PLEDGED ASSETS - Assets Pledged By Counterparties (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Pledged Assets [Line Items]
Securities Pledged By Counterparties	$ 18,763	$ 6,456
Cash
Pledged Assets [Line Items]
Securities Pledged By Counterparties	18,763	6,203
US Treasury Securities [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	0	253
Repurchase Agreement [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	4,998	373
Repurchase Agreement [Member] | Cash
Pledged Assets [Line Items]
Securities Pledged By Counterparties	4,998	120
Repurchase Agreement [Member] | US Treasury Securities [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	0	253
Derivative Agreements [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	13,765	6,083
Derivative Agreements [Member] | Cash
Pledged Assets [Line Items]
Securities Pledged By Counterparties	13,765	6,083
Derivative Agreements [Member] | US Treasury Securities [Member]
Pledged Assets [Line Items]
Securities Pledged By Counterparties	$ 0	$ 0