LEASES - Components of Lease Expense (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)		Jun. 30, 2019 USD ($)
Leases [Abstract]
Operating lease assets	$ 13,120		$ 13,120
Finance lease assets	1,557		1,557
Total leased assets	14,677		14,677
Operating lease liabilities	13,150	[1]	13,150	[1]
Finance lease liabilities	1,719	[1]	1,719	[1]
Lease liabilities	14,869		14,869
Operating lease cost	345	[2]	719	[2]
Amortization of right-of-use assets	27		55
Interest on lease liabilities	17	[3]	34	[3]
Total finance lease cost	44		89
Total Lease Cost	$ 389		$ 808

[1] (2) Reflects the liability reported within other liabilities on the consolidated statements of condition.

[2] (1)Includes immaterial short-term and variable lease costs, but excludes common area maintenance costs.

[3] (2)Includes immaterial variable lease costs.