LEASES - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases
Expense associated with operating leases		$ 6,900	$ 6,800
Operating Lease Cost	$ 5,772
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	5,711
Right-of-use assets obtained in exchange for new operating lease liabilities	1,388
Reduction to right-of-use asset resulting from reduction to lease liability	1,279
Operating lease right-of-use assets	$ 22,335
Operating lease, right-of-use asset, Statement of Financial Position	us-gaap:OtherAssets
Operating Lease Liabilities	$ 24,475
Operating lease liability, Statement of Financial Position	us-gaap:OtherLiabilities
Weighted-average remaining lease term - operating leases	4 years 8 months 8 days
Weighted-average discount rate - operating leases	2.33%
Minimum
Leases
Remaining lease terms - operating leases	1 year
Maximum
Leases
Remaining lease terms - operating leases	15 years