NON-INTEREST INCOME AND OTHER EXPENSES (Disaggregation by Revenue Source) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Lease income	$ 755,006	$ 705,835	$ 1,526,666	$ 1,380,720
Miscellaneous income/(loss)	(244,182)	(16,198)	(269,873)	(38,257)
Net gain/(loss) on sale of investment securities	22,516	2,379	31,795	379
Total out-of-scope of revenue from contracts with customers	592,367	767,810	1,401,976	1,484,382
Non-interest income	786,318	962,984	1,813,478	1,858,431
Total in-scope of revenue from contracts with customers
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	193,951	195,174	411,502	374,049
Depository services
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	41,825	60,115	99,029	116,282
Commission and trailer fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	45,552	40,987	97,264	79,636
Interchange income, net
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	15,599	17,851	31,919	32,963
Underwriting service fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	49,200	27,249	75,407	50,792
Asset and wealth management fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	26,271	37,077	69,291	73,997
Other revenue from contracts with customers
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	15,504	11,895	38,592	20,379
Consumer and commercial fees
Disaggregation of Revenue [Line Items]
Out-of-scope of revenue from contracts with customers	$ 59,027	$ 75,794	$ 113,388	$ 141,540