
12 months or longer 0   0   0
Total 12,341   12,341   7,045
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]          
Less than 12 months 156   156   26
12 months or longer 0   0   0
Total 156   156   26
Corporate Securities [Member]          
Available-for-sale securities, continuous unrealized loss position, Fair Value [Abstract]          
Less than 12 months 7,944   7,944   4,602
12 months or longer 0   0   0
Total 7,944   7,944   4,602
Available-for-sale Securities, Continuous Unrealized Loss Position, Unrealized Losses [Abstract]          
Less than 12 months 277   277   68
12 months or longer 0   0   0
Total $ 277   $ 277   $ 68