PREMISES AND EQUIPMENT - Calculated Amount of Right of Use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating leases liability	$ 8,313		$ 8,313		$ 8,700
Statement of Financial Condition
Operating leases right of use asset	8,163	$ 8,979	8,163	$ 8,979
Operating leases liability	8,313	9,073	8,313	9,073
Statement of Income
Operating lease costs classified as occupancy and equipment expense	394	400	768	785
Supplemental Cash Flow Information
Operating cash flows from operating leases	382	$ 387	743	758
Operating leases	$ 74		$ 74	$ 972