DEPOSITS AND OTHER CUSTOMER ACCOUNTS (Summary of Deposits and Other Customer Accounts) (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Balance
Interest-bearing demand deposits	$ 11,804,834,000	$ 10,301,133,000
Non-interest-bearing demand deposits	19,228,541,000	14,922,974,000
Savings	6,495,617,000	5,632,164,000
Customer repurchase accounts	354,404,000	407,477,000
Money market	30,551,312,000	26,687,677,000
CDs	5,528,540,000	9,375,281,000
Total Deposits	$ 73,963,248,000	$ 67,326,706,000
Percent of total deposits
Interest-bearing demand deposits (as a percent)	16.00%	15.30%
Non-interest-bearing demand deposits (as a percent)	26.00%	22.20%
Savings (as a percent)	8.80%	8.40%
Customer repurchase accounts (as a percent)	0.50%	0.60%
Money market (as a percent)	41.20%	39.60%
CDs (as a percent)	7.50%	13.90%
Total Deposits (as a percent)	100.00%	100.00%
Deposits held-for-sale	$ 4,700,000,000	$ 0
Foreign deposits	$ 9,700,000,000	$ 8,900,000,000