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DEPOSITS - Interest Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Interest Expense Domestic Deposit Liabilities [Abstract]      
Interest Expense Domestic Deposit Liabilities, Notice of Withdrawal, Net of Withdrawal Penalties $ 417 $ 252 $ 167
Interest Expense Domestic Deposit Liabilities, Money Market, Net of Withdrawal Penalties 2,721 2,912 1,895
Interest Expense Domestic Deposit Liabilities, Time Deposit, Net of Withdrawal Penalties 3,816 5,001 2,400
Interest Expense Domestic Deposit Liabilities, Total $ 6,954 $ 8,165 $ 4,462