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INVESTMENT SECURITIES - Equity and Other Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Equity and Other Securities [Abstract]    
Amortized cost $ 44,069 $ 46,511
Gross unrealized gains 958 944
Gross unrealized losses 0 0
Equity and other securities (cost of $44,069 and $46,511, respectively) 45,027 47,455
Equity Securities, at Fair Value [Abstract]    
Amortized cost 251 251
Gross unrealized gains 208 194
Gross unrealized losses 0 0
Fair value 459 445
Federal Home Loan Bank Common Stock [Member]    
Other Equity Securities, at Adjusted Cost [Abstract]    
Amortized cost 7,251 7,468
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 7,251 7,468
Federal Reserve Bank Stock [Member]    
Other Equity Securities, at Adjusted Cost [Abstract]    
Amortized cost 33,916 33,916
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Fair value 33,916 33,916
Other Equity Securities [Member]    
Other Equity Securities, at Adjusted Cost [Abstract]    
Amortized cost 2,651 4,876
Gross unrealized gains 750 750
Gross unrealized losses 0 0
Fair value $ 3,401 $ 5,626