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MARKETABLE SECURITIES - Securities in Continuous Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Gross Unrealized Losses    
Less Than 12 Months $ (5,036) $ (74)
12 Months or Longer 727 81
Total (5,763) (155)
Estimated Fair Value    
Less Than 12 Months 342,644 10,688
12 Months or Longer 2,347 2,996
Total 344,991 13,684
Gross Unrealized Losses    
Less Than 12 Months (17,778) (2,414)
12 Months or Longer (2,443) (396)
Total (20,221) (2,810)
Estimated Fair Value    
Less Than 12 Months 256,694 205,928
12 Months or Longer 22,846 11,317
Total 279,540 217,245
U.S. government agencies    
Gross Unrealized Losses    
Less Than 12 Months (731) (42)
12 Months or Longer 0
Total (731) (42)
Estimated Fair Value    
Less Than 12 Months 9,281 9,971
12 Months or Longer 0
Total 9,281 9,971
Corporate bonds    
Gross Unrealized Losses    
Less Than 12 Months (645) (85)
12 Months or Longer 0
Total (645) (85)
Estimated Fair Value    
Less Than 12 Months 23,336 11,418
12 Months or Longer 0
Total 23,336 11,418
Mortgage-backed securities    
Gross Unrealized Losses    
Less Than 12 Months (1,534) (37)
12 Months or Longer 0 0
Total (1,534) (37)
Estimated Fair Value    
Less Than 12 Months 30,753 2,916
12 Months or Longer 0 0
Total 30,753 2,916
Gross Unrealized Losses    
Less Than 12 Months (12,285) (1,383)
12 Months or Longer (2,443) (396)
Total (14,728) (1,779)
Estimated Fair Value    
Less Than 12 Months 168,057 144,367
12 Months or Longer 22,846 11,317
Total 190,903 155,684
Collateralized mortgage obligations    
Gross Unrealized Losses    
Less Than 12 Months (4,117) (904)
12 Months or Longer 0 0
Total (4,117) (904)
Estimated Fair Value    
Less Than 12 Months 56,020 40,172
12 Months or Longer 0 0
Total 56,020 40,172
Municipal securities    
Gross Unrealized Losses    
Less Than 12 Months (2,333) (37)
12 Months or Longer 727 81
Total (3,060) (118)
Estimated Fair Value    
Less Than 12 Months 41,962 7,772
12 Months or Longer 2,347 2,996
Total 44,309 $ 10,768
US Treasury Securities [Member]    
Gross Unrealized Losses    
Less Than 12 Months (1,169)  
12 Months or Longer 0  
Total (1,169)  
Estimated Fair Value    
Less Than 12 Months 269,929  
12 Months or Longer 0  
Total $ 269,929