COMMITMENTS, CONTINGENCIES, AND GUARANTEES (Off-Balance Sheet Risk and Guarantees) (Details) (USD $)								6 Months Ended			6 Months Ended					6 Months Ended									6 Months Ended			0 Months Ended
	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 FNMA [Member]	Jun. 30, 2014 Multi-family loans [Member] FNMA [Member]	Jun. 30, 2014 Residential mortgages [Member]	Dec. 31, 2013 Residential mortgages [Member]	Jun. 30, 2014 SCUSA [Member] Maximum [Member] CBP [Member]	Jun. 30, 2014 Commitments to extend credit [Member]	Dec. 31, 2013 Commitments to extend credit [Member]	Jun. 30, 2014 Unsecured revolving lines of credit [Member]	Dec. 31, 2013 Unsecured revolving lines of credit [Member]	Jun. 30, 2014 Letters of credit [Member]	Dec. 31, 2013 Letters of credit [Member]	Jun. 30, 2014 Letters of credit [Member] SCUSA [Member]	Jun. 30, 2014 Recourse and credit enhancement exposure on sold loans [Member]	Dec. 31, 2013 Recourse and credit enhancement exposure on sold loans [Member]	Jun. 30, 2014 Recourse and credit enhancement exposure on sold loans [Member] Multi-family loans [Member] FNMA [Member]	Dec. 31, 2013 Recourse and credit enhancement exposure on sold loans [Member] Multi-family loans [Member] FNMA [Member]	Jun. 30, 2014 Recourse and credit enhancement exposure on sold loans [Member] Residential mortgages [Member]	Dec. 31, 2013 Recourse and credit enhancement exposure on sold loans [Member] Residential mortgages [Member]	Jun. 30, 2014 Commitments to sell loans [Member]	Dec. 31, 2013 Commitments to sell loans [Member]	Jun. 30, 2014 Commitments to sell loans [Member] SCUSA [Member]	Jul. 03, 2013 Loan Purchase Commitments [Member] SCUSA [Member]	Jul. 03, 2013 Loan Purchase Commitments [Member] SCUSA [Member] Minimum [Member] July 2014 to July 2015 [Member]	Jul. 03, 2013 Loan Purchase Commitments [Member] SCUSA [Member] Minimum [Member] January 2014 to July 2017 [Member]
Commitments [Line Items]
One year or less												$ 4,923,076,000	$ 5,163,591,000			$ 1,662,827,000	$ 1,680,277,000
Over 1 year to 3 years												5,723,115,000	5,716,759,000			342,639,000	333,769,000
Over 3 years to 5 years												8,599,286,000	6,457,992,000			282,714,000	96,558,000
Over 5 years												6,352,327,000	6,313,449,000			6,105,000	5,623,000
Total commitments	30,243,686,000		26,771,985,000									25,597,804,000	23,651,791,000	2,106,144,000	815,573,000	2,294,285,000	2,116,227,000		178,089,000	184,584,000					67,364,000	3,810,000	300,000
Commitments, weighted average term																12 years 10 months 24 days
Value of underlying collateral																500,000,000					153,500,000	159,000,000
Reserve for unfunded lending commitments	170,274,000	180,000,000	220,000,000	210,000,000	210,000,000	210,000,000										97,800,000	129,800,000
Line of credit outstanding	72,500,000		90,200,000
Loans sold with recourse, unpaid principal balance																					3,000,000,000	4,300,000,000	61,300,000	65,700,000
Loans sold with recourse, portion of first credit loss position retained, percent								100.00%
Retained credit risk, multifamily servicing	51,700,000		68,000,000
Repurchase amount of loans							1,500,000,000	816,500,000
Loans sold with recourse, maximum exposure									24,600,000	25,600,000
Collateral posted	165,900,000		203,900,000																900,000	900,000
Forward contracts maturity period (less than one year)																									1 year
SCUSA Commitments [Abstract]
Letter of credit, maximum borrowing capacity																		500,000
Letters of credit outstanding																		0
Loss-sharing payment percentage											0.50%
Loan purchase commitment amount																													$ 30,000	$ 30,000
Loan purchase commitment, as a percentage of lending entity's near-prime originations																													75.00%	50.00%
Loan purchase commitment, cancellation pPeriod																												90 days