BORROWED FUNDS - Subordinated Debt (Details) - USD ($)	1 Months Ended		12 Months Ended
	Nov. 30, 2020	Jun. 30, 2014	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2007
Subordinated Debt
Balance at end of year			$ 43,407,000	$ 4,124,000
Subordinated debt redemption				12,400,000
Interest expense on borrowed funds			261,000	770,000	$ 1,756,000
Subordinated Debt
Subordinated Debt
Balance at end of year			43,407,000	4,124,000
Average balance during the year			7,568,000	12,125,000
Maximum month-end balance			$ 43,524,000	$ 17,524,000
Weighted-average rate during the year			3.45%	6.35%
Weighted-average rate at December 31			4.02%	3.51%
Face amount of debt issued	$ 40,000,000
Term of debt instrument	10 years
Interest rate on debt security	4.25%
Subordinated debt converted, amount				$ 1,000,000.0	$ 16,000,000.0
Subordinated debt converted into common stock (in shares)				62,500	1,000,000
Annual interest expense savings				$ 1,000,000.0	$ 1,100,000
Interest expense on borrowed funds			$ 300,000	$ 800,000	$ 1,800,000
SOFR | Subordinated Debt
Subordinated Debt
Variable rate basis spread	4.01%
Subordinated Debentures | Subordinated Debt
Subordinated Debt
Face amount of debt issued						$ 4,000,000
Subordinated Debentures | LIBOR | Subordinated Debt
Subordinated Debt
Variable rate basis spread			1.62%
Convertible Subordinated Promissory Notes Due 2024 | Subordinated Debt
Subordinated Debt
Face amount of debt issued		$ 29,400,000
Term of debt instrument		10 years
Debt instrument, investment amount of holder		$ 100,000
Debt instrument, minimum ownership of common stock as percentage of principal acquired		$ 1,000,000