VARIABLE INTEREST ENTITIES (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Cash and cash equivalents	$ 205,030	$ 211,834	$ 221,038	$ 173,857
Premises and equipment, net	164,638	119,988
Other assets	243,082	223,498
Total assets	11,410,295	10,607,295	$ 10,746,198
Accrued interest and other liabilities	215,221	157,459
Total liabilities	$ 9,555,061	8,893,512
Variable Interest Entity, Primary Beneficiary [Member] | 706 North Clinton [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net [Abstract]
Percentage of membership interest	50.00%
Cash and cash equivalents	$ 138	104
Premises and equipment, net	5,945	6,109
Other assets	42	33
Total assets	6,125	6,246
Accrued interest and other liabilities	1	0
Total liabilities	1	$ 0
Minority interest	3,100
Loss of minority interest	4,500
Minority interest loss exposure related to financing agreement	$ 1,400