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Schedule of Temporary Impairment Losses, Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 616,229 $ 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (13,689) (10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 616,229 3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss (13,689) (10)
US Government Agencies Debt Securities Commercial    
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 91,266  
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,098)  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 91,266  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss (1,098)  
Residential Mortgage Backed Securities [Member]    
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 481,498 3,755
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (10,788) (10)
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0 0
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0 0
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 481,498 3,755
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss (10,788) $ (10)
US Government-sponsored Enterprises Debt Securities [Member]    
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 21,421  
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (1,250)  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 21,421  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss (1,250)  
Obligations of States and Political Subdivisions [Member]    
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 16,919  
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (478)  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 16,919  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss (478)  
Corporate Debt Securities [Member]    
Schedule of Unrealized Losses and Estimated Fair Values [Line Items]    
Investment Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 5,125  
Investment Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss (75)  
Investment Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0  
Investment Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0  
Investment Securities, Continuous Unrealized Loss Position, Fair Value, Total 5,125  
Investment Securities, Continuous Unrealized Loss Position, Accumulated Loss $ (75)