DEPOSITS AND OTHER CUSTOMER ACCOUNTS (Summary of Deposits and Other Customer Accounts) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Balance
Interest-bearing demand deposits	$ 10,280,571	$ 10,301,133
Non-interest-bearing demand deposits	18,176,964	14,922,974
Savings	4,648,842	5,632,164
Customer repurchase accounts	366,336	407,477
Money market	31,387,665	26,687,677
CDs	4,385,602	9,375,281
Total Deposits	$ 69,245,980	$ 67,326,706
Percent of total deposits
Interest-bearing demand deposits (as a percent)	14.80%	15.30%
Non-interest-bearing demand deposits (as a percent)	26.20%	22.20%
Savings (as a percent)	6.70%	8.40%
Customer repurchase accounts (as a percent)	0.50%	0.60%
Money market (as a percent)	45.50%	39.60%
CDs (as a percent)	6.30%	13.90%
Total Deposits (as a percent)	100.00%	100.00%
Foreign deposits	$ 5,400,000	$ 8,900,000