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INVESTMENT SECURITIES - Securities with unrealized losses (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair Value $ 17,937 $ 4,369
Less than 12 months, Unrealized Losses (164) (51)
12 months or Longer, Fair Value 521 566
12 months or Longer, Unrealized Losses (18) (13)
Total Fair Value 18,458 4,935
Total Unrealized Losses (182) (64)
Sales 0 0
U.S. Treasury debt    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair Value 247  
Less than 12 months, Unrealized Losses (3)  
Total Fair Value 247  
Total Unrealized Losses (3)  
Government National Mortgage Association ("GNMA") mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair Value 17,205  
Less than 12 months, Unrealized Losses (146)  
Total Fair Value 17,205  
Total Unrealized Losses (146)  
Corporate bonds    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair Value 485 3,489
Less than 12 months, Unrealized Losses (15) (11)
Total Fair Value 485 3,489
Total Unrealized Losses (15) (11)
Corporate collateralized mortgage obligations ("CMO") and MBS    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Fair Value   880
Less than 12 months, Unrealized Losses   (40)
12 months or Longer, Fair Value 521 566
12 months or Longer, Unrealized Losses (18) (13)
Total Fair Value 521 1,446
Total Unrealized Losses $ (18) $ (53)