SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Accounting Standards Recently Adopted (Details)		6 Months Ended
	Jan. 01, 2020 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)
Accounting Standards Recently Adopted
Purchased financial assets with credit deterioration	$ 0
Operating lease right-to-use asset		$ 14,081,000	$ 12,926,000
Operating lease liabilities		$ 16,983,000	$ 15,704,000
LIBOR | Interest rate swaps
Accounting Standards Recently Adopted
Percentage of Loans		12.5
ASU 2016-13
Accounting Standards Recently Adopted
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]	true
Cumulative Effect on Retained Earnings, Net of Tax		$ (3,000,000.0)
Increase in allowance for credit losses	$ 874,000
Allowance for credit losses, unfunded commitments	2,900,000
Fresh-Start Adjustment, Increase (Decrease), Deferred Income Tax Assets, Noncurrent		$ 809,000
Amount of Credit Losses	$ 0
Accounting standards recently adopted	true