SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, Recently Adopted and New Accounting Pronouncements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Recently Adopted Accounting Pronouncements [Abstract]
Total assets	$ 11,410,295	$ 10,607,295	$ 10,746,198
Total liabilities	9,555,061	8,893,512
ASU 2016-02 [Member] | Cumulative Effect Adjustment [Member]
Recently Adopted Accounting Pronouncements [Abstract]
Total assets		34,200
Total liabilities		$ 34,200
ASU 2016-13 [Member] | Cumulative Effect Adjustment [Member]
New Accounting Pronouncements [Abstract]
Increase in retained earnings	500
Decrease in allowance for loan losses	(700)
Adjustment to loans	1,000
Increase in other liabilities	$ 1,200