REPURCHASE AGREEMENTS - Maturities (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 218,542,000	$ 213,127,000
Outstanding repurchase obligations	$ 209,954,000	$ 200,396,000
Net weighted average borrowing rate	1.98%	2.56%
Overnight (1 Day or Less) [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 0	$ 0
Outstanding repurchase obligations	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%
Between 2 and 30 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 137,992,000	$ 107,876,000
Outstanding repurchase obligations	$ 132,573,000	$ 101,327,000
Net weighted average borrowing rate	2.02%	2.56%
Between 31 and 90 Days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 80,550,000	$ 105,251,000
Outstanding repurchase obligations	$ 77,381,000	$ 99,069,000
Net weighted average borrowing rate	1.92%	2.56%
Greater Than 90 days [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Fair Value of securities pledged, including accrued interest receivable	$ 0	$ 0
Outstanding repurchase obligations	$ 0	$ 0
Net weighted average borrowing rate	0.00%	0.00%