Santander Holdings USA (SOV) 10-Q 9 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	Santander Holdings USA, Inc.
Entity Central Index Key	811,830
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Current Fiscal Year End	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		530,391,043

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents		$ 7,900,607	$ 6,519,967
Investment securities:
Available-for-sale (AFS) at fair value		13,321,594	14,413,183
Held-to-maturity (HTM) (fair value of $2,797,698 and $1,773,938 as of March 31, 2018 and December 31, 2017, respectively)		2,877,357	1,799,808
Other investments (includes Trading securities of $3,024 and $1 as of March 31, 2018 and December 31, 2017, respectively)		765,041	658,864
Loans held-for-investment (LHFI)	[1],[2]	80,118,328	80,740,852
Allowance for loan and lease losses (ALLL)	[2]	(3,853,209)	(3,911,575)
Net LHFI		76,265,119	76,829,277
Loans held-for-sale (LHFS)	[3]	1,960,695	2,522,486
Premises and equipment, net	[4]	791,882	849,061
Operating lease assets, net	[2],[5]	10,770,896	10,474,308
Goodwill		4,444,389	4,444,389
Intangible assets, net		520,468	535,753
Bank-owned life insurance (BOLI)		1,804,133	1,795,700
Restricted cash	[2]	3,810,962	3,818,807
Other assets	[2],[6]	3,994,748	3,632,427
TOTAL ASSETS		129,227,891	128,294,030
LIABILITIES
Accrued expenses and payables		2,949,708	2,825,263
Deposits and other customer accounts		61,841,175	60,831,103
Borrowings and other debt obligations	[2]	38,350,245	39,003,313
Advance payments by borrowers for taxes and insurance		209,088	159,321
Deferred tax liabilities, net		1,037,909	969,996
Other liabilities	[2]	996,685	799,403
TOTAL LIABILITIES		105,384,810	104,588,399
STOCKHOLDER'S EQUITY
Preferred stock (no par value; $25,000 liquidation preference; 7,500,000 shares authorized; 8,000 shares outstanding at both March 31, 2018 and December 31, 2017)		195,445	195,445
Common stock and paid-in capital (no par value; 800,000,000 shares authorized; 530,391,043 shares outstanding at both March 31, 2018 and December 31, 2017)		17,732,184	17,723,010
Accumulated other comprehensive loss		(370,281)	(198,431)
Retained earnings		3,685,111	3,462,674
TOTAL SHUSA STOCKHOLDER'S EQUITY		21,242,459	21,182,698
Noncontrolling interest (NCI)		2,600,622	2,522,933
TOTAL STOCKHOLDER'S EQUITY		23,843,081	23,705,631
TOTAL LIABILITIES AND STOCKHOLDER'S EQUITY		$ 129,227,891	$ 128,294,030
[1]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.
[3]	Includes $162.5 million and $197.7 million of loans recorded at the fair value option ("FVO") at March 31, 2018 and December 31, 2017, respectively.
[4]	Net of accumulated depreciation of $1.5 billion and $1.4 billion at March 31, 2018 and December 31, 2017, respectively.
[5]	Net of accumulated depreciation of $3.1 billion and $3.4 billion at March 31, 2018 and December 31, 2017, respectively.
[6]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.

CONDENSED CONSOLIDATED BALANCE3

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($)		Mar. 31, 2018	Dec. 31, 2017
ASSETS
Held-to-maturity securities, fair value		$ 2,797,698,000	$ 1,773,938,000
Trading securities		3,024,000	1,000
Loans held for investment, fair value		167,600,000	186,500,000
Accumulated depreciation		1,500,000,000	1,400,000,000
Loans held-for-sale (LHFS)	[1]	1,960,695,000	2,522,486,000
Operating lease assets, net	[2],[3]	10,770,896,000	10,474,308,000
Restricted cash	[3]	3,810,962,000	3,818,807,000
Other assets	[3],[4]	3,994,748,000	3,632,427,000
Other liabilities	[3]	996,685,000	799,403,000
Operating leases, accumulated depreciation		$ (3,100,000,000)	$ (3,400,000,000)
STOCKHOLDER'S EQUITY
Preferred stock, no par value (in usd per share)
Preferred stock, liquidation preference		$ 25,000	$ 25,000
Preferred stock, shares authorized (in shares)		7,500,000	7,500,000
Preferred stock, shares outstanding (in shares)		8,000	8,000
Common stock, no par value (in usd per share)
Common stock, shares authorized (in shares)		800,000,000	800,000,000
Common stock, shares outstanding (in shares)		530,391,043	530,391,043
VIE, Primary Beneficiary
ASSETS
Loans held-for-sale (LHFS)		$ 22,121,392,000	$ 22,712,864,000
Operating lease assets, net		10,612,824,000	10,160,327,000
Restricted cash		2,380,619,000	1,995,557,000
Other assets		810,497,000	733,123,000
Borrowings and other debt obligations		28,634,362,000	28,469,999,000
Other liabilities		193,133,000	197,969,000
Residential mortgages
ASSETS
Mortgage servicing rights		160,130,000	145,993,000
Recurring
ASSETS
Trading securities		3,024,000	1,000
Loans held for investment, fair value		167,597,000	186,471,000
Loans held for sale		162,468,000	197,691,000
Mortgage servicing rights		$ 160,130,000	$ 145,993,000
[1]	Includes $162.5 million and $197.7 million of loans recorded at the fair value option ("FVO") at March 31, 2018 and December 31, 2017, respectively.
[2]	Net of accumulated depreciation of $3.1 billion and $3.4 billion at March 31, 2018 and December 31, 2017, respectively.
[3]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.
[4]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
INTEREST INCOME:
Loans		$ 1,747,734	$ 1,838,938
Interest-earning deposits		32,513	18,433
Investment securities:
AFS		73,505	81,427
HTM		17,064	10,632
Other investments		5,248	6,163
TOTAL INTEREST INCOME		1,876,064	1,955,593
INTEREST EXPENSE:
Deposits and other customer accounts		75,424	61,993
Borrowings and other debt obligations		304,690	291,035
TOTAL INTEREST EXPENSE		380,114	353,028
NET INTEREST INCOME		1,495,950	1,602,565
Provision for credit losses		502,534	735,445
NET INTEREST INCOME AFTER PROVISION FOR CREDIT LOSSES		993,416	867,120
NON-INTEREST INCOME:
Consumer and commercial fees		138,561	154,349
Lease income		540,896	496,045
Other miscellaneous (loss)/income, net	[1]	124,570	77,505
TOTAL FEES AND OTHER INCOME		804,027	727,899
Net (losses)/gains on sale of investment securities		(663)	519
TOTAL NON-INTEREST INCOME		803,364	728,418
GENERAL AND ADMINISTRATIVE EXPENSES:
Compensation and benefits		469,406	452,241
Occupancy and equipment expenses		159,340	162,712
Technology, outside service, and marketing expense		152,282	135,509
Loan expense		96,814	98,324
Lease expense		424,266	358,792
Other administrative expenses		103,554	102,238
TOTAL GENERAL AND ADMINISTRATIVE EXPENSES		1,405,662	1,309,816
OTHER EXPENSES:
Amortization of intangibles		15,288	15,491
Deposit insurance premiums and other expenses		16,761	17,830
Loss on debt extinguishment		2,212	6,749
Other miscellaneous expenses		3,601	3,006
TOTAL OTHER EXPENSES		37,862	43,076
INCOME BEFORE INCOME TAX PROVISION		353,256	242,646
Income tax provision		95,321	78,937
NET INCOME INCLUDING NCI		257,935	163,709
Net income attributable to NCI		74,397	50,628
NET INCOME ATTRIBUTABLE TO SANTANDER HOLDINGS USA, INC.		$ 183,538	$ 113,081
[1]	Includes impact of $70.5 million and $66.1 million in 2018 and 2017 of lower of cost or market adjustments on a portion of the Company's LHFS portfolio.

CONDENSED CONSOLIDATED STATEME5

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Lower of cost or market adjustment on a portion of unsecured loan portfolio held for sale	$ 70.5	$ 66.1

CONDENSED CONSOLIDATED STATEME6

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME INCLUDING NCI		$ 257,935	$ 163,709
OTHER COMPREHENSIVE INCOME, NET OF TAX
Net unrealized losses on cash flow hedge derivative financial instruments, net of tax	[1]	(17,365)	(2,487)
Net unrealized (losses) / gains on AFS investment securities, net of tax	[2]	(110,929)	20,969
Pension and post-retirement actuarial (losses) / gains, net of tax		(4,462)	485
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX		(132,756)	18,967
COMPREHENSIVE INCOME		125,179	182,676
NET INCOME ATTRIBUTABLE TO NCI		74,397	50,628
COMPREHENSIVE INCOME ATTRIBUTABLE TO SHUSA		$ 50,782	$ 132,048
[1]	Excludes $4.1 million and $3.0 million of other comprehensive income attributable to NCI for the three-month period ended March 31, 2018 and 2017, respectively.
[2]	Excludes $39.1 million impact of other comprehensive income reclassified to Retained earnings as a result of the adoption of ASU 2018-02.

CONDENSED CONSOLIDATED STATEME7

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME/(LOSS) (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Other comprehensive income attributable to noncontrolling interest	$ 4.1	$ 3
ASU 2018-02
Reclassification of AOCI to retained earnings	$ (39.1)

CONDENSED CONSOLIDATED STATEME8

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER’S EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Shares Outstanding	Preferred Stock	Common Stock and Paid-in Capital	Accumulated Other Comprehensive (Loss)/Income	Retained Earnings	Noncontrolling Interest	SC	SCNoncontrolling Interest
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standards	$ 25,709			$ (26,456)		$ 14,764	$ 37,401
Beginning balance (in shares) at Dec. 31, 2016		530,391,000
Equity, Beginning balance at Dec. 31, 2016	22,378,758		$ 195,445	16,599,497	$ (193,208)	3,020,149	2,756,875
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss)/income attributable to SHUSA	132,048				18,967	113,081
Other comprehensive income attributable to NCI	2,990						2,990
Net income attributable to NCI	50,628						50,628
Impact of SC stock option activity								$ 4,431	$ 4,431
Capital from shareholder	9,000			9,000
Stock issued in connection with employee benefit and incentive compensation plans	(164)			(164)
Dividends paid on preferred stock	(3,650)					(3,650)
Ending balance (in shares) at Mar. 31, 2017		530,391,000
Equity, Ending balance at Mar. 31, 2017	22,599,750		195,445	16,581,877	(174,241)	3,144,344	2,852,325
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment upon adoption of new accounting standards	$ 8,455				(39,094)	47,549
Beginning balance (in shares) at Dec. 31, 2017	530,391,043	530,391,000
Equity, Beginning balance at Dec. 31, 2017	$ 23,705,631		195,445	17,723,010	(198,431)	3,462,674	2,522,933
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive (loss)/income attributable to SHUSA	50,782				(132,756)	183,538
Other comprehensive income attributable to NCI	4,079						4,079
Net income attributable to NCI	74,397						74,397
Contribution from shareholder and related tax impact (Note17)	9,174			9,174
Stock issued in connection with employee benefit and incentive compensation plans	4,961						4,961
Dividends paid on common stock	(5,000)					(5,000)
Dividends paid to NCI	(5,748)						(5,748)
Dividends paid on preferred stock	$ (3,650)					(3,650)
Ending balance (in shares) at Mar. 31, 2018	530,391,043	530,391,000
Equity, Ending balance at Mar. 31, 2018	$ 23,843,081		$ 195,445	$ 17,732,184	$ (370,281)	$ 3,685,111	$ 2,600,622

CONDENSED CONSOLIDATED STATEME9

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income including NCI		$ 257,935	$ 163,709
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses		502,534	735,445
Deferred tax expense		84,567	75,276
Depreciation, amortization and accretion	[1]	437,506	349,747
Net loss on sale of loans		66,370	77,753
Net loss/(gain) on sale of investment securities		663	(519)
Net gain on sale of operating leases		(131)	(319)
Loss on debt extinguishment		2,212	6,749
Net loss on real estate owned and premises and equipment		1,476	2,285
Stock-based compensation		274	(1,406)
Equity loss on equity method investments		2,164	2,368
Originations of LHFS, net of repayments		(1,225,975)	(1,209,200)
Purchases of LHFS		(550)	(1,450)
Proceeds from sales of LHFS		1,789,969	1,559,128
Purchases of trading securities		(3,776)	(17,756)
Proceeds from sales of trading securities		1,640	9,145
Net change in:
Revolving personal loans		5,723	(5,064)
Other assets and BOLI		(305,866)	(403,187)
Other liabilities		346,354	272,351
NET CASH PROVIDED BY OPERATING ACTIVITIES		1,963,089	1,615,055
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from sales of AFS investment securities		39,446	0
Proceeds from prepayments and maturities of AFS investment securities		605,286	1,311,490
Purchases of AFS investment securities		(840,948)	(2,841,388)
Proceeds from prepayments and maturities of HTM investment securities		86,097	35,121
Proceeds from sales of other investments		25,946	64,469
Purchases of other investments		(109,576)	(13,199)
Proceeds from sales of LHFI		681,754	257,943
Proceeds from the sales of equity method investments		0	17,717
Distributions from equity method investments		1,111	1,144
Contributions to equity method and other investments		(23,832)	(11,660)
Proceeds from settlements of BOLI policies		6,043	12,426
Purchases of LHFI		(225,226)	(64,046)
Net change in loans other than purchases and sales		(421,195)	1,410,582
Purchases and originations of operating leases		(2,155,881)	(1,615,629)
Proceeds from the sale and termination of operating leases	[1]	1,164,362	940,879
Manufacturer incentives		213,784	326,946
Proceeds from sales of real estate owned and premises and equipment		12,017	14,187
Purchases of premises and equipment		(38,412)	(16,159)
NET CASH USED IN INVESTING ACTIVITIES		(979,224)	(169,177)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net change in deposits and other customer accounts		1,010,072	(639,456)
Net change in short-term borrowings		54,155	(59,595)
Net proceeds from long-term borrowings		11,482,934	15,124,445
Repayments of long-term borrowings		(11,751,288)	(15,525,950)
Repayments of FHLB advances (with terms greater than 3 months)		(450,000)	(1,600,000)
Net change in advance payments by borrowers for taxes and insurance		49,767	47,893
Cash dividends paid to preferred stockholders		(3,650)	(3,650)
Dividends paid on common stock		(5,000)	0
Dividends paid to noncontrolling interest		(5,748)	0
Proceeds from the issuance of common stock		1,947	2,473
Capital contribution from shareholder		5,741	9,000
NET CASH PROVIDED BY/(USED IN) FINANCING ACTIVITIES		388,930	(2,644,840)
NET INCREASE/(DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	[2]	1,372,795	(1,198,962)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	[2]	10,338,774	13,052,807
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	[2]	11,711,569	11,853,845
NON-CASH TRANSACTIONS
Loans transferred to/(from) other real estate owned		(25,435)	(3,717)
Loans transferred from/(to) held-for-investment (HFI)(from)/to held-for-sale, net (HFS)		700,160
Loans transferred from/(to) held-for-investment (HFI)(from)/to held-for-sale, net (HFS)			(18,992)
Unsettled purchases of investment securities		0	19,284
Residential loan securitizations		1,633	9,272
AFS investment securities transferred to held to maturity investment securities		$ 1,167,189	$ 0
[1]	March 31, 2017 cash flow activity has been updated for the operating lease cash flow classification correction. Refer to Note 1 - Basis of Presentation and Accounting Policies for additional information.
[2]	The beginning, ending and net change balances for the periods ended March 31, 2018 and March 31, 2017 include restricted cash balances of $3.8 billion, $3.8 billion, and $7.8 million; and $3.0 billion, $3.3 billion, and $0.3 billion, respectively.

CONDENSED CONSOLIDATED STATEM10

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018		Mar. 31, 2017
Statement of Cash Flows [Abstract]
Beginning restricted cash	$ 3,818,807	[1]	$ 3,000,000
Net change in restricted cash	7,800		300,000
Ending restricted cash	$ 3,810,962	[1]	$ 3,300,000
[1]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

BASIS OF PRESENTATION AND ACCOU

BASIS OF PRESENTATION AND ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
BASIS OF PRESENTATION AND ACCOUNTING POLICIES	BASIS OF PRESENTATION AND ACCOUNTING POLICIES Introduction Santander Holdings USA, Inc. ("SHUSA" or "the Company") is the parent company (the "Parent Company") of Santander Bank, National Association, (the "Bank" or "SBNA"), a national banking association; Santander Consumer USA Holdings Inc. (together with its subsidiaries, "SC"), a consumer finance company focused on vehicle finance; Santander BanCorp (together with its subsidiaries, "Santander BanCorp"), a financial holding company headquartered in Puerto Rico that offers a full range of financial services through its wholly-owned banking subsidiary, Banco Santander Puerto Rico ("BSPR"); Santander Securities LLC ("SSLLC"), a broker-dealer headquartered in Boston, Massachusetts; Banco Santander International ("BSI"), an Edge Act corporation located in Miami, Florida, that offers a full range of banking services to foreign individuals and corporations based primarily in Latin America; and Santander Investment Securities Inc. ("SIS"), a registered broker-dealer located in New York providing services in investment banking, institutional sales, and trading and offering research reports of Latin American and European equity and fixed income securities; as well as several other subsidiaries. SHUSA is headquartered in Boston and the Bank's home office is in Wilmington, Delaware. SHUSA is a wholly-owned subsidiary of Banco Santander, S.A. ("Santander"). The Parent Company's two largest subsidiaries by asset size and revenue are the Bank and SC. The Bank’s primary business consists of attracting deposits and providing other retail banking services through its network of retail branches, and originating small business loans, middle market, large and global commercial loans, multifamily loans, residential mortgage loans, home equity loans and lines of credit, and auto and other consumer loans throughout the Mid-Atlantic and Northeastern areas of the United States, focused throughout Pennsylvania, New Jersey, New York, New Hampshire, Massachusetts, Connecticut, Rhode Island, and Delaware. The Bank uses its deposits, as well as other financing sources, to fund its loan and investment portfolios. SC is a specialized consumer finance company focused on vehicle finance and third-party servicing. SC's primary business is the indirect origination and securitization of retail installment contracts ("RICs") principally through manufacturer-franchised dealers in connection with their sale of new and used vehicles to subprime retail consumers. In conjunction with a ten -year private label financing agreement with Fiat Chrysler Automobiles US LLC ("FCA") that became effective May 1, 2013 (the "Chrysler Agreement"), SC offers a full spectrum of auto financing products and services to FCA customers and dealers under the Chrysler Capital brand. These products and services include consumer RICs and leases, as well as dealer loans for inventory, construction, real estate, working capital and revolving lines of credit. Refer to Note 16 for additional details. As of March 31, 2018 , SC was owned approximately 68.0% by SHUSA and 32.0% by other shareholders. During 2017, SHUSA increased its ownership in SC; refer to additional details in Note 21 of the Company's Annual Report on Form 10-K as of December 31, 2017. Common shares of SC ("SC Common Stock") are listed on the New York Stock Exchange (the "NYSE") under the trading symbol "SC." Basis of Presentation These Condensed Consolidated Financial Statements include the assets, liabilities, revenues and expenses accounts of the Company and its consolidated subsidiaries, including the Bank, SC, and certain special purpose financing trusts utilized in financing transactions that are considered VIEs. The Company generally consolidates VIEs for which it is deemed to be the primary beneficiary and generally consolidates voting interest entities ("VOEs") in which the Company has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. These Consolidated Financial Statements have been prepared by the Company pursuant to Securities and Exchange Commission ("SEC") regulations. Additionally, where applicable, the Company's accounting policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. In the opinion of management, the accompanying Condensed Consolidated Financial Statements reflect all adjustments of a normal and recurring nature necessary for a fair statement of the Consolidated Balance Sheets, Statements of Operations, Statements of Comprehensive Income, Statements of Stockholder's Equity and Statements of Cash Flows ("SCF") for the periods indicated, and contain adequate disclosure for the fair statement of this interim financial information. Corrections to Previously Reported Amounts We have made certain corrections to previously disclosed amounts to correct for errors related to the classification of cash flows from the sale of automobiles returned to the Company at the end of a lease term. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) Operating Lease Cash Flow Classification Beginning June 30, 2014 through September 30, 2017, cash flows from the sale of automobiles returned to the Company at the end of a lease term were incorrectly recorded in the Consolidated SCF, resulting in an overstatement of cash flows from investing activities (Proceeds from the sale and termination of operating leases) and an understatement of cash flows from operating activities (Depreciation, amortization and accretion) in the amount of $149.9 million for the three-months ended March 31, 2017 . There was no net impact to cash provided by financing activities. The misclassification errors did not impact the net change in cash and cash equivalents, total cash and cash equivalents, net income, or any other operating measure. There was no impact to the Company's Consolidated Balance Sheets, Consolidated Statements of Operations, Consolidated Statements of Other Comprehensive Income, or Consolidated Statements of Equity for any period as a result of the Consolidated SCF error. Management has evaluated the errors and determined they are immaterial to previously issued financial statements. The Company has corrected the balance described above for the three-months ended March 31, 2017 in its Consolidated SCF included herein. In future filings, the Company will correct the Consolidated SCF disclosures for the comparative periods when presented. Significant Accounting Policies Management has identified (i) the allowance for loan losses for originated and purchased loans and the reserve for unfunded lending commitments, (ii) valuation of automotive leases and residuals, (iii) accretion of discounts and subvention on RICs, (iv) goodwill, (vi) fair value of financial instruments, and (v) income taxes as the Company's significant accounting policies and estimates, in that they are important to the portrayal of the Company's financial condition, results of operations and cash flows and the accounting estimates related thereto require management's most difficult, subjective and complex judgments as a result of the need to make estimates about the effect of matters that are inherently uncertain. These Condensed Consolidated Financial Statements should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2017. As of March 31, 2018 , with the exception of the items noted in the section captioned "Recently Adopted Accounting Standards" below, there have been no significant changes to the Company's accounting policies as disclosed in the Annual Report on Form 10-K for the year ended December 31, 2017. Recently Adopted Accounting Standards Since January 1, 2018, the Company adopted the following Financial Accounting Standards Board ("FASB") Accounting Standards Updates (“ASUs"): • ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as amended . This ASU requires an entity to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. It includes a five-step process to assist an entity in achieving the main principles of revenue recognition under ASC 606. Because the ASU does not apply to revenue associated with leases and financial instruments (including loans, securities, and derivatives), it did not have a material impact on the elements of the Company's Consolidated Statements of Operations most closely associated with leases and financial instruments (such as interest income, interest expense and securities gains and losses). The Company adopted this ASU as of January 1, 2018 using the modified retrospective method of transition, resulting in an immaterial cumulative-effect adjustment recorded to opening retained earnings for the current period. The adoption of this ASU did not result in material changes in the timing of the Company's revenue recognition, but requires gross presentation of certain costs previously offset against revenue. This change in presentation is reflected in the current period and will increase both noninterest revenue and noninterest expense for the Company. The increase is predominantly associated with certain distribution costs on wealth management products (historically offset against Miscellaneous income), with the remainder of the increase associated with certain underwriting service costs (historically offset against Miscellaneous income). Refer to Note 15 for additional details. Results for reporting periods beginning after January 1, 2018 are presented under the new revenue recognition standard, while prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) The cumulative-effect of the changes made to our January 1, 2018 Condensed Consolidated Balance Sheet for the adoption of the new revenue recognition standard were as follows: (in thousands) Balance at December 31, 2017 Adjustments Balance at January 1, 2018 Assets - LHFI $ 80,740,852 $ 5,514 $ 80,746,366 Other assets 3,632,427 (3,592 ) 3,628,835 Total Assets 128,294,030 1,922 128,295,952 Liabilities - Other liabilities 799,403 (1,378 ) 798,025 Total Liabilities 104,588,399 (1,378 ) 104,587,021 Stockholders' Equity - Retained earnings 3,462,674 3,300 3,465,974 Total Stockholders' Equity 23,705,631 3,300 23,708,931 The following discloses the impact on the Company's Condensed Balance Sheet at March 31, 2018 and the Condensed Statement of Operations for the three-months ended March 31, 2018 for the adoption of this new accounting standard: March 31, 2018 (in thousands) As Reported Balance Without Adoption Assets - LHFI $ 80,118,328 $ 80,113,022 Other assets 3,994,748 3,998,267 Total assets 129,227,891 129,226,104 Liabilities - Other liabilities 996,685 998,063 Total Liabilities 105,384,810 105,386,188 Stockholders' Equity - Retained earnings 3,685,111 3,681,946 Total Stockholders' Equity 23,843,081 23,839,916 Three-Month Period Ended March 31, 2018 (in thousands) As Reported Balance Without Adoption Non-interest income Consumer and commercial fees $ 138,561 $ 137,893 Miscellaneous income/(loss) 124,570 118,882 Total non-interest income 803,364 797,008 General and administrative expense Technology, outside service, and marketing expense 152,282 150,111 Loan expense 96,814 99,193 Other administrative expenses 103,554 96,782 Total general and administrative expenses 1,405,662 1,399,098 Income before income tax provision 353,256 353,464 Income tax provision 95,321 95,394 Net income $ 257,935 $ 258,070 NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) • ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, as amended. This new guidance amends the presentation and accounting for certain financial instruments, including liabilities measured at fair value under the FVO and equity investments. The guidance also updates fair value presentation and disclosure requirements for financial instruments measured at amortized cost. The Company adopted this standard on January 1, 2018, and it did not have a material impact on the Company's financial position or results of operations. As a result of the adoption of this standard, the Company reclassified approximately $10.0 million of equity securities from Investments AFS to Other Investments on January 1, 2018. Future changes in the fair value of the Company's equity securities will be recognized in the Condensed Consolidated Statements of Operations rather than Other comprehensive Income. • ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This new guidance amends the hedge accounting model to enable entities to better portray their risk management activities in their financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness, and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line in which the earnings effect of the hedged item is reported. The new guidance is effective for public companies for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The Company adopted this standard in the first quarter of 2018. It did not have a material impact on the opening balance of retained earnings for the cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness. Refer to Note 12 for further discussion of the Company's derivatives. • ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this ASU allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cut and Jobs Act of 2017 (the “TCJA"). As a result of adoption of this ASU in the first quarter of 2018, the Company reclassified $39.1 million from accumulated other comprehensive income with an offsetting credit to retained earnings. Cumulative net impact to opening Retained earnings As a result of the adoption of the new accounting standards outlined above, the Company recorded a cumulative net increase to opening Retained earnings of $42.0 million . Those impacts were attributed to the following ASUs adopted during the period: Impact to Retained earnings (in thousands) Adoption of ASU 2014-09, Revenue Recognition $ 3,300 Adoption of ASU 2016-1, Financial Instruments (418 ) Adoption of ASU 2018-02, Statement of Comprehensive Income 39,094 Cumulative-effect adjustment upon adoption of new accounting standards $ 41,976 Other adjustments at subsidiary 5,573 Net impact to opening Retained earnings $ 47,549 The adoption of the following ASUs did not have an impact on the Company's financial position or results of operations: • ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments • ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory • ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (A consensus of the FASB Emerging Issues Task Force) • ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business • ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets • ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost • ASU 2017-09 , Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting • ASU 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) As required by the adoption of ASU 2016-18 and ASU 2014-09, the following additional accounting policy disclosures are required for the nature of cash restrictions, and revenue recognized from contracts with customers from disclosures included in our Annual Report on Form 10-K for the year ended December 31, 2017: Cash, Cash Equivalents, and Restricted Cash Cash deposited to support securitization transactions, lockbox collections, and related required reserve accounts are recorded in the Company's Consolidated Balance Sheets as Restricted cash. Excess cash flows generated by Trusts are added to the restricted cash reserve account, creating additional over-collateralization until the contractual securitization requirement has been reached. Once the targeted reserve requirement is satisfied, additional excess cash flows generated by the Trusts are released to the Company as distributions from the Trusts. Lockbox collections are added to restricted cash and released when transferred to the appropriate warehouse line of credit or trust. The Company also maintains restricted cash primarily related to cash posted as collateral related to derivative agreements, cash restricted for investment purposes and cash advanced for loan purchases. Revenue Recognized from Contracts with Customers Depository services Depository services are performed under an agreement with a customer, and those services include: personal deposit account opening and maintaining, checking service, online banking service, debit card services, etc. Depository service fees related to customer deposits can generally be distinguished between monthly service fees and transactional fees within the single performance obligation of providing depository account services. Monthly account service and maintenance fees are provided over a period of time (usually a month), and revenue is recognized as the Company performs the service (usually at the end of the month). The services for transactional fees are performed at a point in time and revenue is recognized when the transaction occurs. Commissions and trailer fees Commission fees are earned from the selling of annuity contracts to customers on behalf of insurance companies, acting as the broker for certain equity trading, and sales of interests in mutual funds. The Company elected the expected value method for estimating commission fees, due to the large number of customer contracts with similar characteristics. However, commissions and trailer fees are fully constrained as the Company cannot sufficiently estimate the consideration to which it could be entitled to earn. Commissions are generally associated with point-in-time transactions or agreements that are one year or less. The performance obligation is satisfied immediately and revenue is recognized as the Company performs the service. Interchange income, net The Company has entered into agreements with payment networks, in which the Company will issue the payment network's credit card as part of the Company's credit card portfolio. Each time a cardholder makes a purchase at a merchant and the transaction is processed, the Company receives an interchange fee in exchange for the authorization and settlement services provided to the payment networks. The performance obligation for the Company is to provide authorization and settlement services to the payment network when the payment network submits a transaction for authorization. The Company considers the payment network to be the customer, and the Company is acting as a principal when performing the transaction authorization and settlement services. The performance obligation for authorization and settlement services is satisfied at point in time and revenue is recognized on the date when the Company authorizes and routes the payment to the merchant. The expenses paid to payment networks are accounted for as considerations payable to the customer and therefore reduce the transaction price. Therefore, interchange income is recorded net against the expenses paid to the payment network and the cost of rewards programs. The agreements also contain immaterial fixed consideration related to upfront sign-on bonuses and program development bonuses, which are amortized over the remainder of the agreement's life on a straight-line basis. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) Underwriting service fees SIS, as a registered broker-dealer, performs underwriting services by raising investment capital from investors on behalf of corporations that are issuing securities. Underwriting services have one performance obligation, which is satisfied on the day SIS purchases the securities. Underwriting services include multiple parties in delivering the performance obligation. The Company has evaluated whether it is the principal or agent when we provide underwriting services. The Company acts as the principal when performing underwriting services, and recognizes fees on a gross basis. Revenue is recorded as the difference between the price the Company pays the issuer of the securities and the public offering price, and expenses are recorded as the proportionate share of the underwriting costs incurred by SIS. The Company is the principal because we obtain control of the services provided by third-party vendors and combine them with other services as part of delivering on the underwriting service. Asset and wealth management fees Asset and wealth management fees includes fee income generated from discretionary investment management and non-discretionary investment advisory contracts with customers. Discretionary investment management fees are earned when the Company performs the administration and management of a customer’s account. The transaction price includes variable consideration, however there is uncertainty associated with accurately estimating revenue to be earned in the future. The Company earns and recognizes investment management fees on a quarterly basis based on the average assets under management. Non-discretionary investment advisory fees are earned when the Company provides investment advisory services to customers, such as recommending the rebalancing or restructuring of the securities in the Customer’s account. The transaction price for investment advisory fees includes both fixed consideration, in the form of a minimum annual fee, and variable consideration dependent on the average assets under management, calculated similarly to investment management fees above. The Company earns investment advisory fees on a quarterly basis based on the minimum annual fee and the average assets under management.

RECENT ACCOUNTING DEVELOPMENTS

RECENT ACCOUNTING DEVELOPMENTS	3 Months Ended
	Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
RECENT ACCOUNTING DEVELOPMENTS	RECENT ACCOUNTING DEVELOPMENTS In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The guidance, as amended, in this update supersedes the current lease accounting guidance for both lessees and lessors under ASC 840, Leases. The new guidance requires lessees to evaluate whether a lease is a finance lease using criteria similar to what lessees use today to determine whether they have a capital lease. Leases not classified as finance leases are classified as operating leases. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. The lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similarly to today’s guidance for operating leases. The new guidance will require lessors to account for leases using an approach that is substantially similar to the existing guidance. This new guidance will be effective for the Company for the first reporting period beginning after December 15, 2018, with earlier adoption permitted. The Company does not intend to early adopt this ASU. Adoption of this amendment must be applied on a modified retrospective approach. The Company is in the process of reviewing our existing property and equipment lease contracts, as well as service contracts that may include embedded leases. Upon adoption, the Company expects to report higher assets and liabilities from recording the present value of the future minimum lease payments of the leases. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments . This new guidance significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For AFS debt securities, entities will be required to record allowances rather than reduce the carrying amount, as they do today under the other-than-temporary impairment (“OTTI') model. The standard also simplifies the accounting model for purchased credit-impaired debt securities and loans. The new guidance will be effective for the Company for the first reporting period beginning after December 15, 2019, with earlier adoption permitted. Adoption of this new guidance can be applied only on a prospective basis as a cumulative-effect adjustment to retained earnings. The Company is currently evaluating the impact of the new guidance on its Consolidated Financial Statements. It is expected that the new model will include different assumptions used in calculating credit losses, such as estimating losses over the estimated life NOTE 2. RECENT ACCOUNTING DEVELOPMENTS (continued) of a financial asset, and will consider expected future changes in macroeconomic conditions. The adoption of this ASU may result in an increase to the Company’s allowance for credit losses ("ACL"), which will depend upon the nature and characteristics of the Company's portfolio at the adoption date, as well as the macroeconomic conditions and forecasts at that date. The Company currently does not intend to early adopt this new guidance. In addition to those described in detail above, the Company is in the process of evaluating the following ASUs, and does not expect them to have a material impact on the Company's financial position, results of operations, or disclosures: • ASU 2017-06, Plan Accounting: Defined Benefit Pension Plans (Topic 960), Defined Contribution Pension Plans (Topic 962), Health and Welfare Benefit Plans (Topic 965): Employee Benefit Plan Master Trust Reporting (a consensus of the Emerging Issues Task Force) • ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities • ASU 2017-11, Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception

INVESTMENT SECURITIES

INVESTMENT SECURITIES	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
INVESTMENT SECURITIES	INVESTMENT SECURITIES Summary of Investment in Debt Securities - AFS and HTM The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of debt securities AFS at the dates indicated: March 31, 2018 December 31, 2017 (in thousands) Amortized Gross Gross Fair Amortized Gross Gross Fair U.S. Treasury securities $ 1,388,611 $ 4 $ (13,510 ) $ 1,375,105 $ 1,006,219 $ — $ (8,107 ) $ 998,112 Corporate debt securities 2,722 1 — 2,723 11,639 21 — 11,660 Asset-backed securities (“ABS”) 482,770 6,341 (1,879 ) 487,232 501,575 6,901 (1,314 ) 507,162 Equity securities (1) — — — — 11,428 — (614 ) 10,814 State and municipal securities 21 — — 21 23 — — 23 Mortgage-backed securities (“MBS”): GNMA - Residential 3,999,258 5,022 (99,197 ) 3,905,083 4,745,998 3,531 (62,524 ) 4,687,005 GNMA - Commercial 895,577 82 (17,192 ) 878,467 1,377,449 179 (19,917 ) 1,357,711 FHLMC and FNMA - Residential 6,879,034 417 (228,635 ) 6,650,816 6,958,433 1,093 (141,393 ) 6,818,133 FHLMC and FNMA - Commercial 22,840 — (693 ) 22,147 23,003 — (440 ) 22,563 Total investments in debt securities AFS $ 13,670,833 $ 11,867 $ (361,106 ) $ 13,321,594 $ 14,635,767 $ 11,725 $ (234,309 ) $ 14,413,183 (1) Reflects the reclassification of the Company's investments in equity securities to Other investments as a result of the adoption of ASU 2016-01 as of January 1, 2018. The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of debt securities HTM at the dates indicated: March 31, 2018 December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Gross Gross Fair MBS: GNMA - Residential $ 1,947,672 $ — $ (62,258 ) $ 1,885,414 $ 1,447,669 $ 722 $ (26,150 ) $ 1,422,241 GNMA - Commercial 929,685 — (17,401 ) 912,284 352,139 325 (767 ) 351,697 Total investments in debt securities HTM $ 2,877,357 $ — $ (79,659 ) $ 2,797,698 $ 1,799,808 $ 1,047 $ (26,917 ) $ 1,773,938 NOTE 3. INVESTMENT SECURITIES (continued) The Company continuously evaluates its investment strategies in light of changes in the regulatory and market environments that could have an impact on capital and liquidity. Based on this evaluation, it is reasonably possible that the Company may elect to pursue other strategies relative to its investment securities portfolio. During the three-month period ended March 31, 2018 , the Company transferred approximately $1.2 billion of MBS from AFS to HTM in conjunction with Santander's capital management strategy. As of March 31, 2018 and December 31, 2017 , the Company had investments in debt securities AFS with an estimated fair value of $6.1 billion and $5.9 billion , respectively, pledged as collateral, which was comprised of the following: $3.1 billion and $3.0 billion , respectively, were pledged as collateral for the Company's borrowing capacity with the Federal Reserve Bank (the "FRB"); $2.1 billion and $2.3 billion , respectively, were pledged to secure public fund deposits; $225.1 million and $243.8 million , respectively, were pledged to various independent parties to secure repurchase agreements, support hedging relationships, and for recourse on loan sales; $347.4 million and $0.0 million , respectively, were pledged to deposits with clearing organizations; and $325.6 million and $387.9 million , respectively, were pledged to secure the Company's customer overnight sweep product. At March 31, 2018 and December 31, 2017 , the Company had $44.9 million and $47.0 million , respectively, of accrued interest related to investment securities which is included in the Other assets line of the Company's Condensed Consolidated Balance Sheets . Contractual Maturity of Debt Securities Contractual maturities of the Company’s debt securities AFS at March 31, 2018 were as follows: (in thousands) Amortized Cost Fair Value Due within one year $ 540,050 $ 539,712 Due after 1 year but within 5 years 1,214,394 1,207,322 Due after 5 years but within 10 years 169,152 165,500 Due after 10 years 11,747,237 11,409,060 Total $ 13,670,833 $ 13,321,594 Contractual maturities of the Company’s debt securities HTM at March 31, 2018 were as follows: (in thousands) Amortized Cost Fair Value Due within one year $ — $ — Due after 1 year but within 5 years — — Due after 5 years but within 10 years — — Due after 10 years $ 2,877,357 $ 2,797,698 Total $ 2,877,357 $ 2,797,698 Actual maturities may differ from contractual maturities when there is a right to call or prepay obligations with or without call or prepayment penalties. NOTE 3. INVESTMENT SECURITIES (continued) Gross Unrealized Loss and Fair Value of Debt Securities AFS and HTM The following tables present the aggregate amount of unrealized losses as of March 31, 2018 and December 31, 2017 on securities in the Company’s AFS investment portfolios classified according to the amount of time those securities have been in a continuous loss position: March 31, 2018 December 31, 2017 Less than 12 months 12 months or longer Less than 12 months 12 months or longer (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 1,097,855 $ (8,900 ) $ 247,265 $ (4,610 ) $ 998,112 $ (8,107 ) $ — $ — Corporate debt securities 1,086 — 13 — — — — — ABS 46,388 (260 ) 92,232 (1,619 ) 8,013 (125 ) 103,559 (1,189 ) Equity securities (1) — — — — 335 (2 ) 10,398 (612 ) MBS: GNMA - Residential 1,246,568 (28,253 ) 1,807,860 (70,944 ) 1,236,716 (8,600 ) 2,583,955 (53,924 ) GNMA - Commercial 817,989 (16,664 ) 34,670 (528 ) 1,022,452 (11,492 ) 251,209 (8,425 ) FHLMC and FNMA - Residential 3,703,742 (81,349 ) 2,846,957 (147,286 ) 3,429,678 (32,899 ) 3,017,533 (108,494 ) FHLMC and FNMA - Commercial 6,772 (238 ) 15,375 (455 ) 6,948 (103 ) 15,614 (337 ) Total investments in debt securities AFS $ 6,920,400 $ (135,664 ) $ 5,044,372 $ (225,442 ) $ 6,702,254 $ (61,328 ) $ 5,982,268 $ (172,981 ) (1) Reflects the reclassification of the Company's investments in equity securities to Other investments as a result of the adoption of ASU 2016-01 as of January 1, 2018. The following tables present the aggregate amount of unrealized losses as of March 31, 2018 and December 31, 2017 on debt securities in the Company’s held-to-maturity investment portfolios classified according to the amount of time those securities have been in a continuous loss position: March 31, 2018 December 31, 2017 Less than 12 months 12 months or longer Less than 12 months 12 months or longer (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Fair Value Unrealized MBS: GNMA - Residential $ 642,688 $ (20,624 ) $ 1,242,725 $ (41,634 ) $ 434,322 $ (6,419 ) $ 739,612 $ (19,731 ) GNMA - Commercial 624,936 (13,073 ) 287,348 (4,328 ) 118,951 (767 ) — — Total investments in debt securities HTM $ 1,267,624 $ (33,697 ) $ 1,530,073 $ (45,962 ) $ 553,273 $ (7,186 ) $ 739,612 $ (19,731 ) OTTI Management evaluates all investment securities in an unrealized loss position for OTTI on a quarterly basis. An unrealized loss exists when the current fair value of an individual security is less than its amortized cost basis. The OTTI assessment is a subjective process requiring the use of judgments and assumptions. During the securities-level assessments, consideration is given to (1) the intent not to sell and probability that the Company will not be required to sell the security before recovery of its cost basis to allow for any anticipated recovery in fair value, (2) the financial condition and near-term prospects of the issuer, as well as company news and current events, and (3) the ability to collect the future expected cash flows. Key assumptions utilized to forecast expected cash flows may include loss severity, expected cumulative loss percentage, cumulative loss percentage to date, weighted average Fair Isaac Corporation ("FICO") scores and weighted average loan-to-value ("LTV") ratio, rating or scoring, credit ratings and market spreads, as applicable. The Company assesses and recognizes OTTI in accordance with applicable accounting standards. Under these standards, if the Company determines that impairment on its debt securities exists and it has made the decision to sell the security or it is more likely than not that the Company will be required to sell the security prior to recovery of its amortized cost basis, it recognizes the entire portion of the unrealized loss in earnings. If the Company has not made a decision to sell the security and it does not expect that it will be required to sell the security prior to the recovery of the amortized cost basis but the Company has determined that OTTI exists, it recognizes the credit-related portion of the decline in value of the security in earnings. The Company recorded no OTTI related to its investment securities for the three-month periods ended March 31, 2018 and 2017 , respectively. NOTE 3. INVESTMENT SECURITIES (continued) Management has concluded that the unrealized losses on its debt securities for which it has not recognized OTTI (which were comprised of 531 individual securities at March 31, 2018 ) are temporary in nature since (1) they reflect the increase in interest rates, which lowers the current fair value of the securities, (2) they are not related to the underlying credit quality of the issuers, (3) the entire contractual principal and interest due on these securities is currently expected to be recoverable, (4) the Company does not intend to sell these investments at a loss and (5) it is more likely than not that the Company will not be required to sell the investments before recovery of the amortized cost basis, which for the Company's debt securities may be at maturity. Accordingly, the Company has concluded that the impairment on these securities is not other than temporary. Gains (Losses) and Proceeds on Sales of Debt Securities Proceeds from sales of investments in debt securities and the realized gross gains and losses from those sales are as follows: Three-Month Period Ended March 31, (in thousands) 2018 2017 Proceeds from the sales of debt securities AFS $ 39,446 $ — Gross realized gains $ — $ — Gross realized losses (18 ) — OTTI — — Net realized gains/(losses) (1) $ (18 ) $ — (1) Excludes the net realized gains/(losses) related to investments in debt securities held for trading purposes. The Company uses the specific identification method to determine the cost of the securities sold and the gain or loss recognized. The Company recognized $18.0 thousand for the three-month period ended March 31, 2018 in net losses on the sale of AFS investment securities as a result of overall balance sheet and interest rate risk management. The net loss realized for the three-month period ended March 31, 2018 was primarily comprised of the sale of MBS, including FHLMC residential debt securities and collateralized mortgage obligations ("CMOs"), with a fair value of $319 thousand for a loss of $18 thousand . There was no significant activity for the three-month period ended March 31, 2017. Other Investments Other Investments consisted of the following as of: (in thousands) March 31, 2018 December 31, 2017 FHLB of Pittsburgh and Federal Reserve Bank stock $ 500,833 $ 516,693 Low Income Housing Tax Credit investments ("LIHTC") 96,899 88,170 Equity Securities not held for trading 10,927 — CDs with a maturity greater than 90 days 153,358 54,000 Trading Securities 3,024 1 Total $ 765,041 $ 658,864 Other investments primarily include the Company's investment in the stock of the Federal Home Loan Bank ("FHLB") of Pittsburgh and the FRB. These stocks do not have readily determinable fair values because their ownership is restricted and they lack a market. The stocks can be sold back only at their par value of $100 per share, and FHLB stock can be sold back only to the FHLB or to another member institution. Accordingly, these stocks are carried at cost. During the three-month period ended March 31, 2018 , the Company purchased $10.2 million of FHLB stock at par and redeemed $25.9 million of FHLB stock at par. There was no gain or loss associated with these redemptions. During the three-month period ended March 31, 2018 , the Company did no t purchase any FRB stock. Other investments also includes low-income housing tax credit (“LIHTC") investments, time deposits with a maturity of greater than 90 days held at non-affiliated financial institutions, trading securities, and $10.9 million of equity securities measured at fair value with changes in fair value NOTE 3. INVESTMENT SECURITIES (continued) recognized in net income. These consist primarily of Community Reinvestment Act (“CRA") mutual fund investments reclassified as a result of the first quarter 2018 adoption of ASU 2016-01, discussed further in Note 1. These investments were included in Investments AFS at December 31, 2017. With the exception of equity and trading securities which are measured at fair value, the Company evaluates these other investments for impairment based on the ultimate recoverability of the carrying value, rather than by recognizing temporary declines in value. Realized and Unrealized Gains (Losses) on Equity Securities Three-Month Period Ended March 31, (in thousands) 2018 2017 Net gains/(losses) on equity securities 1 $ 47 $ (18 ) Less: net gains/(losses) recognized during the period on equity securities sold during the period 1 — — Unrealized gains/(losses) recognized during the reporting period on equity securities still held at the reporting period date 1 $ 47 $ (18 ) (1) Changes in the fair value of equity securities were not recognized in earnings prior to the adoption of ASU 2016-01. The Company held an immaterial amount of equity securities without readily determinable fair values at the reporting date.

LOANS AND ALLOWANCE FOR CREDIT

LOANS AND ALLOWANCE FOR CREDIT LOSSES	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
LOANS AND ALLOWANCE FOR CREDIT LOSSES	=640 3,759,038 14.6 % 3,759,621 14.5 % Total $ 25,718,981 100.0 % $ 26,017,340 100.0 % (1) Consists primarily of loans for which credit scores are not considered in the ALLL model. (2) Credit scores updated quarterly. (3) RICs and auto loans include $620.2 million and $1.1 billion of LHFS at March 31, 2018 and December 31, 2017 , respectively, that do not have an allowance. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Consumer Lending Asset Quality Indicators-FICO and LTV Ratio For both residential and home equity loans, loss severity assumptions are incorporated in the loan and lease loss reserve models to estimate loan balances that will ultimately charge off. These assumptions are based on recent loss experience within various current LTV bands within these portfolios. LTVs are refreshed quarterly by applying Federal Housing Finance Agency Home price index changes at a state-by-state level to the last known appraised value of the property to estimate the current LTV. The Company's ALLL incorporates the refreshed LTV information to update the distribution of defaulted loans by LTV as well as the associated loss given default for each LTV band. Reappraisals on a recurring basis at the individual property level are not considered cost-effective or necessary; however, reappraisals are performed on certain higher risk accounts to support line management activities, default servicing decisions, or when other situations arise for which the Company believes the additional expense is warranted. Residential mortgage and home equity financing receivables by LTV and FICO range are summarized as follows: Residential Mortgages (1)(3) March 31, 2018 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 266,671 $ 6,616 $ 1,208 $ — $ — $ — $ — $ 274,495 <600 13 223,009 54,447 33,835 21,303 2,609 1,422 336,638 600-639 44 155,786 41,930 34,643 32,438 1,229 6,283 272,353 640-679 34 319,185 97,132 89,991 90,856 2,446 2,502 602,146 680-719 95 579,125 254,807 138,197 163,235 3,436 9,669 1,148,564 720-759 173 1,004,260 573,335 188,949 195,187 4,819 7,740 1,974,463 >=760 563 3,148,412 1,106,980 290,938 200,107 8,371 11,046 4,766,417 Grand Total $ 267,593 $ 5,436,393 $ 2,129,839 $ 776,553 $ 703,126 $ 22,910 $ 38,662 $ 9,375,076 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and combined LTV ("CLTV") for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) March 31, 2018 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 190,747 $ 1,393 $ 478 $ — $ — $ 192,618 <600 7,436 195,852 69,172 19,838 7,444 299,742 600-639 4,896 150,132 56,266 7,613 6,090 224,997 640-679 4,793 279,728 123,431 17,573 10,114 435,639 680-719 6,921 506,113 245,154 21,419 16,864 796,471 720-759 7,073 719,337 325,201 31,454 14,985 1,098,050 >=760 14,169 1,881,952 746,823 64,040 34,181 2,741,165 Grand Total $ 236,035 $ 3,734,507 $ 1,566,525 $ 161,937 $ 89,678 $ 5,788,682 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Residential Mortgages (1)(3) December 31, 2017 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 372,116 $ 6,759 $ 1,214 $ — $ — $ — $ — $ 380,089 <600 21 220,737 55,108 35,617 23,834 2,505 6,020 343,842 600-639 45 155,920 42,420 35,009 34,331 2,696 6,259 276,680 640-679 37 320,248 94,601 90,708 86,740 3,011 2,641 597,986 680-719 98 554,058 236,602 136,980 147,754 3,955 10,317 1,089,764 720-759 92 952,532 480,900 178,876 183,527 4,760 8,600 1,809,287 >=760 588 3,019,514 1,066,919 263,541 187,713 8,418 12,594 4,559,287 Grand Total $ 372,997 $ 5,229,768 $ 1,977,764 $ 740,731 $ 663,899 $ 25,345 $ 46,431 $ 9,056,935 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) December 31, 2017 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 154,690 $ 536 $ 238 $ — $ — $ 155,464 <600 8,064 190,657 64,554 16,634 22,954 302,863 600-639 6,276 158,461 61,250 9,236 9,102 244,325 640-679 6,745 297,003 127,347 19,465 14,058 464,618 680-719 8,875 500,234 258,284 24,675 20,261 812,329 720-759 8,587 724,831 332,508 30,526 19,119 1,115,571 >=760 17,499 1,917,373 768,905 73,573 35,213 2,812,563 Grand Total $ 210,736 $ 3,789,095 $ 1,613,086 $ 174,109 $ 120,707 $ 5,907,733 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. TDR Loans The following table summarizes the Company’s performing and non-performing TDRs at the dates indicated: (in thousands) March 31, 2018 December 31, 2017 Performing $ 5,811,401 $ 5,824,304 Non-performing 785,958 982,868 Total $ 6,597,359 $ 6,807,172 Commercial Loan TDRs All of the Company’s commercial loan modifications are based on the circumstances of the individual customer, including specific customers' complete relationships with the Company. Loan terms are modified to meet each borrower’s specific circumstances at a point in time and may allow for modifications such as term extensions and interest rate reductions. Modifications for commercial loan TDRs generally, although not always, result in bifurcation of the original loan into A and B notes. The A note is restructured to allow for upgraded risk rating and return to accrual status after a sustained period of payment performance has been achieved (typically six months for monthly payment schedules). The B note, if any, is structured as a deficiency note; the balance is charged off but the debt is usually not forgiven. Commercial TDRs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically six months for a monthly amortizing loan). TDRs are subject to analysis for specific reserves by either calculating the present value of expected future cash flows or, if collateral-dependent, calculating the fair value of the collateral less its estimated " id="sjs-B4" xml:space="preserve"> LOANS AND ALLOWANCE FOR CREDIT LOSSES Overall The Company's loans are reported at their outstanding principal balances net of any cumulative charge-offs, unamortized deferred fees and costs and unamortized premiums or discounts. The Company maintains an ACL to provide for losses inherent in its portfolios. Certain loans are pledged as collateral for borrowings, securitizations, or special purpose entities (“SPEs"). These loans totaled $47.3 billion at March 31, 2018 and $50.8 billion at December 31, 2017 . Loans that the Company intends to sell are classified as LHFS. The LHFS portfolio balance at March 31, 2018 was $2.0 billion , compared to $2.5 billion at December 31, 2017 . LHFS in the residential mortgage portfolio are reported at either estimated fair value (if the fair value option (the "FVO") is elected) or the lower of cost or fair value. For a discussion on the valuation of LHFS at fair value, see Note 14 to the Condensed Consolidated Financial Statements . Loans under SC’s personal lending platform have been classified as HFS and adjustments to lower of cost or market are recorded through Miscellaneous Income (Expense), net on the Condensed Consolidated Statements of Operations . As of March 31, 2018 , the carrying value of the personal unsecured HFS portfolio was $1.0 billion . Interest on loans is credited to income as it is earned. Loan origination fees and certain direct loan origination costs are deferred and recognized as adjustments to interest income in the Condensed Consolidated Statements of Operations over the contractual life of the loan utilizing the interest method. Loan origination costs and fees and premiums and discounts on RICs are deferred and recognized in interest income over their estimated lives using estimated prepayment speeds, which are updated on a monthly basis. At March 31, 2018 and December 31, 2017 , accrued interest receivable on the Company's loans was $450.0 million and $515.9 million , respectively. During the quarter ended March 31, 2018 , the Company sold substantially all of its mortgage warehouse facilities, which had a book value of $499.2 million for net proceeds of $515.8 million . The $16.7 million gain on sale is recognized within Miscellaneous income, net on the Condensed Consolidated Statements of Operations. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Loan and Lease Portfolio Composition The following presents the composition of the gross loans and leases HFI by portfolio and by rate type: March 31, 2018 December 31, 2017 (dollars in thousands) Amount Percent Amount Percent Commercial LHFI: Commercial real estate ("CRE") loans $ 9,072,529 11.3 % $ 9,279,225 11.5 % Commercial and industrial loans 13,712,573 17.1 % 14,438,311 17.9 % Multifamily loans 8,081,924 10.1 % 8,274,435 10.1 % Other commercial (2) 7,337,433 9.2 % 7,174,739 8.9 % Total commercial LHFI 38,204,459 47.7 % 39,166,710 48.4 % Consumer loans secured by real estate: Residential mortgages 9,198,059 11.5 % 8,846,765 11.0 % Home equity loans and lines of credit 5,788,682 7.2 % 5,907,733 7.3 % Total consumer loans secured by real estate 14,986,741 18.7 % 14,754,498 18.3 % Consumer loans not secured by real estate: RICs and auto loans - originated 23,583,727 29.4 % 23,081,424 28.6 % RICs and auto loans - purchased 1,515,086 1.9 % 1,834,868 2.3 % Personal unsecured loans 1,261,238 1.6 % 1,285,677 1.6 % Other consumer (3) 567,077 0.7 % 617,675 0.8 % Total consumer loans 41,913,869 52.3 % 41,574,142 51.6 % Total LHFI (1) $ 80,118,328 100.0 % $ 80,740,852 100.0 % Total LHFI: Fixed rate $ 51,066,020 63.7 % $ 50,653,790 62.7 % Variable rate 29,052,308 36.3 % 30,087,062 37.3 % Total LHFI (1) $ 80,118,328 100.0 % $ 80,740,852 100.0 % (1) Total LHFI includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts as well as purchase accounting adjustments. These items resulted in a net increase in the loan balances of $1.4 billion and $1.3 billion as of March 31, 2018 and December 31, 2017 , respectively. (2) Other commercial includes commercial equipment vehicle financing ("CEVF") leveraged leases and loans. (3) Other consumer primarily includes recreational vehicle ("RV") and marine loans. Portfolio segments and classes Generally accepted accounting principles (“GAAP") requires that entities disclose information about the credit quality of their financing receivables at disaggregated levels, specifically defined as “portfolio segments” and “classes,” based on management’s systematic methodology for determining the ACL. The Company utilizes similar categorization compared to the financial statement categorization of loans to model and calculate the ACL and track the credit quality, delinquency and impairment status of the underlying loan populations. In disaggregating its financing receivables portfolio, the Company’s methodology begins with the commercial and consumer segments. The commercial segmentation reflects line of business distinctions. The CRE line of business includes commercial and industrial owner-occupied real estate and specialized lending for investment real estate. The Company's allowance methodology further classifies loans in this line of business into construction and non-construction loans; however, the methodology for development and determination of the allowance is generally consistent between the two portfolios. "Commercial and industrial" includes non-real estate-related commercial and industrial loans. "Multifamily" represents loans for multifamily residential housing units. “Other commercial” includes loans to global customer relationships in Latin America which are not defined as commercial or consumer for regulatory purposes. The remainder of the portfolio primarily represents the CEVF business. The Company's portfolio classes are substantially the same as its financial statement categorization of loans for the consumer loan populations. “Residential mortgages” includes mortgages on residential property, including single family and 1-4 family units. "Home equity loans and lines of credit" include all organic home equity contracts and purchased home equity portfolios. "RICs and auto loans" includes the Company's direct automobile loan portfolios, but excludes RV and marine RICs. "Personal unsecured loans" includes personal revolving loans and credit cards. “Other consumer” includes an acquired portfolio of marine RICs and RV contracts as well as indirect auto loans. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) In accordance with the Company's accounting policy when establishing the collective ACL for originated loans, the Company's estimate of losses on recorded investment includes the estimate of the related net unaccreted discount balance that is expected at the time of charge-off, while it considers the entire unaccreted discount for loan portfolios purchased at a discount as available to absorb the credit losses when determining the ACL specific to these portfolios. This accounting policy is not applicable for the purchased loan portfolios acquired with evidence of credit deterioration, on which we elected to apply the FVO. The RIC and auto loan portfolio is comprised of: (1) RICs originated by SC prior to the first quarter 2014 consolidation and change in control of SC (the “Change in Control"), (2) RICs originated by SC after the Change in Control, and (3) auto loans originated by SBNA. The composition of the portfolio segment is as follows: (in thousands) March 31, 2018 December 31, 2017 RICs - Purchased HFI: Unpaid principal balance ("UPB") (1) $ 1,592,887 $ 1,929,548 UPB - FVO (2) 19,773 24,926 Total UPB 1,612,660 1,954,474 Purchase marks (3) (97,574 ) (119,606 ) Total RICs - Purchased HFI 1,515,086 1,834,868 RICs - Originated HFI: UPB (1) 23,817,893 23,373,202 Net discount (272,727 ) (309,920 ) Total RICs - Originated 23,545,166 23,063,282 SBNA auto loans 38,561 18,142 Total RICs - originated post Change in Control 23,583,727 23,081,424 Total RICs and auto loans HFI $ 25,098,813 $ 24,916,292 (1) UPB does not include amounts related to the loan receivables - unsecured and loan receivables from dealers due to the short-term and revolving nature of these receivables. (2) The Company elected to account for these loans, which were acquired with evidence of credit deterioration, under the FVO. (3) Includes purchase marks of $4.4 million and $5.5 million related to purchase loan portfolios on which we elected to apply the FVO at March 31, 2018 and December 31, 2017 , respectively. During the three-month periods ended March 31, 2018 and 2017 , the Company originated $2.0 billion and $1.6 billion , respectively, in Chrysler Capital loans, which represented 46% and 42% , respectively, of the Company's total RIC originations. As of March 31, 2018 and December 31, 2017 , the Company's auto RIC portfolio consisted of $7.0 billion and $8.2 billion , respectively, of Chrysler Capital loans, which represented 31% and 37% , respectively, of the Company's auto RIC portfolio. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) ACL Rollforward by Portfolio Segment The activity in the ACL by portfolio segment for the three-month period ended March 31, 2018 and 2017 was as follows: Three-Month Period Ended March 31, 2018 (in thousands) Commercial Consumer Unallocated Total Allowance for loan and lease losses ("ALLL"), beginning of period $ 443,796 $ 3,420,756 $ 47,023 $ 3,911,575 Provision for loan and lease losses 41,232 480,548 — 521,780 Charge-offs (32,960 ) (1,218,936 ) — (1,251,896 ) Recoveries 10,006 661,744 — 671,750 Charge-offs, net of recoveries (22,954 ) (557,192 ) — (580,146 ) ALLL, end of period $ 462,074 $ 3,344,112 $ 47,023 $ 3,853,209 Reserve for unfunded lending commitments, beginning of period $ 108,805 $ 306 $ — $ 109,111 (Release of)/Provision for reserve for unfunded lending commitments (19,263 ) 17 — (19,246 ) Reserve for unfunded lending commitments, end of period 89,542 323 — 89,865 Total ACL, end of period $ 551,616 $ 3,344,435 $ 47,023 $ 3,943,074 Ending balance, individually evaluated for impairment (1) $ 94,993 $ 1,628,930 $ — $ 1,723,923 Ending balance, collectively evaluated for impairment 367,081 1,715,182 47,023 2,129,286 Financing receivables: Ending balance $ 38,400,180 $ 43,678,843 $ — $ 82,079,023 Ending balance, evaluated under the FVO or lower of cost or fair value 195,721 1,798,347 — 1,994,068 Ending balance, individually evaluated for impairment (1) 568,557 6,315,802 — 6,884,359 Ending balance, collectively evaluated for impairment 37,635,902 35,564,694 — 73,200,596 (1) Consists of loans in troubled debt restructuring ("TDR") status. Three-Month Period Ended March 31, 2017 (in thousands) Commercial Consumer Unallocated Total ALLL, beginning of period $ 449,835 $ 3,317,606 $ 47,023 $ 3,814,464 Provision for loan and lease losses 18,777 718,558 — 737,335 Charge-offs (26,173 ) (1,237,280 ) — (1,263,453 ) Recoveries 10,580 623,937 — 634,517 Charge-offs, net of recoveries (15,593 ) (613,343 ) — (628,936 ) ALLL, end of period $ 453,019 $ 3,422,821 $ 47,023 $ 3,922,863 Reserve for unfunded lending commitments, beginning of period $ 121,613 $ 806 $ — $ 122,419 (Release of) unfunded lending commitments (1,860 ) (30 ) — (1,890 ) Loss on unfunded lending commitments (133 ) — — (133 ) Reserve for unfunded lending commitments, end of period 119,620 776 — 120,396 Total ACL, end of period $ 572,639 $ 3,423,597 $ 47,023 $ 4,043,259 Ending balance, individually evaluated for impairment (1) $ 99,914 $ 1,518,545 $ — $ 1,618,459 Ending balance, collectively evaluated for impairment 353,105 1,904,276 47,023 2,304,404 Financing receivables: Ending balance $ 42,415,806 $ 43,402,053 $ — $ 85,817,859 Ending balance, evaluated under the FVO or lower of cost or fair value (1) 103,834 2,008,152 — 2,111,986 Ending balance, individually evaluated for impairment (1) 675,116 6,040,694 — 6,715,810 Ending balance, collectively evaluated for impairment 41,636,856 35,353,207 — 76,990,063 (1) Consists of loans in TDR status. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) The following table presents the activity in the allowance for loan losses for the RICs acquired in the Change in Control and those originated by SC subsequent to the Change in Control. Three-Month Period Ended March 31, 2018 (in thousands) Purchased Originated Total ALLL, beginning of period $ 384,167 $ 2,779,044 $ 3,163,211 (Release of) / Provision for loan and lease losses (15,830 ) 487,159 471,329 Charge-offs (105,510 ) (1,078,515 ) (1,184,025 ) Recoveries 59,899 594,952 654,851 Charge-offs, net of recoveries (45,611 ) (483,563 ) (529,174 ) ALLL, end of period $ 322,726 $ 2,782,640 $ 3,105,366 Three-Month Period Ended March 31, 2017 (in thousands) Purchased Originated Total ALLL, beginning of period $ 559,092 $ 2,538,127 $ 3,097,219 Provision for loan and lease losses 26,125 660,524 686,649 Charge-offs (188,686 ) (1,008,053 ) (1,196,739 ) Recoveries 98,690 517,286 615,976 Charge-offs, net of recoveries (89,996 ) (490,767 ) (580,763 ) ALLL, end of period $ 495,221 $ 2,707,884 $ 3,203,105 Refer to Note 16 for discussion of contingencies and possible losses related to the impact of hurricane activity in regions where the Company has lending activities. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Non-accrual loans by Class of Financing Receivable The recorded investment in non-accrual loans disaggregated by class of financing receivables and other non-performing assets is summarized as follows: (in thousands) March 31, 2018 December 31, 2017 Non-accrual loans: Commercial: CRE $ 132,941 $ 139,236 Commercial and industrial 203,738 230,481 Multifamily 10,569 11,348 Other commercial 79,474 83,468 Total commercial loans 426,722 464,533 Consumer: Residential mortgages 257,995 265,436 Home equity loans and lines of credit 131,036 134,162 RICs and auto loans - originated 1,644,605 1,816,226 RICs - purchased 207,328 256,617 Personal unsecured loans 2,820 2,366 Other consumer 11,118 10,657 Total consumer loans 2,254,902 2,485,464 Total non-accrual loans 2,681,624 2,949,997 Other real estate owned ("OREO") 126,714 130,777 Repossessed vehicles 171,359 210,692 Foreclosed and other repossessed assets 1,324 2,190 Total OREO and other repossessed assets 299,397 343,659 Total non-performing assets $ 2,981,021 $ 3,293,656 Age Analysis of Past Due Loans The servicing practices for RICs originated after January 1, 2017 changed such that there is an increase in the minimum payment requirements. While this change does impact the measurement of customer delinquencies, we concluded that it does not have a significant impact on the amount or timing of the recognition of credit losses and allowance for loan losses. For reporting of past due loans, a payment of 90% or more of the amount due is considered to meet the contractual requirements. For certain RICs originated prior to January 1, 2017, the Company considers 50% of a single payment due sufficient to qualify as a payment for past due classification purposes. For RICs originated after January 1, 2017, the required minimum payment is 90% of the scheduled payment, regardless of which origination channel through which the receivable was originated. The payment following the partial payment must be a full payment, or the account will move into delinquency status at that time. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) The age of recorded investments in past due loans and accruing loans 90 days or greater past due disaggregated by class of financing receivables is summarized as follows: As of: March 31, 2018 (in thousands) 30-89 90 Total Current Total (1) Recorded Investment Commercial: CRE $ 33,982 $ 74,069 $ 108,051 $ 8,964,478 $ 9,072,529 $ — Commercial and industrial (1) 90,510 82,703 173,213 13,735,081 13,908,294 — Multifamily 13,443 3,003 16,446 8,065,478 8,081,924 — Other commercial 48,961 3,180 52,141 7,285,292 7,337,433 — Consumer: Residential mortgages 189,872 191,010 380,882 8,994,194 9,375,076 15 Home equity loans and lines of credit 47,614 87,221 134,835 5,653,847 5,788,682 — RICs and auto loans - originated 2,634,364 228,811 2,863,175 21,340,720 24,203,895 — RICs and auto loans - purchased 330,226 24,139 354,365 1,160,721 1,515,086 — Personal unsecured loans 99,826 90,329 190,155 2,038,872 2,229,027 81,440 Other consumer 20,501 13,701 34,202 532,875 567,077 — Total $ 3,509,299 $ 798,166 $ 4,307,465 $ 77,771,558 $ 82,079,023 $ 81,455 (1) Commercial and industrial loans includes $195.7 million of LHFS at March 31, 2018 . (2) Residential mortgages includes $177.0 million of LHFS at March 31, 2018 . (3) RICs and auto loans includes $620.2 million of LHFS at March 31, 2018 . (4) Personal unsecured loans includes $967.8 million of LHFS at March 31, 2018 . As of December 31, 2017 (in thousands) 30-89 90 Total Current Total (1) Recorded Commercial: CRE $ 25,174 $ 100,524 $ 125,698 $ 9,153,527 $ 9,279,225 $ — Commercial and industrial 49,584 75,924 125,508 14,461,981 14,587,489 — Multifamily 3,562 2,990 6,552 8,267,883 8,274,435 — Other commercial 34,021 3,359 37,380 7,137,359 7,174,739 — Consumer: Residential mortgages 217,558 210,777 428,335 8,628,600 9,056,935 — Home equity loans and lines of credit 50,919 91,975 142,894 5,764,839 5,907,733 — RICs and auto loans - originated 3,405,721 327,045 3,732,766 20,449,706 24,182,472 — RICs and auto loans - purchased 452,235 40,516 492,751 1,342,117 1,834,868 — Personal unsecured loans 85,394 105,054 190,448 2,157,319 2,347,767 96,461 Other consumer 24,879 14,220 39,099 578,576 617,675 — Total $ 4,349,047 $ 972,384 $ 5,321,431 $ 77,941,907 $ 83,263,338 $ 96,461 (1) Commercial and industrial loans included $149.2 million of LHFS at December 31, 2017 . (2) Residential mortgages included $210.2 million of LHFS at December 31, 2017 , (3) RICs and auto loans included $1.1 billion of LHFS at December 31, 2017 . (4) Personal unsecured loans included $1.1 billion of LHFS at December 31, 2017 . NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Impaired Loans by Class of Financing Receivable Impaired loans are generally defined as all TDRs plus commercial non-accrual loans in excess of $1.0 million . Impaired loans disaggregated by class of financing receivables are summarized as follows: March 31, 2018 (in thousands) Recorded Investment (1) UPB Related Average With no related allowance recorded: Commercial: CRE $ 125,669 $ 151,164 $ — $ 126,039 Commercial and industrial 51,175 53,140 — 66,858 Multifamily 11,929 11,929 — 10,908 Other commercial 1,877 1,877 — 1,322 Consumer: Residential mortgages 147,333 198,200 — 127,327 Home equity loans and lines of credit 53,101 55,368 — 52,749 RICs and auto loans - originated 11 11 — 6 RICs and auto loans - purchased 13,252 17,010 — 14,722 Personal unsecured loans (2) 31,972 31,972 — 31,482 Other consumer 8,559 12,183 — 9,058 With an allowance recorded: Commercial: CRE 99,787 112,480 15,976 98,734 Commercial and industrial 184,297 185,115 55,322 180,533 Multifamily 4,791 4,791 19 5,496 Other commercial 73,696 73,696 23,676 75,704 Consumer: Residential mortgages 279,472 319,018 38,586 300,782 Home equity loans and lines of credit 64,004 76,156 5,078 64,416 RICs and auto loans - originated 4,736,587 4,787,816 1,281,642 4,762,443 RICs and auto loans - purchased 1,003,764 1,134,415 294,669 1,085,120 Personal unsecured loans 16,590 16,842 6,934 16,534 Other consumer 10,792 14,446 2,021 11,192 Total: Commercial $ 553,221 $ 594,192 $ 94,993 $ 565,594 Consumer 6,365,437 6,663,437 1,628,930 6,475,831 Total $ 6,918,658 $ 7,257,629 $ 1,723,923 $ 7,041,425 (1) Recorded investment includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts, as well as purchase accounting adjustments. (2) Includes LHFS. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) The Company recognized interest income, not including the impact of purchase accounting adjustments, of $261.2 million for the three-month period ended March 31, 2018 on approximately $5.8 billion of TDRs that were in performing status as of March 31, 2018 . December 31, 2017 (in thousands) Recorded Investment (1) UPB Related Average With no related allowance recorded: Commercial: CRE $ 126,406 $ 174,842 $ — $ 139,063 Commercial and industrial 82,541 96,324 — 75,338 Multifamily 9,887 10,838 — 10,129 Other commercial 767 911 — 903 Consumer: Residential mortgages 107,320 128,458 — 141,195 Home equity loans and lines of credit 52,397 54,421 — 50,635 RICs and auto loans - purchased 16,192 20,783 — 25,283 Personal unsecured loans (2) 30,992 30,992 — 28,500 Other consumer 9,557 13,055 — 14,446 With an allowance recorded: Commercial: CRE 97,680 117,730 18,523 118,492 Commercial and industrial 176,769 200,382 59,696 196,674 Multifamily 6,201 6,201 313 4,566 Other commercial 77,712 77,772 23,794 42,465 Consumer: Residential mortgages 322,092 392,833 40,963 303,361 Home equity loans and lines of credit 64,827 77,435 4,770 57,345 RICs and auto loans - originated 4,788,299 4,847,929 1,350,022 4,029,808 RICs and auto loans - purchased 1,166,476 1,318,306 347,663 1,511,212 Personal unsecured loans 16,477 16,661 6,259 16,668 Other consumer 11,592 15,290 2,151 12,343 Total: Commercial $ 577,963 $ 685,000 $ 102,326 $ 587,630 Consumer 6,586,221 6,916,163 1,751,828 6,190,796 Total $ 7,164,184 $ 7,601,163 $ 1,854,154 $ 6,778,426 (1) Recorded investment includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts, as well as purchase accounting adjustments. (2) Includes LHFS. The Company recognized interest income, not including the impact of purchase accounting adjustments, of $795.4 million for the year ended December 31, 2017 on approximately $5.8 billion of TDRs that were in performing status as of December 31, 2017 . Commercial Lending Asset Quality Indicators Commercial credit quality disaggregated by class of financing receivables is summarized according to standard regulatory classifications as follows: PASS. Asset is well-protected by the current net worth and paying capacity of the obligor or guarantors, if any, or by the fair value less costs to acquire and sell any underlying collateral in a timely manner. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) SPECIAL MENTION. Asset has potential weaknesses that deserve management’s close attention, which, if left uncorrected, may result in deterioration of the repayment prospects for an asset at some future date. Special mention assets are not adversely classified. SUBSTANDARD. Asset is inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. A well-defined weakness or weaknesses exist that jeopardize the liquidation of the debt. The loans are characterized by the distinct possibility that the Company will sustain some loss if deficiencies are not corrected. DOUBTFUL. Exhibits the inherent weaknesses of a substandard credit. Additional characteristics exist that make collection or liquidation in full highly questionable and improbable, on the basis of currently known facts, conditions and values. Possibility of loss is extremely high, but because of certain important and reasonable specific pending factors which may work to the advantage and strengthening of the credit, an estimated loss cannot yet be determined. LOSS. Credit is considered uncollectible and of such little value that it does not warrant consideration as an active asset. There may be some recovery or salvage value, but there is doubt as to whether, how much or when the recovery would occur. Commercial loan credit quality indicators by class of financing receivables are summarized as follows: March 31, 2018 CRE Commercial and industrial Multifamily Remaining Total (1) (in thousands) Rating: Pass $ 8,120,502 $ 12,576,220 $ 7,900,191 $ 7,212,830 $ 35,809,743 Special mention 617,232 831,097 135,106 43,314 1,626,749 Substandard 302,262 417,553 46,627 19,117 785,559 Doubtful 32,533 83,424 — 62,172 178,129 Total commercial loans $ 9,072,529 $ 13,908,294 $ 8,081,924 $ 7,337,433 $ 38,400,180 (1) Financing receivables include LHFS. December 31, 2017 CRE Commercial and industrial Multifamily Remaining Total (1) (in thousands) Rating: Pass $ 8,281,626 $ 13,176,248 $ 8,123,727 $ 7,059,627 $ 36,641,228 Special mention 645,835 941,683 105,225 29,657 1,722,400 Substandard 317,510 398,325 45,483 21,747 783,065 Doubtful 34,254 71,233 — 63,708 169,195 Total commercial loans $ 9,279,225 $ 14,587,489 $ 8,274,435 $ 7,174,739 $ 39,315,888 (1) Financing receivables include LHFS. Consumer Lending Asset Quality Indicators-Credit Score Consumer financing receivables for which either an internal or external credit score is a core component of the allowance model are summarized by credit score as follows: Credit Score Range (2) March 31, 2018 December 31, 2017 (dollars in thousands) RICs and auto loans (3) Percent RICs and auto loans (3) Percent No FICO ®(1) $ 4,016,803 15.6 % $ 4,530,238 17.4 % <600 13,532,536 52.7 % 13,395,203 51.4 % 600-639 4,410,604 17.1 % 4,332,278 16.7 % >=640 3,759,038 14.6 % 3,759,621 14.5 % Total $ 25,718,981 100.0 % $ 26,017,340 100.0 % (1) Consists primarily of loans for which credit scores are not considered in the ALLL model. (2) Credit scores updated quarterly. (3) RICs and auto loans include $620.2 million and $1.1 billion of LHFS at March 31, 2018 and December 31, 2017 , respectively, that do not have an allowance. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Consumer Lending Asset Quality Indicators-FICO and LTV Ratio For both residential and home equity loans, loss severity assumptions are incorporated in the loan and lease loss reserve models to estimate loan balances that will ultimately charge off. These assumptions are based on recent loss experience within various current LTV bands within these portfolios. LTVs are refreshed quarterly by applying Federal Housing Finance Agency Home price index changes at a state-by-state level to the last known appraised value of the property to estimate the current LTV. The Company's ALLL incorporates the refreshed LTV information to update the distribution of defaulted loans by LTV as well as the associated loss given default for each LTV band. Reappraisals on a recurring basis at the individual property level are not considered cost-effective or necessary; however, reappraisals are performed on certain higher risk accounts to support line management activities, default servicing decisions, or when other situations arise for which the Company believes the additional expense is warranted. Residential mortgage and home equity financing receivables by LTV and FICO range are summarized as follows: Residential Mortgages (1)(3) March 31, 2018 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 266,671 $ 6,616 $ 1,208 $ — $ — $ — $ — $ 274,495 <600 13 223,009 54,447 33,835 21,303 2,609 1,422 336,638 600-639 44 155,786 41,930 34,643 32,438 1,229 6,283 272,353 640-679 34 319,185 97,132 89,991 90,856 2,446 2,502 602,146 680-719 95 579,125 254,807 138,197 163,235 3,436 9,669 1,148,564 720-759 173 1,004,260 573,335 188,949 195,187 4,819 7,740 1,974,463 >=760 563 3,148,412 1,106,980 290,938 200,107 8,371 11,046 4,766,417 Grand Total $ 267,593 $ 5,436,393 $ 2,129,839 $ 776,553 $ 703,126 $ 22,910 $ 38,662 $ 9,375,076 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and combined LTV ("CLTV") for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) March 31, 2018 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 190,747 $ 1,393 $ 478 $ — $ — $ 192,618 <600 7,436 195,852 69,172 19,838 7,444 299,742 600-639 4,896 150,132 56,266 7,613 6,090 224,997 640-679 4,793 279,728 123,431 17,573 10,114 435,639 680-719 6,921 506,113 245,154 21,419 16,864 796,471 720-759 7,073 719,337 325,201 31,454 14,985 1,098,050 >=760 14,169 1,881,952 746,823 64,040 34,181 2,741,165 Grand Total $ 236,035 $ 3,734,507 $ 1,566,525 $ 161,937 $ 89,678 $ 5,788,682 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Residential Mortgages (1)(3) December 31, 2017 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 372,116 $ 6,759 $ 1,214 $ — $ — $ — $ — $ 380,089 <600 21 220,737 55,108 35,617 23,834 2,505 6,020 343,842 600-639 45 155,920 42,420 35,009 34,331 2,696 6,259 276,680 640-679 37 320,248 94,601 90,708 86,740 3,011 2,641 597,986 680-719 98 554,058 236,602 136,980 147,754 3,955 10,317 1,089,764 720-759 92 952,532 480,900 178,876 183,527 4,760 8,600 1,809,287 >=760 588 3,019,514 1,066,919 263,541 187,713 8,418 12,594 4,559,287 Grand Total $ 372,997 $ 5,229,768 $ 1,977,764 $ 740,731 $ 663,899 $ 25,345 $ 46,431 $ 9,056,935 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) December 31, 2017 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 154,690 $ 536 $ 238 $ — $ — $ 155,464 <600 8,064 190,657 64,554 16,634 22,954 302,863 600-639 6,276 158,461 61,250 9,236 9,102 244,325 640-679 6,745 297,003 127,347 19,465 14,058 464,618 680-719 8,875 500,234 258,284 24,675 20,261 812,329 720-759 8,587 724,831 332,508 30,526 19,119 1,115,571 >=760 17,499 1,917,373 768,905 73,573 35,213 2,812,563 Grand Total $ 210,736 $ 3,789,095 $ 1,613,086 $ 174,109 $ 120,707 $ 5,907,733 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. TDR Loans The following table summarizes the Company’s performing and non-performing TDRs at the dates indicated: (in thousands) March 31, 2018 December 31, 2017 Performing $ 5,811,401 $ 5,824,304 Non-performing 785,958 982,868 Total $ 6,597,359 $ 6,807,172 Commercial Loan TDRs All of the Company’s commercial loan modifications are based on the circumstances of the individual customer, including specific customers' complete relationships with the Company. Loan terms are modified to meet each borrower’s specific circumstances at a point in time and may allow for modifications such as term extensions and interest rate reductions. Modifications for commercial loan TDRs generally, although not always, result in bifurcation of the original loan into A and B notes. The A note is restructured to allow for upgraded risk rating and return to accrual status after a sustained period of payment performance has been achieved (typically six months for monthly payment schedules). The B note, if any, is structured as a deficiency note; the balance is charged off but the debt is usually not forgiven. Commercial TDRs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically six months for a monthly amortizing loan). TDRs are subject to analysis for specific reserves by either calculating the present value of expected future cash flows or, if collateral-dependent, calculating the fair value of the collateral less its estimated

OPERATING LEASE ASSETS, NET

OPERATING LEASE ASSETS, NET	3 Months Ended
	Mar. 31, 2018
Leases [Abstract]
OPERATING LEASE ASSETS, NET	OPERATING LEASE ASSETS, NET The Company has operating leases which are included in the Company's Condensed Consolidated Balance Sheets as Operating lease assets, net. The leased vehicle portfolio consists primarily of leases originated under the Chrysler Agreement. Operating lease assets, net consisted of the following as of March 31, 2018 and December 31, 2017 : (in thousands) March 31, 2018 December 31, 2017 Leased vehicles $ 14,777,384 $ 14,751,568 Origination fees and other costs 36,563 27,246 Manufacturer subvention payments (1,077,250 ) (1,047,113 ) Leased vehicles, gross 13,736,697 13,731,701 Less: accumulated depreciation (3,075,176 ) (3,333,125 ) Leased vehicles, net 10,661,521 10,398,576 Commercial equipment vehicles and aircraft, gross 131,316 93,981 Less: accumulated depreciation (21,941 ) (18,249 ) Commercial equipment vehicles and aircraft, net 109,375 75,732 Total operating lease assets, net $ 10,770,896 $ 10,474,308 The following summarizes the future minimum rental payments due to the Company as lessor under operating leases as of March 31, 2018 (in thousands): 2018 $ 1,393,256 2019 1,326,920 2020 647,034 2021 59,511 2022 6,754 Thereafter 16,370 Total $ 3,449,845 NOTE 5. OPERATING LEASE ASSETS, NET (continued) Lease income was $540.9 million and $496.0 million for the three-month periods ended March 31, 2018 and 2017 , respectively. During the three-month periods ended March 31, 2018 and 2017 , the Company recognized $53.2 million and $22.7 million , respectively, of net gains on the sale of operating lease assets that had been returned to the Company at the end of the lease term. These amounts are recorded within Miscellaneous income, net in the Company's Condensed Consolidated Statements of Operations . Lease expense was $424.3 million and $358.8 million for the three-month periods ended March 31, 2018 and 2017 , respectively.

VIEs

VIEs	3 Months Ended
	Mar. 31, 2018
Variable Interest Entity and Securitizations [Abstract]
VIEs	VIEs The Company transfers RICs and vehicle leases into newly formed Trusts that then issue one or more classes of notes payable backed by the collateral. The Company’s continuing involvement with these Trusts is in the form of servicing the assets and, generally, through holding residual interests in the Trusts. The Trusts are considered VIEs under GAAP, and the Company may or may not consolidate these VIEs on the Condensed Consolidated Financial Statements . For further description of the Company’s securitization activities, involvement with VIEs and accounting policies regarding consolidation of VIEs, see Note 7 of its Annual Report on Form 10-K for 2017. On-balance sheet VIEs The assets of consolidated VIEs that are included in the Company's Condensed Consolidated Financial Statements , presented reflecting the transfer of the underlying assets in order to reflect legal ownership, that can be used to settle obligations of the consolidated VIEs and the liabilities of these consolidated entities for which creditors (or beneficial interest holders) do not have recourse to our general credit were as follows: (in thousands) March 31, 2018 December 31, 2017 Assets Restricted cash $ 2,380,619 $ 1,995,557 Loans (1)(2) 22,121,392 22,712,864 Operating lease assets, net 10,612,824 10,160,327 Various other assets 810,497 733,123 Total Assets $ 35,925,332 $ 35,601,871 Liabilities Notes payable (2) $ 28,634,362 $ 28,469,999 Various other liabilities 193,133 197,969 Total Liabilities $ 28,827,495 $ 28,667,968 (1) Includes $453.0 million and $1.1 billion of RICs HFS at March 31, 2018 and December 31, 2017 , respectively. (2) Reflects the impacts of purchase accounting. Certain amounts shown above are greater than the amounts shown in the corresponding line items in the accompanying Condensed Consolidated Balance Sheets due to intercompany eliminations between the VIEs and other entities consolidated by the Company. The amounts shown above are also impacted by purchase accounting marks from the Change in Control. For example, for most of its securitizations, the Company retains one or more of the lowest tranches of bonds. Rather than showing investment in bonds as an asset and the associated debt as a liability, these amounts are eliminated in consolidation as required by GAAP. The Company retains servicing responsibility for receivables transferred to the Trusts and receives a monthly servicing fee on the outstanding principal balance. Supplemental fees, such as late charges, for servicing the receivables are reflected in Miscellaneous income. As of March 31, 2018 and December 31, 2017 , the Company was servicing $25.4 billion and $26.1 billion , respectively, of RICs that have been transferred to consolidated Trusts. The remainder of the Company’s RICs remains unpledged. NOTE 6. VIEs (continued) Below is a summary of the cash flows received from the on-balance sheet Trusts for the periods indicated: Three-Month Period Ended March 31, (in thousands) 2018 2017 Assets securitized $ 7,240,944 $ 7,646,625 Net proceeds from new securitizations (1) $ 3,476,322 $ 5,576,801 Net proceeds from sale of retained bonds 211,610 115,970 Cash received for servicing fees (2) 215,790 208,923 Net distributions from Trusts (2) 545,152 678,229 Total cash received from Trusts $ 4,448,874 $ 6,579,923 (1) Includes additional advances on existing securitizations. (2) These amounts are not reflected in the accompanying Condensed Consolidated SCF because the cash flows are between the VIEs and other entities included in the consolidation. Off-balance sheet VIEs During the three-month periods ended March 31, 2018 and 2017 , the Company sold $1.5 billion and $700.0 million of gross RICs to VIEs in off-balance sheet securitizations for a loss of $16.9 million and $2.7 million , respectively. The transactions were executed under securitization platforms with Santander. Santander holds eligible vertical interests in notes and certificates of not less than 5% to comply with the DFA's risk retention rules. As of March 31, 2018 and December 31, 2017 , the Company was servicing $4.4 billion and $3.4 billion , respectively, of gross RICs that have been sold in off-balance sheet securitizations and were subject to an optional clean-up call. The portfolio was comprised as follows: (in thousands) March 31, 2018 December 31, 2017 SPAIN $ 3,176,238 $ 2,024,016 Total serviced for related parties 3,176,238 2,024,016 Chrysler Capital securitizations 1,182,457 1,404,232 Total serviced for third parties 1,182,457 1,404,232 Total serviced for other portfolio $ 4,358,695 $ 3,428,248 Other than repurchases of sold assets due to standard representations and warranties, the Company has no exposure to loss as a result of its involvement with these VIEs. A summary of the cash flows received from the off-balance sheet Trusts for the periods indicated is as follows: Three-Month Period Ended March 31, (in thousands) 2018 2017 Assets securitized (1) $ 1,475,253 $ 700,022 Net proceeds from new securitizations $ 1,474,820 $ 702,319 Cash received for servicing fees 8,078 1,398 Total cash received from Trusts $ 1,482,898 $ 703,717 (1) Represents the UPB at the time of original securitization.

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
GOODWILL AND OTHER INTANGIBLES	GOODWILL AND OTHER INTANGIBLES Goodwill The following table presents the Company's goodwill by its reporting units at March 31, 2018 : (in thousands) Consumer and Business Banking Commercial Banking GCB SC Total Goodwill at March 31, 2018 $ 1,880,304 $ 1,412,995 $ 131,130 $ 1,019,960 $ 4,444,389 During the first quarter of 2018, the reportable segments (and reporting units) formerly known as Commercial Banking and CRE were combined and presented as Commercial Banking. Refer to Note 18 for further discussion on the change in reportable segments. There were no additions or removals of underlying lines of business in connection with this reporting change. As a result, goodwill assigned to these former reporting units of $542.6 million and $870.4 million , for Commercial Banking and CRE, respectively, have been combined. There were no additions or impairments of goodwill for the three-month period ended March 31, 2018 . There were no additions, impairments, or re-allocations of goodwill for the three-month period ended March 31, 2017 . The Company conducted its last annual goodwill impairment tests as of October 1, 2017 using generally accepted valuation methods. After conducting an analysis of the fair value of each reporting unit as of October 1, 2017 , the Company determined that the full amount of goodwill attributed to Santander BanCorp of $10.5 million was impaired and, as a result, it was written-off, primarily due to the unfavorable economic environment in Puerto Rico and the additional adverse effects of Hurricane Maria. No impairments of goodwill attributed to other reporting units were identified. Other Intangible Assets The following table details amounts related to the Company's intangible assets subject to amortization for the dates indicated. March 31, 2018 December 31, 2017 (in thousands) Net Carrying Amount Accumulated Amortization Net Carrying Amount Accumulated Amortization Intangibles subject to amortization: Dealer networks $ 416,607 $ (163,393 ) $ 426,411 $ (153,589 ) Chrysler relationship 76,250 (62,500 ) 80,000 (58,750 ) Trade name 15,600 (2,400 ) 15,900 (2,100 ) Other intangibles 12,011 (57,311 ) 13,442 (56,021 ) Total intangibles subject to amortization $ 520,468 $ (285,604 ) $ 535,753 $ (270,460 ) At March 31, 2018 and December 31, 2017 , the Company did no t have any intangibles, other than goodwill, that were not subject to amortization. Amortization expense on intangible assets was $15.3 million and $15.5 million for the three-month periods ended March 31, 2018 and March 31, 2017 , respectively. The estimated aggregate amortization expense related to intangibles, excluding any impairment charges, for each of the five succeeding calendar years ending December 31 is: Year Calendar Year Amount Recorded To Date Remaining Amount To Record (in thousands) 2018 $ 60,644 $ 15,288 $ 45,356 2019 58,975 — 58,975 2020 58,642 — 58,642 2021 39,889 — 39,889 2022 39,889 — 39,889 Thereafter 277,717 — 277,717

OTHER ASSETS

OTHER ASSETS	3 Months Ended
	Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
OTHER ASSETS	OTHER ASSETS The following is a detail of items that comprise other assets at March 31, 2018 and December 31, 2017 : (in thousands) March 31, 2018 December 31, 2017 Income tax receivables $ 293,072 $ 292,220 Derivative assets at fair value 581,076 448,977 Other repossessed assets 172,683 212,882 MSRs 163,148 149,197 Prepaid expenses 178,920 172,547 OREO 126,714 130,777 Deferred tax asset, net 799,423 771,652 Accrued interest receivable 496,144 563,607 Equity method investments 198,923 194,434 Miscellaneous assets and receivables 984,645 696,134 Total other assets $ 3,994,748 $ 3,632,427 Income tax receivables Income tax receivables consists primarily of accrued federal tax receivables. Derivative assets at fair value Derivative assets at fair value represent the net amount of derivatives presented in the Condensed Consolidated Financial Statements , including the impact of amounts offsetting recognized assets. Refer to the offsetting of financial assets table in Note 12 to these Condensed Consolidated Financial Statements for the detail of these amounts. MSRs The Company maintains an MSR asset for sold residential real estate loans serviced for others. At March 31, 2018 and December 31, 2017 , the balance of these loans serviced for others accounted for at fair value was $14.8 billion and $14.9 billion , respectively. The Company accounts for a majority of its residential MSRs using the FVO. Changes in fair value are recorded through the Miscellaneous Income, net on the Condensed Consolidated Statements of Operations . The fair value of the MSRs at March 31, 2018 and December 31, 2017 were $160.1 million and $146.0 million , respectively. See further discussion on the valuation of the MSRs in Note 14 . As deemed appropriate, the Company economically hedges MSRs using interest rate swaps and forward contracts to purchase MBS. See further discussion on these derivative activities in Note 12 to these Condensed Consolidated Financial Statements . The remainder of MSRs not accounted for using the FVO are accounted for at lower of cost or market. For the three-month period ended March 31, 2018 and March 31, 2017 , the Company recorded net changes in the fair value of MSRs due to valuation totaling $15.0 million and $1.5 million , respectively. The following table presents a summary of activity for the Company's residential MSRs that are included in the Condensed Consolidated Balance Sheets . Three-Month Period Ended (in thousands) March 31, 2018 March 31, 2017 Fair value at beginning of period (1) $ 145,993 $ 146,589 Mortgage servicing assets recognized 2,755 5,730 Principal reductions (3,661 ) (4,321 ) Change in fair value due to valuation assumptions 15,043 1,457 Fair value at end of period (1) $ 160,130 $ 149,455 (1) The Company had total MSRs of $163.1 million and $149.2 million as of March 31, 2018 and December 31, 2017 , respectively. The Company has elected to account for the majority of its MSR balance using the FVO, while the remainder of the MSRs are accounted for using the lower of cost or market and are not presented within this table. NOTE 8. OTHER ASSETS (continued) Fee income and gain on sale of mortgage loans Included in Miscellaneous Income, net on the Condensed Consolidated Statements of Operations was mortgage servicing fee income of $10.2 million and $10.6 million for the three-month periods ended March 31, 2018 and 2017 , respectively. The Company had gains on sales of mortgage loans included in Miscellaneous Income, net on the Condensed Consolidated Statements of Operations of $6.2 million and $4.4 million for the three-month periods ended March 31, 2018 and 2017 , respectively. Other repossessed assets and OREO Other repossessed assets primarily consist of leased assets that have been terminated and are included as grounded inventory, which is obtained through repossession. OREO consists primarily of the Company's foreclosed properties. Deferred tax assets, net The Company recorded $799.4 million of deferred tax assets, net as of March 31, 2018 , compared to $771.7 million at December 31, 2017 . Equity method investments The Company makes certain equity investments in various limited partnerships, some of which are considered VIEs, that invest in and lend to qualified community development entities, such as renewable energy investments, through the New Market Tax Credits ("NMTC") and CRA programs. The Company acts only in a limited partner capacity in connection with these partnerships, so the Company has determined that it is not the primary beneficiary of the partnerships because it does not have the power to direct the activities of the partnerships that most significantly impact the partnerships' economic performance. Miscellaneous assets and receivables Miscellaneous assets and receivables includes subvention receivables in connection with the Chrysler Agreement, investment and capital market receivables, derivatives trading receivables and unapplied payments. The first quarter increase is due to increases in subvention receivables and due from others, primarily at SIS, offset by decreases in investment receivables and wire transfer clearing.

DEPOSITS AND OTHER CUSTOMER ACC

DEPOSITS AND OTHER CUSTOMER ACCOUNTS	3 Months Ended
	Mar. 31, 2018
Deposits [Abstract]
DEPOSITS AND OTHER CUSTOMER ACCOUNTS	DEPOSITS AND OTHER CUSTOMER ACCOUNTS Deposits and other customer accounts are summarized as follows: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Percent of total deposits Balance Percent of total deposits Interest-bearing demand deposits $ 8,246,120 13.3 % $ 8,784,597 14.4 % Non-interest-bearing demand deposits 15,603,797 25.2 % 15,402,235 25.3 % Savings 6,123,217 9.9 % 5,903,897 9.7 % Customer repurchase accounts 577,161 1.0 % 802,119 1.4 % Money market 25,726,743 41.6 % 24,530,661 40.3 % CDs 5,564,137 9.0 % 5,407,594 8.9 % Total Deposits (1) $ 61,841,175 100.0 % $ 60,831,103 100.0 % (1) Includes foreign deposits, as defined by the FRB, of $9.0 billion and $9.1 billion at March 31, 2018 and December 31, 2017 , respectively. Deposits collateralized by investment securities, loans, and other financial instruments totaled $2.1 billion and $2.3 billion at March 31, 2018 and December 31, 2017 , respectively. Demand deposit overdrafts that have been reclassified as loan balances were $155.7 million and $38.9 million at March 31, 2018 and December 31, 2017 , respectively. At March 31, 2018 and December 31, 2017 , the Company had $1.4 billion and $1.3 billion of CDs greater than $250 thousand.

BORROWINGS

BORROWINGS	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
BORROWINGS	BORROWINGS Total borrowings and other debt obligations at March 31, 2018 were $38.4 billion , compared to $39.0 billion at December 31, 2017 . The Company's debt agreements impose certain limitations on dividends other payments and transactions. The Company is currently in compliance with these limitations. Periodically, as part of the Company's wholesale funding management, it opportunistically repurchases outstanding borrowings in the open market and subsequently retires the obligations. Bank The Bank had no new securities issuances and did no t repurchase any outstanding borrowings in the open market during the three-month period ended March 31, 2018 . SHUSA During the first quarter of 2018, the Company repurchased $63.2 million of its 3.45% senior notes due 2018 and $336.8 million of its 2.70% senior notes due 2019. The Company recorded loss on debt extinguishment related to debt repurchases and early repayments at SHUSA and the Bank of $2.2 million in total for the three-month period ended March 31, 2018 , compared to $6.7 million for the three-month period ended March 31, 2017 . Parent Company and other IHC Entities Borrowings and Debt Obligations The following table presents information regarding the Parent Company and its subsidiaries' borrowings and other debt obligations at the dates indicated: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Effective Rate Balance Effective Rate Parent Company 3.45% senior notes, due August 2018 $ 181,227 3.62 % $ 244,317 3.62 % 2.70% senior notes, due May 2019 662,337 2.82 % 998,349 2.82 % 2.65% senior notes, due April 2020 996,636 2.82 % 996,238 2.82 % 3.70% senior notes, due March 2022 1,445,928 3.74 % 1,440,044 3.74 % 3.40% senior notes, due January 2023 993,950 3.54 % 993,662 3.54 % 4.50% senior notes, due July 2025 1,095,576 4.56 % 1,095,449 4.56 % 4.40% senior notes, due July 2027 1,049,790 4.40 % 1,049,787 4.40 % Junior subordinated debentures - Sovereign Capital Trust IX, due July 2036 149,469 3.38 % 149,462 3.14 % Common securities - Sovereign Capital Trust IX 4,640 3.38 % 4,640 3.14 % Senior notes, due July 2019 (1) 388,592 2.69 % 388,565 2.31 % Senior notes, due September 2019 (1) 370,783 2.70 % 370,754 2.34 % Senior notes, due January 2020 (1) 302,512 2.71 % 302,494 2.40 % Senior notes, due September 2020 (2) 114,370 3.16 % 115,804 3.32 % Subsidiaries 2.00% subordinated debt, maturing through 2042 40,934 2.00 % 40,842 2.00 % Short-term borrowings, due within one year, due April 2018 93,806 1.70 % 24,000 1.38 % Total due to others overnight, due within one year, due April 2018 18,600 1.70 % 10,000 1.38 % Short-term borrowings, due within one year, due April 2018 20,421 0.25 % 37,546 0.25 % Short-term borrowings, due within one year, maturing through 2018 — — % 7,123 0.83 % Total Parent Company and subsidiaries' borrowings and other debt obligations $ 7,929,571 3.52 % $ 8,269,076 3.45 % (1) These notes bear interest at a rate equal to the three-month London Interbank Offered Rate ("LIBOR") plus 100 basis points per annum. (2) These notes will bear interest at a rate equal to the three-month LIBOR plus 105 basis points per annum. NOTE 10. BORROWINGS (continued) Bank Borrowings and Debt Obligations The following table presents information regarding the Bank's borrowings and other debt obligations at the dates indicated: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Effective Rate Balance Effective Rate 8.750% subordinated debentures, due May 2018 $ 192,098 8.92 % $ 192,019 8.92 % Subordinated term loan, due February 2019 104,740 7.63 % 111,883 7.12 % FHLB advances, maturing through July 2019 1,500,000 1.91 % 1,950,000 1.53 % Securities sold under repurchase agreements 150,000 1.90 % 150,000 1.56 % Real estate investment trust preferred, due May 2020 144,522 13.24 % 144,167 13.35 % Subordinated term loan, due August 2022 28,001 9.29 % 27,911 8.89 % Total Bank borrowings and other debt obligations $ 2,119,361 3.70 % $ 2,575,980 3.07 % The Bank had outstanding irrevocable letters of credit totaling $485.8 million from the FHLB of Pittsburgh at March 31, 2018 , used to secure uninsured deposits placed with the Bank by state and local governments and their political subdivisions. Revolving Credit Facilities The following tables present information regarding SC's credit facilities as of March 31, 2018 and December 31, 2017 : March 31, 2018 (dollars in thousands) Balance Committed Amount Effective Rate Assets Pledged Restricted Cash Pledged Warehouse line, maturing on various dates (1) $ 603,145 $ 1,250,000 2.71 % $ 865,991 $ 24,063 Warehouse line, due November 2019 358,220 500,000 2.06 % 421,622 21,337 Warehouse line, due August 2019 (2) 2,105,842 3,900,000 3.42 % 3,108,422 68,631 Warehouse line, due October 2019 611,477 1,800,000 3.43 % 839,499 14,727 Warehouse line, due October 2019 148,565 400,000 3.65 % 206,287 4,070 Warehouse line, due August 2019 (3) 229,984 500,000 3.74 % 348,645 19,915 Warehouse line, due November 2019 297,699 1,000,000 3.63 % 420,623 11,557 Warehouse line, due October 2018 229,800 300,000 3.37 % 268,054 10,719 Warehouse line, due December 2018 — 300,000 — % — — Repurchase facility, maturing on various dates (4)(5) 291,949 291,949 3.49 % 407,299 12,962 Repurchase facility, due April 2018 (5)(7) 196,727 196,727 3.06 % 257,054 — Repurchase facility, due June 2018 (5) 153,177 153,177 3.80 % 222,108 — Repurchase facility, due December 2018 (4) 67,773 67,773 3.55 % 156,202 — Line of credit with related party, due December 2018 (6) 30,000 1,000,000 3.09 % 30,000 — Line of credit with related party, due December 2018 (6) 114,200 750,000 4.34 % 126,392 2,376 Total SC revolving credit facilities $ 5,438,558 $ 12,409,626 3.30 % $ 7,678,198 $ 190,357 (1) As of March 31, 2018 , half of the outstanding balance on this facility matures in March 2019 and the remaining balance matures in March 2020. (2) This line is held exclusively for financing of Chrysler Capital leases. (3) On February 14, 2018 , the maturity of this warehouse line was extended from January 2018 to August 2019. (4) The maturity of this repurchase facility ranges from April 2018 to July 2018. (5) These repurchase facilities are collateralized by securitization notes payable retained by SC. No portion of these facilities is unsecured. These facilities have rolling maturities of up to one year . As the borrower, SC is exposed to liquidity risk due to changes in the market value of retrained securities pledged. In some instances, SC places or receives cash collateral with counteparties under collateral arrangements associated with SC's repurchase agreements. (6) These lines are also collateralized by securitization notes payable and residuals retained by SC. As of March 31, 2018 , no portion of these facilities was unsecured. (7) Half of this repurchase facility was settled on maturity in April 2018 and remaining balance of this repurchase facility was extended to July 2018. NOTE 10. BORROWINGS (continued) December 31, 2017 (dollars in thousands) Balance Committed Amount Effective Assets Pledged Restricted Cash Pledged Warehouse line, maturing on various dates (1) $ 339,145 $ 1,250,000 2.53 % $ 461,353 $ 12,645 Warehouse line, due November 2019 435,220 500,000 1.92 % 521,365 16,866 Warehouse line, due August 2019 (2) 2,044,843 3,900,000 2.96 % 2,929,890 53,639 Warehouse line, due October 2019 226,577 1,800,000 4.95 % 311,336 6,772 Warehouse line, due October 2019 81,865 400,000 4.09 % 114,021 3,057 Warehouse line, due January 2018 (3) 336,484 500,000 2.87 % 473,208 — Warehouse line, due November 2019 403,999 1,000,000 2.66 % 546,782 14,729 Warehouse line, due October 2018 235,700 300,000 2.84 % 289,634 10,474 Warehouse line, due December 2018 — 300,000 1.49 % — — Repurchase facility, maturing on various dates (4)(5) 325,775 325,775 3.24 % 474,188 13,842 Repurchase facility, due April 2018 (5) 202,311 202,311 2.67 % 264,120 — Repurchase facility, due March 2018 (5) 147,500 147,500 3.91 % 222,108 — Repurchase facility, due March 2018 (5) 68,897 68,897 3.04 % 95,762 — Line of credit with related party, due December 2018 (6) — 1,000,000 3.09 % — — Line of credit with related party, due December 2018 (6) 750,000 750,000 1.33 % — — Total SC revolving credit facilities $ 5,598,316 $ 12,444,483 2.73 % $ 6,703,767 $ 132,024 (1) As of December 31, 2017 , half of the outstanding balance on this facility will mature in March 2019 and half will mature in March 2020. (2) This line is held exclusively for financing of Chrysler Capital leases. (3) On February 14, 2018, the maturity of this warehouse line was extended to August 2019. (4) The maturity of this repurchase facility ranges from February 2018 to July 2018. (5) These repurchase facilities are collateralized by securitization notes payable retained by SC. No portion of these facilities are unsecured. These facilities have rolling maturities of up to one year . As the borrower, SC is exposed to liquidity risk due to changes in the market value of retrained securities pledged. In some instances, SC places or receives cash collateral with counteparties under collateral arrangements associated with SC's repurchase agreements. (6) These lines are also collateralized by securitization notes payable and residuals retained by SC. As of December 31, 2017 , no portion of these facilities was unsecured. Secured Structured Financings The following tables present information regarding SC's secured structured financings as of March 31, 2018 and December 31, 2017 : March 31, 2018 (dollars in thousands) Balance Initial Note Amounts Issued Initial Weighted Average Interest Rate Range Collateral Restricted Cash SC public securitizations, maturing on various dates (1)(2) $ 15,943,321 $ 37,984,872 1.16% - 2.80% $ 20,910,432 $ 1,629,738 SC privately issued amortizing notes, maturing on various dates (1) 6,919,434 12,632,368 0.88% - 2.86% 8,522,690 573,486 Total SC secured structured financings $ 22,862,755 $ 50,617,240 0.88% - 2.86% $ 29,433,122 $ 2,203,224 (1) SC has entered into various securitization transactions involving its retail automobile installment loans and leases. These transactions are accounted for as secured financings and therefore both the securitized RICs and the related securitization debt issued by SPEs remain on the Condensed Consolidated Balance Sheets . The maturity of this debt is based on the timing of repayments from the securitized assets. (2) Securitizations executed under Rule 144A of the Securities Act are included within this balance. NOTE 10. BORROWINGS (continued) December 31, 2017 (dollars in thousands) Balance Initial Note Amounts Issued Initial Weighted Average Interest Rate Range Collateral Restricted Cash SC public securitizations, maturing on various dates (1)(2) $ 14,995,304 $ 36,800,642 0.89% - 2.80% $ 19,873,621 $ 1,470,459 SC privately issued amortizing notes, maturing on various dates (1) 7,564,637 12,278,282 0.88% - 4.09% 9,232,658 377,300 Total SC secured structured financings $ 22,559,941 $ 49,078,924 0.88% - 4.09% $ 29,106,279 $ 1,847,759 (1) SC has entered into various securitization transactions involving its retail automobile installment loans and leases. These transactions are accounted for as secured financings and therefore both the securitized RICs and the related securitization debt issued by SPEs remain on the Condensed Consolidated Balance Sheets . The maturity of this debt is based on the timing of repayments from the securitized assets. (2) Securitizations executed under Rule 144A of the Securities Act of 1933 (the “Securities Act”) are included within this balance. Most of SC's secured structured financings are in the form of public, SEC-registered securitizations. SC also executes private securitizations under Rule 144A of the Securities Act, and periodically issues private term amortizing notes, which are structured similarly to securitizations but are acquired by banks and conduits. SC's securitizations and private issuances are collateralized by RICs or vehicle leases. As of March 31, 2018 and December 31, 2017 , SC had private issuances of notes backed by vehicle leases totaling $4.6 billion and $3.7 billion . respectively.

ACCUMULATED OTHER COMPREHENSIVE

ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS)	ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) The following table presents the components of accumulated other comprehensive income/(loss), net of related tax, for the three-month period ended March 31, 2018 and 2017 , respectively. Total Other Total Accumulated Three-Month Period Ended March 31, 2018 December 31, 2017 March 31, 2018 (in thousands) Pretax Tax Net Activity Beginning Net Ending Change in accumulated other comprehensive income on cash flow hedge derivative financial instruments $ (11,462 ) $ (4,671 ) $ (16,133 ) Reclassification adjustment for net (gains) on cash flow hedge derivative financial instruments (1) (1,687 ) 455 (1,232 ) Net unrealized (losses) on cash flow hedge derivative financial instruments (13,149 ) (4,216 ) (17,365 ) $ (6,388 ) $ (17,365 ) $ (23,753 ) Change in unrealized (losses) on investments in debt securities AFS (122,244 ) 10,710 (111,534 ) Reclassification adjustment for net losses included in net income/(expense) on non-OTTI securities (2) 663 (58 ) 605 Net unrealized (losses) on investments in debt securities AFS (121,581 ) 10,652 (110,929 ) (140,498 ) (110,929 ) Cumulative effect of adoption of new ASUs (4) (39,094 ) Net unrealized (losses) on investments in debt securities AFS - upon adoption (150,023 ) (290,521 ) Pension and post-retirement actuarial (loss) (3) 842 (5,304 ) (4,462 ) (51,545 ) (4,462 ) (56,007 ) As of March 31, 2018 $ (133,888 ) $ 1,132 $ (132,756 ) $ (198,431 ) $ (171,850 ) $ (370,281 ) (1) Net (losses)/gains reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statements of Operations for settlements of interest rate swap contracts designated as cash flow hedges. (2) Net (gains)/losses reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statements of Operations for the sale of AFS securities. (3) Included in the computation of net periodic pension costs. (4) Includes impact of other comprehensive income reclassified to Retained earnings as a result of the adoption of ASU 2018-02. Refer to Note 1 for further discussion. NOTE 11. ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (continued) Total Other Total Accumulated Three-Month Period Ended March 31, 2017 December 31, 2016 March 31, 2017 (in thousands) Pretax Tax Net Activity Beginning Net Ending Change in accumulated other comprehensive income on cash flow hedge derivative financial instruments $ (2,828 ) $ (1,269 ) $ (4,097 ) Reclassification adjustment for net losses on cash flow hedge derivative financial instruments (1) 2,387 (777 ) 1,610 Net unrealized (losses) on cash flow hedge derivative financial instruments (441 ) (2,046 ) (2,487 ) $ (6,725 ) $ (2,487 ) $ (9,212 ) Change in unrealized gains on investment securities AFS 31,479 (10,510 ) 20,969 Reclassification adjustment for net (gains) included in net income/(expense) on non-OTTI securities (2) — — — Reclassification adjustment for net losses included in net income/(expense) on OTTI securities (3) — — — Reclassification adjustment for net (gains) included in net income — — — Net unrealized gains on investment securities AFS 31,479 (10,510 ) 20,969 (130,754 ) 20,969 (109,785 ) Pension and post-retirement actuarial gain (4) 913 (428 ) 485 (55,729 ) 485 (55,244 ) As of March 31, 2017 $ 31,951 $ (12,984 ) $ 18,967 $ (193,208 ) $ 18,967 $ (174,241 ) (1) Net gains/(losses) reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statements of Operations for settlements of interest rate swap contracts designated as cash flow hedges. (2) Net (gains)/losses reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statements of Operations for the sale of AFS securities. (3) Unrealized losses/(gains) previously recognized in accumulated other comprehensive income on securities for which OTTI was recognized during the period. See further discussion in Note 3 to the Condensed Consolidated Financial Statements . (4) Included in the computation of net periodic pension costs.

DERIVATIVES

DERIVATIVES	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES	DERIVATIVES General The Company uses derivative financial instruments primarily to help manage exposure to interest rate, foreign exchange, equity and credit risk, as well as to reduce the effects that changes in interest rates may have on net income, the fair value of assets and liabilities, and cash flows. The Company also enters into derivatives with customers to facilitate their risk management activities, and often provides commercial loan customers the option to purchase derivative products to hedge interest rate risk associated with loans made by the Bank. The Company uses derivative financial instruments as risk management tools and not for speculative trading purposes. The fair value of all derivative balances is recorded within Other assets and Other liabilities on the Condensed Consolidated Balance Sheet . See Note 14 for discussion of the valuation methodology for derivative instruments. NOTE 12. DERIVATIVES (continued) Derivatives represent contracts between parties that usually require little or no initial net investment and result in one party delivering cash or another type of asset to the other party based on a notional amount and an underlying asset, index, interest rate or future purchase commitment or option as specified in the contract. Derivative transactions are often measured in terms of notional amount, but this amount is generally not exchanged, is not recorded on the balance sheet, and does not represent the Company`s exposure to credit loss. The notional amount is the basis on which the financial obligation of each party to the contract is calculated to determine required payments under the derivative contract. The Company controls the credit risk of its derivative contracts through credit approvals, limits and monitoring procedures. The underlying asset is typically a referenced interest rate (commonly the Overnight Indexed Swap ("OIS") rate or LIBOR), security, credit spread or index. The Company’s capital markets and mortgage banking activities are subject to price risk. The Company employs various tools to measure and manage price risk in its portfolios. In addition, the Board of Directors has established certain limits relative to positions and activities. The level of price risk exposure at any given time depends on the market environment and expectations of future price and market movements and will vary from period to period. Credit Risk Contingent Features The Company has entered into certain derivative contracts that require the posting of collateral to counterparties when those contracts are in a net liability position. The amount of collateral to be posted is based on the amount of the net liability and thresholds generally related to the Company's long-term senior unsecured credit ratings. In a limited number of instances, counterparties also have the right to terminate their International Swaps and Derivatives Association, Inc. ("ISDA") master agreements if the Company's ratings fall below a specified level, typically investment grade. As of March 31, 2018 , derivatives in this category had a fair value of $1.7 million . The credit ratings of the Company and the Bank are currently considered investment grade. During the first quarter of 2018 , no additional collateral would be required if there were a further 1 - or 2 - notch downgrade by either Standard & Poor's ("S&P") or Moody's Investor Services ("Moody's"). As of March 31, 2018 and December 31, 2017 , the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting or termination provisions based on the Company's ratings) that were in a net liability position totaled $7.3 million and $10.4 million , respectively. The Company had $10.7 million and $15.7 million in cash and securities collateral posted to cover those positions as of March 31, 2018 and December 31, 2017 , respectively. Hedge Accounting Management uses derivative instruments designated as hedges to mitigate the impact of interest rate and foreign exchange rate movements on the fair value of certain assets and liabilities and on highly probable forecasted cash flows. These instruments primarily include interest rate swaps that have underlying interest rates based on key benchmark indices. The nature and volume of the derivative instruments used to manage interest rate risk depend on the level and type of assets and liabilities on the balance sheet and the risk management strategies for the current and anticipated interest rate environment. Interest rate swaps are generally used to convert fixed-rate assets and liabilities to variable rate assets and liabilities and vice versa. The Company utilizes interest rate swaps that have a high degree of correlation to the related financial instrument. Cash Flow Hedges The Company has outstanding interest rate swap agreements designed to hedge a portion of the Company’s floating rate assets, and liabilities (including its borrowed funds). All of these swaps have been deemed as highly effective cash flow hedges. The gain or loss on the derivative instrument is reported as a component of accumulated other comprehensive income and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings and is presented in the same Consolidated Statements of Operations line item as the earnings effect of the hedged item. The last of the hedges is scheduled to expire in December 2030 . The Company includes all components of each derivative's gain or loss in the assessment of hedge effectiveness. As of March 31, 2018 , the Company expected $34.7 million of gains/losses recorded in accumulated other comprehensive loss to be reclassified to earnings during the subsequent twelve months as the future cash flows occur. NOTE 12. DERIVATIVES (continued) Derivatives Designated in Hedge Relationships – Notional and Fair Values Derivatives designated as accounting hedges at March 31, 2018 and December 31, 2017 included: (dollars in thousands) Notional Amount Asset Liability Weighted Average Receive Rate Weighted Average Pay Rate Weighted Average Life (Years) March 31, 2018 Cash flow hedges: Pay fixed — receive variable interest rate swaps $ 4,931,593 $ 71,974 $ 2,346 0.07 % 0.15 % 1.92 Pay variable - receive fixed interest rate swaps 4,000,000 — 117,398 1.41 % 1.73 % 2.78 Interest rate floor 1,400,000 3,819 — 0.05 % — % 2.37 Total $ 10,331,593 $ 75,793 $ 119,744 0.58 % 0.74 % 2.31 December 31, 2017 Cash flow hedges: Pay fixed — receive variable interest rate swaps $ 5,183,511 $ 46,422 $ 4,458 0.05 % 0.14 % 2.12 Pay variable - receive fixed interest rate swaps 4,000,000 — 80,453 1.41 % 1.42 % 3.02 Interest rate floor 1,000,000 3,020 — — % — % 2.64 Total $ 10,183,511 $ 49,442 $ 84,911 0.58 % 0.63 % 2.53 Other Derivative Activities The Company also enters into derivatives that are not designated as accounting hedges under GAAP. The majority of these derivatives are customer-related derivatives relating to foreign exchange and lending arrangements, as well as derivatives to hedge interest rate risk on SC's secured structured financings and the borrowings under its revolving credit facilities. SC uses both interest rate swaps and interest rate caps to satisfy these requirements and to hedge the variability of cash flows on securities issued by Trusts and borrowings under its warehouse facilities. In addition, derivatives are used to manage risks related to residential and commercial mortgage banking and investing activities. Although these derivatives are used to hedge risk and are considered economic hedges, they are not designated as accounting hedges because the contracts they are hedging are carried at fair value on the balance sheet, resulting in generally symmetrical accounting treatment for the hedging instrument and the hedged item. Mortgage Banking Derivatives The Company's derivatives portfolio includes mortgage banking interest rate lock commitments, forward sale commitments and interest rate swaps. As part of its overall business strategy, the Company originates fixed-rate residential mortgages. It sells a portion of this production to the FHLMC, FNMA, and private investors. The Company uses forward sales as a means of hedging against the economic impact of changes in interest rates on the mortgages that are originated for sale and on interest rate lock commitments. The Company typically retains the servicing rights related to residential mortgage loans that are sold. Most of the Company`s residential MSRs are accounted for at fair value. As deemed appropriate, the Company economically hedges MSRs using interest rate swaps and forward contracts to purchase MBS. Customer-related derivatives The Company offers derivatives to its customers in connection with their risk management needs and requirements. These financial derivative transactions primarily consist of interest rate swaps, caps, floors and foreign exchange contracts. Risk exposure from customer positions is managed through transactions with other dealers, including Santander. Other derivative activities The Company uses foreign exchange contracts to manage the foreign exchange risk associated with certain foreign currency-denominated assets and liabilities. Foreign exchange contracts, which include spot and forward contracts as well as cross-currency swaps, represent agreements to exchange the currency of one country for the currency of another country at an agreed-upon price on an agreed-upon settlement date. Exposure to gains and losses on these contracts will increase or decrease over their respective lives as currency exchange and interest rates fluctuate. NOTE 12. DERIVATIVES (continued) Other derivative instruments primarily include forward contracts related to certain investment securities sales, an overnight indexed swap, a total return swap on Visa, Inc. Class B common shares, and equity options, which manage the Company's market risk associated with certain investments and customer deposit products. Derivatives Not Designated in Hedge Relationships – Notional and Fair Values Other derivative activities at March 31, 2018 and December 31, 2017 included: Notional Asset derivatives Fair value Liability derivatives Fair value (in thousands) March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Mortgage banking derivatives: Forward commitments to sell loans $ 318,562 $ 311,852 $ 1 $ 3 $ 972 $ 459 Interest rate lock commitments 175,662 126,194 2,253 2,105 — — Mortgage servicing 355,000 330,000 1,006 193 9,800 2,092 Total mortgage banking risk management 849,224 768,046 3,260 2,301 10,772 2,551 Customer related derivatives: Swaps receive fixed 9,525,889 9,328,079 34,637 72,912 157,132 70,348 Swaps pay fixed 9,852,498 9,576,893 210,611 110,109 27,306 51,380 Other 2,054,761 1,834,962 25,707 19,971 23,841 18,308 Total customer related derivatives 21,433,148 20,739,934 270,955 202,992 208,279 140,036 Other derivative activities: Foreign exchange contracts 3,708,688 2,764,999 20,053 24,932 26,872 25,521 Interest rate swap agreements 2,176,064 1,749,349 16,685 9,596 1,520 1,631 Interest rate cap agreements 10,851,530 10,932,707 197,801 135,942 — 32,109 Options for interest rate cap agreements 10,825,149 10,906,081 — 32,165 197,548 135,824 Other 979,071 824,786 4,103 5,874 5,924 5,228 Total $ 50,822,874 $ 48,685,902 $ 512,857 $ 413,802 $ 450,915 $ 342,900 NOTE 12. DERIVATIVES (continued) Gains (Losses) on All Derivatives The following Condensed Consolidated Statement of Operations line items were impacted by the Company’s derivative activities for the three-month periods ended March 31, 2018 and 2017 : Three-Month Period Ended March 31, Derivative Activity (1) Line Item 2018 2017 (in thousands) Cash flow hedges: Pay fixed-receive variable interest rate swaps Interest expense on borrowings $ 2,764 $ 2,343 Pay variable receive-fixed interest rate swap Interest income on loans (2,020 ) (2,781 ) Other derivative activities: Forward commitments to sell loans Miscellaneous income, net (514 ) (10,940 ) Interest rate lock commitments Miscellaneous income, net 148 1,994 Mortgage servicing Miscellaneous income, net (6,895 ) 497 Customer related derivatives Miscellaneous income, net 2,586 (1,887 ) Foreign exchange Miscellaneous income, net 1,289 2,260 Interest rate swaps, caps, and options Miscellaneous income, net 9,717 1,204 Interest expense — — Total return settlement Other administrative expenses — (505 ) Other Miscellaneous income, net (2,831 ) (1,501 ) (1) Gains are disclosed as positive numbers while losses are shown as a negative number regardless of the line item being affected. The amount of loss recognized in Other Comprehensive Income for cash flow hedge derivatives was $16.1 million and $4.1 million , net of tax, for the three-month periods ended ended March 31, 2018 and March 31, 2017, respectively. The amount of gain reclassified from Other Comprehensive Income into earnings for cash flow hedge derivatives was $1.2 million for the three-month period ended ended March 31, 2018 and the amount of loss reclassified from Other Comprehensive Income into earnings for cash flow hedge derivatives was $ 1.6 million , net of tax, for the three-month period ended ended March 31, 2017. Disclosures about Offsetting Assets and Liabilities The Company enters into legally enforceable master netting agreements, which reduce risk by permitting netting of transactions with the same counterparty on the occurrence of certain events. A master netting agreement allows two counterparties the ability to net-settle amounts under all contracts, including any related collateral posted, through a single payment and in a single currency. The right to offset and certain terms regarding the collateral process, such as valuation, credit events and settlement, are contained in the ISDA master agreement. The Company's financial instruments, including resell and repurchase agreements, securities lending arrangements, derivatives and cash collateral, may be eligible for offset on its Condensed Consolidated Balance Sheet s. The Company has elected to present derivative balances on a gross basis even if the derivative is subject to a legally enforceable master netting ISDA for all trades executed after April 1, 2013. Collateral that is received or pledged for these transactions is disclosed within the “Gross amounts not offset in the Condensed Consolidated Balance Sheet ” section of the tables below. Prior to April 1, 2013, the Company had elected to net all caps, floors, and interest rate swaps when it had an ISDA agreement with the counterparty. The collateral received or pledged in connection with these transactions is disclosed within the “Gross amounts offset in the Condensed Consolidated Balance Sheet " section of the tables below. NOTE 12. DERIVATIVES (continued) Information about financial assets and liabilities that are eligible for offset on the Condensed Consolidated Balance Sheet as of March 31, 2018 and December 31, 2017 , respectively, is presented in the following tables: Offsetting of Financial Assets Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet (in thousands) Gross Amounts of Recognized Assets Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount March 31, 2018 Cash flow hedges $ 75,793 $ — $ 75,793 $ — $ 50,677 $ 25,116 Other derivative activities (1) 510,604 7,496 503,108 1,978 106,006 395,124 Total derivatives subject to a master netting arrangement or similar arrangement 586,397 7,496 578,901 1,978 156,683 420,240 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 2,253 — 2,253 — — 2,253 Total Derivative Assets $ 588,650 $ 7,496 $ 581,154 $ 1,978 $ 156,683 $ 422,493 December 31, 2017 Cash flow hedges $ 49,442 $ — $ 49,442 $ — $ 3,076 $ 46,366 Other derivative activities (1) 411,697 6,731 404,966 2,021 77,975 324,970 Total derivatives subject to a master netting arrangement or similar arrangement 461,139 6,731 454,408 2,021 81,051 371,336 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 2,105 — 2,105 — — 2,105 Total Derivative Assets $ 463,244 $ 6,731 $ 456,513 $ 2,021 $ 81,051 $ 373,441 (1) Includes customer-related and other derivatives. (2) Includes mortgage banking derivatives. NOTE 12. DERIVATIVES (continued) Offsetting of Financial Liabilities Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet (in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount March 31, 2018 Cash flow hedges $ 119,955 $ — $ 119,955 $ — $ 211 $ 119,744 Other derivative activities (1) 450,485 13,255 437,230 — 331,304 105,926 Total derivatives subject to a master netting arrangement or similar arrangement 570,440 13,255 557,185 — 331,515 225,670 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 219 — 219 — — 219 Total Derivative Liabilities $ 570,659 $ 13,255 $ 557,404 $ — $ 331,515 $ 225,889 December 31, 2017 Cash flow hedges $ 84,911 $ — $ 84,911 $ — $ 622 $ 84,289 Other derivative activities (1) 342,752 16,236 326,516 — 165,716 160,800 Total derivatives subject to a master netting arrangement or similar arrangement 427,663 16,236 411,427 — 166,338 245,089 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 148 — 148 — — 148 Total Derivative Liabilities $ 427,811 $ 16,236 $ 411,575 $ — $ 166,338 $ 245,237 (1) Includes customer-related and other derivatives. (2) Includes mortgage banking derivatives.

INCOME TAXES

INCOME TAXES	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES An income tax provision of $95.3 million was recorded for the three-month period ended March 31, 2018 , compared to $78.9 million for the corresponding period in 2017 . This resulted in an effective tax rate ("ETR") of 27.0% for the three-month period ended March 31, 2018 , compared to 32.5% for the corresponding period in 2017 . The decrease in the ETR for the three-month period ended March 31, 2018 was due to the reduction in the Federal corporate income tax rate provided for by the TCJA as enacted on December 22, 2017 and effective January 1, 2018. The full impact of the corporate rate reduction on the period-over-period decrease in the ETR was partially off-set by the impact of the TCJA provision that disallows tax deductions for FDIC premiums, and was further off-set by the impact of discrete tax benefits booked in the first quarter of 2017 for certain state tax items. The Company is subject to the income tax laws of the U.S., its states and municipalities and certain foreign countries. These tax laws are complex and are potentially subject to different interpretations by the taxpayer and the relevant governmental taxing authorities. In establishing a provision for income tax expense, the Company must make judgments and interpretations about the application of these inherently complex tax laws. NOTE 13. INCOME TAXES (continued) Actual income taxes paid may vary from estimates depending upon changes in income tax laws, actual results of operations, and the final audit of tax returns by taxing authorities. Tax assessments may arise several years after tax returns have been filed. The Company reviews its tax balances quarterly and, as new information becomes available, the balances are adjusted as appropriate. The Company is subject to ongoing tax examinations and assessments in various jurisdictions. As noted above, the TCJA, among other things, reduced the federal corporate income tax rate from 35% to 21%. Due to the complexities involved in accounting for the enactment of the TCJA, SEC Staff Accounting Bulletin (“SAB”) 118 specifies, among other things, that reasonable estimates of the income tax effects of the TCJA should be used, if determinable. Further, SAB 118 clarifies accounting for income taxes under ASC Topic 740, Income Taxes (ASC 740), if information is not yet available or complete and provides for up to a one-year period in which to complete the required analyses and accounting (the measurement period). The Company has obtained and analyzed all currently available information to record the effect of the change in tax law. While we were able to make a reasonable estimate of the impact of the reduction in the corporate tax rate and the other provisions of the TCJA, the accounting may be impacted by other analyses related to the TCJA, technical corrections or other amendments to the TCJA, and further accounting or administrative tax guidance. The Company filed a lawsuit against the United States in 2009 in Federal District Court in Massachusetts relating to the proper tax consequences of two financing transactions with an international bank through which the Company borrowed $1.2 billion . As a result of these financing transactions, the Company paid foreign taxes of $264.0 million during the years 2003 through 2007 and claimed a corresponding foreign tax credit for foreign taxes paid during those years, which the Internal Revenue Service ("IRS") disallowed. The IRS also disallowed the Company's deductions for interest expense and transaction costs, totaling $74.6 million in tax liability, and assessed penalties and interest totaling approximately $92.5 million . The Company has paid the taxes, penalties and interest associated with the IRS adjustments for all tax years, and the lawsuit will determine whether the Company is entitled to a refund of the amounts paid. In November 2015, the Federal District Court granted the Company's motions for summary judgment and later ordered amounts assessed by the IRS for the years 2003 through 2005 to be refunded to the Company. The IRS appealed that judgment, and the U.S. Court of Appeals for the First Circuit partially reversed the judgment of the Federal District Court, finding that the Company is not entitled to claim the foreign tax credits it claimed but will be allowed to exclude from income $132.0 million (representing half of the U.K. taxes the Company paid) and will be allowed to claim the interest expense deductions. The case has been remanded to the Federal District Court for further proceedings to determine, among other issues, whether penalties should be sustained. On remand, the parties are awaiting the Court’s decision on motions for summary judgment filed by the Company regarding the remaining issues. In response to the First Circuit's decision, the Company, at December 31, 2016, used its previously established $230.1 million tax reserve to write off deferred tax assets and a portion of the receivable that would not be realized under the Court's decision. Additionally, the Company established a $36.8 million tax reserve in relation to items that have not yet been determined by the courts, including potential penalties. Over the next 12 months, it is reasonably possible that changes in the reserve for uncertain tax positions could range from a decrease of $36.8 million to no change . With few exceptions, the Company is no longer subject to federal, state and non-U.S. income tax examinations by tax authorities for years prior to 2006. The Company applies an aggregate portfolio approach whereby income tax effects from accumulated other comprehensive income are released only when an entire portfolio (i.e. all related units of account) of a particular type is liquidated, sold or extinguished.

FAIR VALUE

FAIR VALUE	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
FAIR VALUE	FAIR VALUE General A portion of the Company’s assets and liabilities are carried at fair value, including AFS investment securities and derivative instruments. In addition, the Company elects to account for its residential mortgages HFS and a portion of its MSRs at fair value. Fair value is also used on a nonrecurring basis to evaluate certain assets for impairment or for disclosure purposes. Examples of nonrecurring uses of fair value include impairments for certain loans and foreclosed assets. NOTE 14. FAIR VALUE (continued) As of March 31, 2018 , $14.4 billion of the Company’s total assets consisted of financial instruments measured at fair value on a recurring basis, including financial instruments for which the Company elected the FVO. Approximately $174.4 million of these financial assets were measured using quoted market prices for identical instruments, or Level 1 inputs. Approximately $13.6 billion of these financial assets were measured using valuation methodologies involving market-based and market-derived information, or Level 2 inputs. Approximately $678.6 million of these financial assets were measured using model-based techniques, or Level 3 inputs, and represented approximately 4.7% of total assets measured at fair value on a recurring basis and approximately 0.5% of total consolidated assets. Fair value is defined in GAAP as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The standard focuses on the exit price in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants. GAAP establishes a fair value reporting hierarchy to maximize the use of observable inputs when measuring fair value and defines the three levels of inputs as noted below: • Level 1 - Assets or liabilities for which the identical item is traded on an active exchange, such as publicly-traded instruments. • Level 2 - Assets and liabilities valued based on observable market data for similar instruments. Fair value is estimated using inputs other than quoted prices included within Level 1 that are observable for assets or liabilities, either directly or indirectly. • Level 3 - Assets or liabilities for which significant valuation assumptions are not readily observable in the market, and instruments valued based on the best available data, some of which is internally developed and considers risk premiums that a market participant would require. Fair value is estimated using unobservable inputs that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities may include financial instruments whose value is determined using pricing services, pricing models with internally developed assumptions, discounted cash flow ("DCF") methodologies, or similar techniques, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Assets and liabilities measured at fair value, by their nature, result in a higher degree of financial statement volatility. When available, the Company uses quoted market prices or matrix pricing in active markets to determine fair value and classifies such items as Level 1 or Level 2 assets or liabilities. If quoted market prices in active markets are not available, fair value is determined using third-party broker quotes and/or DCF models incorporating various assumptions including interest rates, prepayment speeds and credit losses. Assets and liabilities valued using broker quotes and/or DCF models are classified as either Level 2 or Level 3, depending on the lowest level classification of an input that is considered significant to the overall valuation. The Company values assets and liabilities based on the principal market in which each would be sold (in the case of assets) or transferred (in the case of liabilities). The principal market is the forum with the greatest volume and level of activity. In the absence of a principal market, the valuation is based on the most advantageous market. In the absence of observable market transactions, the Company considers liquidity valuation adjustments to reflect the uncertainty in pricing the instruments. The fair value of a financial asset is measured on a stand-alone basis and cannot be measured as a group, with the exception of certain financial instruments held and managed on a net portfolio basis. In measuring the fair value of a nonfinancial asset, the Company assumes the highest and best use of the asset by a market participant, not just the intended use, to maximize the value of the asset. The Company also considers whether any credit valuation adjustments are necessary based on the counterparty's credit quality. Any models used to determine fair values or validate dealer quotes based on the descriptions below are subject to review and testing as part of the Company's model validation and internal control testing processes. The Bank's Market Risk Department is responsible for determining and approving the fair values of all assets and liabilities valued at fair value, including the Company's Level 3 assets and liabilities. Price validation procedures are performed and the results are reviewed for Level 3 assets and liabilities by the Market Risk Department. Price validation procedures performed for these assets and liabilities can include comparing current prices to historical pricing trends by collateral type and vintage, comparing prices by product type to indicative pricing grids published by market makers, and obtaining corroborating dealer prices for significant securities. The Company reviews the assumptions utilized to determine fair value on a quarterly basis. Any changes in methodologies or significant inputs used in determining fair values are further reviewed to determine if a change in fair value level hierarchy has occurred. Transfers in and out of Levels 1, 2 and 3 are considered to be effective as of the end of the quarter in which they occur. There were no transfers between Levels 1, 2 or 3 during the three-month periods ended March 31, 2018 and 2017 for any assets or liabilities valued at fair value on a recurring basis. NOTE 14. FAIR VALUE (continued) Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables present the assets and liabilities that are measured at fair value on a recurring basis by major product category and fair value hierarchy as of March 31, 2018 and December 31, 2017 . (in thousands) Level 1 Level 2 Level 3 Balance at Level 1 Level 2 Level 3 Balance at Financial assets: U.S. Treasury securities $ 174,439 $ 1,200,666 $ — $ 1,375,105 $ 139,615 $ 858,497 $ — $ 998,112 Corporate debt — 2,723 — 2,723 — 11,660 — 11,660 ABS — 138,598 348,634 487,232 — 156,910 350,252 507,162 State and municipal securities — 21 — 21 — 23 — 23 MBS — 11,456,513 — 11,456,513 — 12,885,412 — 12,885,412 Investment in debt securities AFS (3)(6) 174,439 12,798,521 348,634 13,321,594 139,615 13,912,502 350,252 14,402,369 Other investments - trading securities 1 3,023 — 3,024 1 — — 1 RICs HFI (4) — — 167,597 167,597 — — 186,471 186,471 LHFS (1)(5) — 162,468 — 162,468 — 197,691 — 197,691 MSRs (2) — — 160,130 160,130 — — 145,993 145,993 Other assets - derivatives (3) — 586,396 2,254 588,650 — 461,139 2,105 463,244 Total financial assets $ 174,440 $ 13,550,408 $ 678,615 $ 14,403,463 $ 139,616 $ 14,571,332 $ 684,821 $ 15,395,769 Financial liabilities: Other liabilities - derivatives (3) — 570,150 509 570,659 — 427,217 594 427,811 Total financial liabilities $ — $ 570,150 $ 509 $ 570,659 $ — $ 427,217 $ 594 $ 427,811 (1) LHFS disclosed on the Condensed Consolidated Balance Sheet s also includes LHFS that are held at the lower of cost or fair value and are not presented within this table. (2) The Company has total MSRs of $163.1 million and $149.2 million as of March 31, 2018 .and December 31, 2017 , respectively. The Company has elected to account for the majority of its MSR balance using the FVO, while the remainder of the MSRs are accounted for using the lower of cost or fair value and are not presented within this table. (3) Refer to Note 3 for the fair value of investment securities and to Note 12 for the fair values of derivative assets and liabilities, on a further disaggregated basis. (4) RICs collateralized by vehicle titles at SC and RV/marine loans at SBNA. (5) Residential mortgage loans (6) Investment in debt securities AFS disclosed on the Consolidated Balance Sheets at December 31, 2017 included $10.8 million of equity securities valued using the net asset value as a practical expedient that are not presented within this table. Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis The Company may be required to measure certain assets and liabilities at fair value on a nonrecurring basis in accordance with GAAP from time to time. These adjustments to fair value usually result from application of lower-of-cost-or-fair value accounting or certain impairment measures. Assets measured at fair value on a nonrecurring basis that were still held on the balance sheet were as follows: (in thousands) Level 1 Level 2 Level 3 Balance at Level 1 Level 2 Level 3 Balance at Impaired commercial LHFI $ — $ 132,339 $ 310,237 $ 442,576 $ — $ 226,832 $ 356,343 $ 583,175 Foreclosed assets — 2,373 104,014 106,387 — 20,011 106,581 126,592 Vehicle inventory — 415,262 — 415,262 — 325,203 — 325,203 LHFS (1) — — 1,798,222 1,798,222 — — 2,324,830 2,324,830 Auto loans impaired due to bankruptcy — 128,641 — 128,641 — 121,578 — 121,578 MSRs — — 9,381 9,381 — — 9,273 9,273 (1) These amounts include $967.8 million and $1.1 billion of personal loans held for sale that are impaired as of March 31, 2018 and December 31, 2017 , respectively. NOTE 14. FAIR VALUE (continued) Valuation Processes and Techniques Impaired commercial LHFI in the table above represents the recorded investment of impaired commercial loans for which the Company measures impairment during the period based on the fair value of the underlying collateral supporting the loan. Written offers to purchase a specific impaired loan are considered observable market inputs, which are considered Level 1 inputs. Appraisals are obtained to support the fair value of the collateral and incorporate measures such as recent sales prices for comparable properties and are considered Level 2 inputs. Loans for which the value of the underlying collateral is determined using a combination of real estate appraisals, field examinations and internal calculations are classified as Level 3. The inputs in the internal calculations may include the loan balance, estimation of the collectability of the underlying receivables held by the customer used as collateral, sale and liquidation value of the inventory held by the customer used as collateral and historical loss-given-default parameters. In cases in which the carrying value exceeds the fair value of the collateral less cost to sell, an impairment charge is recognized. The net carrying value of these loans was $357.7 million and $491.5 million at March 31, 2018 and December 31, 2017 , respectively. Loans previously impaired which were not marked to fair value during the periods presented are excluded from this table. Foreclosed assets represent the recorded investment in assets taken during the period presented in foreclosure of defaulted loans, and are primarily comprised of commercial and residential real properties and generally measured at fair value less costs to sell. The fair value of the real property is generally determined using appraisals or other indications of market value based on recent comparable sales of similar properties or assumptions generally observable in the marketplace. The Company estimates the fair value of its vehicles, which are obtained either through repossession or lease termination, using historical auction rates and current market values of used cars. The Company's LHFS portfolios that are measured at fair value on a nonrecurring basis primarily consist of personal, commercial, and RICs LHFS. The estimated fair value for these LHFS is calculated based on a combination of estimated market rates for similar loans with similar credit risks and a DCF analysis in which the Company uses significant unobservable inputs on key assumptions, including historical default rates and adjustments to reflect voluntary prepayments, prepayment rates, discount rates reflective of the cost of funding, and credit loss expectations. The lower of cost or fair value adjustment for personal loans held for sale includes customer default activity and adjustments related to the net change in the portfolio balance during the reporting period. For loans that are considered collateral-dependent, such as certain bankruptcy loans, impairment is measured based on the fair value of the collateral less its estimated cost to sell. For the underlying collateral, the estimated fair value is obtained using historical auction rates and current market levels of used car prices. A portion of the Company's MSRs are measured at fair value on a nonrecurring basis. These MSRs are priced internally using a DCF model. The DCF model incorporates assumptions that market participants would use in estimating future net servicing income, including portfolio characteristics, prepayments assumptions, discount rates, delinquency and foreclosure rates, late charges, other ancillary revenues, cost to service and other economic factors. Due to the unobservable nature of certain valuation inputs, these MSRs are classified as Level 3. Fair Value Adjustments The following table presents the increases and decreases in value of certain assets that are measured at fair value on a nonrecurring basis for which a fair value adjustment has been included in the Condensed Consolidated Statements of Operations relating to assets held at period-end: Three-Month Period Ended March 31, (in thousands) Statement of Operations Location 2018 2017 Impaired LHFI Provision for credit losses $ (29,312 ) $ (45,772 ) Foreclosed assets Miscellaneous income (1) (2,473 ) (1,742 ) LHFS Provision for credit losses (381 ) — LHFS Miscellaneous income (1) (70,490 ) (66,121 ) Auto loans impaired due to bankruptcy Provision for credit losses (82,145 ) (23,600 ) MSRs Miscellaneous income, net (549 ) 95 (1) These amounts reduce Miscellaneous income. NOTE 14. FAIR VALUE (continued) Level 3 Rollforward for Assets and Liabilities Measured at Fair Value on a Recurring Basis The tables below present the changes in Level 3 balances for the three-month periods ended March 31, 2018 and 2017 , respectively, for those assets and liabilities measured at fair value on a recurring basis. Three-Month Period Ended March 31, 2018 Three-Month Period Ended March 31, 2017 (in thousands) Investments RICs HFI MSRs Derivatives Total Investments RICs HFI MSRs Derivatives Total Balances, beginning of period $ 350,252 $ 186,471 $ 145,993 $ 1,514 $ 684,230 $ 814,567 $ 217,170 $ 146,589 $ (29,000 ) $ 1,149,326 Losses in other comprehensive income (499 ) — — — (499 ) (619 ) — — — (619 ) Gains/(losses) in earnings — 5,276 15,043 134 20,453 — 16,891 1,457 1,194 19,542 Additions/Issuances — 1,349 2,755 — 4,104 — 13,331 5,730 — 19,061 Settlements (1) (1,119 ) (25,499 ) (3,661 ) 97 (30,182 ) (240,494 ) (44,919 ) (4,321 ) 97 (289,637 ) Balances, end of period $ 348,634 $ 167,597 $ 160,130 $ 1,745 $ 678,106 $ 573,454 $ 202,473 $ 149,455 $ (27,709 ) $ 897,673 Changes in unrealized gains (losses) included in earnings related to balances still held at end of period $ — $ 5,276 $ 15,043 $ (14 ) $ 20,305 $ — $ 16,891 $ 1,457 $ (800 ) $ 17,548 (1) Settlements include charge-offs, prepayments, pay downs and maturities. The gains in earnings reported in the table above related to the RICs HFI for which the Company elected the FVO are driven by three primary factors: 1) the recognition of interest income, 2) recoveries of previously charged-off RICs, and 3) actual performance of the portfolio since the Change in Control. Recoveries from RICs that were charged off at the Change in Control date are a direct increase to the gain recognized within the portfolio. In accordance with ASC 805, Business Combinations , the Company did not ascribe a fair value to the portfolio of sub-prime charged-off RICs at the Change in Control date. Recoveries of previously charged off loans are usually recorded as a reduction to charge-offs in the period in which the recovery is made; however, in instances where the FVO is elected, it will flow through the fair value mark. At the Change in Control date, the UPB of the previously charged-off RIC portfolio was approximately $3.0 billion . Valuation Processes and Techniques - Recurring Fair Value Assets and Liabilities The following is a description of the valuation techniques used for instruments measured at fair value on a recurring basis: Debt Securities Classified as AFS and Trading Securities Debt securities accounted for at fair value include both AFS and trading securities portfolios. The Company utilizes a third-party pricing service to value its investment securities portfolios on a global basis. Its primary pricing service has consistently proved to be a high quality third-party pricing provider. For those investments not valued by pricing vendors, other trusted market sources are utilized. The Company monitors and validates the reliability of vendor pricing on an ongoing basis, which can include pricing methodology reviews, performing detailed reviews of the assumptions and inputs used by the vendor to price individual securities, and price validation testing. Price validation testing is performed independently of the risk-taking function and can include corroborating the prices received from third-party vendors with prices from another third-party source, reviewing valuations of comparable instruments, comparison to internal valuations, or by reference to recent sales of similar securities. The classification of securities within the fair value hierarchy is based upon the activity level in the market for the security type and the observability of the inputs used to determine their fair values. Trading securities and certain of the Company's U.S. Treasury securities are valued utilizing observable market quotes. The Company obtains vendor trading platform data (actual prices) from a number of live data sources, including active market makers and interdealer brokers. These certain investment securities are, therefore, classified as Level 1. NOTE 14. FAIR VALUE (continued) Actively traded quoted market prices for the majority of the debt securities AFS, such as U.S. Treasury and government agency securities, corporate debt, state and municipal securities, and MBS, are not readily available. The Company's principal markets for its investment securities are the secondary institutional markets with an exit price that is predominantly reflective of bid-level pricing in these markets. These investment securities are priced by third-party pricing vendors. The third-party vendors use a variety of methods when pricing these securities that incorporate relevant observable market data to arrive at an estimate of what a buyer in the marketplace would pay for a security under current market conditions. These investment securities are, therefore, considered Level 2. Certain ABS are valued using DCF models. The DCF models are obtained from a third-party pricing vendor who uses observable market data and therefore are classified as Level 2. Other ABS that could not be valued using a third-party pricing service are valued using an internally-developed DCF model. When estimating the fair value using this model, the Company uses its best estimate of the key assumptions, which include the discount rates and forward yield curves. The Company uses comparable bond indices based on industry, term, and rating to discount the expected future cash flows. Determining the comparability of assets involves significant subjectivity related to asset type differences, cash flows, performance and other inputs. The inability of the Company to corroborate the fair value of the ABS due to the limited available observable data on these ABS resulted in a fair value classification of Level 3. Realized gains and losses on investments in debt securities are recognized in the Condensed Consolidated Statements of Operations through Net (losses)/gains on sale of investment securities RICs HFI For certain RICs HFI, the Company has elected the FVO. The fair values of RICs are estimated using the DCF model. In estimating the fair value using this model, the Company uses significant unobservable inputs on key assumptions, which includes historical default rates and adjustments to reflect voluntary prepayments, prepayment rates based on available data from a comparable market securitization of similar assets, discount rates reflective of the cost of funding debt issuance and recent historical equity yields, recovery rates based on the average severity utilizing reported severity rates and loss severity utilizing available market data from a comparable securitized pool. Accordingly, RICs HFI for which the Company has elected the FVO are classified as Level 3. LHFS The Company's LHFS portfolios that are measured at fair value on a recurring basis consists primarily of residential mortgage LHFS. The fair values of LHFS are estimated using published forward agency prices to agency buyers such as FNMA and FHLMC. The majority of the residential mortgage LHFS portfolio is sold to these two agencies. The fair value is determined using current secondary market prices for portfolios with similar characteristics, adjusted for servicing values and market conditions. These loans are regularly traded in active markets, and observable pricing information is available from market participants. The prices are adjusted as necessary to include the embedded servicing value in the loans as well as the specific characteristics of certain loans that are priced based on the pricing of similar loans. These adjustments represent unobservable inputs to the valuation, and are not significant given the relative insensitivity of the value to changes in these inputs to the fair value of the loans. Accordingly, residential mortgage LHFS are classified as Level 2. Gains and losses on residential mortgage LHFS are recognized in the Condensed Consolidated Statements of Operations through Miscellaneous income. See further discussion below in the section captioned "FVO for Financial Assets and Financial Liabilities." NOTE 14. FAIR VALUE (continued) MSRs The model to value MSRs estimates the present value of the future net cash flows from mortgage servicing activities based on various assumptions. These cash flows include servicing and ancillary revenue, offset by the estimated costs of performing servicing activities. Significant assumptions used in the valuation of residential MSRs include changes in anticipated loan prepayment rates ("CPRs") and the discount rate, reflective of a market participant's required return on an investment for similar assets. Other important valuation assumptions include market-based servicing costs and the anticipated earnings on escrow and similar balances held by the Company in the normal course of mortgage servicing activities. All of these assumptions are considered to be unobservable inputs. Historically, servicing costs and discount rates have been less volatile than CPR and earnings rates, both of which are directly correlated with changes in market interest rates. Increases in prepayment speeds, discount rates and servicing costs result in lower valuations of MSRs. Decreases in the anticipated earnings rate on escrow and similar balances result in lower valuations of MSRs. For each of these items, the Company makes assumptions based on current market information and future expectations. All of the assumptions are based on standards that the Company believes would be utilized by market participants in valuing MSRs and are derived and/or benchmarked against independent public sources. Accordingly, MSRs are classified as Level 3. Gains and losses on MSRs are recognized on the Condensed Consolidated Statements of Operations through Miscellaneous income, net. See further discussion on MSRs in Note 8 . Listed below are the most significant inputs that are utilized by the Company in the evaluation of residential MSRs: • A 10% and 20% increase in the CPR speed would decrease the fair value of the residential servicing asset by $4.9 million and $9.5 million , respectively, at March 31, 2018 . • A 10% and 20% increase in the discount rate would decrease the fair value of the residential servicing asset by $6.0 million and $11.7 million , respectively, at March 31, 2018 . Significant increases (decreases) in any of those inputs in isolation would result in significantly (lower) higher fair value measurements. These sensitivity calculations are hypothetical and should not be considered to be predictive of future performance. Changes in fair value based on adverse changes in assumptions generally cannot be extrapolated because the relationship of the change in assumption to the change in fair value may not be linear. Also, the effect of an adverse variation in a particular assumption on the fair value of the MSRs is calculated without changing any other assumption, while in reality changes in one factor may result in changes in another, which may either magnify or counteract the effect of the change. Prepayment estimates generally increase when market interest rates decline and decrease when market interest rates rise. Discount rates typically increase when market interest rates increase and/or credit and liquidity risks increase, and decrease when market interest rates decline and/or credit and liquidity conditions improve. Derivatives The valuation of these instruments is determined using widely accepted valuation techniques, including DCF analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable and unobservable market-based inputs. The fair value represents the estimated amount the Company would receive or pay to terminate the contract or agreement, taking into account current interest rates, foreign exchange rates, equity prices and, when appropriate, the current creditworthiness of the counterparties. The Company incorporates credit valuation adjustments in the fair value measurement of its derivatives to reflect the counterparty's nonperformance risk in the fair value measurement of its derivatives, except for those derivative contracts with associated credit support annexes which provide credit enhancements, such as collateral postings and guarantees. The Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy. Certain of the Company's derivatives utilize Level 3 inputs, which are primarily related to mortgage banking derivatives-interest rate lock commitments and total return settlement derivative contracts. NOTE 14. FAIR VALUE (continued) The DCF model is utilized to determine the fair value of the mortgage banking derivatives-interest rate lock commitments and the total return settlement derivative contracts. The significant unobservable inputs for mortgage banking derivatives used in the fair value measurement of the Company's loan commitments are "pull through" percentage and the MSR value that is inherent in the underlying loan value. The pull through percentage is an estimate of loan commitments that will result in closed loans. The significant unobservable inputs for total return settlement derivative contracts used in the fair value measurement of the Company's liabilities are discount percentages, which are based on comparable financial instruments. Significant increases (decreases) in any of these inputs in isolation would result in significantly higher (lower) fair value measurements. Significant increases (decreases) in the fair value of a mortgage banking derivative asset (liability) results when the probability of funding increases (decreases). Significant increases (decreases) in the fair value of a mortgage loan commitment result when the embedded servicing value increases (decreases). Gains and losses related to derivatives affect various line items in the Condensed Consolidated Statements of Operations . See Note 12 for a discussion of derivatives activity. Level 3 Inputs - Significant Recurring and Nonrecurring Fair Value Assets and Liabilities The following table presents quantitative information about the significant unobservable inputs within significant Level 3 recurring and nonrecurring assets and liabilities at March 31, 2018 and December 31, 2017 . (dollars in thousands) Fair Value at March 31, 2018 Valuation Technique Unobservable Inputs Range Financial Assets: ABS Financing bonds $ 304,851 DCF Discount Rate (1) 2.80% - 3.02% (2.84%) Sale-leaseback securities $ 43,783 Consensus Pricing (2) Offered quotes (3) 117.11 % RICs HFI $ 167,597 DCF Prepayment rate (CPR) (4) 6.66 % Discount Rate (5) 9.50% - 14.50% (12.41%) Recovery Rate (6) 25.00% - 43.00% (41.59%) Personal LHFS $ 967,789 Lower of Market or Income Approach Market Participant View 70.00% - 80.00% Discount Rate 15.00% - 20.00% Default Rate 30.00% - 40.00% Net Principal Payment Rate 50.00% - 70.00% Loss Severity Rate 90.00% - 95.00% RICs HFS $ 620,168 Income Approach Expected Yield 1.00% - 2.00% Expected Life Time Cumulative Loss 4.00% - 6.00% Weighted Average Life 2 -3 years MSRs (11) $ 160,130 DCF Prepayment rate ("CPR") (7) 3.92% - 85.90% (8.20%) Discount Rate (8) 9.75 % Mortgage banking interest rate lock commitments $ 2,253 DCF Pull through percentage (9) 78.00 % MSR value (10) .73% - 1.03% (1.03%) (1) Based on the applicable term and discount index. (2) Consensus pricing refers to fair value estimates that are generally developed using information such as dealer quotes or other third-party valuations or comparable asset prices. (3) Based on the nature of the input, a range or weighted average does not exist. For sale-leaseback securities, the Company owns one security. (4) Based on the analysis of available data from a comparable market securitization of similar assets. (5) Based on the cost of funding of debt issuance and recent historical equity yields. (6) Based on the average severity utilizing reported severity rates and loss severity utilizing available market data from a comparable securitized pool. (7) Average CPR projected from collateral stratified by loan type, note rate and maturity. (8) Based on the nature of the input, a range or weighted average does not exist. (9) Historical weighted average based on principal balance calculated as the percentage of loans originated for sale divided by total commitments less outstanding commitments. (10) MSR value is the estimated value of the servicing right embedded in the underlying loan, expressed in basis points of outstanding unpaid principal balance. (11) Excludes MSR valued on a non-recurring basis for which we do not consider there to be significant unobservable assumptions. NOTE 14. FAIR VALUE (continued) Fair Value at December 31, 2017 Valuation Technique Unobservable Inputs Range Financing bonds ABS Financing bonds $ 304,727 DCF Discount Rate (1) 2.16% - 2.90% (2.28%) Sale-leaseback securities $ 45,525 Consensus Pricing (2) Offered Quotes (3) 120.19 % RICs HFI $ 186,471 DCF CPR (4) 6.66 % Discount Rate (5) 9.50% - 14.50% (12.37%) Recovery Rate (6) 25.00% - 43.00% (41.51%) Personal LHFS $ 1,062,090 Lower of Market or Income Approach Market Participant View 70.00% - 80.00% Discount Rate 15.00% - 20.00% Default Rate 30.00% - 40.00% Net Principal Payment Rate 50.00% - 70.00% Loss Severity Rate 90.00% - 95.00% RICs HFS $ 1,101,049 DCF Discount Rate 3.00% - 6.00% Default Rate 3.00% - 4.00% Prepayment Rate 15.00% - 20.00% Loss Severity Rate 50.00% - 60.00% MSRs (11) $ 145,993 DCF CPR (7) 0.06% - 46.95% (9.80%) Discount Rate (8) 9.90 % Mortgage banking interest rate lock commitments $ 2,105 DCF Pull through percentage (9) 76.98 % MSR Value (10) 0.73% - 1.03% (0.95%) (1) Based on the applicable term and discount index. (2) Consensus pricing refers to fair value estimates that are generally developed using information such as dealer quotes or other third-party valuations or comparable asset prices. (3) Based on the nature of the input, a range or weighted average does not exist. For sale-leaseback

NON-INTEREST INCOME

NON-INTEREST INCOME	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
NON-INTEREST INCOME	NON-INTEREST INCOME The following table presents the details of the Company's Non-interest income for the following periods: Three-Month Period Ended March 31, (in thousands) 2018 2017 (1) Non-interest income: Consumer and commercial fees $ 138,561 $ 154,349 Lease income 540,896 496,045 Miscellaneous income, net Mortgage banking income, net 16,345 13,174 BOLI 14,568 17,299 Capital market revenue 56,613 45,817 Net gain on sale of operating leases 53,200 22,715 Asset and wealth management fees 43,337 36,501 Loss on sale of non-mortgage loans (43,910 ) (69,768 ) Other miscellaneous (loss)/income, net (15,583 ) 11,767 Net (losses)/gains on sale of investment securities (663 ) 519 Total Non-interest income $ 803,364 $ 728,418 (1) - Prior period amounts have not been adjusted under the modified retrospective method. For further information, see Note 1. NOTE 15. NON-INTEREST INCOME (continued) Disaggregation of Revenue from Contracts with Customers Beginning January 1, 2018 the Company adopted the new accounting standard, "Revenue from Contracts with Customers", which requires the Company to disclose a disaggregation of revenue from contracts with customers that falls within the scope of this new accounting standard. The scope of the guidance explicitly excludes net interest income as well as many other revenues for financial assets and liabilities including loans, leases, securities, and derivatives. Therefore, the Company has evaluated the revenue streams within our Non-interest income line items to determine whether they are in-scope or out-of-scope. The following table presents the Company's Non-interest income disaggregated by revenue source. Three-Month Period Ended March 31, (in thousands) 2018 2017 (1) Non-interest income: In-scope of Revenue from Contracts with Customers: Depository services (2) $ 58,346 $ 60,440 Commission and trailer fees (3) 29,450 31,168 Interchange income, net (3) 13,473 12,649 Underwriting service fees (3) 24,504 24,600 Asset and wealth management fees (3) 38,203 28,245 Other revenue from contracts with customers (3) 10,002 13,311 Total In-scope of Revenue from Contracts with Customers 173,978 170,413 Out-of-scope of Revenue from Contracts with Customers: Consumer and commercial fees (4) 73,204 87,096 Lease income 540,896 496,045 Miscellaneous income/(loss) (4) 15,949 (25,655 ) Net (losses)/gains on sale of investment securities (663 ) 519 Total Out-of-scope of Revenue from Contracts with Customers 629,386 558,005 Total Non-interest income $ 803,364 $ 728,418 (1) - Prior period amounts have not been adjusted under the modified retrospective method. For further information, see Note 1. (2) - Primarily recorded in the Company's Condensed Consolidated Statements of Operations within Consumer and commercial fees . (3) - Primarily recorded in the Company's Condensed Consolidated Statements of Operations within Miscellaneous income, net. (4) - The balance presented excludes certain revenue streams that are considered in-scope and presented above. Arrangements with Multiple Performance Obligations Our contracts with customers may include multiple performance obligations. For such arrangements, we allocate revenue to each performance obligation based on its relative standalone selling price. We generally determine standalone selling prices based on the prices charged to customers or using expected cost plus margin. Practical Expedients In instances where incremental costs, such as commission expenses, are incurred and the period of benefit is equal to or less than one year, the Company has elected to apply the practical expedient where the Company expenses such amounts as incurred. These costs are recorded within Compensation and benefits, within the Condensed Consolidated Statements of Operations. In instances where contracts with customers contain a financing component and the Company expects the customer to pay for the goods or services within one year or less, the Company has elected to apply the practical expedient where the Company does not adjust the contracted amount of consideration for the effects of financing components. The Company does not disclose the value of unsatisfied performance obligations for (i) contracts with an original expected length of one year or less or (ii) contracts for which we recognize revenue at the amount to which we have the right to invoice for services performed. As a result of the practical expedient and for the Company's material revenue streams, there are no unperformed performance obligations. As a result of the practical expedient and the Company's revenue recognition for contracts with customers, there are no material contract assets or liabilities.

COMMITMENTS, CONTINGENCIES AND

COMMITMENTS, CONTINGENCIES AND GUARANTEES	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS, CONTINGENCIES AND GUARANTEES	COMMITMENTS, CONTINGENCIES AND GUARANTEES Off-Balance Sheet Risk - Financial Instruments In the normal course of business, the Company utilizes a variety of financial instruments with off-balance sheet risk to meet the financing needs of its customers and manage its exposure to fluctuations in interest rates. These financial instruments include commitments to extend credit, letters of credit, loans sold with recourse, forward contracts, and interest rate and cross currency swaps, caps and floors. These financial instruments may involve, to varying degrees, elements of credit, liquidity, and interest rate risk in excess of the amount recognized on the Condensed Consolidated Balance Sheet s. The contractual or notional amounts of these financial instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The Company’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit, letters of credit and loans sold with recourse is represented by the contractual amount of those instruments. The Company uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. For forward contracts and interest rate swaps, caps and floors, the contract or notional amounts do not represent exposure to credit loss. The Company controls the credit risk of its forward contracts and interest rate swaps, caps and floors through credit approvals, limits and monitoring procedures. See Note 12 to these Condensed Consolidated Financial Statements for discussion of all derivative contract commitments. The following table details the amount of commitments at the dates indicated: Other Commitments March 31, 2018 December 31, 2017 (in thousands) Commitments to extend credit $ 28,753,073 $ 29,475,864 Letters of credit 1,405,521 1,559,297 Unsecured revolving lines of credit 27,314 27,938 Recourse exposure on sold loans 46,720 46,572 Commitments to sell loans 26,314 19,477 Total commitments $ 30,258,942 $ 31,129,148 Commitments to Extend Credit Commitments to extend credit generally have fixed expiration dates, are variable rate, and contain provisions that permit the Company to terminate or otherwise renegotiate the contracts in the event of a significant deterioration in the customer’s credit quality. These arrangements normally require payment of a fee by the customer, the pricing of which is based on prevailing market conditions, credit quality, probability of funding, and other relevant factors. Since many of these commitments are expected to expire without being drawn upon, the contract amounts are not necessarily indicative of future cash requirements. Included within the reported balances for Commitments to extend credit at March 31, 2018 and December 31, 2017 are $6.3 billion and $6.4 billion , respectively, of commitments that can be canceled by the Company without notice. The following table details the amount of commitments to extend credit expiring per period as of the dates indicated: (in thousands) March 31, 2018 December 31, 2017 1 year or less $ 5,084,166 $ 5,858,236 Over 1 year to 3 years 4,838,484 5,381,113 Over 3 years to 5 years 4,747,297 4,478,320 Over 5 years (1) 14,083,126 13,758,195 Total $ 28,753,073 $ 29,475,864 (1) Includes certain commitments to extend credit that do not have a contractual maturity date, but are expected to be outstanding more than 5 years . Unsecured Revolving Lines of Credit Such commitments, included in the Commitments to extend credit table above, arise primarily from agreements with customers for unused lines of credit on unsecured revolving accounts and credit cards, provided there is no violation of conditions in the underlying agreement. These commitments, substantially all of which the Company can terminate at any time and which do not necessarily represent future cash requirements, are periodically reviewed based on account usage, customer creditworthiness and loan qualifications. NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) Letters of Credit The Company’s letters of credit meet the definition of a guarantee. Letters of credit commit the Company to make payments on behalf of its customers if specified future events occur. The guarantees are primarily issued to support public and private borrowing arrangements. The weighted average term of these commitments at March 31, 2018 was 16.7 months. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. In the event of a requested draw by the beneficiary that complies with the terms of the letter of credit, the Company would be required to honor the commitment. The Company has various forms of collateral for these letters of credit, including real estate assets and other customer business assets. The maximum undiscounted exposure related to these commitments at March 31, 2018 was $1.4 billion . The fees related to letters of credit are deferred and amortized over the life of the respective commitments, and were immaterial to the Company’s financial statements at March 31, 2018 . Management believes that the utilization rate of these letters of credit will continue to be substantially less than the amount of the commitments, as has been the Company’s experience to date. As of March 31, 2018 and December 31, 2017 , the liability related to these letters of credit was $3.5 million and $18.2 million , respectively, which is recorded within the reserve for unfunded lending commitments in Other liabilities on the Condensed Consolidated Balance Sheet . The credit risk associated with letters of credit is monitored using the same risk rating system utilized within the loan and financing lease portfolio. Also included within the reserve for unfunded lending commitments at March 31, 2018 and December 31, 2017 were lines of credit outstanding of $86.4 million and $90.9 million , respectively. The following table details the amount of letters of credit expiring per period as of the dates indicated: (in thousands) March 31, 2018 December 31, 2017 1 year or less $ 702,190 $ 918,191 Over 1 year to 3 years 328,062 286,505 Over 3 years to 5 years 329,005 312,881 Over 5 years 46,264 41,720 Total $ 1,405,521 $ 1,559,297 Loans Sold with Recourse The Company has loans sold with recourse that meet the definition of a guarantee. For loans sold with recourse under the terms of its multifamily sales program with FNMA, the Company retained a portion of the associated credit risk. The UPB outstanding of loans sold in these programs was $102.6 million as of March 31, 2018 and $136.0 million as of December 31, 2017 . As a result of its agreement with FNMA, the Company retained a 100% first loss position on each multifamily loan sold to FNMA until the earlier to occur of (i) the aggregate approved losses on multifamily loans sold to FNMA reaching the maximum loss exposure for the portfolio as a whole of $12.2 million as of March 31, 2018 and $12.2 million as of December 31, 2017 or (ii) the time when such loans sold to FNMA under this program are fully paid off. Any losses sustained as a result of impediments in standard representations and warranties would be in addition to the maximum loss exposure. At the time of the sale, the Company established a liability which represented the fair value of the retained credit exposure and the amount the Company estimates it would have to pay a third party to assume the retained recourse obligation. The estimated liability is calculated as the present value of losses that the portfolio is projected to incur based upon specific internal information and an industry-based default curve with a range of estimated losses. At March 31, 2018 and December 31, 2017 , the Company had $0.9 million and $1.3 million , respectively, of reserves classified in Accrued expenses and payables on the Condensed Consolidated Balance Sheets related to the retained credit exposure for loans sold to the FNMA under this program. The Company's commitment will expire in March 2039 based on the maturity of the loans sold with recourse. Losses sustained by the Company may be offset, or partially offset, by proceeds resulting from the disposition of the underlying mortgaged properties. Approval from the FNMA is required for all transactions related to the liquidation of properties underlying the mortgages. Commitments to Sell Loans The Company enters into forward contracts relating to its mortgage banking business to hedge the exposures from commitments to make new residential mortgage loans with existing customers and from mortgage loans classified as LHFS. These contracts mature in less than one year . NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) SC Commitments SC is party to agreements with Bluestem whereby SC is committed to purchase certain new advances on personal revolving financings originated by a third-party retailer, along with existing balances on accounts with new advances, for an initial term ending in April 2020 and renewing through April 2022 at Bluestem's option. As of March 31, 2018 , the total unused credit available to customers was $3.7 billion . In 2017, the Company purchased $1.2 billion of receivables out of the $4.0 billion of unused credit available to customers at December 31, 2016. During the three months ended March 31, 2018 , the Company purchased $0.3 billion of receivables, out of the $3.9 billion unused credit available to customers as of December 31, 2017. In addition, SC purchased $17.4 million of receivables related to newly-opened customer accounts during the three months ended March 31, 2018 . Each customer account generated under the agreements generally is approved with a credit limit higher than the amount of the initial purchase, with each subsequent purchase automatically approved as long as it does not cause the account to exceed its limit and the customer is in good standing. As of March 31, 2018 and December 31, 2017 , SC was obligated to purchase $10.3 million and $11.5 million , respectively, in receivables that had been originated by the retailer but not yet purchased by SC. SC also is required to make a profit-sharing payment to the retailer each month if performance exceeds a specified return threshold. During the year ended December 31, 2015, SC and the third-party retailer executed an amendment that, among other provisions, increases the profit-sharing percentage retained by SC, gives the retailer the right to repurchase up to 9.99% of the existing portfolio at any time during the term of the agreement, and, provided that the repurchase right is exercised, gives the retailer the right to retain up to 20% of new accounts subsequently originated. Under terms of an application transfer agreement with an original equipment manufacturer (“OEM") other than FCA, SC has the first opportunity to review for its own portfolio any credit applications turned down by the OEM's captive finance company. The agreement does not require SC to originate any loans, but for each loan originated SC will pay the OEM a referral fee. In connection with the sale of RICs through securitizations and other sales, SC has made standard representations and warranties customary to the consumer finance industry. Violations of these representations and warranties may require SC to repurchase loans previously sold to on- or off-balance sheet Trusts or other third parties. As of March 31, 2018 , there were no loans that were the subject of a demand to repurchase or replace for breach of representations or warranties for SC's ABS or other sales. In the opinion of management, the potential exposure of other recourse obligations related to SC’s RIC sales agreements will not have a material adverse effect on SC’s consolidated financial position, results of operations, or cash flows. Santander has provided guarantees on the covenants, agreements, and obligations of SC under the governing documents of its warehouse facilities and privately issued amortizing notes. These guarantees are limited to the obligations of SC as servicer. Chrysler Agreement Under terms of the Chrysler Agreement, SC must make revenue sharing payments to FCA and also must make gain-sharing payments to FCA when residual gains on leased vehicles exceed a specified threshold. SC had accrued $11.6 million and $6.6 million at March 31, 2018 and December 31, 2017 , respectively, related to these obligations. The Chrysler Agreement requires, among other things, that SC bears the risk of loss on loans originated pursuant to the agreement, but also that FCA shares in any residual gains and losses from consumer leases. The agreement also requires that SC maintains at least $5.0 billion in funding available for dealer inventory financing and $4.5 billion of financing dedicated to FCA retail financing. In turn, FCA must provide designated minimum threshold percentages of its subvention business to SC. The Chrysler Agreement is subject to early termination in certain circumstances, including the failure by either party to comply with certain of its ongoing obligations under the agreement. These obligations include SC's meeting specified escalating penetration rates for the first five years of the agreement. SC has not met these penetration rates at March 31, 2018 . If the Chrysler Agreement were to terminate, there could be a materially adverse impact to our and SC's business financial condition and results of operations. Agreement with Bank of America Until January 31, 2017, SC had a flow agreement with Bank of America whereby SC was committed to sell up to $300.0 million of eligible loans to the bank each month. On October 27, 2016, Bank of America notified SC that it was terminating the flow agreement effective January 31, 2017 and, accordingly, the flow agreement has terminated. SC retains servicing on all sold loans and may receive or pay a servicer performance payment based on an agreed-upon formula if performance on the sold loans is better or worse, respectively, than expected performance at the time of sale. Servicer payments are due six years from the cut-off date of each loan sale. SC had accrued $7.5 million and $8.1 million at March 31, 2018 and December 31, 2017 , respectively, related to this obligation. NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) Agreement with Citizens Bank of Pennsylvania ("CBP") Until May 1, 2017, SC sold loans to CBP under terms of a flow agreement and predecessor sale agreements. Under the flow agreement, as amended, CBP's committed purchases of Chrysler Capital prime loans were a maximum of $200.0 million and a minimum of $50.0 million per quarter. SC retains servicing on the sold loans and will owe CBP a loss-sharing payment capped at 0.5% of the original pool balance if losses exceed a specified threshold, established on a pool-by-pool basis. Loss-sharing payments are due the month in which net losses exceed the established threshold of each loan sale. The Company had accrued $5.5 million and $5.6 million at March 31, 2018 and December 31, 2017 , respectively, related to this obligation. Other Agreements As of March 31, 2018 , SC was party to a forward flow asset sale agreement with a third party under the terms of which SC is committed to sell charged-off loan receivables in bankruptcy status on a quarterly basis until sales total at least $350.0 million . However, any sale of more than $275.0 million is subject to a market price check. As of March 31, 2018 and December 31, 2017 , the remaining aggregate commitments were $88.0 million and $98.9 million , respectively. Other Contingencies SC is or may be subject to potential liability under various other contingent exposures. SC had accrued $3.4 million and $6.3 million at March 31, 2018 and December 31, 2017 , respectively, for other miscellaneous contingencies. Impact from Hurricanes Our footprint was impacted by three significant hurricanes during the third quarter of 2017, Hurricane Harvey, which struck the State of Texas and the surrounding region, Hurricane Irma, which primarily struck the State of Florida, and Hurricane Maria, which struck the island of Puerto Rico. Each of these hurricanes resulted in widespread flooding, power outages and associated damage to real and personal property in the affected areas Our SC subsidiary, headquartered in Dallas, Texas, our BSI subsidiary, headquartered in Miami, Florida, and our Santander BanCorp, BSPR and SSLLC subsidiaries in Puerto Rico were most directly affected by these hurricanes. In Puerto Rico, there was significant damage to the infrastructure and the power grid on the entire island, which resulted in extended delays in BSPR returning to normal operations. The Company assessed the potential additional credit losses related to its consumer and commercial lending exposures in the greater Texas, Florida and Puerto Rico regions. As a result, the Company's ALLL had approximately $110 million of reserves at March 31, 2018 related to the hurricanes. However, for credit exposures in Puerto Rico, given the current state of the region, the Company has had limited information with which to estimate probable credit losses. As of March 31, 2018 , the Company has approximately $3.4 billion of loan exposures in Puerto Rico, consisting of $1.6 billion in consumer loans, $1.8 billion in commercial loans including $220 million in loans to municipalities. The Company will continue to monitor and assess the impact of these hurricanes on our subsidiaries’ businesses, and may establish additional reserves for losses in future periods. See discussion under the "Puerto Rico FINRA Arbitrations" section of Note 16 below for further discussion. Other Off-Balance Sheet Risk Other off-balance sheet risk stems from financial instruments that do not meet the definition of guarantees under applicable accounting guidance, and from other relationships that include items such as indemnifications provided in the ordinary course of business and intercompany guarantees. NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) Legal and Regulatory Proceedings Periodically, the Company is party to, or otherwise involved in, various lawsuits, investigations, regulatory matters and other legal proceedings that arise in the ordinary course of business. In view of the inherent difficulty of predicting the outcome of any such lawsuit, investigation, regulatory matter and/or legal proceeding, particularly where the claimants seek very large or indeterminate damages or where the matters present novel legal theories or involve a large number of parties, the Company generally cannot predict the eventual outcome of the pending matters, the timing of the ultimate resolution of the matters, or the eventual loss, fines or penalties related to the matter. Accordingly, except as provided below, the Company is unable to reasonably estimate a range of its potential exposure, if any, to these lawsuits, investigations, regulatory matters and other legal proceedings at this time. However, it is reasonably possible that actual outcomes or losses may differ materially from the Company's current assessments and estimates and any adverse resolution of any of these matters against it could have a material adverse effect on the Company's financial position, liquidity, and results of operations. In accordance with applicable accounting guidance, the Company establishes an accrued liability for litigation, investigation, regulatory matters and other legal proceedings when those matters present material loss contingencies that are both probable and estimable. In such cases, there may be an exposure to loss in excess of any amounts accrued. When a loss contingency is not both probable and estimable, the Company does not establish an accrued liability. As a litigation, investigation or regulatory matter develops, the Company, in conjunction with any outside counsel handling the matter, evaluates on an ongoing basis whether the matter presents a material loss contingency that is probable and estimable. If a determination is made during a given quarter that a material loss contingency is probable and estimable, an accrued liability is established during such quarter with respect to such loss contingency; the Company continues to monitor the matter for further developments that could affect the amount of the accrued liability previously established. As of March 31, 2018 and December 31, 2017 , the Company accrued aggregate legal and regulatory liabilities of $167.2 million and $161.8 million , respectively. Further, the Company estimates the aggregate range of reasonably possible losses for legal and regulatory proceedings in excess of reserves of up to $260 million and $255 million as of March 31, 2018 and December 31, 2017 , respectively. Descriptions of the material lawsuits, regulatory matters and other legal proceedings to which the Company is subject are set forth below. OCC Identity Theft Protection Product ("SIP") Matter On March 26, 2015, the Bank entered into a Cease and Desist Order (the "SIP Consent Order") with the OCC regarding identified deficiencies in SBNA's billing practices with regard to SIP, an identity theft protection product from the Bank's third party vendor. Pursuant to the SIP Consent Order, the Bank paid a civil monetary penalty ("CMP") of $6 million and agreed to remediate customers who paid for but may not have received certain benefits of SIP. Prior to entering into the SIP Consent Order, the Bank made $37.3 million in remediation payments to customers, representing the total amount paid for product enrollment. Subsequently, the Bank commenced a further review in order to remediate checking account customers who may have been charged an overdraft fee and credit card customers who may have been charged an over limit fee and/or finance charge related to SIP product fees. The approximate amount of the expected additional remediation is $5.2 million . The Bank is currently implementing the actions and remediation set forth in the Bank’s action plans to reimburse customers. CFPB Overdraft Coverage Consent Order On April 1, 2014 , the Bank received a civil investigative demand ("CID") from the CFPB requesting information and documents in connection with the Bank’s marketing to consumers of overdraft coverage for ATM and onetime debit card transactions through a third-party vendor. On July 14, 2016, the Bank entered into a consent order with the CFPB regarding these practices. Pursuant to the terms of the consent order, the Bank paid a CMP of $10.0 million and agreed to validate the elections made by customers who opted in to overdraft coverage for automated teller machine ("ATM") and onetime debit card transactions in connection with telemarketing by the third-party vendor. The Bank is also required to make certain changes to its third-party vendor oversight policy and its customer complaint policy. The Bank is currently implementing a remediation plan and working to meet the other consent order requirements. It is possible that additional litigation could be filed as a result of these issues. NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) Other Matters On July 2, 2015, the Company entered into a written agreement with the FRB of Boston. Under the terms of that written agreement, the Company is required to make enhancements with respect to, among other matters, Board oversight of the consolidated organization, risk management, capital planning and liquidity risk management. SC Matters Periodically, SC is party to, or otherwise involved in, various lawsuits and other legal proceedings that arise in the ordinary course of business. Securities Class Action and Shareholder Derivative Lawsuits Deka Lawsuit: SC is a defendant in a purported securities class action lawsuit (the "Deka Lawsuit") in the United States District Court, Northern District of Texas, captioned Deka Investment GmbH et al. v. Santander Consumer USA Holdings Inc. et al., No. 3:15-cv-2129-K. The Deka Lawsuit is against SC, certain of its current and former directors and executive officers and certain institutions that served as underwriters in SC's initial public offering (the "IPO") , including SIS, on behalf of a class consisting of those who purchased or otherwise acquired SC securities between January 23, 2014 and June 12, 2014. The amended class action complaint alleges, among other things, that the IPO registration statement and prospectus and certain subsequent public disclosures violated federal securities laws by containing misleading statements concerning SC’s ability to pay dividends and the adequacy of SC’s compliance systems and oversight. On December 18, 2015, SC and the individual defendants moved to dismiss the lawsuit, which was denied. On December 2, 2016, the plaintiffs moved to certify the proposed classes. On July 11, 2017, the court entered an order staying the Deka Lawsuit pending the resolution of the appeal of a class certification order in In re Cobalt Int’l Energy, Inc. Sec. Litig., No. H-14-3428, 2017 U.S. Dist. LEXIS 91938 (S.D. Tex. June 15, 2017). Feldman Lawsuit: On October 15, 2015 , a shareholder derivative complaint was filed in the Court of Chancery of the State of Delaware, captioned Feldman v. Jason A. Kulas, et al., C.A. No. 11614 (the "Feldman Lawsuit"). The Feldman Lawsuit names as defendants certain current and former members of SC’s Board of Directors, and names SC as a nominal defendant. The complaint alleges, among other things, that the current and former director defendants breached their fiduciary duties in connection with overseeing SC’s nonprime auto lending practices, resulting in harm to SC. The complaint seeks unspecified damages and equitable relief. On December 29, 2015, the Feldman Lawsuit was stayed pending the resolution of the Deka Lawsuit. Jackie888 Lawsuit: On September 27, 2016, a shareholder derivative complaint was filed in the Court of Chancery of the State of Delaware captioned Jackie888, Inc. v. Jason Kulas, et al., C.A. # 12775 (the "Jackie888 Lawsuit"). The Jackie888 Lawsuit names as defendants current and former members of SC’s Board of Directors, and names SC as a nominal defendant. The complaint alleges, among other things, that the defendants breached their fiduciary duties in connection with SC’s accounting practices and controls. The complaint seeks unspecified damages and equitable relief. On April 13, 2017, the Jackie888 Lawsuit was stayed pending the resolution of the Deka Lawsuit. Parmelee Lawsuits: Two purported securities class action lawsuits filed in March and April 2016 in the United States District Court, Northern District of Texas, were consolidated and are now captioned Parmelee v. Santander Consumer USA Holdings Inc. et al., No. 3:16-cv-783 (the "Parmelee Lawsuits"). The Parmelee Lawsuits were filed against SC and certain of its current and former directors and executive officers on behalf of a class consisting of all those who purchased or otherwise acquired SC securities between February 3, 2015 and March 15, 2016. The complaint alleges, among other things, that SC violated federal securities laws by making false or misleading statements, as well as failing to disclose material adverse facts, in its periodic reports filed under the Exchange Act and certain other public disclosures, in connection with, among other things, SC’s change in its methodology for estimating its ACL and the correction of such ACL for prior periods. On January 3, 2018, the court granted SC’s motion to dismiss the lawsuit as to defendant Ismail Dawood (SC’s former Chief Financial Officer) and denied the motion as to all other defendants. Consumer Lending Cases SC is also party to various lawsuits pending in federal and state courts alleging violations of state and federal consumer lending laws, including, without limitation, the Equal Credit Opportunity Act (the “ECOA”), the Fair Debt Collection Practices Act, the Fair Credit Reporting Act, Section 5 of the Federal Trade Commission Act, the Telephone Consumer Protection Act, the Truth in Lending Act, wrongful repossession laws, usury laws and laws related to unfair and deceptive acts or practices. In general, these cases seek damages and equitable and/or other relief. NOTE 16. COMMITMENTS, CONTINGENCIES AND GUARANTEES (continued) Regulatory Proceedings SC is party to, or is periodically otherwise involved in, reviews, investigations, examinations and proceedings (both formal and informal), and information-gathering requests, by government and self-regulatory agencies, including the Federal Reserve Bank of Boston (the "FRBB"), the CFPB, the Department of Justice (the “DOJ”), the SEC, the Federal Trade Commission and various state regulatory and enforcement agencies. Currently, such matters include, but are not limited to, the following: • SC received a civil subpoena from the DOJ under Financial Institutions Reform, Recovery and Enforcement Act, requesting the production of documents and communications that, among other things, relate to the underwriting and securitization of nonprime vehicle loans, and also from the SEC requesting the production of documents and communications that, among other things, relate to the underwriting and securitization of nonprime vehicle loans. SC has responded to these requests within the deadlines specified in the subpoenas and has otherwise cooperated with the DOJ and the SEC with respect to these matters. • In October 2014, May 2015, July 2015 and February 2017, SC received subpoenas and/or CIDs from the attorneys general of California, Illinois, Oregon, New Jersey, Maryland and Washington under the authority of each state's consumer protection statutes. SC has been informed that these states will serve as an executive committee on behalf of a group of 31 state Attorneys General. The subpoenas and/or CIDs from the executive committee states contain broad requests for information and the production of documents related to SC’s underwriting, securitization, servicing and collection of nonprime vehicle loans. SC has responded to these requests within the deadlines specified in the subpoenas and/or CIDs, and has otherwise cooperated with the Attorneys General with respect to this matter. • In February 2016, the CFPB issued a supervisory letter relating to its investigation of SC’s compliance systems, Board and senior management oversight, consumer complaint handling, marketing of guaranteed auto protection ("GAP") coverage and loan deferral disclosure practices. SC subsequently received a series of CIDs from the CFPB requesting information and testimony regarding SC’s marketing of GAP coverage and loan deferral disclosure practices. SC has responded to these requests within the deadlines specified in the CIDs, and has otherwise cooperated with the CFPB with respect to this matter. • In August 2017, SC received a CID from the CFPB. The stated purpose of the CID is to determine whether SC has complied with the Fair Credit Reporting Act and related regulations. SC has responded to these requests within the deadlines specified in the CID and has otherwise cooperated with the CFPB with respect to this matter. 2017 Written Agreement with the Federal Reserve On March 21, 2017, SC and SHUSA entered into a written agreement with the FRBB. Under the terms of that agreement, SC is required to enhance its compliance risk management program, board oversight of risk management and senior management oversight of risk management, and SHUSA is required to enhance its oversight of SC's management and operations. Mississippi Attorney General Lawsuit On January 10, 2017, the Attorney General of the State of Mississippi (the "Mississippi AG") filed a lawsuit against SC in the Chancery Court of the First Judicial District of Hinds County, State of Mississippi, captioned State of Mississippi ex rel. Jim Hood, Attorney General of the State of Mississippi v. Santander Consumer USA Inc., C.A. # G-2017-28. The complaint alleges that SC engaged in unfair and deceptive business practices to induce Mississippi consumers to apply for loans that they could not afford. The complaint asserts claims under the Mississippi Consumer Protection Act (the "MCPA") and seeks unspecified civil penalties, equitable relief and other relief. On March 31, 2017, SC filed motions to dismiss the Mississippi AG’s lawsuit, and subsequently filed a motion to stay the lawsuit pending the resolution of an interlocutory appeal relating to the MCPA before the Mississippi Supreme Court in Purdue Pharma, L.P., et al. v. State, No. 2017-I

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
RELATED PARTY TRANSACTIONS	RELATED PARTY TRANSACTIONS The Company has various debt agreements with Santander. For a listing of these debt agreements, see Note 10 to the Condensed Consolidated Financial Statements of the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . The Company and its affiliates also entered into or were subject to various service agreements with Santander and its affiliates. Each of these agreements was made in the ordinary course of business and on market terms. Contributions from Santander that impact common stock and paid in capital within the Condensed Consolidated Statements of Stockholder's Equity are disclosed within the table below: Three-Month Period Ended March 31, (in thousands) 2018 2017 Cash contribution $ 5,741 $ 9,000 Adjustment to book value of assets purchased on January 1 277 — Deferred tax asset on purchased assets 3,156 — Contribution from shareholder $ 9,174 $ 9,000 On January 1, 2018, the Company purchased certain assets and assumed certain liabilities of Produban Servicios Informaticos Generales S.L. and Ingenieria De Software Bancario S.L., both affiliates of Santander. The book value and fair value of the net assets acquired was $2.8 million and $15.3 million respectively. Related to this transaction, in 2017, the Company received a net capital contribution from Santander of $2.8 million , representing cash received of $15.3 million and a return of capital of $12.5 million for the difference between the fair value of the assets purchased and the book value on the balance sheets of the affiliates. The Companyre-evaluated the assets received on January 1, 2018 and recorded an additional $0.3 million to additional paid-in capital. The Company contributed these assets at book value of $3.1 million to SBNA, a subsidiary of the Company on January 1, 2018. During the first quarter of 2018, the Company recorded a $3.2 million deferred tax asset on the assets purchased by the Company to establish the intangible under Section 197 of the Internal Revenue Code. On March 29, 2017, SC entered into a Master Securities Purchase Agreement ("MSPA") with Santander, under which it has the option to sell a contractually determined amount of eligible prime loans to Santander, through the Santander Prime Auto Issuing Note Trust (“SPAIN") securitization platform, for a term ending in December 2018. SC will provide servicing on all loans originated under this arrangement. For the three months ended March 31, 2017, the Company sold $700 million of loans at fair value under this MSPA. The MSPA was amended in March 2018 and under this amended agreement, SC sold $1.5 billion of prime loans to Santander at fair value during the three months ended March 31, 2018 . Total losses of $16.9 million and $2.7 million were recognized for the three-months periods ended March 31, 2018 and March 31, 2017, respectively, which are included in Miscellaneous income, net in the Condensed Consolidated Statements of Operations. SC had $15.4 million and $13.0 million of collections due to Santander as of March 31, 2018 and December 31, 2017, respectively. Beginning in 2018, SC agreed to provide SBNA with origination support services in connection with the processing, underwriting, and purchase of RICs, primarily from Chrysler dealers. In addition, SC agreed to perform the servicing for any RICs originated on SBNA's behalf. During the three-month period ended March 31, 2018 , SC facilitated SBNA's purchase of $24 million of RICs. SC recognizes referral fee income and servicing fee income related to this agreement that eliminates in the consolidation of SHUSA.

BUSINESS SEGMENT INFORMATION

BUSINESS SEGMENT INFORMATION	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
BUSINESS SEGMENT INFORMATION	BUSINESS SEGMENT INFORMATION Business Segment Products and Services The Company’s reportable segments are focused principally around the customers the Company serves. During the first quarter of 2018, the Chief Operating Decision Maker ("CODM") made certain changes in its business lines that drove a reorganization of its business leadership to provide enhanced customer service to its clients and to better align management teams and resources with the manner in which the CODM allocates resources and assesses business performance. Accordingly, the following changes were made within the Company's reportable segments: • The Commercial Banking and the CRE reportable segments were combined into the Commercial Banking reportable segment. • SIS, a subsidiary of SHUSA, that was formerly located within the Other category was moved to the GCB reportable segment. • The Company's internal Funds Transfer Pricing ("FTP") methodologies and cost allocations were updated to align with Santander corporate criteria for internal management reporting. These FTP and cost allocation changes impact how certain costs are allocated for all reporting segments, excluding SC. All prior period results have been recast to conform to the new composition of reportable segments. The Company has identified the following reportable segments: • The Consumer and Business Banking segment includes the products and services provided to Bank customers through the Bank's branch locations, including consumer deposit, business banking, residential mortgage, unsecured lending and investment services. The branch locations offer a wide range of products and services to consumers and business banking customers, including demand and interest-bearing demand deposit accounts, money market and savings accounts, CDs and retirement savings products. The branch locations also offer lending products such as credit cards, home equity lines of credit, and business loans such as commercial lines of credit and business credit cards. In addition, the Bank provides investment services to its retail customers, including annuities, mutual funds, and insurance products. Santander Universities, which provides grants and scholarships to universities and colleges as a way to foster education through research, innovation and entrepreneurship, is the last component of this segment. • The Commercial Banking segment currently provides commercial lines, loans, and deposits to medium and large business banking customers as well as financing and deposits for government entities, commercial real estate loans and multifamily loans to customers, commercial loans to dealers and financing for equipment and commercial vehicles. This segment also provides financing and deposits for government entities and niche product financing for specific industries. • The GCB segment serves the needs of global commercial and institutional customers by leveraging the international footprint of Santander to provide financing and banking services to corporations with over $500 million in annual revenues. GCB also includes SIS, a registered broker-dealer located in New York that provides services in investment banking, institutional sales, and trading and offering research reports of Latin American and European equity and fixed income securities. GCB's offerings and strategy are based on Santander's local and global capabilities in wholesale banking. • SC is a specialized consumer finance company focused on vehicle finance and third-party servicing. SC’s primary business is the indirect origination of RICs, principally through manufacturer-franchised dealers in connection with their sale of new and used vehicles to retail consumers. In conjunction with a ten -year private label financing agreement with FCA that became effective May 1, 2013, SC offers a full spectrum of auto financing products and services to FCA customers and dealers under the Chrysler Capital brand. These products and services include consumer RICs and leases, as well as dealer loans for inventory, construction, real estate, working capital and revolving lines of credit. SC also originates vehicle loans through a web-based direct lending program, purchases vehicle RICs from other lenders, and services automobile, recreational and marine vehicle portfolios for other lenders. During 2015, SC announced its intention to exit the personal lending business. SC has entered into a number of intercompany agreements with the Bank as described above as part of the Other segment. All intercompany revenue and fees between the Bank and SC are eliminated in the consolidated results of the Company. The Other category includes certain immaterial subsidiaries such as BSI, BSPR, SSLLC, and SFS, the unallocated interest expense on the Company's borrowings and other debt obligations and certain unallocated corporate income and indirect expenses. NOTE 18. BUSINESS SEGMENT INFORMATION (continued) The Company’s segment results, excluding SC and the entities that have become part of the IHC, are derived from the Company’s business unit profitability reporting system by specifically attributing managed balance sheet assets, deposits and other liabilities and their related interest income or expense to each of the segments. FTP methodologies are utilized to allocate a cost for funds used or a credit for funds provided to business line deposits, loans and selected other assets using a matched funding concept. The methodology includes a liquidity premium adjustment, which considers an appropriate market participant spread for commercial loans and deposits by analyzing the mix of borrowings available to the Company with comparable maturity periods. Other income and expenses are managed directly by each reportable segment, including fees, service charges, salaries and benefits, and other direct expenses, as well as certain allocated corporate expenses, and are accounted for within each segment’s financial results. Accounting policies for the lines of business are the same as those used in preparation of the Condensed Consolidated Financial Statements with respect to activities specifically attributable to each business line. However, the preparation of business line results requires management to establish methodologies to allocate funding costs and benefits, expenses and other financial elements to each line of business. Where practical, the results are adjusted to present consistent methodologies for the segments. The application and development of management reporting methodologies is a dynamic process and is subject to periodic enhancements. The implementation of these enhancements to the internal management reporting methodology may materially affect the results disclosed for each segment with no impact on consolidated results. Whenever significant changes to management reporting methodologies take place, prior period information is reclassified wherever practicable. The CODM, manages SC on a historical basis by reviewing the results of SC on a pre-Change in Control basis. The Results of Segments table discloses SC's operating information on the same basis that it is reviewed by the CODM. The adjustments column includes adjustments to reconcile SC's GAAP results to SHUSA's consolidated results. Results of Segments The following tables present certain information regarding the Company’s segments. For the Three-Month Period Ended SHUSA Reportable Segments March 31, 2018 Consumer & Business Banking Commercial Banking GCB Other (2) SC (3) SC Purchase Price Adjustments (4) Eliminations (4) Total (in thousands) Net interest income $ 304,819 $ 154,935 $ 32,690 $ 62,816 $ 921,737 $ 9,895 $ 9,058 $ 1,495,950 Total non-interest income 82,819 33,588 50,639 113,424 531,736 2,686 (11,528 ) 803,364 Provision for / (release of) credit losses 38,389 (9,741 ) (2,055 ) 6,337 458,995 10,609 — 502,534 Total expenses 368,639 84,396 58,143 228,368 694,870 11,729 (2,621 ) 1,443,524 Income/(loss) before income taxes (19,390 ) 113,868 27,241 (58,465 ) 299,608 (9,757 ) 151 353,256 Intersegment revenue/(expense) (1) 678 1,531 (2,281 ) 72 — — — — Total assets 18,857,164 24,318,734 7,062,542 38,944,263 40,045,188 — — 129,227,891 (1) Intersegment revenue/(expense) represents charges or credits for funds used or provided by each of the segments and is included in net interest income. (2) Other includes the results of the entities transferred to the IHC, earnings from non-strategic assets, the investment portfolio, interest expense on the Bank’s and the Company's borrowings and other debt obligations, amortization of intangible assets and certain unallocated corporate income and indirect expenses. (3) Management of SHUSA manages SC by analyzing the pre-Change in Control results of SC as disclosed in this column. (4) Purchase Price Adjustments represents the impact that SC purchase marks had on the results of SC included within the consolidated operations of SHUSA, while eliminations eliminate intercompany transactions. NOTE 18. BUSINESS SEGMENT INFORMATION (continued) For the Three-Month Period Ended SHUSA Reportable Segments March 31, 2017 Consumer & Business Banking Commercial Banking GCB Other (2) SC (3) SC Purchase Price Adjustments (4) Eliminations (4) Total (in thousands) Net interest income $ 262,732 $ 152,306 $ 42,228 $ 56,728 $ 1,042,925 $ 37,305 $ 8,341 $ 1,602,565 Total non-interest income 82,534 14,923 51,336 151,107 434,848 5,454 (11,784 ) 728,418 Provision for / (release of) credit losses 22,451 5,386 (1,364 ) 15,610 635,013 58,349 — 735,445 Total expenses 375,021 78,339 46,608 226,034 621,334 11,872 (6,316 ) 1,352,892 Income/(loss) before income taxes (52,206 ) 83,504 48,320 (33,809 ) 221,426 (27,462 ) 2,873 242,646 Intersegment revenue/(expense) (1) 878 1,301 (2,397 ) 218 — — — — Total assets 17,680,926 25,854,624 9,717,228 43,776,451 39,061,940 — — 136,091,169 (1) Intersegment revenue/(expense) represents charges or credits for funds used or provided by each of the segments and is included in net interest income. (2) Other includes the results of the entities transferred to the IHC, earnings from non-strategic assets, the investment portfolio, interest expense on the Bank’s and the Company's borrowings and other debt obligations, amortization of intangible assets and certain unallocated corporate income and indirect expenses. (3) Management of SHUSA manages SC by analyzing the pre-Change in Control results of SC as disclosed in this column. (4) Purchase Price Adjustments represents the impact that SC purchase marks had on the results of SC included within the consolidated operations of SHUSA, while eliminations eliminate intercompany transactions.

BASIS OF PRESENTATION AND ACC29

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation These Condensed Consolidated Financial Statements include the assets, liabilities, revenues and expenses accounts of the Company and its consolidated subsidiaries, including the Bank, SC, and certain special purpose financing trusts utilized in financing transactions that are considered VIEs. The Company generally consolidates VIEs for which it is deemed to be the primary beneficiary and generally consolidates voting interest entities ("VOEs") in which the Company has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. These Consolidated Financial Statements have been prepared by the Company pursuant to Securities and Exchange Commission ("SEC") regulations. Additionally, where applicable, the Company's accounting policies conform to the accounting and reporting guidelines prescribed by bank regulatory authorities. In the opinion of management, the accompanying Condensed Consolidated Financial Statements reflect all adjustments of a normal and recurring nature necessary for a fair statement of the Consolidated Balance Sheets, Statements of Operations, Statements of Comprehensive Income, Statements of Stockholder's Equity and Statements of Cash Flows ("SCF") for the periods indicated, and contain adequate disclosure for the fair statement of this interim financial information.
Recently Adopted Accounting Policies and Recent Accounting Developments	Recently Adopted Accounting Standards Since January 1, 2018, the Company adopted the following Financial Accounting Standards Board ("FASB") Accounting Standards Updates (“ASUs"): • ASU 2014-09, Revenue from Contracts with Customers (Topic 606), as amended . This ASU requires an entity to recognize revenue for the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. It includes a five-step process to assist an entity in achieving the main principles of revenue recognition under ASC 606. Because the ASU does not apply to revenue associated with leases and financial instruments (including loans, securities, and derivatives), it did not have a material impact on the elements of the Company's Consolidated Statements of Operations most closely associated with leases and financial instruments (such as interest income, interest expense and securities gains and losses). The Company adopted this ASU as of January 1, 2018 using the modified retrospective method of transition, resulting in an immaterial cumulative-effect adjustment recorded to opening retained earnings for the current period. The adoption of this ASU did not result in material changes in the timing of the Company's revenue recognition, but requires gross presentation of certain costs previously offset against revenue. This change in presentation is reflected in the current period and will increase both noninterest revenue and noninterest expense for the Company. The increase is predominantly associated with certain distribution costs on wealth management products (historically offset against Miscellaneous income), with the remainder of the increase associated with certain underwriting service costs (historically offset against Miscellaneous income). Refer to Note 15 for additional details. Results for reporting periods beginning after January 1, 2018 are presented under the new revenue recognition standard, while prior period amounts have not been adjusted and continue to be reported in accordance with our historic accounting. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) The cumulative-effect of the changes made to our January 1, 2018 Condensed Consolidated Balance Sheet for the adoption of the new revenue recognition standard were as follows: (in thousands) Balance at December 31, 2017 Adjustments Balance at January 1, 2018 Assets - LHFI $ 80,740,852 $ 5,514 $ 80,746,366 Other assets 3,632,427 (3,592 ) 3,628,835 Total Assets 128,294,030 1,922 128,295,952 Liabilities - Other liabilities 799,403 (1,378 ) 798,025 Total Liabilities 104,588,399 (1,378 ) 104,587,021 Stockholders' Equity - Retained earnings 3,462,674 3,300 3,465,974 Total Stockholders' Equity 23,705,631 3,300 23,708,931 The following discloses the impact on the Company's Condensed Balance Sheet at March 31, 2018 and the Condensed Statement of Operations for the three-months ended March 31, 2018 for the adoption of this new accounting standard: March 31, 2018 (in thousands) As Reported Balance Without Adoption Assets - LHFI $ 80,118,328 $ 80,113,022 Other assets 3,994,748 3,998,267 Total assets 129,227,891 129,226,104 Liabilities - Other liabilities 996,685 998,063 Total Liabilities 105,384,810 105,386,188 Stockholders' Equity - Retained earnings 3,685,111 3,681,946 Total Stockholders' Equity 23,843,081 23,839,916 Three-Month Period Ended March 31, 2018 (in thousands) As Reported Balance Without Adoption Non-interest income Consumer and commercial fees $ 138,561 $ 137,893 Miscellaneous income/(loss) 124,570 118,882 Total non-interest income 803,364 797,008 General and administrative expense Technology, outside service, and marketing expense 152,282 150,111 Loan expense 96,814 99,193 Other administrative expenses 103,554 96,782 Total general and administrative expenses 1,405,662 1,399,098 Income before income tax provision 353,256 353,464 Income tax provision 95,321 95,394 Net income $ 257,935 $ 258,070 NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) • ASU 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, as amended. This new guidance amends the presentation and accounting for certain financial instruments, including liabilities measured at fair value under the FVO and equity investments. The guidance also updates fair value presentation and disclosure requirements for financial instruments measured at amortized cost. The Company adopted this standard on January 1, 2018, and it did not have a material impact on the Company's financial position or results of operations. As a result of the adoption of this standard, the Company reclassified approximately $10.0 million of equity securities from Investments AFS to Other Investments on January 1, 2018. Future changes in the fair value of the Company's equity securities will be recognized in the Condensed Consolidated Statements of Operations rather than Other comprehensive Income. • ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities. This new guidance amends the hedge accounting model to enable entities to better portray their risk management activities in their financial statements. The amendments expand an entity’s ability to hedge nonfinancial and financial risk components and reduce complexity in hedges of interest rate risk. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness, and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line in which the earnings effect of the hedged item is reported. The new guidance is effective for public companies for fiscal years beginning after December 15, 2018, with early adoption, including adoption in an interim period, permitted. The Company adopted this standard in the first quarter of 2018. It did not have a material impact on the opening balance of retained earnings for the cumulative-effect adjustment related to eliminating the separate measurement of ineffectiveness. Refer to Note 12 for further discussion of the Company's derivatives. • ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this ASU allow a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cut and Jobs Act of 2017 (the “TCJA"). As a result of adoption of this ASU in the first quarter of 2018, the Company reclassified $39.1 million from accumulated other comprehensive income with an offsetting credit to retained earnings. Cumulative net impact to opening Retained earnings As a result of the adoption of the new accounting standards outlined above, the Company recorded a cumulative net increase to opening Retained earnings of $42.0 million . Those impacts were attributed to the following ASUs adopted during the period: Impact to Retained earnings (in thousands) Adoption of ASU 2014-09, Revenue Recognition $ 3,300 Adoption of ASU 2016-1, Financial Instruments (418 ) Adoption of ASU 2018-02, Statement of Comprehensive Income 39,094 Cumulative-effect adjustment upon adoption of new accounting standards $ 41,976 Other adjustments at subsidiary 5,573 Net impact to opening Retained earnings $ 47,549 The adoption of the following ASUs did not have an impact on the Company's financial position or results of operations: • ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments • ASU 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory • ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash (A consensus of the FASB Emerging Issues Task Force) • ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business • ASU 2017-05, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets • ASU 2017-07, Compensation - Retirement Benefits (Topic 715): Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost • ASU 2017-09 , Compensation-Stock Compensation (Topic 718): Scope of Modification Accounting • ASU 2018-05, Income Taxes (Topic 740): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118 NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) As required by the adoption of ASU 2016-18 and ASU 2014-09, the following additional accounting policy disclosures are required for the nature of cash restrictions, and revenue recognized from contracts with customers from disclosures included in our Annual Report on Form 10-K for the year ended December 31, 2017: Cash, Cash Equivalents, and Restricted Cash Cash deposited to support securitization transactions, lockbox collections, and related required reserve accounts are recorded in the Company's Consolidated Balance Sheets as Restricted cash. Excess cash flows generated by Trusts are added to the restricted cash reserve account, creating additional over-collateralization until the contractual securitization requirement has been reached. Once the targeted reserve requirement is satisfied, additional excess cash flows generated by the Trusts are released to the Company as distributions from the Trusts. Lockbox collections are added to restricted cash and released when transferred to the appropriate warehouse line of credit or trust. The Company also maintains restricted cash primarily related to cash posted as collateral related to derivative agreements, cash restricted for investment purposes and cash advanced for loan purchases. Revenue Recognized from Contracts with Customers Depository services Depository services are performed under an agreement with a customer, and those services include: personal deposit account opening and maintaining, checking service, online banking service, debit card services, etc. Depository service fees related to customer deposits can generally be distinguished between monthly service fees and transactional fees within the single performance obligation of providing depository account services. Monthly account service and maintenance fees are provided over a period of time (usually a month), and revenue is recognized as the Company performs the service (usually at the end of the month). The services for transactional fees are performed at a point in time and revenue is recognized when the transaction occurs. Commissions and trailer fees Commission fees are earned from the selling of annuity contracts to customers on behalf of insurance companies, acting as the broker for certain equity trading, and sales of interests in mutual funds. The Company elected the expected value method for estimating commission fees, due to the large number of customer contracts with similar characteristics. However, commissions and trailer fees are fully constrained as the Company cannot sufficiently estimate the consideration to which it could be entitled to earn. Commissions are generally associated with point-in-time transactions or agreements that are one year or less. The performance obligation is satisfied immediately and revenue is recognized as the Company performs the service. Interchange income, net The Company has entered into agreements with payment networks, in which the Company will issue the payment network's credit card as part of the Company's credit card portfolio. Each time a cardholder makes a purchase at a merchant and the transaction is processed, the Company receives an interchange fee in exchange for the authorization and settlement services provided to the payment networks. The performance obligation for the Company is to provide authorization and settlement services to the payment network when the payment network submits a transaction for authorization. The Company considers the payment network to be the customer, and the Company is acting as a principal when performing the transaction authorization and settlement services. The performance obligation for authorization and settlement services is satisfied at point in time and revenue is recognized on the date when the Company authorizes and routes the payment to the merchant. The expenses paid to payment networks are accounted for as considerations payable to the customer and therefore reduce the transaction price. Therefore, interchange income is recorded net against the expenses paid to the payment network and the cost of rewards programs. The agreements also contain immaterial fixed consideration related to upfront sign-on bonuses and program development bonuses, which are amortized over the remainder of the agreement's life on a straight-line basis. NOTE 1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES (continued) Underwriting service fees SIS, as a registered broker-dealer, performs underwriting services by raising investment capital from investors on behalf of corporations that are issuing securities. Underwriting services have one performance obligation, which is satisfied on the day SIS purchases the securities. Underwriting services include multiple parties in delivering the performance obligation. The Company has evaluated whether it is the principal or agent when we provide underwriting services. The Company acts as the principal when performing underwriting services, and recognizes fees on a gross basis. Revenue is recorded as the difference between the price the Company pays the issuer of the securities and the public offering price, and expenses are recorded as the proportionate share of the underwriting costs incurred by SIS. The Company is the principal because we obtain control of the services provided by third-party vendors and combine them with other services as part of delivering on the underwriting service. Asset and wealth management fees Asset and wealth management fees includes fee income generated from discretionary investment management and non-discretionary investment advisory contracts with customers. Discretionary investment management fees are earned when the Company performs the administration and management of a customer’s account. The transaction price includes variable consideration, however there is uncertainty associated with accurately estimating revenue to be earned in the future. The Company earns and recognizes investment management fees on a quarterly basis based on the average assets under management. Non-discretionary investment advisory fees are earned when the Company provides investment advisory services to customers, such as recommending the rebalancing or restructuring of the securities in the Customer’s account. The transaction price for investment advisory fees includes both fixed consideration, in the form of a minimum annual fee, and variable consideration dependent on the average assets under management, calculated similarly to investment management fees above. The Company earns investment advisory fees on a quarterly basis based on the minimum annual fee and the average assets under management. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842). The guidance, as amended, in this update supersedes the current lease accounting guidance for both lessees and lessors under ASC 840, Leases. The new guidance requires lessees to evaluate whether a lease is a finance lease using criteria similar to what lessees use today to determine whether they have a capital lease. Leases not classified as finance leases are classified as operating leases. This classification will determine whether the lease expense is recognized based on an effective interest method or on a straight-line basis over the term of the lease. The lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similarly to today’s guidance for operating leases. The new guidance will require lessors to account for leases using an approach that is substantially similar to the existing guidance. This new guidance will be effective for the Company for the first reporting period beginning after December 15, 2018, with earlier adoption permitted. The Company does not intend to early adopt this ASU. Adoption of this amendment must be applied on a modified retrospective approach. The Company is in the process of reviewing our existing property and equipment lease contracts, as well as service contracts that may include embedded leases. Upon adoption, the Company expects to report higher assets and liabilities from recording the present value of the future minimum lease payments of the leases. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments . This new guidance significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The standard will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For AFS debt securities, entities will be required to record allowances rather than reduce the carrying amount, as they do today under the other-than-temporary impairment (“OTTI') model. The standard also simplifies the accounting model for purchased credit-impaired debt securities and loans. The new guidance will be effective for the Company for the first reporting period beginning after December 15, 2019, with earlier adoption permitted. Adoption of this new guidance can be applied only on a prospective basis as a cumulative-effect adjustment to retained earnings. The Company is currently evaluating the impact of the new guidance on its Consolidated Financial Statements. It is expected that the new model will include different assumptions used in calculating credit losses, such as estimating losses over the estimated life NOTE 2. RECENT ACCOUNTING DEVELOPMENTS (continued) of a financial asset, and will consider expected future changes in macroeconomic conditions. The adoption of this ASU may result in an increase to the Company’s allowance for credit losses ("ACL"), which will depend upon the nature and characteristics of the Company's portfolio at the adoption date, as well as the macroeconomic conditions and forecasts at that date. The Company currently does not intend to early adopt this new guidance. In addition to those described in detail above, the Company is in the process of evaluating the following ASUs, and does not expect them to have a material impact on the Company's financial position, results of operations, or disclosures: • ASU 2017-06, Plan Accounting: Defined Benefit Pension Plans (Topic 960), Defined Contribution Pension Plans (Topic 962), Health and Welfare Benefit Plans (Topic 965): Employee Benefit Plan Master Trust Reporting (a consensus of the Emerging Issues Task Force) • ASU 2017-08, Receivables - Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities • ASU 2017-11, Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception
Commercial Lending Asset Quality Indicators	Commercial Lending Asset Quality Indicators Commercial credit quality disaggregated by class of financing receivables is summarized according to standard regulatory classifications as follows: PASS. Asset is well-protected by the current net worth and paying capacity of the obligor or guarantors, if any, or by the fair value less costs to acquire and sell any underlying collateral in a timely manner. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) SPECIAL MENTION. Asset has potential weaknesses that deserve management’s close attention, which, if left uncorrected, may result in deterioration of the repayment prospects for an asset at some future date. Special mention assets are not adversely classified. SUBSTANDARD. Asset is inadequately protected by the current net worth and paying capacity of the obligor or by the collateral pledged, if any. A well-defined weakness or weaknesses exist that jeopardize the liquidation of the debt. The loans are characterized by the distinct possibility that the Company will sustain some loss if deficiencies are not corrected. DOUBTFUL. Exhibits the inherent weaknesses of a substandard credit. Additional characteristics exist that make collection or liquidation in full highly questionable and improbable, on the basis of currently known facts, conditions and values. Possibility of loss is extremely high, but because of certain important and reasonable specific pending factors which may work to the advantage and strengthening of the credit, an estimated loss cannot yet be determined. LOSS. Credit is considered uncollectible and of such little value that it does not warrant consideration as an active asset. There may be some recovery or salvage value, but there is doubt as to whether, how much or when the recovery would occur.
Troubled Debt Restructurings	Commercial Loan TDRs All of the Company’s commercial loan modifications are based on the circumstances of the individual customer, including specific customers' complete relationships with the Company. Loan terms are modified to meet each borrower’s specific circumstances at a point in time and may allow for modifications such as term extensions and interest rate reductions. Modifications for commercial loan TDRs generally, although not always, result in bifurcation of the original loan into A and B notes. The A note is restructured to allow for upgraded risk rating and return to accrual status after a sustained period of payment performance has been achieved (typically six months for monthly payment schedules). The B note, if any, is structured as a deficiency note; the balance is charged off but the debt is usually not forgiven. Commercial TDRs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically six months for a monthly amortizing loan). TDRs are subject to analysis for specific reserves by either calculating the present value of expected future cash flows or, if collateral-dependent, calculating the fair value of the collateral less its estimated cost to sell. The TDR classification will remain on the loan until it is paid in full or liquidated. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Consumer Loan TDRs The primary modification program for the Company’s residential mortgage and home equity portfolios is a proprietary program designed to keep customers in their homes and, when appropriate, prevent them from entering into foreclosure. The program is available to all customers facing a financial hardship regardless of their delinquency status. The main goal of the modification program is to review the customer’s entire financial condition to ensure that the proposed modified payment solution is affordable according to a specific debt-to-income (“DTI") ratio range. The main modification benefits of the program allow for term extensions, interest rate reductions, and/or deferment of principal. The Company reviews each customer on a case-by-case basis to determine which benefit or combination of benefits will be offered to achieve the target DTI range. For the Company’s other consumer portfolios, including RICs and auto loans, the terms of the modifications generally include one or a combination of: a reduction of the stated interest rate of the loan to a rate of interest lower than the current market rate for new debt with similar risk, an extension of the maturity date or principal forgiveness. Consumer TDRs excluding RICs are generally placed on non-accrual status until the Company believes repayment under the revised terms is reasonably assured and a sustained period of repayment performance has been achieved (typically six months for a monthly amortizing loan). Any loan that has remained current for the six months immediately prior to modification will remain on accrual status after the modification is implemented. RIC TDRs are placed on nonaccrual status when the Company believes repayment under the revised terms is not reasonably assured, and considered for return to accrual when a sustained period of repayment performance has been achieved. The TDR classification will remain on the loan until it is paid in full or liquidated. In addition to loans identified as TDRs above, the guidance also requires loans discharged under Chapter 7 bankruptcy proceedings to be considered TDRs and collateral-dependent, regardless of delinquency status. TDRs that are collateral-dependent loans must be written down to the fair market value of the collateral, less costs to sell and classified as non-accrual/non-performing loans (“NPLs") for the remaining life of the loan. TDR Impact to ALLL The ALLL is established to recognize losses inherent in funded loans intended to be HFI that are probable and can be reasonably estimated. Prior to loans being placed in TDR status, the Company generally measures its allowance under a loss contingency methodology in which consumer loans with similar risk characteristics are pooled and loss experience information is monitored for credit risk and deterioration with statistical tools considering factors such as delinquency, LTV and credit scores. Upon TDR modification, the Company generally measures impairment based on a present value of expected future cash flows methodology considering all available evidence, by discounting expected future cash flows using the original effective interest rate or fair value of collateral less costs to sell. The amount of the required ALLL is equal to the difference between the loan’s impaired value and the recorded investment. RIC TDRs that subsequently default continue to have impairment measured based on the difference between the recorded investment of the RIC and the present value of expected cash flows. For the Company's other consumer TDR portfolios, impairment on subsequent defaults is generally measured based on the fair value of the collateral, if applicable, less its estimated cost to sell. Typically, commercial loans whose terms are modified in a TDR will have been identified as impaired prior to modification and accounted for generally using a present value of expected future cash flows methodology, unless the loan is considered collateral-dependent. Loans considered collateral-dependent are measured for impairment based on their fair values of collateral less estimated cost to sell. Accordingly, upon TDR modification or if a TDR modification subsequently defaults, the allowance methodology remains unchanged.

BASIS OF PRESENTATION AND ACC30

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Those impacts were attributed to the following ASUs adopted during the period: Impact to Retained earnings (in thousands) Adoption of ASU 2014-09, Revenue Recognition $ 3,300 Adoption of ASU 2016-1, Financial Instruments (418 ) Adoption of ASU 2018-02, Statement of Comprehensive Income 39,094 Cumulative-effect adjustment upon adoption of new accounting standards $ 41,976 Other adjustments at subsidiary 5,573 Net impact to opening Retained earnings $ 47,549 The cumulative-effect of the changes made to our January 1, 2018 Condensed Consolidated Balance Sheet for the adoption of the new revenue recognition standard were as follows: (in thousands) Balance at December 31, 2017 Adjustments Balance at January 1, 2018 Assets - LHFI $ 80,740,852 $ 5,514 $ 80,746,366 Other assets 3,632,427 (3,592 ) 3,628,835 Total Assets 128,294,030 1,922 128,295,952 Liabilities - Other liabilities 799,403 (1,378 ) 798,025 Total Liabilities 104,588,399 (1,378 ) 104,587,021 Stockholders' Equity - Retained earnings 3,462,674 3,300 3,465,974 Total Stockholders' Equity 23,705,631 3,300 23,708,931 The following discloses the impact on the Company's Condensed Balance Sheet at March 31, 2018 and the Condensed Statement of Operations for the three-months ended March 31, 2018 for the adoption of this new accounting standard: March 31, 2018 (in thousands) As Reported Balance Without Adoption Assets - LHFI $ 80,118,328 $ 80,113,022 Other assets 3,994,748 3,998,267 Total assets 129,227,891 129,226,104 Liabilities - Other liabilities 996,685 998,063 Total Liabilities 105,384,810 105,386,188 Stockholders' Equity - Retained earnings 3,685,111 3,681,946 Total Stockholders' Equity 23,843,081 23,839,916 Three-Month Period Ended March 31, 2018 (in thousands) As Reported Balance Without Adoption Non-interest income Consumer and commercial fees $ 138,561 $ 137,893 Miscellaneous income/(loss) 124,570 118,882 Total non-interest income 803,364 797,008 General and administrative expense Technology, outside service, and marketing expense 152,282 150,111 Loan expense 96,814 99,193 Other administrative expenses 103,554 96,782 Total general and administrative expenses 1,405,662 1,399,098 Income before income tax provision 353,256 353,464 Income tax provision 95,321 95,394 Net income $ 257,935 $ 258,070

INVESTMENT SECURITIES (Tables)

INVESTMENT SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract]
Summary of Debt Securities, Available-for-sale	The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of debt securities AFS at the dates indicated: March 31, 2018 December 31, 2017 (in thousands) Amortized Gross Gross Fair Amortized Gross Gross Fair U.S. Treasury securities $ 1,388,611 $ 4 $ (13,510 ) $ 1,375,105 $ 1,006,219 $ — $ (8,107 ) $ 998,112 Corporate debt securities 2,722 1 — 2,723 11,639 21 — 11,660 Asset-backed securities (“ABS”) 482,770 6,341 (1,879 ) 487,232 501,575 6,901 (1,314 ) 507,162 Equity securities (1) — — — — 11,428 — (614 ) 10,814 State and municipal securities 21 — — 21 23 — — 23 Mortgage-backed securities (“MBS”): GNMA - Residential 3,999,258 5,022 (99,197 ) 3,905,083 4,745,998 3,531 (62,524 ) 4,687,005 GNMA - Commercial 895,577 82 (17,192 ) 878,467 1,377,449 179 (19,917 ) 1,357,711 FHLMC and FNMA - Residential 6,879,034 417 (228,635 ) 6,650,816 6,958,433 1,093 (141,393 ) 6,818,133 FHLMC and FNMA - Commercial 22,840 — (693 ) 22,147 23,003 — (440 ) 22,563 Total investments in debt securities AFS $ 13,670,833 $ 11,867 $ (361,106 ) $ 13,321,594 $ 14,635,767 $ 11,725 $ (234,309 ) $ 14,413,183 (1) Reflects the reclassification of the Company's investments in equity securities to Other investments as a result of the adoption of ASU 2016-01 as of January 1, 2018.
Summary of Held-to-maturity Securities	The following tables present the amortized cost, gross unrealized gains and losses and approximate fair values of debt securities HTM at the dates indicated: March 31, 2018 December 31, 2017 (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Loss Fair Value Amortized Gross Gross Fair MBS: GNMA - Residential $ 1,947,672 $ — $ (62,258 ) $ 1,885,414 $ 1,447,669 $ 722 $ (26,150 ) $ 1,422,241 GNMA - Commercial 929,685 — (17,401 ) 912,284 352,139 325 (767 ) 351,697 Total investments in debt securities HTM $ 2,877,357 $ — $ (79,659 ) $ 2,797,698 $ 1,799,808 $ 1,047 $ (26,917 ) $ 1,773,938
Investments Classified by Contractual Maturity Date	Contractual maturities of the Company’s debt securities AFS at March 31, 2018 were as follows: (in thousands) Amortized Cost Fair Value Due within one year $ 540,050 $ 539,712 Due after 1 year but within 5 years 1,214,394 1,207,322 Due after 5 years but within 10 years 169,152 165,500 Due after 10 years 11,747,237 11,409,060 Total $ 13,670,833 $ 13,321,594 Contractual maturities of the Company’s debt securities HTM at March 31, 2018 were as follows: (in thousands) Amortized Cost Fair Value Due within one year $ — $ — Due after 1 year but within 5 years — — Due after 5 years but within 10 years — — Due after 10 years $ 2,877,357 $ 2,797,698 Total $ 2,877,357 $ 2,797,698
Gross Unrealized Loss and Fair Value of Debt Securities Available-for-Sale	The following tables present the aggregate amount of unrealized losses as of March 31, 2018 and December 31, 2017 on securities in the Company’s AFS investment portfolios classified according to the amount of time those securities have been in a continuous loss position: March 31, 2018 December 31, 2017 Less than 12 months 12 months or longer Less than 12 months 12 months or longer (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Fair Value Unrealized U.S. Treasury securities $ 1,097,855 $ (8,900 ) $ 247,265 $ (4,610 ) $ 998,112 $ (8,107 ) $ — $ — Corporate debt securities 1,086 — 13 — — — — — ABS 46,388 (260 ) 92,232 (1,619 ) 8,013 (125 ) 103,559 (1,189 ) Equity securities (1) — — — — 335 (2 ) 10,398 (612 ) MBS: GNMA - Residential 1,246,568 (28,253 ) 1,807,860 (70,944 ) 1,236,716 (8,600 ) 2,583,955 (53,924 ) GNMA - Commercial 817,989 (16,664 ) 34,670 (528 ) 1,022,452 (11,492 ) 251,209 (8,425 ) FHLMC and FNMA - Residential 3,703,742 (81,349 ) 2,846,957 (147,286 ) 3,429,678 (32,899 ) 3,017,533 (108,494 ) FHLMC and FNMA - Commercial 6,772 (238 ) 15,375 (455 ) 6,948 (103 ) 15,614 (337 ) Total investments in debt securities AFS $ 6,920,400 $ (135,664 ) $ 5,044,372 $ (225,442 ) $ 6,702,254 $ (61,328 ) $ 5,982,268 $ (172,981 ) (1) Reflects the reclassification of the Company's investments in equity securities to Other investments as a result of the adoption of ASU 2016-01 as of January 1, 2018.
Gross Unrealized Loss and Fair Value of Debt Securities Held-to-maturity	The following tables present the aggregate amount of unrealized losses as of March 31, 2018 and December 31, 2017 on debt securities in the Company’s held-to-maturity investment portfolios classified according to the amount of time those securities have been in a continuous loss position: March 31, 2018 December 31, 2017 Less than 12 months 12 months or longer Less than 12 months 12 months or longer (in thousands) Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Fair Value Unrealized MBS: GNMA - Residential $ 642,688 $ (20,624 ) $ 1,242,725 $ (41,634 ) $ 434,322 $ (6,419 ) $ 739,612 $ (19,731 ) GNMA - Commercial 624,936 (13,073 ) 287,348 (4,328 ) 118,951 (767 ) — — Total investments in debt securities HTM $ 1,267,624 $ (33,697 ) $ 1,530,073 $ (45,962 ) $ 553,273 $ (7,186 ) $ 739,612 $ (19,731 )
Gains (Losses) and Proceeds on Sales of Securities	Proceeds from sales of investments in debt securities and the realized gross gains and losses from those sales are as follows: Three-Month Period Ended March 31, (in thousands) 2018 2017 Proceeds from the sales of debt securities AFS $ 39,446 $ — Gross realized gains $ — $ — Gross realized losses (18 ) — OTTI — — Net realized gains/(losses) (1) $ (18 ) $ — (1) Excludes the net realized gains/(losses) related to investments in debt securities held for trading purposes.
Schedule of Other Investments	Other Investments consisted of the following as of: (in thousands) March 31, 2018 December 31, 2017 FHLB of Pittsburgh and Federal Reserve Bank stock $ 500,833 $ 516,693 Low Income Housing Tax Credit investments ("LIHTC") 96,899 88,170 Equity Securities not held for trading 10,927 — CDs with a maturity greater than 90 days 153,358 54,000 Trading Securities 3,024 1 Total $ 765,041 $ 658,864
Realized and Unrealized Gains (Losses) on Equity Securities	Three-Month Period Ended March 31, (in thousands) 2018 2017 Net gains/(losses) on equity securities 1 $ 47 $ (18 ) Less: net gains/(losses) recognized during the period on equity securities sold during the period 1 — — Unrealized gains/(losses) recognized during the reporting period on equity securities still held at the reporting period date 1 $ 47 $ (18 ) (1) Changes in the fair value of equity securities were not recognized in earnings prior to the adoption of ASU 2016-01.

LOANS AND ALLOWANCE FOR CREDI32

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables)	3 Months Ended
	Mar. 31, 2018
Loans and Leases Receivable Disclosure [Abstract]
Schedule of Loans Receivable	The following presents the composition of the gross loans and leases HFI by portfolio and by rate type: March 31, 2018 December 31, 2017 (dollars in thousands) Amount Percent Amount Percent Commercial LHFI: Commercial real estate ("CRE") loans $ 9,072,529 11.3 % $ 9,279,225 11.5 % Commercial and industrial loans 13,712,573 17.1 % 14,438,311 17.9 % Multifamily loans 8,081,924 10.1 % 8,274,435 10.1 % Other commercial (2) 7,337,433 9.2 % 7,174,739 8.9 % Total commercial LHFI 38,204,459 47.7 % 39,166,710 48.4 % Consumer loans secured by real estate: Residential mortgages 9,198,059 11.5 % 8,846,765 11.0 % Home equity loans and lines of credit 5,788,682 7.2 % 5,907,733 7.3 % Total consumer loans secured by real estate 14,986,741 18.7 % 14,754,498 18.3 % Consumer loans not secured by real estate: RICs and auto loans - originated 23,583,727 29.4 % 23,081,424 28.6 % RICs and auto loans - purchased 1,515,086 1.9 % 1,834,868 2.3 % Personal unsecured loans 1,261,238 1.6 % 1,285,677 1.6 % Other consumer (3) 567,077 0.7 % 617,675 0.8 % Total consumer loans 41,913,869 52.3 % 41,574,142 51.6 % Total LHFI (1) $ 80,118,328 100.0 % $ 80,740,852 100.0 % Total LHFI: Fixed rate $ 51,066,020 63.7 % $ 50,653,790 62.7 % Variable rate 29,052,308 36.3 % 30,087,062 37.3 % Total LHFI (1) $ 80,118,328 100.0 % $ 80,740,852 100.0 % (1) Total LHFI includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts as well as purchase accounting adjustments. These items resulted in a net increase in the loan balances of $1.4 billion and $1.3 billion as of March 31, 2018 and December 31, 2017 , respectively. (2) Other commercial includes commercial equipment vehicle financing ("CEVF") leveraged leases and loans. (3) Other consumer primarily includes recreational vehicle ("RV") and marine loans. The composition of the portfolio segment is as follows: (in thousands) March 31, 2018 December 31, 2017 RICs - Purchased HFI: Unpaid principal balance ("UPB") (1) $ 1,592,887 $ 1,929,548 UPB - FVO (2) 19,773 24,926 Total UPB 1,612,660 1,954,474 Purchase marks (3) (97,574 ) (119,606 ) Total RICs - Purchased HFI 1,515,086 1,834,868 RICs - Originated HFI: UPB (1) 23,817,893 23,373,202 Net discount (272,727 ) (309,920 ) Total RICs - Originated 23,545,166 23,063,282 SBNA auto loans 38,561 18,142 Total RICs - originated post Change in Control 23,583,727 23,081,424 Total RICs and auto loans HFI $ 25,098,813 $ 24,916,292 (1) UPB does not include amounts related to the loan receivables - unsecured and loan receivables from dealers due to the short-term and revolving nature of these receivables. (2) The Company elected to account for these loans, which were acquired with evidence of credit deterioration, under the FVO. (3) Includes purchase marks of $4.4 million and $5.5 million related to purchase loan portfolios on which we elected to apply the FVO at March 31, 2018 and December 31, 2017 , respectively.
Allowance for Credit Losses by Portfolio Segment	The activity in the ACL by portfolio segment for the three-month period ended March 31, 2018 and 2017 was as follows: Three-Month Period Ended March 31, 2018 (in thousands) Commercial Consumer Unallocated Total Allowance for loan and lease losses ("ALLL"), beginning of period $ 443,796 $ 3,420,756 $ 47,023 $ 3,911,575 Provision for loan and lease losses 41,232 480,548 — 521,780 Charge-offs (32,960 ) (1,218,936 ) — (1,251,896 ) Recoveries 10,006 661,744 — 671,750 Charge-offs, net of recoveries (22,954 ) (557,192 ) — (580,146 ) ALLL, end of period $ 462,074 $ 3,344,112 $ 47,023 $ 3,853,209 Reserve for unfunded lending commitments, beginning of period $ 108,805 $ 306 $ — $ 109,111 (Release of)/Provision for reserve for unfunded lending commitments (19,263 ) 17 — (19,246 ) Reserve for unfunded lending commitments, end of period 89,542 323 — 89,865 Total ACL, end of period $ 551,616 $ 3,344,435 $ 47,023 $ 3,943,074 Ending balance, individually evaluated for impairment (1) $ 94,993 $ 1,628,930 $ — $ 1,723,923 Ending balance, collectively evaluated for impairment 367,081 1,715,182 47,023 2,129,286 Financing receivables: Ending balance $ 38,400,180 $ 43,678,843 $ — $ 82,079,023 Ending balance, evaluated under the FVO or lower of cost or fair value 195,721 1,798,347 — 1,994,068 Ending balance, individually evaluated for impairment (1) 568,557 6,315,802 — 6,884,359 Ending balance, collectively evaluated for impairment 37,635,902 35,564,694 — 73,200,596 (1) Consists of loans in troubled debt restructuring ("TDR") status. Three-Month Period Ended March 31, 2017 (in thousands) Commercial Consumer Unallocated Total ALLL, beginning of period $ 449,835 $ 3,317,606 $ 47,023 $ 3,814,464 Provision for loan and lease losses 18,777 718,558 — 737,335 Charge-offs (26,173 ) (1,237,280 ) — (1,263,453 ) Recoveries 10,580 623,937 — 634,517 Charge-offs, net of recoveries (15,593 ) (613,343 ) — (628,936 ) ALLL, end of period $ 453,019 $ 3,422,821 $ 47,023 $ 3,922,863 Reserve for unfunded lending commitments, beginning of period $ 121,613 $ 806 $ — $ 122,419 (Release of) unfunded lending commitments (1,860 ) (30 ) — (1,890 ) Loss on unfunded lending commitments (133 ) — — (133 ) Reserve for unfunded lending commitments, end of period 119,620 776 — 120,396 Total ACL, end of period $ 572,639 $ 3,423,597 $ 47,023 $ 4,043,259 Ending balance, individually evaluated for impairment (1) $ 99,914 $ 1,518,545 $ — $ 1,618,459 Ending balance, collectively evaluated for impairment 353,105 1,904,276 47,023 2,304,404 Financing receivables: Ending balance $ 42,415,806 $ 43,402,053 $ — $ 85,817,859 Ending balance, evaluated under the FVO or lower of cost or fair value (1) 103,834 2,008,152 — 2,111,986 Ending balance, individually evaluated for impairment (1) 675,116 6,040,694 — 6,715,810 Ending balance, collectively evaluated for impairment 41,636,856 35,353,207 — 76,990,063 (1) Consists of loans in TDR status. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) The following table presents the activity in the allowance for loan losses for the RICs acquired in the Change in Control and those originated by SC subsequent to the Change in Control. Three-Month Period Ended March 31, 2018 (in thousands) Purchased Originated Total ALLL, beginning of period $ 384,167 $ 2,779,044 $ 3,163,211 (Release of) / Provision for loan and lease losses (15,830 ) 487,159 471,329 Charge-offs (105,510 ) (1,078,515 ) (1,184,025 ) Recoveries 59,899 594,952 654,851 Charge-offs, net of recoveries (45,611 ) (483,563 ) (529,174 ) ALLL, end of period $ 322,726 $ 2,782,640 $ 3,105,366 Three-Month Period Ended March 31, 2017 (in thousands) Purchased Originated Total ALLL, beginning of period $ 559,092 $ 2,538,127 $ 3,097,219 Provision for loan and lease losses 26,125 660,524 686,649 Charge-offs (188,686 ) (1,008,053 ) (1,196,739 ) Recoveries 98,690 517,286 615,976 Charge-offs, net of recoveries (89,996 ) (490,767 ) (580,763 ) ALLL, end of period $ 495,221 $ 2,707,884 $ 3,203,105
Schedule of Non-accrual Loans	The recorded investment in non-accrual loans disaggregated by class of financing receivables and other non-performing assets is summarized as follows: (in thousands) March 31, 2018 December 31, 2017 Non-accrual loans: Commercial: CRE $ 132,941 $ 139,236 Commercial and industrial 203,738 230,481 Multifamily 10,569 11,348 Other commercial 79,474 83,468 Total commercial loans 426,722 464,533 Consumer: Residential mortgages 257,995 265,436 Home equity loans and lines of credit 131,036 134,162 RICs and auto loans - originated 1,644,605 1,816,226 RICs - purchased 207,328 256,617 Personal unsecured loans 2,820 2,366 Other consumer 11,118 10,657 Total consumer loans 2,254,902 2,485,464 Total non-accrual loans 2,681,624 2,949,997 Other real estate owned ("OREO") 126,714 130,777 Repossessed vehicles 171,359 210,692 Foreclosed and other repossessed assets 1,324 2,190 Total OREO and other repossessed assets 299,397 343,659 Total non-performing assets $ 2,981,021 $ 3,293,656
Aging Analysis of Loan Portfolio	The age of recorded investments in past due loans and accruing loans 90 days or greater past due disaggregated by class of financing receivables is summarized as follows: As of: March 31, 2018 (in thousands) 30-89 90 Total Current Total (1) Recorded Investment Commercial: CRE $ 33,982 $ 74,069 $ 108,051 $ 8,964,478 $ 9,072,529 $ — Commercial and industrial (1) 90,510 82,703 173,213 13,735,081 13,908,294 — Multifamily 13,443 3,003 16,446 8,065,478 8,081,924 — Other commercial 48,961 3,180 52,141 7,285,292 7,337,433 — Consumer: Residential mortgages 189,872 191,010 380,882 8,994,194 9,375,076 15 Home equity loans and lines of credit 47,614 87,221 134,835 5,653,847 5,788,682 — RICs and auto loans - originated 2,634,364 228,811 2,863,175 21,340,720 24,203,895 — RICs and auto loans - purchased 330,226 24,139 354,365 1,160,721 1,515,086 — Personal unsecured loans 99,826 90,329 190,155 2,038,872 2,229,027 81,440 Other consumer 20,501 13,701 34,202 532,875 567,077 — Total $ 3,509,299 $ 798,166 $ 4,307,465 $ 77,771,558 $ 82,079,023 $ 81,455 (1) Commercial and industrial loans includes $195.7 million of LHFS at March 31, 2018 . (2) Residential mortgages includes $177.0 million of LHFS at March 31, 2018 . (3) RICs and auto loans includes $620.2 million of LHFS at March 31, 2018 . (4) Personal unsecured loans includes $967.8 million of LHFS at March 31, 2018 . As of December 31, 2017 (in thousands) 30-89 90 Total Current Total (1) Recorded Commercial: CRE $ 25,174 $ 100,524 $ 125,698 $ 9,153,527 $ 9,279,225 $ — Commercial and industrial 49,584 75,924 125,508 14,461,981 14,587,489 — Multifamily 3,562 2,990 6,552 8,267,883 8,274,435 — Other commercial 34,021 3,359 37,380 7,137,359 7,174,739 — Consumer: Residential mortgages 217,558 210,777 428,335 8,628,600 9,056,935 — Home equity loans and lines of credit 50,919 91,975 142,894 5,764,839 5,907,733 — RICs and auto loans - originated 3,405,721 327,045 3,732,766 20,449,706 24,182,472 — RICs and auto loans - purchased 452,235 40,516 492,751 1,342,117 1,834,868 — Personal unsecured loans 85,394 105,054 190,448 2,157,319 2,347,767 96,461 Other consumer 24,879 14,220 39,099 578,576 617,675 — Total $ 4,349,047 $ 972,384 $ 5,321,431 $ 77,941,907 $ 83,263,338 $ 96,461 (1) Commercial and industrial loans included $149.2 million of LHFS at December 31, 2017 . (2) Residential mortgages included $210.2 million of LHFS at December 31, 2017 , (3) RICs and auto loans included $1.1 billion of LHFS at December 31, 2017 . (4) Personal unsecured loans included $1.1 billion of LHFS at December 31, 2017 .
Schedule of Impaired Loans by Class	Impaired loans disaggregated by class of financing receivables are summarized as follows: March 31, 2018 (in thousands) Recorded Investment (1) UPB Related Average With no related allowance recorded: Commercial: CRE $ 125,669 $ 151,164 $ — $ 126,039 Commercial and industrial 51,175 53,140 — 66,858 Multifamily 11,929 11,929 — 10,908 Other commercial 1,877 1,877 — 1,322 Consumer: Residential mortgages 147,333 198,200 — 127,327 Home equity loans and lines of credit 53,101 55,368 — 52,749 RICs and auto loans - originated 11 11 — 6 RICs and auto loans - purchased 13,252 17,010 — 14,722 Personal unsecured loans (2) 31,972 31,972 — 31,482 Other consumer 8,559 12,183 — 9,058 With an allowance recorded: Commercial: CRE 99,787 112,480 15,976 98,734 Commercial and industrial 184,297 185,115 55,322 180,533 Multifamily 4,791 4,791 19 5,496 Other commercial 73,696 73,696 23,676 75,704 Consumer: Residential mortgages 279,472 319,018 38,586 300,782 Home equity loans and lines of credit 64,004 76,156 5,078 64,416 RICs and auto loans - originated 4,736,587 4,787,816 1,281,642 4,762,443 RICs and auto loans - purchased 1,003,764 1,134,415 294,669 1,085,120 Personal unsecured loans 16,590 16,842 6,934 16,534 Other consumer 10,792 14,446 2,021 11,192 Total: Commercial $ 553,221 $ 594,192 $ 94,993 $ 565,594 Consumer 6,365,437 6,663,437 1,628,930 6,475,831 Total $ 6,918,658 $ 7,257,629 $ 1,723,923 $ 7,041,425 (1) Recorded investment includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts, as well as purchase accounting adjustments. (2) Includes LHFS. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) The Company recognized interest income, not including the impact of purchase accounting adjustments, of $261.2 million for the three-month period ended March 31, 2018 on approximately $5.8 billion of TDRs that were in performing status as of March 31, 2018 . December 31, 2017 (in thousands) Recorded Investment (1) UPB Related Average With no related allowance recorded: Commercial: CRE $ 126,406 $ 174,842 $ — $ 139,063 Commercial and industrial 82,541 96,324 — 75,338 Multifamily 9,887 10,838 — 10,129 Other commercial 767 911 — 903 Consumer: Residential mortgages 107,320 128,458 — 141,195 Home equity loans and lines of credit 52,397 54,421 — 50,635 RICs and auto loans - purchased 16,192 20,783 — 25,283 Personal unsecured loans (2) 30,992 30,992 — 28,500 Other consumer 9,557 13,055 — 14,446 With an allowance recorded: Commercial: CRE 97,680 117,730 18,523 118,492 Commercial and industrial 176,769 200,382 59,696 196,674 Multifamily 6,201 6,201 313 4,566 Other commercial 77,712 77,772 23,794 42,465 Consumer: Residential mortgages 322,092 392,833 40,963 303,361 Home equity loans and lines of credit 64,827 77,435 4,770 57,345 RICs and auto loans - originated 4,788,299 4,847,929 1,350,022 4,029,808 RICs and auto loans - purchased 1,166,476 1,318,306 347,663 1,511,212 Personal unsecured loans 16,477 16,661 6,259 16,668 Other consumer 11,592 15,290 2,151 12,343 Total: Commercial $ 577,963 $ 685,000 $ 102,326 $ 587,630 Consumer 6,586,221 6,916,163 1,751,828 6,190,796 Total $ 7,164,184 $ 7,601,163 $ 1,854,154 $ 6,778,426 (1) Recorded investment includes deferred loan fees, net of deferred origination costs and unamortized purchase premiums, net of discounts, as well as purchase accounting adjustments. (2) Includes LHFS.
Schedule of Loans by Credit Quality Indicators	Commercial loan credit quality indicators by class of financing receivables are summarized as follows: March 31, 2018 CRE Commercial and industrial Multifamily Remaining Total (1) (in thousands) Rating: Pass $ 8,120,502 $ 12,576,220 $ 7,900,191 $ 7,212,830 $ 35,809,743 Special mention 617,232 831,097 135,106 43,314 1,626,749 Substandard 302,262 417,553 46,627 19,117 785,559 Doubtful 32,533 83,424 — 62,172 178,129 Total commercial loans $ 9,072,529 $ 13,908,294 $ 8,081,924 $ 7,337,433 $ 38,400,180 (1) Financing receivables include LHFS. December 31, 2017 CRE Commercial and industrial Multifamily Remaining Total (1) (in thousands) Rating: Pass $ 8,281,626 $ 13,176,248 $ 8,123,727 $ 7,059,627 $ 36,641,228 Special mention 645,835 941,683 105,225 29,657 1,722,400 Substandard 317,510 398,325 45,483 21,747 783,065 Doubtful 34,254 71,233 — 63,708 169,195 Total commercial loans $ 9,279,225 $ 14,587,489 $ 8,274,435 $ 7,174,739 $ 39,315,888 (1) Financing receivables include LHFS. Consumer Lending Asset Quality Indicators-Credit Score Consumer financing receivables for which either an internal or external credit score is a core component of the allowance model are summarized by credit score as follows: Credit Score Range (2) March 31, 2018 December 31, 2017 (dollars in thousands) RICs and auto loans (3) Percent RICs and auto loans (3) Percent No FICO ®(1) $ 4,016,803 15.6 % $ 4,530,238 17.4 % <600 13,532,536 52.7 % 13,395,203 51.4 % 600-639 4,410,604 17.1 % 4,332,278 16.7 % >=640 3,759,038 14.6 % 3,759,621 14.5 % Total $ 25,718,981 100.0 % $ 26,017,340 100.0 % (1) Consists primarily of loans for which credit scores are not considered in the ALLL model. (2) Credit scores updated quarterly. (3) RICs and auto loans include $620.2 million and $1.1 billion of LHFS at March 31, 2018 and December 31, 2017 , respectively, that do not have an allowance.
Schedule of Financing Receivable by LTV	110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 190,747 $ 1,393 $ 478 $ — $ — $ 192,618 <600 7,436 195,852 69,172 19,838 7,444 299,742 600-639 4,896 150,132 56,266 7,613 6,090 224,997 640-679 4,793 279,728 123,431 17,573 10,114 435,639 680-719 6,921 506,113 245,154 21,419 16,864 796,471 720-759 7,073 719,337 325,201 31,454 14,985 1,098,050 >=760 14,169 1,881,952 746,823 64,040 34,181 2,741,165 Grand Total $ 236,035 $ 3,734,507 $ 1,566,525 $ 161,937 $ 89,678 $ 5,788,682 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Residential Mortgages (1)(3) December 31, 2017 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 372,116 $ 6,759 $ 1,214 $ — $ — $ — $ — $ 380,089 <600 21 220,737 55,108 35,617 23,834 2,505 6,020 343,842 600-639 45 155,920 42,420 35,009 34,331 2,696 6,259 276,680 640-679 37 320,248 94,601 90,708 86,740 3,011 2,641 597,986 680-719 98 554,058 236,602 136,980 147,754 3,955 10,317 1,089,764 720-759 92 952,532 480,900 178,876 183,527 4,760 8,600 1,809,287 >=760 588 3,019,514 1,066,919 263,541 187,713 8,418 12,594 4,559,287 Grand Total $ 372,997 $ 5,229,768 $ 1,977,764 $ 740,731 $ 663,899 $ 25,345 $ 46,431 $ 9,056,935 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) December 31, 2017 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 154,690 $ 536 $ 238 $ — $ — $ 155,464 <600 8,064 190,657 64,554 16,634 22,954 302,863 600-639 6,276 158,461 61,250 9,236 9,102 244,325 640-679 6,745 297,003 127,347 19,465 14,058 464,618 680-719 8,875 500,234 258,284 24,675 20,261 812,329 720-759 8,587 724,831 332,508 30,526 19,119 1,115,571 >=760 17,499 1,917,373 768,905 73,573 35,213 2,812,563 Grand Total $ 210,736 $ 3,789,095 $ 1,613,086 $ 174,109 $ 120,707 $ 5,907,733 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company." id="sjs-B10">Residential mortgage and home equity financing receivables by LTV and FICO range are summarized as follows: Residential Mortgages (1)(3) March 31, 2018 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 266,671 $ 6,616 $ 1,208 $ — $ — $ — $ — $ 274,495 <600 13 223,009 54,447 33,835 21,303 2,609 1,422 336,638 600-639 44 155,786 41,930 34,643 32,438 1,229 6,283 272,353 640-679 34 319,185 97,132 89,991 90,856 2,446 2,502 602,146 680-719 95 579,125 254,807 138,197 163,235 3,436 9,669 1,148,564 720-759 173 1,004,260 573,335 188,949 195,187 4,819 7,740 1,974,463 >=760 563 3,148,412 1,106,980 290,938 200,107 8,371 11,046 4,766,417 Grand Total $ 267,593 $ 5,436,393 $ 2,129,839 $ 776,553 $ 703,126 $ 22,910 $ 38,662 $ 9,375,076 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and combined LTV ("CLTV") for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) March 31, 2018 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 190,747 $ 1,393 $ 478 $ — $ — $ 192,618 <600 7,436 195,852 69,172 19,838 7,444 299,742 600-639 4,896 150,132 56,266 7,613 6,090 224,997 640-679 4,793 279,728 123,431 17,573 10,114 435,639 680-719 6,921 506,113 245,154 21,419 16,864 796,471 720-759 7,073 719,337 325,201 31,454 14,985 1,098,050 >=760 14,169 1,881,952 746,823 64,040 34,181 2,741,165 Grand Total $ 236,035 $ 3,734,507 $ 1,566,525 $ 161,937 $ 89,678 $ 5,788,682 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. NOTE 4. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Residential Mortgages (1)(3) December 31, 2017 N/A (2) LTV<=70% 70.01-80% 80.01-90% 90.01-100% 100.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (2) $ 372,116 $ 6,759 $ 1,214 $ — $ — $ — $ — $ 380,089 <600 21 220,737 55,108 35,617 23,834 2,505 6,020 343,842 600-639 45 155,920 42,420 35,009 34,331 2,696 6,259 276,680 640-679 37 320,248 94,601 90,708 86,740 3,011 2,641 597,986 680-719 98 554,058 236,602 136,980 147,754 3,955 10,317 1,089,764 720-759 92 952,532 480,900 178,876 183,527 4,760 8,600 1,809,287 >=760 588 3,019,514 1,066,919 263,541 187,713 8,418 12,594 4,559,287 Grand Total $ 372,997 $ 5,229,768 $ 1,977,764 $ 740,731 $ 663,899 $ 25,345 $ 46,431 $ 9,056,935 (1) Includes LHFS. (2) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (3) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company. Home Equity Loans and Lines of Credit (2) December 31, 2017 N/A (1) LTV<=70% 70.01-90% 90.01-110% LTV>110% Grand Total FICO Score (dollars in thousands) N/A (1) $ 154,690 $ 536 $ 238 $ — $ — $ 155,464 <600 8,064 190,657 64,554 16,634 22,954 302,863 600-639 6,276 158,461 61,250 9,236 9,102 244,325 640-679 6,745 297,003 127,347 19,465 14,058 464,618 680-719 8,875 500,234 258,284 24,675 20,261 812,329 720-759 8,587 724,831 332,508 30,526 19,119 1,115,571 >=760 17,499 1,917,373 768,905 73,573 35,213 2,812,563 Grand Total $ 210,736 $ 3,789,095 $ 1,613,086 $ 174,109 $ 120,707 $ 5,907,733 (1) Residential mortgages and home equity loans and lines of credit in the "N/A" range for LTV or FICO score primarily represent the balance on loans serviced by others, in run-off portfolios or for which a current LTV or FICO score is unavailable. (2) Allowance model considers LTV for financing receivables in first lien position for the Company and CLTV for financing receivables in second lien position for the Company.
Summary of Performing and Non-performing TDRs	The following table summarizes the Company’s performing and non-performing TDRs at the dates indicated: (in thousands) March 31, 2018 December 31, 2017 Performing $ 5,811,401 $ 5,824,304 Non-performing 785,958 982,868 Total $ 6,597,359 $ 6,807,172
Schedule of Troubled Debt Restructurings	The following tables detail the activity of TDRs for the three-month period ended March 31, 2018 and 2017 , respectively: Three-Month Period Ended March 31, 2018 Number of Pre-TDR Recorded (1) Term Extension Principal Forbearance Other (4) Post-TDR Recorded Investment (2) (dollars in thousands) Commercial: CRE 27 $ 34,507 $ (11 ) $ (30 ) $ (1,101 ) $ 33,365 Commercial and industrial 80 3,725 (4 ) — (131 ) 3,590 Consumer: Residential mortgages (3) 61 9,927 — — (720 ) 9,207 Home equity loans and lines of credit 94 6,104 — — (232 ) 5,872 RICs and auto loans - originated 32,787 562,736 (1,175 ) — (73 ) 561,488 RICs - purchased 1,895 14,217 (316 ) — (2 ) 13,899 Personal unsecured loans 4,833 7,860 — — (98 ) 7,762 Other consumer 13 136 (1 ) — (4 ) 131 Total 39,790 $ 639,212 $ (1,507 ) $ (30 ) $ (2,361 ) $ 635,314 (1) Pre-TDR modification outstanding recorded investment amount is the month-end balance prior to the month in which the modification occurred. (2) Post-TDR modification outstanding recorded investment amount is the month-end balance for the month in which the modification occurred. (3) The post-TDR modification outstanding recorded investment amounts for residential mortgages exclude interest reserves. (4) Other modifications may include modifications such as fee waivers, or capitalization of fees. Three-Month Period Ended March 31, 2017 Number of Pre-TDR Recorded (1) Term Extension Principal Forbearance Other (4) Post-TDR Recorded Investment (2) (dollars in thousands) Commercial: CRE 24 $ 30,001 $ (2 ) $ 1 $ 340 $ 30,340 Commercial and industrial 242 8,034 (4 ) — — 8,030 Consumer: Residential mortgages (3) 89 15,993 — — (183 ) 15,810 Home equity loans and lines of credit 19 1,432 — — 121 1,553 RICs and auto loans - originated 50,910 906,599 (934 ) — (107 ) 905,558 RICs - purchased 55 289 (5 ) — (2 ) 282 Personal unsecured loans 17,757 24,855 — — (109 ) 24,746 Other consumer 59 2,118 — — (1 ) 2,117 Total 69,155 $ 989,321 $ (945 ) $ 1 $ 59 $ 988,436 (1) Pre-TDR modification outstanding recorded investment amount is the month-end balance prior to the month in which the modification occurred. (2) Post-TDR modification outstanding recorded investment amount is the month-end balance for the month in which the modification occurred. (3) The post-TDR modification outstanding recorded investment amounts for residential mortgages exclude interest reserves. (4) Other modifications may include modifications such as interest rate reductions, fee waivers, or capitalization of fees.
Schedule of Troubled Debt Restructurings Subsequently Defaulted	The following table details period-end recorded investment balances of TDRs that became TDRs during the past twelve-month period and have subsequently defaulted during the three-month periods ended March 31, 2018 and March 31, 2017 , respectively. Three-Month Period Ended March 31, 2018 2017 Number of Recorded Investment (1) Number of Recorded Investment (1) (dollars in thousands) Commercial CRE 2 $ 284 35 $ 7,721 Commercial and industrial 52 1,520 66 2,887 Consumer: Residential mortgages 64 8,868 29 4,161 Home equity loans and lines of credit 7 551 2 173 RICs and auto loans 12,022 201,669 12,281 214,002 Personal Unsecured loans 2,324 3,243 874 1,707 Other consumer 1 10 9 105 Total 14,472 $ 216,145 13,296 $ 230,756 (1) The recorded investment represents the period-end balance at March 31, 2018 and 2017 . Does not include Chapter 7 bankruptcy TDRs.

OPERATING LEASE ASSETS, NET (Ta

OPERATING LEASE ASSETS, NET (Tables)	3 Months Ended
	Mar. 31, 2018
Leases [Abstract]
Schedule of Operating Lease Assets, Net	Operating lease assets, net consisted of the following as of March 31, 2018 and December 31, 2017 : (in thousands) March 31, 2018 December 31, 2017 Leased vehicles $ 14,777,384 $ 14,751,568 Origination fees and other costs 36,563 27,246 Manufacturer subvention payments (1,077,250 ) (1,047,113 ) Leased vehicles, gross 13,736,697 13,731,701 Less: accumulated depreciation (3,075,176 ) (3,333,125 ) Leased vehicles, net 10,661,521 10,398,576 Commercial equipment vehicles and aircraft, gross 131,316 93,981 Less: accumulated depreciation (21,941 ) (18,249 ) Commercial equipment vehicles and aircraft, net 109,375 75,732 Total operating lease assets, net $ 10,770,896 $ 10,474,308
Schedule of Future Minimum Rental Payments Due to the Company Under Operating Leases	The following summarizes the future minimum rental payments due to the Company as lessor under operating leases as of March 31, 2018 (in thousands): 2018 $ 1,393,256 2019 1,326,920 2020 647,034 2021 59,511 2022 6,754 Thereafter 16,370 Total $ 3,449,845

VIEs (Tables)

VIEs (Tables)	3 Months Ended
	Mar. 31, 2018
Variable Interest Entity and Securitizations [Abstract]
Schedule of Variable Interest Entities	The assets of consolidated VIEs that are included in the Company's Condensed Consolidated Financial Statements , presented reflecting the transfer of the underlying assets in order to reflect legal ownership, that can be used to settle obligations of the consolidated VIEs and the liabilities of these consolidated entities for which creditors (or beneficial interest holders) do not have recourse to our general credit were as follows: (in thousands) March 31, 2018 December 31, 2017 Assets Restricted cash $ 2,380,619 $ 1,995,557 Loans (1)(2) 22,121,392 22,712,864 Operating lease assets, net 10,612,824 10,160,327 Various other assets 810,497 733,123 Total Assets $ 35,925,332 $ 35,601,871 Liabilities Notes payable (2) $ 28,634,362 $ 28,469,999 Various other liabilities 193,133 197,969 Total Liabilities $ 28,827,495 $ 28,667,968 (1) Includes $453.0 million and $1.1 billion of RICs HFS at March 31, 2018 and December 31, 2017 , respectively. (2) Reflects the impacts of purchase accounting.
Summary of Cash Flows Received	A summary of the cash flows received from the off-balance sheet Trusts for the periods indicated is as follows: Three-Month Period Ended March 31, (in thousands) 2018 2017 Assets securitized (1) $ 1,475,253 $ 700,022 Net proceeds from new securitizations $ 1,474,820 $ 702,319 Cash received for servicing fees 8,078 1,398 Total cash received from Trusts $ 1,482,898 $ 703,717 (1) Represents the UPB at the time of original securitization. Below is a summary of the cash flows received from the on-balance sheet Trusts for the periods indicated: Three-Month Period Ended March 31, (in thousands) 2018 2017 Assets securitized $ 7,240,944 $ 7,646,625 Net proceeds from new securitizations (1) $ 3,476,322 $ 5,576,801 Net proceeds from sale of retained bonds 211,610 115,970 Cash received for servicing fees (2) 215,790 208,923 Net distributions from Trusts (2) 545,152 678,229 Total cash received from Trusts $ 4,448,874 $ 6,579,923 (1) Includes additional advances on existing securitizations. (2) These amounts are not reflected in the accompanying Condensed Consolidated SCF because the cash flows are between the VIEs and other entities included in the consolidation.
Schedule of Off-balance Sheet Variable Interest Entities Portfolio	The portfolio was comprised as follows: (in thousands) March 31, 2018 December 31, 2017 SPAIN $ 3,176,238 $ 2,024,016 Total serviced for related parties 3,176,238 2,024,016 Chrysler Capital securitizations 1,182,457 1,404,232 Total serviced for third parties 1,182,457 1,404,232 Total serviced for other portfolio $ 4,358,695 $ 3,428,248

GOODWILL AND OTHER INTANGIBLES

GOODWILL AND OTHER INTANGIBLES (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table presents the Company's goodwill by its reporting units at March 31, 2018 : (in thousands) Consumer and Business Banking Commercial Banking GCB SC Total Goodwill at March 31, 2018 $ 1,880,304 $ 1,412,995 $ 131,130 $ 1,019,960 $ 4,444,389
Schedule of Finite-Lived Intangible Assets	The following table details amounts related to the Company's intangible assets subject to amortization for the dates indicated. March 31, 2018 December 31, 2017 (in thousands) Net Carrying Amount Accumulated Amortization Net Carrying Amount Accumulated Amortization Intangibles subject to amortization: Dealer networks $ 416,607 $ (163,393 ) $ 426,411 $ (153,589 ) Chrysler relationship 76,250 (62,500 ) 80,000 (58,750 ) Trade name 15,600 (2,400 ) 15,900 (2,100 ) Other intangibles 12,011 (57,311 ) 13,442 (56,021 ) Total intangibles subject to amortization $ 520,468 $ (285,604 ) $ 535,753 $ (270,460 )
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	The estimated aggregate amortization expense related to intangibles, excluding any impairment charges, for each of the five succeeding calendar years ending December 31 is: Year Calendar Year Amount Recorded To Date Remaining Amount To Record (in thousands) 2018 $ 60,644 $ 15,288 $ 45,356 2019 58,975 — 58,975 2020 58,642 — 58,642 2021 39,889 — 39,889 2022 39,889 — 39,889 Thereafter 277,717 — 277,717

OTHER ASSETS (Tables)

OTHER ASSETS (Tables)	3 Months Ended
	Mar. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Other Assets	The following is a detail of items that comprise other assets at March 31, 2018 and December 31, 2017 : (in thousands) March 31, 2018 December 31, 2017 Income tax receivables $ 293,072 $ 292,220 Derivative assets at fair value 581,076 448,977 Other repossessed assets 172,683 212,882 MSRs 163,148 149,197 Prepaid expenses 178,920 172,547 OREO 126,714 130,777 Deferred tax asset, net 799,423 771,652 Accrued interest receivable 496,144 563,607 Equity method investments 198,923 194,434 Miscellaneous assets and receivables 984,645 696,134 Total other assets $ 3,994,748 $ 3,632,427
Schedule of Servicing Assets at Fair Value	The following table presents a summary of activity for the Company's residential MSRs that are included in the Condensed Consolidated Balance Sheets . Three-Month Period Ended (in thousands) March 31, 2018 March 31, 2017 Fair value at beginning of period (1) $ 145,993 $ 146,589 Mortgage servicing assets recognized 2,755 5,730 Principal reductions (3,661 ) (4,321 ) Change in fair value due to valuation assumptions 15,043 1,457 Fair value at end of period (1) $ 160,130 $ 149,455 (1) The Company had total MSRs of $163.1 million and $149.2 million as of March 31, 2018 and December 31, 2017 , respectively. The Company has elected to account for the majority of its MSR balance using the FVO, while the remainder of the MSRs are accounted for using the lower of cost or market and are not presented within this table.

DEPOSITS AND OTHER CUSTOMER A37

DEPOSITS AND OTHER CUSTOMER ACCOUNTS (Tables)	3 Months Ended
	Mar. 31, 2018
Deposits [Abstract]
Summary of Deposits and Other Customer Accounts	Deposits and other customer accounts are summarized as follows: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Percent of total deposits Balance Percent of total deposits Interest-bearing demand deposits $ 8,246,120 13.3 % $ 8,784,597 14.4 % Non-interest-bearing demand deposits 15,603,797 25.2 % 15,402,235 25.3 % Savings 6,123,217 9.9 % 5,903,897 9.7 % Customer repurchase accounts 577,161 1.0 % 802,119 1.4 % Money market 25,726,743 41.6 % 24,530,661 40.3 % CDs 5,564,137 9.0 % 5,407,594 8.9 % Total Deposits (1) $ 61,841,175 100.0 % $ 60,831,103 100.0 % (1) Includes foreign deposits, as defined by the FRB, of $9.0 billion and $9.1 billion at March 31, 2018 and December 31, 2017 , respectively.

BORROWINGS (Tables)

BORROWINGS (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Instrument [Line Items]
Schedule of Borrowings and Other Debt Obligation	The following table presents information regarding the Bank's borrowings and other debt obligations at the dates indicated: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Effective Rate Balance Effective Rate 8.750% subordinated debentures, due May 2018 $ 192,098 8.92 % $ 192,019 8.92 % Subordinated term loan, due February 2019 104,740 7.63 % 111,883 7.12 % FHLB advances, maturing through July 2019 1,500,000 1.91 % 1,950,000 1.53 % Securities sold under repurchase agreements 150,000 1.90 % 150,000 1.56 % Real estate investment trust preferred, due May 2020 144,522 13.24 % 144,167 13.35 % Subordinated term loan, due August 2022 28,001 9.29 % 27,911 8.89 % Total Bank borrowings and other debt obligations $ 2,119,361 3.70 % $ 2,575,980 3.07 % The following table presents information regarding the Parent Company and its subsidiaries' borrowings and other debt obligations at the dates indicated: March 31, 2018 December 31, 2017 (dollars in thousands) Balance Effective Rate Balance Effective Rate Parent Company 3.45% senior notes, due August 2018 $ 181,227 3.62 % $ 244,317 3.62 % 2.70% senior notes, due May 2019 662,337 2.82 % 998,349 2.82 % 2.65% senior notes, due April 2020 996,636 2.82 % 996,238 2.82 % 3.70% senior notes, due March 2022 1,445,928 3.74 % 1,440,044 3.74 % 3.40% senior notes, due January 2023 993,950 3.54 % 993,662 3.54 % 4.50% senior notes, due July 2025 1,095,576 4.56 % 1,095,449 4.56 % 4.40% senior notes, due July 2027 1,049,790 4.40 % 1,049,787 4.40 % Junior subordinated debentures - Sovereign Capital Trust IX, due July 2036 149,469 3.38 % 149,462 3.14 % Common securities - Sovereign Capital Trust IX 4,640 3.38 % 4,640 3.14 % Senior notes, due July 2019 (1) 388,592 2.69 % 388,565 2.31 % Senior notes, due September 2019 (1) 370,783 2.70 % 370,754 2.34 % Senior notes, due January 2020 (1) 302,512 2.71 % 302,494 2.40 % Senior notes, due September 2020 (2) 114,370 3.16 % 115,804 3.32 % Subsidiaries 2.00% subordinated debt, maturing through 2042 40,934 2.00 % 40,842 2.00 % Short-term borrowings, due within one year, due April 2018 93,806 1.70 % 24,000 1.38 % Total due to others overnight, due within one year, due April 2018 18,600 1.70 % 10,000 1.38 % Short-term borrowings, due within one year, due April 2018 20,421 0.25 % 37,546 0.25 % Short-term borrowings, due within one year, maturing through 2018 — — % 7,123 0.83 % Total Parent Company and subsidiaries' borrowings and other debt obligations $ 7,929,571 3.52 % $ 8,269,076 3.45 % (1) These notes bear interest at a rate equal to the three-month London Interbank Offered Rate ("LIBOR") plus 100 basis points per annum. (2) These notes will bear interest at a rate equal to the three-month LIBOR plus 105 basis points per annum.
SC
Debt Instrument [Line Items]
Schedule of Borrowings and Other Debt Obligation	The following tables present information regarding SC's secured structured financings as of March 31, 2018 and December 31, 2017 : March 31, 2018 (dollars in thousands) Balance Initial Note Amounts Issued Initial Weighted Average Interest Rate Range Collateral Restricted Cash SC public securitizations, maturing on various dates (1)(2) $ 15,943,321 $ 37,984,872 1.16% - 2.80% $ 20,910,432 $ 1,629,738 SC privately issued amortizing notes, maturing on various dates (1) 6,919,434 12,632,368 0.88% - 2.86% 8,522,690 573,486 Total SC secured structured financings $ 22,862,755 $ 50,617,240 0.88% - 2.86% $ 29,433,122 $ 2,203,224 (1) SC has entered into various securitization transactions involving its retail automobile installment loans and leases. These transactions are accounted for as secured financings and therefore both the securitized RICs and the related securitization debt issued by SPEs remain on the Condensed Consolidated Balance Sheets . The maturity of this debt is based on the timing of repayments from the securitized assets. (2) Securitizations executed under Rule 144A of the Securities Act are included within this balance. NOTE 10. BORROWINGS (continued) December 31, 2017 (dollars in thousands) Balance Initial Note Amounts Issued Initial Weighted Average Interest Rate Range Collateral Restricted Cash SC public securitizations, maturing on various dates (1)(2) $ 14,995,304 $ 36,800,642 0.89% - 2.80% $ 19,873,621 $ 1,470,459 SC privately issued amortizing notes, maturing on various dates (1) 7,564,637 12,278,282 0.88% - 4.09% 9,232,658 377,300 Total SC secured structured financings $ 22,559,941 $ 49,078,924 0.88% - 4.09% $ 29,106,279 $ 1,847,759 (1) SC has entered into various securitization transactions involving its retail automobile installment loans and leases. These transactions are accounted for as secured financings and therefore both the securitized RICs and the related securitization debt issued by SPEs remain on the Condensed Consolidated Balance Sheets . The maturity of this debt is based on the timing of repayments from the securitized assets. (2) Securitizations executed under Rule 144A of the Securities Act of 1933 (the “Securities Act”) are included within this balance. The following tables present information regarding SC's credit facilities as of March 31, 2018 and December 31, 2017 : March 31, 2018 (dollars in thousands) Balance Committed Amount Effective Rate Assets Pledged Restricted Cash Pledged Warehouse line, maturing on various dates (1) $ 603,145 $ 1,250,000 2.71 % $ 865,991 $ 24,063 Warehouse line, due November 2019 358,220 500,000 2.06 % 421,622 21,337 Warehouse line, due August 2019 (2) 2,105,842 3,900,000 3.42 % 3,108,422 68,631 Warehouse line, due October 2019 611,477 1,800,000 3.43 % 839,499 14,727 Warehouse line, due October 2019 148,565 400,000 3.65 % 206,287 4,070 Warehouse line, due August 2019 (3) 229,984 500,000 3.74 % 348,645 19,915 Warehouse line, due November 2019 297,699 1,000,000 3.63 % 420,623 11,557 Warehouse line, due October 2018 229,800 300,000 3.37 % 268,054 10,719 Warehouse line, due December 2018 — 300,000 — % — — Repurchase facility, maturing on various dates (4)(5) 291,949 291,949 3.49 % 407,299 12,962 Repurchase facility, due April 2018 (5)(7) 196,727 196,727 3.06 % 257,054 — Repurchase facility, due June 2018 (5) 153,177 153,177 3.80 % 222,108 — Repurchase facility, due December 2018 (4) 67,773 67,773 3.55 % 156,202 — Line of credit with related party, due December 2018 (6) 30,000 1,000,000 3.09 % 30,000 — Line of credit with related party, due December 2018 (6) 114,200 750,000 4.34 % 126,392 2,376 Total SC revolving credit facilities $ 5,438,558 $ 12,409,626 3.30 % $ 7,678,198 $ 190,357 (1) As of March 31, 2018 , half of the outstanding balance on this facility matures in March 2019 and the remaining balance matures in March 2020. (2) This line is held exclusively for financing of Chrysler Capital leases. (3) On February 14, 2018 , the maturity of this warehouse line was extended from January 2018 to August 2019. (4) The maturity of this repurchase facility ranges from April 2018 to July 2018. (5) These repurchase facilities are collateralized by securitization notes payable retained by SC. No portion of these facilities is unsecured. These facilities have rolling maturities of up to one year . As the borrower, SC is exposed to liquidity risk due to changes in the market value of retrained securities pledged. In some instances, SC places or receives cash collateral with counteparties under collateral arrangements associated with SC's repurchase agreements. (6) These lines are also collateralized by securitization notes payable and residuals retained by SC. As of March 31, 2018 , no portion of these facilities was unsecured. (7) Half of this repurchase facility was settled on maturity in April 2018 and remaining balance of this repurchase facility was extended to July 2018. NOTE 10. BORROWINGS (continued) December 31, 2017 (dollars in thousands) Balance Committed Amount Effective Assets Pledged Restricted Cash Pledged Warehouse line, maturing on various dates (1) $ 339,145 $ 1,250,000 2.53 % $ 461,353 $ 12,645 Warehouse line, due November 2019 435,220 500,000 1.92 % 521,365 16,866 Warehouse line, due August 2019 (2) 2,044,843 3,900,000 2.96 % 2,929,890 53,639 Warehouse line, due October 2019 226,577 1,800,000 4.95 % 311,336 6,772 Warehouse line, due October 2019 81,865 400,000 4.09 % 114,021 3,057 Warehouse line, due January 2018 (3) 336,484 500,000 2.87 % 473,208 — Warehouse line, due November 2019 403,999 1,000,000 2.66 % 546,782 14,729 Warehouse line, due October 2018 235,700 300,000 2.84 % 289,634 10,474 Warehouse line, due December 2018 — 300,000 1.49 % — — Repurchase facility, maturing on various dates (4)(5) 325,775 325,775 3.24 % 474,188 13,842 Repurchase facility, due April 2018 (5) 202,311 202,311 2.67 % 264,120 — Repurchase facility, due March 2018 (5) 147,500 147,500 3.91 % 222,108 — Repurchase facility, due March 2018 (5) 68,897 68,897 3.04 % 95,762 — Line of credit with related party, due December 2018 (6) — 1,000,000 3.09 % — — Line of credit with related party, due December 2018 (6) 750,000 750,000 1.33 % — — Total SC revolving credit facilities $ 5,598,316 $ 12,444,483 2.73 % $ 6,703,767 $ 132,024 (1) As of December 31, 2017 , half of the outstanding balance on this facility will mature in March 2019 and half will mature in March 2020. (2) This line is held exclusively for financing of Chrysler Capital leases. (3) On February 14, 2018, the maturity of this warehouse line was extended to August 2019. (4) The maturity of this repurchase facility ranges from February 2018 to July 2018. (5) These repurchase facilities are collateralized by securitization notes payable retained by SC. No portion of these facilities are unsecured. These facilities have rolling maturities of up to one year . As the borrower, SC is exposed to liquidity risk due to changes in the market value of retrained securities pledged. In some instances, SC places or receives cash collateral with counteparties under collateral arrangements associated with SC's repurchase agreements. (6) These lines are also collateralized by securitization notes payable and residuals retained by SC. As of December 31, 2017 , no portion of these facilities was unsecured.

ACCUMULATED OTHER COMPREHENSI39

ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of Accumulated Other Comprehensive Income / (Loss)	The following table presents the components of accumulated other comprehensive income/(loss), net of related tax, for the three-month period ended March 31, 2018 and 2017 , respectively. Total Other Total Accumulated Three-Month Period Ended March 31, 2018 December 31, 2017 March 31, 2018 (in thousands) Pretax Tax Net Activity Beginning Net Ending Change in accumulated other comprehensive income on cash flow hedge derivative financial instruments $ (11,462 ) $ (4,671 ) $ (16,133 ) Reclassification adjustment for net (gains) on cash flow hedge derivative financial instruments (1) (1,687 ) 455 (1,232 ) Net unrealized (losses) on cash flow hedge derivative financial instruments (13,149 ) (4,216 ) (17,365 ) $ (6,388 ) $ (17,365 ) $ (23,753 ) Change in unrealized (losses) on investments in debt securities AFS (122,244 ) 10,710 (111,534 ) Reclassification adjustment for net losses included in net income/(expense) on non-OTTI securities (2) 663 (58 ) 605 Net unrealized (losses) on investments in debt securities AFS (121,581 ) 10,652 (110,929 ) (140,498 ) (110,929 ) Cumulative effect of adoption of new ASUs (4) (39,094 ) Net unrealized (losses) on investments in debt securities AFS - upon adoption (150,023 ) (290,521 ) Pension and post-retirement actuarial (loss) (3) 842 (5,304 ) (4,462 ) (51,545 ) (4,462 ) (56,007 ) As of March 31, 2018 $ (133,888 ) $ 1,132 $ (132,756 ) $ (198,431 ) $ (171,850 ) $ (370,281 ) (1) Net (losses)/gains reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statements of Operations for settlements of interest rate swap contracts designated as cash flow hedges. (2) Net (gains)/losses reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statements of Operations for the sale of AFS securities. (3) Included in the computation of net periodic pension costs. (4) Includes impact of other comprehensive income reclassified to Retained earnings as a result of the adoption of ASU 2018-02. Refer to Note 1 for further discussion. NOTE 11. ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (continued) Total Other Total Accumulated Three-Month Period Ended March 31, 2017 December 31, 2016 March 31, 2017 (in thousands) Pretax Tax Net Activity Beginning Net Ending Change in accumulated other comprehensive income on cash flow hedge derivative financial instruments $ (2,828 ) $ (1,269 ) $ (4,097 ) Reclassification adjustment for net losses on cash flow hedge derivative financial instruments (1) 2,387 (777 ) 1,610 Net unrealized (losses) on cash flow hedge derivative financial instruments (441 ) (2,046 ) (2,487 ) $ (6,725 ) $ (2,487 ) $ (9,212 ) Change in unrealized gains on investment securities AFS 31,479 (10,510 ) 20,969 Reclassification adjustment for net (gains) included in net income/(expense) on non-OTTI securities (2) — — — Reclassification adjustment for net losses included in net income/(expense) on OTTI securities (3) — — — Reclassification adjustment for net (gains) included in net income — — — Net unrealized gains on investment securities AFS 31,479 (10,510 ) 20,969 (130,754 ) 20,969 (109,785 ) Pension and post-retirement actuarial gain (4) 913 (428 ) 485 (55,729 ) 485 (55,244 ) As of March 31, 2017 $ 31,951 $ (12,984 ) $ 18,967 $ (193,208 ) $ 18,967 $ (174,241 ) (1) Net gains/(losses) reclassified into Interest on borrowings and other debt obligations in the Condensed Consolidated Statements of Operations for settlements of interest rate swap contracts designated as cash flow hedges. (2) Net (gains)/losses reclassified into Net gain on sale of investment securities sales in the Condensed Consolidated Statements of Operations for the sale of AFS securities. (3) Unrealized losses/(gains) previously recognized in accumulated other comprehensive income on securities for which OTTI was recognized during the period. See further discussion in Note 3 to the Condensed Consolidated Financial Statements . (4) Included in the computation of net periodic pension costs.

DERIVATIVES (Tables)

DERIVATIVES (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative [Line Items]
Impact of Derivative Activities in the Condensed Consolidated Statement of Operations	The following Condensed Consolidated Statement of Operations line items were impacted by the Company’s derivative activities for the three-month periods ended March 31, 2018 and 2017 : Three-Month Period Ended March 31, Derivative Activity (1) Line Item 2018 2017 (in thousands) Cash flow hedges: Pay fixed-receive variable interest rate swaps Interest expense on borrowings $ 2,764 $ 2,343 Pay variable receive-fixed interest rate swap Interest income on loans (2,020 ) (2,781 ) Other derivative activities: Forward commitments to sell loans Miscellaneous income, net (514 ) (10,940 ) Interest rate lock commitments Miscellaneous income, net 148 1,994 Mortgage servicing Miscellaneous income, net (6,895 ) 497 Customer related derivatives Miscellaneous income, net 2,586 (1,887 ) Foreign exchange Miscellaneous income, net 1,289 2,260 Interest rate swaps, caps, and options Miscellaneous income, net 9,717 1,204 Interest expense — — Total return settlement Other administrative expenses — (505 ) Other Miscellaneous income, net (2,831 ) (1,501 ) (1) Gains are disclosed as positive numbers while losses are shown as a negative number regardless of the line item being affected.
Offsetting of Financial Assets	Offsetting of Financial Assets Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet (in thousands) Gross Amounts of Recognized Assets Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Received Net Amount March 31, 2018 Cash flow hedges $ 75,793 $ — $ 75,793 $ — $ 50,677 $ 25,116 Other derivative activities (1) 510,604 7,496 503,108 1,978 106,006 395,124 Total derivatives subject to a master netting arrangement or similar arrangement 586,397 7,496 578,901 1,978 156,683 420,240 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 2,253 — 2,253 — — 2,253 Total Derivative Assets $ 588,650 $ 7,496 $ 581,154 $ 1,978 $ 156,683 $ 422,493 December 31, 2017 Cash flow hedges $ 49,442 $ — $ 49,442 $ — $ 3,076 $ 46,366 Other derivative activities (1) 411,697 6,731 404,966 2,021 77,975 324,970 Total derivatives subject to a master netting arrangement or similar arrangement 461,139 6,731 454,408 2,021 81,051 371,336 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 2,105 — 2,105 — — 2,105 Total Derivative Assets $ 463,244 $ 6,731 $ 456,513 $ 2,021 $ 81,051 $ 373,441 (1) Includes customer-related and other derivatives. (2) Includes mortgage banking derivatives.
Offsetting of Financial Liabilities	Offsetting of Financial Liabilities Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet (in thousands) Gross Amounts of Recognized Liabilities Gross Amounts Offset in the Condensed Consolidated Balance Sheet Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet Financial Instruments Cash Collateral Pledged Net Amount March 31, 2018 Cash flow hedges $ 119,955 $ — $ 119,955 $ — $ 211 $ 119,744 Other derivative activities (1) 450,485 13,255 437,230 — 331,304 105,926 Total derivatives subject to a master netting arrangement or similar arrangement 570,440 13,255 557,185 — 331,515 225,670 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 219 — 219 — — 219 Total Derivative Liabilities $ 570,659 $ 13,255 $ 557,404 $ — $ 331,515 $ 225,889 December 31, 2017 Cash flow hedges $ 84,911 $ — $ 84,911 $ — $ 622 $ 84,289 Other derivative activities (1) 342,752 16,236 326,516 — 165,716 160,800 Total derivatives subject to a master netting arrangement or similar arrangement 427,663 16,236 411,427 — 166,338 245,089 Total derivatives not subject to a master netting arrangement or similar arrangement (2) 148 — 148 — — 148 Total Derivative Liabilities $ 427,811 $ 16,236 $ 411,575 $ — $ 166,338 $ 245,237 (1) Includes customer-related and other derivatives. (2) Includes mortgage banking derivatives.
Designated as hedging instrument
Derivative [Line Items]
Schedule of Derivative Instruments	Derivatives designated as accounting hedges at March 31, 2018 and December 31, 2017 included: (dollars in thousands) Notional Amount Asset Liability Weighted Average Receive Rate Weighted Average Pay Rate Weighted Average Life (Years) March 31, 2018 Cash flow hedges: Pay fixed — receive variable interest rate swaps $ 4,931,593 $ 71,974 $ 2,346 0.07 % 0.15 % 1.92 Pay variable - receive fixed interest rate swaps 4,000,000 — 117,398 1.41 % 1.73 % 2.78 Interest rate floor 1,400,000 3,819 — 0.05 % — % 2.37 Total $ 10,331,593 $ 75,793 $ 119,744 0.58 % 0.74 % 2.31 December 31, 2017 Cash flow hedges: Pay fixed — receive variable interest rate swaps $ 5,183,511 $ 46,422 $ 4,458 0.05 % 0.14 % 2.12 Pay variable - receive fixed interest rate swaps 4,000,000 — 80,453 1.41 % 1.42 % 3.02 Interest rate floor 1,000,000 3,020 — — % — % 2.64 Total $ 10,183,511 $ 49,442 $ 84,911 0.58 % 0.63 % 2.53
Not designated as hedging instrument
Derivative [Line Items]
Schedule of Other Derivative Activities	Other derivative activities at March 31, 2018 and December 31, 2017 included: Notional Asset derivatives Fair value Liability derivatives Fair value (in thousands) March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 March 31, 2018 December 31, 2017 Mortgage banking derivatives: Forward commitments to sell loans $ 318,562 $ 311,852 $ 1 $ 3 $ 972 $ 459 Interest rate lock commitments 175,662 126,194 2,253 2,105 — — Mortgage servicing 355,000 330,000 1,006 193 9,800 2,092 Total mortgage banking risk management 849,224 768,046 3,260 2,301 10,772 2,551 Customer related derivatives: Swaps receive fixed 9,525,889 9,328,079 34,637 72,912 157,132 70,348 Swaps pay fixed 9,852,498 9,576,893 210,611 110,109 27,306 51,380 Other 2,054,761 1,834,962 25,707 19,971 23,841 18,308 Total customer related derivatives 21,433,148 20,739,934 270,955 202,992 208,279 140,036 Other derivative activities: Foreign exchange contracts 3,708,688 2,764,999 20,053 24,932 26,872 25,521 Interest rate swap agreements 2,176,064 1,749,349 16,685 9,596 1,520 1,631 Interest rate cap agreements 10,851,530 10,932,707 197,801 135,942 — 32,109 Options for interest rate cap agreements 10,825,149 10,906,081 — 32,165 197,548 135,824 Other 979,071 824,786 4,103 5,874 5,924 5,228 Total $ 50,822,874 $ 48,685,902 $ 512,857 $ 413,802 $ 450,915 $ 342,900

FAIR VALUE (Tables)

FAIR VALUE (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis	The following tables present the assets and liabilities that are measured at fair value on a recurring basis by major product category and fair value hierarchy as of March 31, 2018 and December 31, 2017 . (in thousands) Level 1 Level 2 Level 3 Balance at Level 1 Level 2 Level 3 Balance at Financial assets: U.S. Treasury securities $ 174,439 $ 1,200,666 $ — $ 1,375,105 $ 139,615 $ 858,497 $ — $ 998,112 Corporate debt — 2,723 — 2,723 — 11,660 — 11,660 ABS — 138,598 348,634 487,232 — 156,910 350,252 507,162 State and municipal securities — 21 — 21 — 23 — 23 MBS — 11,456,513 — 11,456,513 — 12,885,412 — 12,885,412 Investment in debt securities AFS (3)(6) 174,439 12,798,521 348,634 13,321,594 139,615 13,912,502 350,252 14,402,369 Other investments - trading securities 1 3,023 — 3,024 1 — — 1 RICs HFI (4) — — 167,597 167,597 — — 186,471 186,471 LHFS (1)(5) — 162,468 — 162,468 — 197,691 — 197,691 MSRs (2) — — 160,130 160,130 — — 145,993 145,993 Other assets - derivatives (3) — 586,396 2,254 588,650 — 461,139 2,105 463,244 Total financial assets $ 174,440 $ 13,550,408 $ 678,615 $ 14,403,463 $ 139,616 $ 14,571,332 $ 684,821 $ 15,395,769 Financial liabilities: Other liabilities - derivatives (3) — 570,150 509 570,659 — 427,217 594 427,811 Total financial liabilities $ — $ 570,150 $ 509 $ 570,659 $ — $ 427,217 $ 594 $ 427,811 (1) LHFS disclosed on the Condensed Consolidated Balance Sheet s also includes LHFS that are held at the lower of cost or fair value and are not presented within this table. (2) The Company has total MSRs of $163.1 million and $149.2 million as of March 31, 2018 .and December 31, 2017 , respectively. The Company has elected to account for the majority of its MSR balance using the FVO, while the remainder of the MSRs are accounted for using the lower of cost or fair value and are not presented within this table. (3) Refer to Note 3 for the fair value of investment securities and to Note 12 for the fair values of derivative assets and liabilities, on a further disaggregated basis. (4) RICs collateralized by vehicle titles at SC and RV/marine loans at SBNA. (5) Residential mortgage loans (6) Investment in debt securities AFS disclosed on the Consolidated Balance Sheets at December 31, 2017 included $10.8 million of equity securities valued using the net asset value as a practical expedient that are not presented within this table.
Fair Value Measurements, Nonrecurring	Assets measured at fair value on a nonrecurring basis that were still held on the balance sheet were as follows: (in thousands) Level 1 Level 2 Level 3 Balance at Level 1 Level 2 Level 3 Balance at Impaired commercial LHFI $ — $ 132,339 $ 310,237 $ 442,576 $ — $ 226,832 $ 356,343 $ 583,175 Foreclosed assets — 2,373 104,014 106,387 — 20,011 106,581 126,592 Vehicle inventory — 415,262 — 415,262 — 325,203 — 325,203 LHFS (1) — — 1,798,222 1,798,222 — — 2,324,830 2,324,830 Auto loans impaired due to bankruptcy — 128,641 — 128,641 — 121,578 — 121,578 MSRs — — 9,381 9,381 — — 9,273 9,273 (1) These amounts include $967.8 million and $1.1 billion of personal loans held for sale that are impaired as of March 31, 2018 and December 31, 2017 , respectively.
Increases and Decreases in Value of Certain Assets Measured at Fair Value on Nonrecurring Basis	The following table presents the increases and decreases in value of certain assets that are measured at fair value on a nonrecurring basis for which a fair value adjustment has been included in the Condensed Consolidated Statements of Operations relating to assets held at period-end: Three-Month Period Ended March 31, (in thousands) Statement of Operations Location 2018 2017 Impaired LHFI Provision for credit losses $ (29,312 ) $ (45,772 ) Foreclosed assets Miscellaneous income (1) (2,473 ) (1,742 ) LHFS Provision for credit losses (381 ) — LHFS Miscellaneous income (1) (70,490 ) (66,121 ) Auto loans impaired due to bankruptcy Provision for credit losses (82,145 ) (23,600 ) MSRs Miscellaneous income, net (549 ) 95 (1) These amounts reduce Miscellaneous income.
Rollforward for Recurring Assets and Liabilities	The tables below present the changes in Level 3 balances for the three-month periods ended March 31, 2018 and 2017 , respectively, for those assets and liabilities measured at fair value on a recurring basis. Three-Month Period Ended March 31, 2018 Three-Month Period Ended March 31, 2017 (in thousands) Investments RICs HFI MSRs Derivatives Total Investments RICs HFI MSRs Derivatives Total Balances, beginning of period $ 350,252 $ 186,471 $ 145,993 $ 1,514 $ 684,230 $ 814,567 $ 217,170 $ 146,589 $ (29,000 ) $ 1,149,326 Losses in other comprehensive income (499 ) — — — (499 ) (619 ) — — — (619 ) Gains/(losses) in earnings — 5,276 15,043 134 20,453 — 16,891 1,457 1,194 19,542 Additions/Issuances — 1,349 2,755 — 4,104 — 13,331 5,730 — 19,061 Settlements (1) (1,119 ) (25,499 ) (3,661 ) 97 (30,182 ) (240,494 ) (44,919 ) (4,321 ) 97 (289,637 ) Balances, end of period $ 348,634 $ 167,597 $ 160,130 $ 1,745 $ 678,106 $ 573,454 $ 202,473 $ 149,455 $ (27,709 ) $ 897,673 Changes in unrealized gains (losses) included in earnings related to balances still held at end of period $ — $ 5,276 $ 15,043 $ (14 ) $ 20,305 $ — $ 16,891 $ 1,457 $ (800 ) $ 17,548 (1) Settlements include charge-offs, prepayments, pay downs and maturities.
Quantitative Information on Level 3 Recurring Assets and Liabilities	The following table presents quantitative information about the significant unobservable inputs within significant Level 3 recurring and nonrecurring assets and liabilities at March 31, 2018 and December 31, 2017 . (dollars in thousands) Fair Value at March 31, 2018 Valuation Technique Unobservable Inputs Range Financial Assets: ABS Financing bonds $ 304,851 DCF Discount Rate (1) 2.80% - 3.02% (2.84%) Sale-leaseback securities $ 43,783 Consensus Pricing (2) Offered quotes (3) 117.11 % RICs HFI $ 167,597 DCF Prepayment rate (CPR) (4) 6.66 % Discount Rate (5) 9.50% - 14.50% (12.41%) Recovery Rate (6) 25.00% - 43.00% (41.59%) Personal LHFS $ 967,789 Lower of Market or Income Approach Market Participant View 70.00% - 80.00% Discount Rate 15.00% - 20.00% Default Rate 30.00% - 40.00% Net Principal Payment Rate 50.00% - 70.00% Loss Severity Rate 90.00% - 95.00% RICs HFS $ 620,168 Income Approach Expected Yield 1.00% - 2.00% Expected Life Time Cumulative Loss 4.00% - 6.00% Weighted Average Life 2 -3 years MSRs (11) $ 160,130 DCF Prepayment rate ("CPR") (7) 3.92% - 85.90% (8.20%) Discount Rate (8) 9.75 % Mortgage banking interest rate lock commitments $ 2,253 DCF Pull through percentage (9) 78.00 % MSR value (10) .73% - 1.03% (1.03%) (1) Based on the applicable term and discount index. (2) Consensus pricing refers to fair value estimates that are generally developed using information such as dealer quotes or other third-party valuations or comparable asset prices. (3) Based on the nature of the input, a range or weighted average does not exist. For sale-leaseback securities, the Company owns one security. (4) Based on the analysis of available data from a comparable market securitization of similar assets. (5) Based on the cost of funding of debt issuance and recent historical equity yields. (6) Based on the average severity utilizing reported severity rates and loss severity utilizing available market data from a comparable securitized pool. (7) Average CPR projected from collateral stratified by loan type, note rate and maturity. (8) Based on the nature of the input, a range or weighted average does not exist. (9) Historical weighted average based on principal balance calculated as the percentage of loans originated for sale divided by total commitments less outstanding commitments. (10) MSR value is the estimated value of the servicing right embedded in the underlying loan, expressed in basis points of outstanding unpaid principal balance. (11) Excludes MSR valued on a non-recurring basis for which we do not consider there to be significant unobservable assumptions. NOTE 14. FAIR VALUE (continued) Fair Value at December 31, 2017 Valuation Technique Unobservable Inputs Range Financing bonds ABS Financing bonds $ 304,727 DCF Discount Rate (1) 2.16% - 2.90% (2.28%) Sale-leaseback securities $ 45,525 Consensus Pricing (2) Offered Quotes (3) 120.19 % RICs HFI $ 186,471 DCF CPR (4) 6.66 % Discount Rate (5) 9.50% - 14.50% (12.37%) Recovery Rate (6) 25.00% - 43.00% (41.51%) Personal LHFS $ 1,062,090 Lower of Market or Income Approach Market Participant View 70.00% - 80.00% Discount Rate 15.00% - 20.00% Default Rate 30.00% - 40.00% Net Principal Payment Rate 50.00% - 70.00% Loss Severity Rate 90.00% - 95.00% RICs HFS $ 1,101,049 DCF Discount Rate 3.00% - 6.00% Default Rate 3.00% - 4.00% Prepayment Rate 15.00% - 20.00% Loss Severity Rate 50.00% - 60.00% MSRs (11) $ 145,993 DCF CPR (7) 0.06% - 46.95% (9.80%) Discount Rate (8) 9.90 % Mortgage banking interest rate lock commitments $ 2,105 DCF Pull through percentage (9) 76.98 % MSR Value (10) 0.73% - 1.03% (0.95%) (1) Based on the applicable term and discount index. (2) Consensus pricing refers to fair value estimates that are generally developed using information such as dealer quotes or other third-party valuations or comparable asset prices. (3) Based on the nature of the input, a range or weighted average does not exist. For sale-leaseback securities, the Company owns one security. (4) Based on the analysis of available data from a comparable market securitization of similar assets. (5) Based on the cost of funding of debt issuance and recent historical equity yields. (6) Based on the average severity utilizing reported severity rates and loss severity utilizing available market data from a comparable securitized pool. (7) Average CPR projected from collateral stratified by loan type, note rate and maturity. (8) Based on the nature of the input, a range or weighted average does not exist. (9) Historical weighted average based on principal balance calculated as the percentage of loans originated for sale divided by total commitments less outstanding commitments. (10) MSR value is the estimated value of the servicing right embedded in the underlying loan, expressed in basis points of outstanding unpaid principal balance. (11) Excludes MSR valued on a non-recurring basis for which we do not consider there to be significant unobservable assumptions.
Schedule of Fair Value of Financial Instruments	The carrying amounts and estimated fair values, as well as the level within the fair value hierarchy, of the Company's financial instruments are as follows: March 31, 2018 December 31, 2017 (in thousands) Carrying Value Fair Value Level 1 Level 2 Level 3 Carrying Value Fair Value Level 1 Level 2 Level 3 Financial assets: Cash and amounts due from depository institutions $ 7,900,607 $ 7,900,607 $ 7,900,607 $ — $ — $ 6,519,967 $ 6,519,967 $ 6,519,967 $ — $ — Investment in debt securities AFS 13,321,594 13,321,594 174,439 12,798,521 348,634 14,402,369 14,402,369 139,615 13,912,502 350,252 Investment in debt securities HTM 2,877,357 2,797,698 — 2,797,698 — 1,799,808 1,773,938 — 1,773,938 — Other Investments - Trading Securities 3,024 3,024 1 3,023 — 1 1 1 — — LHFI, net 76,265,119 77,793,838 — 42,339 77,751,499 76,829,277 78,579,144 — 136,832 78,442,312 LHFS 1,960,695 1,960,690 — 162,468 1,798,222 2,522,486 2,522,521 — 197,691 2,324,830 Restricted cash 3,810,962 3,810,962 3,810,962 — — 3,818,807 3,818,807 3,818,807 — — MSRs (1) 163,148 169,511 — — 169,511 149,197 155,266 — — 155,266 Derivatives 588,650 588,650 — 586,396 2,254 463,244 463,244 — 461,139 2,105 Financial liabilities: Deposits 61,841,175 61,598,475 53,343,250 8,255,225 — 60,831,103 60,864,110 55,456,511 5,407,599 — Borrowings and other debt obligations 38,350,245 38,525,215 — 23,769,098 14,756,117 39,003,313 39,335,087 — 23,281,166 16,053,921 Derivatives 570,659 570,659 — 570,150 509 427,811 427,811 — 427,217 594 (1) The Company has elected to account for the majority of its MSR balance using the FVO, while the remainder of the MSRs are accounted for using the lower of cost or fair value. (2) Investment in debt securities AFS disclosed on the Consolidated Balance Sheets at December 31, 2017 included $10.8 million of equity securities valued using net asset value as a practical expedient that are not presented within this table.
Summary of Difference Between Fair Value and Principal Balance of LHFS	The following table summarizes the differences between the fair value and the principal balance of LHFS and RICs measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 . March 31, 2018 December 31, 2017 (in thousands) Fair Value Aggregate Unpaid Principal Balance Difference Fair Value Aggregate Unpaid Principal Balance Difference LHFS (1) $ 162,468 $ 161,818 $ 650 $ 197,691 $ 194,928 $ 2,763 RICs HFI 167,597 190,587 (22,990 ) 186,471 211,580 (25,109 ) Nonaccrual loans 9,420 13,044 (3,624 ) 15,023 19,836 (4,813 ) (1) LHFS disclosed on the Condensed Consolidated Balance Sheet s also includes LHFS that are held at the lower of cost or fair value that are not presented within this table. There were no nonaccrual loans related to the LHFS measured using the FVO.

NON-INTEREST INCOME (Tables)

NON-INTEREST INCOME (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Details of Non-Interest Income	The following table presents the details of the Company's Non-interest income for the following periods: Three-Month Period Ended March 31, (in thousands) 2018 2017 (1) Non-interest income: Consumer and commercial fees $ 138,561 $ 154,349 Lease income 540,896 496,045 Miscellaneous income, net Mortgage banking income, net 16,345 13,174 BOLI 14,568 17,299 Capital market revenue 56,613 45,817 Net gain on sale of operating leases 53,200 22,715 Asset and wealth management fees 43,337 36,501 Loss on sale of non-mortgage loans (43,910 ) (69,768 ) Other miscellaneous (loss)/income, net (15,583 ) 11,767 Net (losses)/gains on sale of investment securities (663 ) 519 Total Non-interest income $ 803,364 $ 728,418 (1) - Prior period amounts have not been adjusted under the modified retrospective method. For further information, see Note 1.
Disaggregation of Revenue from Contracts with Customers	The following table presents the Company's Non-interest income disaggregated by revenue source. Three-Month Period Ended March 31, (in thousands) 2018 2017 (1) Non-interest income: In-scope of Revenue from Contracts with Customers: Depository services (2) $ 58,346 $ 60,440 Commission and trailer fees (3) 29,450 31,168 Interchange income, net (3) 13,473 12,649 Underwriting service fees (3) 24,504 24,600 Asset and wealth management fees (3) 38,203 28,245 Other revenue from contracts with customers (3) 10,002 13,311 Total In-scope of Revenue from Contracts with Customers 173,978 170,413 Out-of-scope of Revenue from Contracts with Customers: Consumer and commercial fees (4) 73,204 87,096 Lease income 540,896 496,045 Miscellaneous income/(loss) (4) 15,949 (25,655 ) Net (losses)/gains on sale of investment securities (663 ) 519 Total Out-of-scope of Revenue from Contracts with Customers 629,386 558,005 Total Non-interest income $ 803,364 $ 728,418 (1) - Prior period amounts have not been adjusted under the modified retrospective method. For further information, see Note 1. (2) - Primarily recorded in the Company's Condensed Consolidated Statements of Operations within Consumer and commercial fees . (3) - Primarily recorded in the Company's Condensed Consolidated Statements of Operations within Miscellaneous income, net. (4) - The balance presented excludes certain revenue streams that are considered in-scope and presented above.

COMMITMENTS, CONTINGENCIES AN43

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of Commitments Amount	The following table details the amount of commitments at the dates indicated: Other Commitments March 31, 2018 December 31, 2017 (in thousands) Commitments to extend credit $ 28,753,073 $ 29,475,864 Letters of credit 1,405,521 1,559,297 Unsecured revolving lines of credit 27,314 27,938 Recourse exposure on sold loans 46,720 46,572 Commitments to sell loans 26,314 19,477 Total commitments $ 30,258,942 $ 31,129,148
Schedule of Commitments to Extend Credit, Expiration Periods	The following table details the amount of commitments to extend credit expiring per period as of the dates indicated: (in thousands) March 31, 2018 December 31, 2017 1 year or less $ 5,084,166 $ 5,858,236 Over 1 year to 3 years 4,838,484 5,381,113 Over 3 years to 5 years 4,747,297 4,478,320 Over 5 years (1) 14,083,126 13,758,195 Total $ 28,753,073 $ 29,475,864 (1) Includes certain commitments to extend credit that do not have a contractual maturity date, but are expected to be outstanding more than 5 years .
Schedule of Letters of Credit, Expiration Periods	The following table details the amount of letters of credit expiring per period as of the dates indicated: (in thousands) March 31, 2018 December 31, 2017 1 year or less $ 702,190 $ 918,191 Over 1 year to 3 years 328,062 286,505 Over 3 years to 5 years 329,005 312,881 Over 5 years 46,264 41,720 Total $ 1,405,521 $ 1,559,297

RELATED PARTY TRANSACTIONS (Tab

RELATED PARTY TRANSACTIONS (Tables)	3 Months Ended
	Mar. 31, 2018
Related Party Transactions [Abstract]
Summary of Contributions from Santander	Contributions from Santander that impact common stock and paid in capital within the Condensed Consolidated Statements of Stockholder's Equity are disclosed within the table below: Three-Month Period Ended March 31, (in thousands) 2018 2017 Cash contribution $ 5,741 $ 9,000 Adjustment to book value of assets purchased on January 1 277 — Deferred tax asset on purchased assets 3,156 — Contribution from shareholder $ 9,174 $ 9,000

BUSINESS SEGMENT INFORMATION (T

BUSINESS SEGMENT INFORMATION (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of Segment Reporting Information	The following tables present certain information regarding the Company’s segments. For the Three-Month Period Ended SHUSA Reportable Segments March 31, 2018 Consumer & Business Banking Commercial Banking GCB Other (2) SC (3) SC Purchase Price Adjustments (4) Eliminations (4) Total (in thousands) Net interest income $ 304,819 $ 154,935 $ 32,690 $ 62,816 $ 921,737 $ 9,895 $ 9,058 $ 1,495,950 Total non-interest income 82,819 33,588 50,639 113,424 531,736 2,686 (11,528 ) 803,364 Provision for / (release of) credit losses 38,389 (9,741 ) (2,055 ) 6,337 458,995 10,609 — 502,534 Total expenses 368,639 84,396 58,143 228,368 694,870 11,729 (2,621 ) 1,443,524 Income/(loss) before income taxes (19,390 ) 113,868 27,241 (58,465 ) 299,608 (9,757 ) 151 353,256 Intersegment revenue/(expense) (1) 678 1,531 (2,281 ) 72 — — — — Total assets 18,857,164 24,318,734 7,062,542 38,944,263 40,045,188 — — 129,227,891 (1) Intersegment revenue/(expense) represents charges or credits for funds used or provided by each of the segments and is included in net interest income. (2) Other includes the results of the entities transferred to the IHC, earnings from non-strategic assets, the investment portfolio, interest expense on the Bank’s and the Company's borrowings and other debt obligations, amortization of intangible assets and certain unallocated corporate income and indirect expenses. (3) Management of SHUSA manages SC by analyzing the pre-Change in Control results of SC as disclosed in this column. (4) Purchase Price Adjustments represents the impact that SC purchase marks had on the results of SC included within the consolidated operations of SHUSA, while eliminations eliminate intercompany transactions. NOTE 18. BUSINESS SEGMENT INFORMATION (continued) For the Three-Month Period Ended SHUSA Reportable Segments March 31, 2017 Consumer & Business Banking Commercial Banking GCB Other (2) SC (3) SC Purchase Price Adjustments (4) Eliminations (4) Total (in thousands) Net interest income $ 262,732 $ 152,306 $ 42,228 $ 56,728 $ 1,042,925 $ 37,305 $ 8,341 $ 1,602,565 Total non-interest income 82,534 14,923 51,336 151,107 434,848 5,454 (11,784 ) 728,418 Provision for / (release of) credit losses 22,451 5,386 (1,364 ) 15,610 635,013 58,349 — 735,445 Total expenses 375,021 78,339 46,608 226,034 621,334 11,872 (6,316 ) 1,352,892 Income/(loss) before income taxes (52,206 ) 83,504 48,320 (33,809 ) 221,426 (27,462 ) 2,873 242,646 Intersegment revenue/(expense) (1) 878 1,301 (2,397 ) 218 — — — — Total assets 17,680,926 25,854,624 9,717,228 43,776,451 39,061,940 — — 136,091,169 (1) Intersegment revenue/(expense) represents charges or credits for funds used or provided by each of the segments and is included in net interest income. (2) Other includes the results of the entities transferred to the IHC, earnings from non-strategic assets, the investment portfolio, interest expense on the Bank’s and the Company's borrowings and other debt obligations, amortization of intangible assets and certain unallocated corporate income and indirect expenses. (3) Management of SHUSA manages SC by analyzing the pre-Change in Control results of SC as disclosed in this column. (4) Purchase Price Adjustments represents the impact that SC purchase marks had on the results of SC included within the consolidated operations of SHUSA, while eliminations eliminate intercompany transactions.

BASIS OF PRESENTATION AND ACC46

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (General) (Details) - SC	3 Months Ended
	Mar. 31, 2018
Noncontrolling Interest [Line Items]
Financing contract term	10 years
Ownership percentage by parent	68.00%
Percentage owned by noncontrolling shareholders	32.00%

BASIS OF PRESENTATION AND ACC47

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Operating Lease Cash Flow Classification) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash from investing activities	$ (979,224)	$ (169,177)
Net cash from operating activities	$ 1,963,089	1,615,055
Correction of error in operating lease cash flow classification
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net cash from investing activities		$ 149,900

BASIS OF PRESENTATION AND ACC48

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Cumulative Effect of Changes) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets - LHFI	$ 80,118,328	[1],[2]	$ 80,746,366	$ 80,740,852	[1],[2]
Other assets	3,994,748	[2],[3]	3,628,835	3,632,427	[2],[3]
Total Assets	129,227,891		128,295,952	128,294,030		$ 136,091,169
Liabilities - Other liabilities	996,685	[2]	798,025	799,403	[2]
Total Liabilities	105,384,810		104,587,021	104,588,399
Stockholders' Equity - Retained earnings	3,685,111		3,465,974	3,462,674
Total Stockholders' Equity	$ 23,843,081		23,708,931	$ 23,705,631		$ 22,599,750	$ 22,378,758
Difference between Revenue Guidance in Effect before and after Topic 606 | ASU 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets - LHFI			5,514
Other assets			(3,592)
Total Assets			1,922
Liabilities - Other liabilities			(1,378)
Total Liabilities			(1,378)
Stockholders' Equity - Retained earnings			3,300
Total Stockholders' Equity			$ 3,300
[1]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.
[3]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.

BASIS OF PRESENTATION AND ACC49

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Impact on Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets - LHFI	$ 80,118,328	[1],[2]	$ 80,746,366	$ 80,740,852	[1],[2]
Other assets	3,994,748	[2],[3]	3,628,835	3,632,427	[2],[3]
Total Assets	129,227,891		128,295,952	128,294,030		$ 136,091,169
Liabilities - Other liabilities	996,685	[2]	798,025	799,403	[2]
Total Liabilities	105,384,810		104,587,021	104,588,399
Stockholders' Equity - Retained earnings	3,685,111		3,465,974	3,462,674
Total Stockholders' Equity	23,843,081		$ 23,708,931	$ 23,705,631		$ 22,599,750	$ 22,378,758
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Assets - LHFI	80,113,022
Other assets	3,998,267
Total Assets	129,226,104
Liabilities - Other liabilities	998,063
Total Liabilities	105,386,188
Stockholders' Equity - Retained earnings	3,681,946
Total Stockholders' Equity	$ 23,839,916
[1]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.
[3]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.

BASIS OF PRESENTATION AND ACC50

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Impact on Statements of Operations) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Consumer and commercial fees		$ 138,561	$ 154,349
Miscellaneous income/(loss)	[1]	124,570	77,505
Total non-interest income		803,364	728,418
Technology, outside service, and marketing expense		152,282	135,509
Loan expense		96,814	98,324
Other administrative expenses		103,554	102,238
Total general and administrative expenses		1,405,662	1,309,816
Income before income tax provision		353,256	242,646
Income tax provision		95,321	78,937
Net income		257,935	163,709
Calculated under Revenue Guidance in Effect before Topic 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Consumer and commercial fees		137,893	154,349
Miscellaneous income/(loss)		118,882
Total non-interest income		797,008	$ 728,418
Technology, outside service, and marketing expense		150,111
Loan expense		99,193
Other administrative expenses		96,782
Total general and administrative expenses		1,399,098
Income before income tax provision		353,464
Income tax provision		95,394
Net income		$ 258,070
[1]	Includes impact of $70.5 million and $66.1 million in 2018 and 2017 of lower of cost or market adjustments on a portion of the Company's LHFS portfolio.

BASIS OF PRESENTATION AND ACC51

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Recently Adopted Accounting Standards, Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity securities from Investments AFS			$ (10,814)
Equity securities in other investments	$ 10,927		$ 0
ASU 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Equity securities from Investments AFS		$ 10,000
Equity securities in other investments		$ 10,000
ASU 2018-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of AOCI to retained earnings	$ (39,100)

BASIS OF PRESENTATION AND ACC52

BASIS OF PRESENTATION AND ACCOUNTING POLICIES (Cumulative Net Impact to Opening Retained Earnings) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	$ 8,455	$ 25,709
Retained Earnings [Member]
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	47,549	$ 14,764
Retained Earnings [Member] | Other adjustments at subsidiary
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	5,573
Retained Earnings [Member] | Cumulative-effect adjustment upon adoption of new accounting standards
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	41,976
Retained Earnings [Member] | Adoption of ASU 2014-09, Revenue Recognition
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	3,300
Retained Earnings [Member] | Adoption of ASU 2016-1, Financial Instruments
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	(418)
Retained Earnings [Member] | Adoption of ASU 2018-02, Statement of Comprehensive Income
Retained Earnings Adjustments [Line Items]
Impact to Retained earnings	$ 39,094

INVESTMENT SECURITIES (Availabl

INVESTMENT SECURITIES (Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Securities:
Amortized Cost	$ 13,670,833	$ 14,635,767
Gross Unrealized Gains	11,867	11,725
Gross Unrealized Loss	(361,106)	(234,309)
Fair Value	13,321,594	14,413,183
Equity Securities:
Amortized Cost		11,428
Gross Unrealized Gains		0
Gross Unrealized Loss		(614)
Fair Value		10,814
U.S. Treasury securities
Debt Securities:
Amortized Cost	1,388,611	1,006,219
Gross Unrealized Gains	4	0
Gross Unrealized Loss	(13,510)	(8,107)
Fair Value	1,375,105	998,112
Corporate debt securities
Debt Securities:
Amortized Cost	2,722	11,639
Gross Unrealized Gains	1	21
Gross Unrealized Loss	0	0
Fair Value	2,723	11,660
Asset-backed securities (“ABS”)
Debt Securities:
Amortized Cost	482,770	501,575
Gross Unrealized Gains	6,341	6,901
Gross Unrealized Loss	(1,879)	(1,314)
Fair Value	487,232	507,162
State and municipal securities
Debt Securities:
Amortized Cost	21	23
Gross Unrealized Gains	0	0
Gross Unrealized Loss	0	0
Fair Value	21	23
GNMA - Residential
Debt Securities:
Amortized Cost	3,999,258	4,745,998
Gross Unrealized Gains	5,022	3,531
Gross Unrealized Loss	(99,197)	(62,524)
Fair Value	3,905,083	4,687,005
GNMA - Commercial
Debt Securities:
Amortized Cost	895,577	1,377,449
Gross Unrealized Gains	82	179
Gross Unrealized Loss	(17,192)	(19,917)
Fair Value	878,467	1,357,711
FHLMC and FNMA - Residential
Debt Securities:
Amortized Cost	6,879,034	6,958,433
Gross Unrealized Gains	417	1,093
Gross Unrealized Loss	(228,635)	(141,393)
Fair Value	6,650,816	6,818,133
FHLMC and FNMA - Commercial
Debt Securities:
Amortized Cost	22,840	23,003
Gross Unrealized Gains	0	0
Gross Unrealized Loss	(693)	(440)
Fair Value	$ 22,147	$ 22,563

INVESTMENT SECURITIES (Held-to-

INVESTMENT SECURITIES (Held-to-maturity Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 2,877,357	$ 1,799,808
Gross Unrealized Gains	0	1,047
Gross Unrealized Loss	(79,659)	(26,917)
Fair Value	2,797,698	1,773,938
GNMA - Residential
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	1,947,672	1,447,669
Gross Unrealized Gains	0	722
Gross Unrealized Loss	(62,258)	(26,150)
Fair Value	1,885,414	1,422,241
GNMA - Commercial
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	929,685	352,139
Gross Unrealized Gains	0	325
Gross Unrealized Loss	(17,401)	(767)
Fair Value	$ 912,284	$ 351,697

INVESTMENT SECURITIES (Securiti

INVESTMENT SECURITIES (Securities Pledged as Collateral) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	$ 6,100	$ 5,900
Collateral with Federal Reserve Bank
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	3,100	3,000
Public fund deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	2,100	2,300
Repurchase agreements, hedging activities and recourse on loan sales
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	225.1	243.8
Deposits with Clearing Organizations
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	347.4	0
Overnight customer deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	$ 325.6	$ 387.9

INVESTMENT SECURITIES (Other In

INVESTMENT SECURITIES (Other Investments) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
AFS investment securities transferred to held to maturity investment securities	$ 1,167,189,000	$ 0
Accrued investment income receivable	44,900,000		$ 47,000,000
FHLB of Pittsburgh and Federal Reserve Bank stock	$ 500,833,000		516,693,000
FHLB Stock, par value (in usd per share)	$ 100
Purchases of FHLB stock	$ 10,200,000
FHLB stock redeemed	25,900,000
Gain (loss) on redemption of FHLB stock	0
Purchase of FRB stock	0
Equity securities	$ 10,927,000		$ 0

INVESTMENT SECURITIES (Contract

INVESTMENT SECURITIES (Contractual Maturity of Available-for-sale Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 540,050
Due after 1 year but within 5 years	1,214,394
Due after 5 years but within 10 years	169,152
Due after 10 years	11,747,237
Amortized Cost	13,670,833	$ 14,635,767
Fair Value
Due within one year	539,712
Due after 1 year but within 5 years	1,207,322
Due after 5 years but within 10 years	165,500
Due after 10 years	11,409,060
Fair Value	$ 13,321,594	$ 14,413,183

INVESTMENT SECURITIES (Contra58

INVESTMENT SECURITIES (Contractual Maturity of Held-to-maturity Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 0
Due after 1 year but within 5 years	0
Due after 5 years but within 10 years	0
Due after 10 years	2,877,357
Amortized Cost	2,877,357	$ 1,799,808
Fair Value
Due within one year	0
Due after 1 year but within 5 years	0
Due after 5 years but within 10 years	0
Due after 10 years	2,797,698
Fair Value	$ 2,797,698	$ 1,773,938

INVESTMENT SECURITIES (Gross Un

INVESTMENT SECURITIES (Gross Unrealized Loss and Fair Value of Available-for-sale Debt Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value
Less than 12 months	$ 6,920,400	$ 6,702,254
12 months or longer	5,044,372	5,982,268
Unrealized Losses
Less than 12 months	(135,664)	(61,328)
12 months or longer	(225,442)	(172,981)
U.S. Treasury securities
Fair Value
Less than 12 months	1,097,855	998,112
12 months or longer	247,265	0
Unrealized Losses
Less than 12 months	(8,900)	(8,107)
12 months or longer	(4,610)	0
Corporate debt securities
Fair Value
Less than 12 months	1,086	0
12 months or longer	13	0
Unrealized Losses
Less than 12 months	0	0
12 months or longer	0	0
ABS
Fair Value
Less than 12 months	46,388	8,013
12 months or longer	92,232	103,559
Unrealized Losses
Less than 12 months	(260)	(125)
12 months or longer	(1,619)	(1,189)
GNMA - Residential
Fair Value
Less than 12 months	1,246,568	1,236,716
12 months or longer	1,807,860	2,583,955
Unrealized Losses
Less than 12 months	(28,253)	(8,600)
12 months or longer	(70,944)	(53,924)
GNMA - Commercial
Fair Value
Less than 12 months	817,989	1,022,452
12 months or longer	34,670	251,209
Unrealized Losses
Less than 12 months	(16,664)	(11,492)
12 months or longer	(528)	(8,425)
FHLMC and FNMA - Residential
Fair Value
Less than 12 months	3,703,742	3,429,678
12 months or longer	2,846,957	3,017,533
Unrealized Losses
Less than 12 months	(81,349)	(32,899)
12 months or longer	(147,286)	(108,494)
FHLMC and FNMA - Commercial
Fair Value
Less than 12 months	6,772	6,948
12 months or longer	15,375	15,614
Unrealized Losses
Less than 12 months	(238)	(103)
12 months or longer	$ (455)	(337)
Equity securities
Equity Securities:
Fair Value, Less than 12 months		335
Unrealized Losses, Less than 12 months		(2)
Fair Value, 12 months or longer		10,398
Unrealized Losses, 12 months or longer		$ (612)

INVESTMENT SECURITIES (Gross 60

INVESTMENT SECURITIES (Gross Unrealized Loss and Fair Value of Held-to-maturity Debt Securities) (Details) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value
Less than 12 months	$ 1,267,624	$ 553,273
12 months or longer	1,530,073	739,612
Unrealized Losses
Less than 12 months	(33,697)	(7,186)
12 months or longer	(45,962)	(19,731)
GNMA - Residential
Fair Value
Less than 12 months	642,688	434,322
12 months or longer	1,242,725	739,612
Unrealized Losses
Less than 12 months	(20,624)	(6,419)
12 months or longer	(41,634)	(19,731)
GNMA - Commercial
Fair Value
Less than 12 months	624,936	118,951
12 months or longer	287,348	0
Unrealized Losses
Less than 12 months	(13,073)	(767)
12 months or longer	$ (4,328)	$ 0

INVESTMENT SECURITIES (Other-Th

INVESTMENT SECURITIES (Other-Than-Temporary Impairment) (Details)	3 Months Ended
	Mar. 31, 2018USD ($)security	Mar. 31, 2017USD ($)
Investments, Debt and Equity Securities [Abstract]
OTTI in earnings related to investment securities | $	$ 0	$ 0
Number of securities in unrealized loss position | security	531

INVESTMENT SECURITIES (Gains (L

INVESTMENT SECURITIES (Gains (Losses) and Proceeds on Sale of Securities) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]
Proceeds from the sales of debt securities AFS	$ 39,446,000	$ 0
Gross realized gains	0	0
Gross realized losses	(18,000)	0
OTTI	0	0
Net realized gains/(losses)	(18,000)	$ 0
Book value	13,321,594,000		$ 14,413,183,000
MBS
Schedule of Available-for-sale Securities [Line Items]
Gross realized losses	(18,000)
Book value	$ 319,000

INVESTMENT SECURITIES (Schedule

INVESTMENT SECURITIES (Schedule of Other Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
FHLB of Pittsburgh and Federal Reserve Bank stock	$ 500,833	$ 516,693
Low Income Housing Tax Credit investments (LIHTC)	96,899	88,170
Equity Securities not held for trading	10,927	0
CDs with a maturity greater than 90 days	153,358	54,000
Trading Securities	3,024	1
Total	$ 765,041	$ 658,864

INVESTMENT SECURITIES (Realized

INVESTMENT SECURITIES (Realized and Unrealized Gains (Losses) on Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Net gains/(losses) on equity securities	$ 47	$ (18)
Less: net gains/(losses) recognized during the period on equity securities sold during the period	0	0
Unrealized gains/(losses) recognized during the reporting period on equity securities still held at the reporting period date	$ 47	$ (18)

LOANS AND ALLOWANCE FOR CREDI65

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details) - USD ($) $ in Thousands		3 Months Ended			12 Months Ended
		Mar. 31, 2018		Mar. 31, 2017	Dec. 31, 2017		Dec. 31, 2016	Jan. 01, 2018
Loans Receivable [Line Items]
Loans pledged as collateral		$ 47,300,000			$ 50,800,000
Loans held-for-sale	[1]	1,960,695			2,522,486
Accrued interest receivable		496,144			563,607
Loans and leases receivable		80,118,328	[2],[3]		80,740,852	[2],[3]		$ 80,746,366
Financing receivable		$ 82,079,023			83,263,338
Percentage of payment needed on past due loans for qualification		90.00%
Minimum amount for commercial non-accrual loans (in excess of)		$ 1,000
Troubled debt restructurings		$ 6,597,359			6,807,172
TDR, threshold period of sustained repayment performance		6 months
TDR, threshold period loan needed to remain current prior to modification to remain on accrual status		6 months
TDRs, number of days past due after modification considered to have subsequently defaulted		90 days
Performing
Loans Receivable [Line Items]
Interest income		$ 261,200			795,400
Troubled debt restructurings		5,811,401			5,824,304
SC | Chrysler Capital Loans
Loans Receivable [Line Items]
Loan originations		$ 2,000,000		$ 1,600,000
SC | Chrysler Capital Loans | Accounts Receivable | Credit Concentration Risk
Loans Receivable [Line Items]
Percentage of loan origination		46.00%		42.00%
Loans receivable
Loans Receivable [Line Items]
Accrued interest receivable		$ 450,000			515,900
Mortgage warehouse facilities
Loans Receivable [Line Items]
Loans and leases receivable		499,200
Proceeds from sale of receivables		515,800
Gain from sale of receivables		16,700
Retail installment contracts and auto loans | SC | Chrysler Capital Leases
Loans Receivable [Line Items]
Financing receivable		$ 7,000,000			$ 8,200,000
Retail installment contracts and auto loans | SC | Chrysler Capital Leases | Accounts Receivable | Credit Concentration Risk
Loans Receivable [Line Items]
Percentage of loan origination		31.00%			37.00%
Retail installment contracts, originated
Loans Receivable [Line Items]
Percentage of payment needed on past due loans for qualification		90.00%					50.00%
Retail installment contracts
Loans Receivable [Line Items]
TDRs, number of days past due after modification considered to have subsequently defaulted		120 days
Consumer
Loans Receivable [Line Items]
Loans and leases receivable		$ 41,913,869			$ 41,574,142
Consumer | Personal unsecured loans
Loans Receivable [Line Items]
LHFS		967,800			1,100,000
Financing receivable		2,229,027			2,347,767
Consumer | Retail installment contracts and auto loans
Loans Receivable [Line Items]
Loans and leases receivable		38,561			18,142
Consumer | Retail installment contracts, originated
Loans Receivable [Line Items]
Loans and leases receivable		23,545,166			23,063,282
Commercial Portfolio Segment [Member]
Loans Receivable [Line Items]
Loans and leases receivable		$ 38,204,459			$ 39,166,710
[1]	Includes $162.5 million and $197.7 million of loans recorded at the fair value option ("FVO") at March 31, 2018 and December 31, 2017, respectively.
[2]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[3]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

LOANS AND ALLOWANCE FOR CREDI66

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Loan and Lease Portfolio Composition) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017
Loans Receivable [Line Items]
Total loans held for investment	$ 80,118,328	[1],[2]	$ 80,746,366	$ 80,740,852	[1],[2]
Loans held for investment with fixed rate of interest	51,066,020			50,653,790
Loans held for investment with variable rate of interest	$ 29,052,308			$ 30,087,062
Loans held for investment, percent of total loans	100.00%			100.00%
Loans held for investment with fixed rate of interest, percent of total loans	63.70%			62.70%
Loans held for investment with variable rate of interest, percent of total loans	36.30%			37.30%
Net increase in loan balances	$ 1,400,000			$ 1,300,000
Commercial
Loans Receivable [Line Items]
Total loans held for investment	$ 38,204,459			$ 39,166,710
Loans held for investment, percent of total loans	47.70%			48.40%
Commercial | Commercial real estate (CRE) loans
Loans Receivable [Line Items]
Total loans held for investment	$ 9,072,529			$ 9,279,225
Loans held for investment, percent of total loans	11.30%			11.50%
Commercial | Commercial and industrial loans
Loans Receivable [Line Items]
Total loans held for investment	$ 13,712,573			$ 14,438,311
Loans held for investment, percent of total loans	17.10%			17.90%
Commercial | Multifamily loans
Loans Receivable [Line Items]
Total loans held for investment	$ 8,081,924			$ 8,274,435
Loans held for investment, percent of total loans	10.10%			10.10%
Commercial | Other commercial
Loans Receivable [Line Items]
Total loans held for investment	$ 7,337,433			$ 7,174,739
Loans held for investment, percent of total loans	9.20%			8.90%
Consumer
Loans Receivable [Line Items]
Total loans held for investment	$ 41,913,869			$ 41,574,142
Loans held for investment, percent of total loans	52.30%			51.60%
Consumer | RICs and auto loans - originated
Loans Receivable [Line Items]
Total loans held for investment	$ 23,583,727			$ 23,081,424
Consumer loans secured by real estate
Loans Receivable [Line Items]
Total loans held for investment	$ 14,986,741			$ 14,754,498
Loans held for investment, percent of total loans	18.70%			18.30%
Consumer loans secured by real estate | Residential mortgages
Loans Receivable [Line Items]
Total loans held for investment	$ 9,198,059			$ 8,846,765
Loans held for investment, percent of total loans	11.50%			11.00%
Consumer loans secured by real estate | Home equity loans and lines of credit
Loans Receivable [Line Items]
Total loans held for investment	$ 5,788,682			$ 5,907,733
Loans held for investment, percent of total loans	7.20%			7.30%
Consumer loans not secured by real estate | RICs and auto loans - originated
Loans Receivable [Line Items]
Total loans held for investment	$ 23,583,727			$ 23,081,424
Loans held for investment, percent of total loans	29.40%			28.60%
Consumer loans not secured by real estate | RICs and auto loans - purchased
Loans Receivable [Line Items]
Total loans held for investment	$ 1,515,086			$ 1,834,868
Loans held for investment, percent of total loans	1.90%			2.30%
Consumer loans not secured by real estate | Personal unsecured loans
Loans Receivable [Line Items]
Total loans held for investment	$ 1,261,238			$ 1,285,677
Loans held for investment, percent of total loans	1.60%			1.60%
Consumer loans not secured by real estate | Other consumer
Loans Receivable [Line Items]
Total loans held for investment	$ 567,077			$ 617,675
Loans held for investment, percent of total loans	0.70%			0.80%
[1]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

LOANS AND ALLOWANCE FOR CREDI67

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Retail Installment Contracts and Auto Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017
Loans Receivable [Line Items]
Total loans held for investment	$ 80,118,328	[1],[2]	$ 80,746,366	$ 80,740,852	[1],[2]
Consumer
Loans Receivable [Line Items]
Total loans held for investment	41,913,869			41,574,142
Consumer | Retail installment contracts and auto loans
Loans Receivable [Line Items]
Total loans held for investment	25,098,813			24,916,292
Consumer | Purchased
Loans Receivable [Line Items]
Unpaid principal balance (UPB)	1,592,887			1,929,548
UPB, FVO	19,773			24,926
Total UPB	1,612,660			1,954,474
Purchase marks	(97,574)			(119,606)
Total loans held for investment	1,515,086			1,834,868
Purchase marks, FVO	4,400			5,500
Consumer | Retail installment contracts, originated
Loans Receivable [Line Items]
Total UPB	23,817,893			23,373,202
Net discount	(272,727)			(309,920)
Total loans held for investment	23,545,166			23,063,282
Consumer | Auto loans
Loans Receivable [Line Items]
Total loans held for investment	38,561			18,142
Consumer | Retail installment contracts and auto loans, originated
Loans Receivable [Line Items]
Total loans held for investment	$ 23,583,727			$ 23,081,424
[1]	LHFI includes $167.6 million and $186.5 million of loans recorded at fair value at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

LOANS AND ALLOWANCE FOR CREDI68

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Rollforward of Allowance for Credit Losses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	$ 3,911,575	$ 3,814,464
(Release of) / Provision for loan and lease losses	521,780	737,335
Charge-offs	(1,251,896)	(1,263,453)
Recoveries	671,750	634,517
Charge-offs, net of recoveries	(580,146)	(628,936)
ALLL, end of period	3,853,209	3,922,863
Reserve for Unfunded Lending Commitments Roll Forward [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	109,111	122,419
(Release of)/Provision for reserve for unfunded lending commitments	(19,246)	(1,890)
Loss on unfunded lending commitments		(133)
Reserve for unfunded lending commitments, end of period	89,865	120,396
Total ACL, end of period	3,943,074	4,043,259
Ending balance, individually evaluated for impairment	1,723,923	1,618,459
Ending balance, collectively evaluated for impairment	2,129,286	2,304,404
Financing receivables:
Ending balance	82,079,023	85,817,859
Ending balance, evaluated under the FVO or lower of cost or fair value	1,994,068	2,111,986
Ending balance, individually evaluated for impairment	6,884,359	6,715,810
Ending balance, collectively evaluated for impairment	73,200,596	76,990,063
Commercial
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	443,796	449,835
(Release of) / Provision for loan and lease losses	41,232	18,777
Charge-offs	(32,960)	(26,173)
Recoveries	10,006	10,580
Charge-offs, net of recoveries	(22,954)	(15,593)
ALLL, end of period	462,074	453,019
Reserve for Unfunded Lending Commitments Roll Forward [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	108,805	121,613
(Release of)/Provision for reserve for unfunded lending commitments	(19,263)	(1,860)
Loss on unfunded lending commitments		(133)
Reserve for unfunded lending commitments, end of period	89,542	119,620
Total ACL, end of period	551,616	572,639
Ending balance, individually evaluated for impairment	94,993	99,914
Ending balance, collectively evaluated for impairment	367,081	353,105
Financing receivables:
Ending balance	38,400,180	42,415,806
Ending balance, evaluated under the FVO or lower of cost or fair value	195,721	103,834
Ending balance, individually evaluated for impairment	568,557	675,116
Ending balance, collectively evaluated for impairment	37,635,902	41,636,856
Consumer
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	3,420,756	3,317,606
(Release of) / Provision for loan and lease losses	480,548	718,558
Charge-offs	(1,218,936)	(1,237,280)
Recoveries	661,744	623,937
Charge-offs, net of recoveries	(557,192)	(613,343)
ALLL, end of period	3,344,112	3,422,821
Reserve for Unfunded Lending Commitments Roll Forward [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	306	806
(Release of)/Provision for reserve for unfunded lending commitments	17	(30)
Loss on unfunded lending commitments		0
Reserve for unfunded lending commitments, end of period	323	776
Total ACL, end of period	3,344,435	3,423,597
Ending balance, individually evaluated for impairment	1,628,930	1,518,545
Ending balance, collectively evaluated for impairment	1,715,182	1,904,276
Financing receivables:
Ending balance	43,678,843	43,402,053
Ending balance, evaluated under the FVO or lower of cost or fair value	1,798,347	2,008,152
Ending balance, individually evaluated for impairment	6,315,802	6,040,694
Ending balance, collectively evaluated for impairment	35,564,694	35,353,207
Consumer | Total
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	3,163,211	3,097,219
(Release of) / Provision for loan and lease losses	471,329	686,649
Charge-offs	(1,184,025)	(1,196,739)
Recoveries	654,851	615,976
Charge-offs, net of recoveries	(529,174)	(580,763)
ALLL, end of period	3,105,366	3,203,105
Consumer | Purchased
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	384,167	559,092
(Release of) / Provision for loan and lease losses	(15,830)	26,125
Charge-offs	(105,510)	(188,686)
Recoveries	59,899	98,690
Charge-offs, net of recoveries	(45,611)	(89,996)
ALLL, end of period	322,726	495,221
Consumer | Originated
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	2,779,044	2,538,127
(Release of) / Provision for loan and lease losses	487,159	660,524
Charge-offs	(1,078,515)	(1,008,053)
Recoveries	594,952	517,286
Charge-offs, net of recoveries	(483,563)	(490,767)
ALLL, end of period	2,782,640	2,707,884
Unallocated
Allowance for Loan Losses [Roll Forward]
Allowance for loan and lease losses (ALLL), beginning of period	47,023	47,023
(Release of) / Provision for loan and lease losses	0	0
Charge-offs	0	0
Recoveries	0	0
Charge-offs, net of recoveries	0	0
ALLL, end of period	47,023	47,023
Reserve for Unfunded Lending Commitments Roll Forward [Roll Forward]
Reserve for unfunded lending commitments, beginning of period	0	0
(Release of)/Provision for reserve for unfunded lending commitments	0	0
Loss on unfunded lending commitments		0
Reserve for unfunded lending commitments, end of period	0	0
Total ACL, end of period	47,023	47,023
Ending balance, individually evaluated for impairment	0	0
Ending balance, collectively evaluated for impairment	47,023	47,023
Financing receivables:
Ending balance	0	0
Ending balance, evaluated under the FVO or lower of cost or fair value	0	0
Ending balance, individually evaluated for impairment	0	0
Ending balance, collectively evaluated for impairment	$ 0	$ 0

LOANS AND ALLOWANCE FOR CREDI69

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Non-accrual Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 2,681,624	$ 2,949,997
Foreclosed and other repossessed assets	172,683	212,882
Nonperforming
Financing Receivable, Recorded Investment, Past Due [Line Items]
Other real estate owned (OREO)	126,714	130,777
Repossessed vehicles	171,359	210,692
Foreclosed and other repossessed assets	1,324	2,190
Total OREO and other repossessed assets	299,397	343,659
Total non-performing assets	2,981,021	3,293,656
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	426,722	464,533
Commercial | CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	132,941	139,236
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	203,738	230,481
Commercial | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	10,569	11,348
Commercial | Other commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	79,474	83,468
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,254,902	2,485,464
Consumer | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	257,995	265,436
Consumer | Home equity loans and lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	131,036	134,162
Consumer | RICs and auto loans - originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	1,644,605	1,816,226
Consumer | RICs and auto loans - purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	207,328	256,617
Consumer | Personal unsecured loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	2,820	2,366
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Non-accrual loans	$ 11,118	$ 10,657

LOANS AND ALLOWANCE FOR CREDI70

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Age Analysis of Past Due Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 4,307,465	$ 5,321,431
Current	77,771,558	77,941,907
Total Financing Receivables	82,079,023	83,263,338
Recorded Investment Greater than 90 Days and Accruing	81,455	96,461
30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,509,299	4,349,047
90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	798,166	972,384
Commercial | CRE
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	108,051	125,698
Current	8,964,478	9,153,527
Total Financing Receivables	9,072,529	9,279,225
Recorded Investment Greater than 90 Days and Accruing	0	0
Commercial | CRE | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	33,982	25,174
Commercial | CRE | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	74,069	100,524
Commercial | Commercial and industrial loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	173,213	125,508
Current	13,735,081	14,461,981
Total Financing Receivables	13,908,294	14,587,489
Recorded Investment Greater than 90 Days and Accruing	0	0
LHFS	195,700	149,200
Commercial | Commercial and industrial loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	90,510	49,584
Commercial | Commercial and industrial loans | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	82,703	75,924
Commercial | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	16,446	6,552
Current	8,065,478	8,267,883
Total Financing Receivables	8,081,924	8,274,435
Recorded Investment Greater than 90 Days and Accruing	0	0
Commercial | Multifamily | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13,443	3,562
Commercial | Multifamily | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,003	2,990
Commercial | Other commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	52,141	37,380
Current	7,285,292	7,137,359
Total Financing Receivables	7,337,433	7,174,739
Recorded Investment Greater than 90 Days and Accruing	0	0
Commercial | Other commercial | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	48,961	34,021
Commercial | Other commercial | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,180	3,359
Consumer | Residential mortgages
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	380,882	428,335
Current	8,994,194	8,628,600
Total Financing Receivables	9,375,076	9,056,935
Recorded Investment Greater than 90 Days and Accruing	15	0
LHFS	177,000	210,200
Consumer | Residential mortgages | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	189,872	217,558
Consumer | Residential mortgages | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	191,010	210,777
Consumer | Home equity loans and lines of credit
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	134,835	142,894
Current	5,653,847	5,764,839
Total Financing Receivables	5,788,682	5,907,733
Recorded Investment Greater than 90 Days and Accruing	0	0
Consumer | Home equity loans and lines of credit | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	47,614	50,919
Consumer | Home equity loans and lines of credit | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	87,221	91,975
Consumer | RICs and auto loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
LHFS	620,200	1,100,000
Consumer | RICs and auto loans - originated
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,863,175	3,732,766
Current	21,340,720	20,449,706
Total Financing Receivables	24,203,895	24,182,472
Recorded Investment Greater than 90 Days and Accruing	0	0
Consumer | RICs and auto loans - originated | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,634,364	3,405,721
Consumer | RICs and auto loans - originated | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	228,811	327,045
Consumer | RICs and auto loans - purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	354,365	492,751
Current	1,160,721	1,342,117
Total Financing Receivables	1,515,086	1,834,868
Recorded Investment Greater than 90 Days and Accruing	0	0
Consumer | RICs and auto loans - purchased | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	330,226	452,235
Consumer | RICs and auto loans - purchased | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	24,139	40,516
Consumer | Personal unsecured loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	190,155	190,448
Current	2,038,872	2,157,319
Total Financing Receivables	2,229,027	2,347,767
Recorded Investment Greater than 90 Days and Accruing	81,440	96,461
LHFS	967,800	1,100,000
Consumer | Personal unsecured loans | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	99,826	85,394
Consumer | Personal unsecured loans | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	90,329	105,054
Consumer | Other consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	34,202	39,099
Current	532,875	578,576
Total Financing Receivables	567,077	617,675
Recorded Investment Greater than 90 Days and Accruing	0	0
Consumer | Other consumer | 30-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20,501	24,879
Consumer | Other consumer | 90 Days or Greater
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 13,701	$ 14,220

LOANS AND ALLOWANCE FOR CREDI71

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Impaired Loans) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, recorded investment	$ 6,918,658	$ 7,164,184
Impaired financing receivable, upb	7,257,629	7,601,163
Impaired financing receivable, related specific reserves	1,723,923	1,854,154
Impaired financing receivables, average recorded investment	7,041,425	6,778,426
Commercial
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, recorded investment	553,221	577,963
Impaired financing receivable, upb	594,192	685,000
Impaired financing receivable, related specific reserves	94,993	102,326
Impaired financing receivables, average recorded investment	565,594	587,630
Commercial | CRE
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	125,669	126,406
Impaired financing receivable with related allowance recorded, recorded investment	99,787	97,680
Impaired financing receivable with no related allowance recorded, upb	151,164	174,842
Impaired financing receivable with related allowance recorded, upb	112,480	117,730
Impaired financing receivable, related specific reserves	15,976	18,523
Impaired financing receivable with no related allowance recorded, average recorded investment	126,039	139,063
Impaired financing receivable with related allowance recorded, average recorded investment	98,734	118,492
Commercial | Commercial and industrial loans
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	51,175	82,541
Impaired financing receivable with related allowance recorded, recorded investment	184,297	176,769
Impaired financing receivable with no related allowance recorded, upb	53,140	96,324
Impaired financing receivable with related allowance recorded, upb	185,115	200,382
Impaired financing receivable, related specific reserves	55,322	59,696
Impaired financing receivable with no related allowance recorded, average recorded investment	66,858	75,338
Impaired financing receivable with related allowance recorded, average recorded investment	180,533	196,674
Commercial | Multifamily loans
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	11,929	9,887
Impaired financing receivable with related allowance recorded, recorded investment	4,791	6,201
Impaired financing receivable with no related allowance recorded, upb	11,929	10,838
Impaired financing receivable with related allowance recorded, upb	4,791	6,201
Impaired financing receivable, related specific reserves	19	313
Impaired financing receivable with no related allowance recorded, average recorded investment	10,908	10,129
Impaired financing receivable with related allowance recorded, average recorded investment	5,496	4,566
Commercial | Other commercial
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	1,877	767
Impaired financing receivable with related allowance recorded, recorded investment	73,696	77,712
Impaired financing receivable with no related allowance recorded, upb	1,877	911
Impaired financing receivable with related allowance recorded, upb	73,696	77,772
Impaired financing receivable, related specific reserves	23,676	23,794
Impaired financing receivable with no related allowance recorded, average recorded investment	1,322	903
Impaired financing receivable with related allowance recorded, average recorded investment	75,704	42,465
Consumer
Financing Receivable, Impaired [Line Items]
Impaired financing receivable, recorded investment	6,365,437	6,586,221
Impaired financing receivable, upb	6,663,437	6,916,163
Impaired financing receivable, related specific reserves	1,628,930	1,751,828
Impaired financing receivables, average recorded investment	6,475,831	6,190,796
Consumer | Residential mortgages
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	147,333	107,320
Impaired financing receivable with related allowance recorded, recorded investment	279,472	322,092
Impaired financing receivable with no related allowance recorded, upb	198,200	128,458
Impaired financing receivable with related allowance recorded, upb	319,018	392,833
Impaired financing receivable, related specific reserves	38,586	40,963
Impaired financing receivable with no related allowance recorded, average recorded investment	127,327	141,195
Impaired financing receivable with related allowance recorded, average recorded investment	300,782	303,361
Consumer | Home equity loans and lines of credit
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	53,101	52,397
Impaired financing receivable with related allowance recorded, recorded investment	64,004	64,827
Impaired financing receivable with no related allowance recorded, upb	55,368	54,421
Impaired financing receivable with related allowance recorded, upb	76,156	77,435
Impaired financing receivable, related specific reserves	5,078	4,770
Impaired financing receivable with no related allowance recorded, average recorded investment	52,749	50,635
Impaired financing receivable with related allowance recorded, average recorded investment	64,416	57,345
Consumer | RICs and auto loans - originated
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	11
Impaired financing receivable with related allowance recorded, recorded investment	4,736,587	4,788,299
Impaired financing receivable with no related allowance recorded, upb	11
Impaired financing receivable with related allowance recorded, upb	4,787,816	4,847,929
Impaired financing receivable, related specific reserves	1,281,642	1,350,022
Impaired financing receivable with no related allowance recorded, average recorded investment	6
Impaired financing receivable with related allowance recorded, average recorded investment	4,762,443	4,029,808
Consumer | RICs and auto loans - purchased
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	13,252	16,192
Impaired financing receivable with related allowance recorded, recorded investment	1,003,764	1,166,476
Impaired financing receivable with no related allowance recorded, upb	17,010	20,783
Impaired financing receivable with related allowance recorded, upb	1,134,415	1,318,306
Impaired financing receivable, related specific reserves	294,669	347,663
Impaired financing receivable with no related allowance recorded, average recorded investment	14,722	25,283
Impaired financing receivable with related allowance recorded, average recorded investment	1,085,120	1,511,212
Consumer | Personal unsecured loans
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	31,972	30,992
Impaired financing receivable with related allowance recorded, recorded investment	16,590	16,477
Impaired financing receivable with no related allowance recorded, upb	31,972	30,992
Impaired financing receivable with related allowance recorded, upb	16,842	16,661
Impaired financing receivable, related specific reserves	6,934	6,259
Impaired financing receivable with no related allowance recorded, average recorded investment	31,482	28,500
Impaired financing receivable with related allowance recorded, average recorded investment	16,534	16,668
Consumer | Other consumer
Financing Receivable, Impaired [Line Items]
Impaired financing receivable with no related allowance recorded, recorded investment	8,559	9,557
Impaired financing receivable with related allowance recorded, recorded investment	10,792	11,592
Impaired financing receivable with no related allowance recorded, upb	12,183	13,055
Impaired financing receivable with related allowance recorded, upb	14,446	15,290
Impaired financing receivable, related specific reserves	2,021	2,151
Impaired financing receivable with no related allowance recorded, average recorded investment	9,058	14,446
Impaired financing receivable with related allowance recorded, average recorded investment	$ 11,192	$ 12,343

LOANS AND ALLOWANCE FOR CREDI72

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Lending Asset Quality Indicators) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$ 38,400,180	$ 39,315,888
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	35,809,743	36,641,228
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	1,626,749	1,722,400
Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	785,559	783,065
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	178,129	169,195
CRE
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	9,072,529	9,279,225
CRE | Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	8,120,502	8,281,626
CRE | Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	617,232	645,835
CRE | Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	302,262	317,510
CRE | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	32,533	34,254
Commercial and industrial loans
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	13,908,294	14,587,489
Commercial and industrial loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	12,576,220	13,176,248
Commercial and industrial loans | Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	831,097	941,683
Commercial and industrial loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	417,553	398,325
Commercial and industrial loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	83,424	71,233
Multifamily
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	8,081,924	8,274,435
Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	7,900,191	8,123,727
Multifamily | Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	135,106	105,225
Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	46,627	45,483
Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	0	0
Remaining commercial
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	7,337,433	7,174,739
Remaining commercial | Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	7,212,830	7,059,627
Remaining commercial | Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	43,314	29,657
Remaining commercial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	19,117	21,747
Remaining commercial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Commercial loans	$ 62,172	$ 63,708

LOANS AND ALLOWANCE FOR CREDI73

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Consumer Lending Asset Quality Indicators - Credit Score) (Details) - Consumer - RICs and auto loans - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Loans Receivable [Line Items]
Financing receivable	$ 25,718,981	$ 26,017,340
Percentage of total loans, Retail installment contracts and auto loans	100.00%	100.00%
LHFS	$ 620,200	$ 1,100,000
FICO score not applicable
Loans Receivable [Line Items]
Financing receivable	$ 4,016,803	$ 4,530,238
Percentage of total loans, Retail installment contracts and auto loans	15.60%	17.40%
FICO score less than 600
Loans Receivable [Line Items]
Financing receivable	$ 13,532,536	$ 13,395,203
Percentage of total loans, Retail installment contracts and auto loans	52.70%	51.40%
FICO score of 600 to 639
Loans Receivable [Line Items]
Financing receivable	$ 4,410,604	$ 4,332,278
Percentage of total loans, Retail installment contracts and auto loans	17.10%	16.70%
FICO score of 640 or greater
Loans Receivable [Line Items]
Financing receivable	$ 3,759,038	$ 3,759,621
Percentage of total loans, Retail installment contracts and auto loans	14.60%	14.50%

LOANS AND ALLOWANCE FOR CREDI74

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Consumer Lending Asset Quality Indicators - FICO and CLTV Range) (Details) - Consumer - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	$ 9,375,076	$ 9,056,935
Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	5,788,682	5,907,733
LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	267,593	372,997
LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	236,035	210,736
LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	5,436,393	5,229,768
LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	3,734,507	3,789,095
LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	2,129,839	1,977,764
LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	1,566,525	1,613,086
LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	776,553	740,731
LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	703,126	663,899
LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	161,937	174,109
LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	22,910	25,345
LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	38,662	46,431
LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	89,678	120,707
FICO score not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	274,495	380,089
FICO score not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	192,618	155,464
FICO score not applicable | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	266,671	372,116
FICO score not applicable | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	190,747	154,690
FICO score not applicable | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	6,616	6,759
FICO score not applicable | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	1,393	536
FICO score not applicable | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,208	1,214
FICO score not applicable | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	478	238
FICO score not applicable | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score not applicable | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score not applicable | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score not applicable | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score not applicable | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score not applicable | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	0	0
FICO score less than 600 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	336,638	343,842
FICO score less than 600 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	299,742	302,863
FICO score less than 600 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	13	21
FICO score less than 600 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	7,436	8,064
FICO score less than 600 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	223,009	220,737
FICO score less than 600 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	195,852	190,657
FICO score less than 600 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	54,447	55,108
FICO score less than 600 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	69,172	64,554
FICO score less than 600 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	33,835	35,617
FICO score less than 600 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	21,303	23,834
FICO score less than 600 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	19,838	16,634
FICO score less than 600 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	2,609	2,505
FICO score less than 600 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,422	6,020
FICO score less than 600 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	7,444	22,954
FICO score of 600 to 639 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	272,353	276,680
FICO score of 600 to 639 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	224,997	244,325
FICO score of 600 to 639 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	44	45
FICO score of 600 to 639 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	4,896	6,276
FICO score of 600 to 639 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	155,786	155,920
FICO score of 600 to 639 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	150,132	158,461
FICO score of 600 to 639 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	41,930	42,420
FICO score of 600 to 639 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	56,266	61,250
FICO score of 600 to 639 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	34,643	35,009
FICO score of 600 to 639 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	32,438	34,331
FICO score of 600 to 639 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	7,613	9,236
FICO score of 600 to 639 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,229	2,696
FICO score of 600 to 639 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	6,283	6,259
FICO score of 600 to 639 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	6,090	9,102
FICO Score of 640 to 679 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	602,146	597,986
FICO Score of 640 to 679 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	435,639	464,618
FICO Score of 640 to 679 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	34	37
FICO Score of 640 to 679 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	4,793	6,745
FICO Score of 640 to 679 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	319,185	320,248
FICO Score of 640 to 679 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	279,728	297,003
FICO Score of 640 to 679 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	97,132	94,601
FICO Score of 640 to 679 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	123,431	127,347
FICO Score of 640 to 679 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	89,991	90,708
FICO Score of 640 to 679 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	90,856	86,740
FICO Score of 640 to 679 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	17,573	19,465
FICO Score of 640 to 679 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	2,446	3,011
FICO Score of 640 to 679 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	2,502	2,641
FICO Score of 640 to 679 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	10,114	14,058
FICO Score of 680 to 719 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,148,564	1,089,764
FICO Score of 680 to 719 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	796,471	812,329
FICO Score of 680 to 719 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	95	98
FICO Score of 680 to 719 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	6,921	8,875
FICO Score of 680 to 719 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	579,125	554,058
FICO Score of 680 to 719 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	506,113	500,234
FICO Score of 680 to 719 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	254,807	236,602
FICO Score of 680 to 719 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	245,154	258,284
FICO Score of 680 to 719 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	138,197	136,980
FICO Score of 680 to 719 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	163,235	147,754
FICO Score of 680 to 719 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	21,419	24,675
FICO Score of 680 to 719 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	3,436	3,955
FICO Score of 680 to 719 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	9,669	10,317
FICO Score of 680 to 719 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	16,864	20,261
FICO Score of 720 to 759 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,974,463	1,809,287
FICO Score of 720 to 759 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	1,098,050	1,115,571
FICO Score of 720 to 759 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	173	92
FICO Score of 720 to 759 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	7,073	8,587
FICO Score of 720 to 759 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,004,260	952,532
FICO Score of 720 to 759 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	719,337	724,831
FICO Score of 720 to 759 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	573,335	480,900
FICO Score of 720 to 759 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	325,201	332,508
FICO Score of 720 to 759 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	188,949	178,876
FICO Score of 720 to 759 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	195,187	183,527
FICO Score of 720 to 759 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	31,454	30,526
FICO Score of 720 to 759 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	4,819	4,760
FICO Score of 720 to 759 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	7,740	8,600
FICO Score of 720 to 759 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	14,985	19,119
FICO Score Equal to or Greater than 760 | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	4,766,417	4,559,287
FICO Score Equal to or Greater than 760 | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	2,741,165	2,812,563
FICO Score Equal to or Greater than 760 | LTV not applicable | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	563	588
FICO Score Equal to or Greater than 760 | LTV not applicable | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	14,169	17,499
FICO Score Equal to or Greater than 760 | LTV less than or equal to 70% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	3,148,412	3,019,514
FICO Score Equal to or Greater than 760 | LTV less than or equal to 70% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	1,881,952	1,917,373
FICO Score Equal to or Greater than 760 | LTV of 70.01% to 80% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	1,106,980	1,066,919
FICO Score Equal to or Greater than 760 | LTV of 70.01% to 90% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	746,823	768,905
FICO Score Equal to or Greater than 760 | LTV of 80.01% to 90% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	290,938	263,541
FICO Score Equal to or Greater than 760 | LTV of 90.01% to 100% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	200,107	187,713
FICO Score Equal to or Greater than 760 | LTV of 90.01% to 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	64,040	73,573
FICO Score Equal to or Greater than 760 | LTV of 100.01% to 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	8,371	8,418
FICO Score Equal to or Greater than 760 | LTV greater than 110% | Residential Mortgages
Loans Receivable [Line Items]
Financing receivables	11,046	12,594
FICO Score Equal to or Greater than 760 | LTV greater than 110% | Home Equity Loans and Lines of Credit
Loans Receivable [Line Items]
Financing receivables	$ 34,181	$ 35,213

LOANS AND ALLOWANCE FOR CREDI75

LOANS AND ALLOWANCE FOR CREDIT LOSSES (Troubled Debt Restructuring Activity) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)contract	Mar. 31, 2017USD ($)contract	Dec. 31, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 6,597,359		$ 6,807,172
Number of Contracts | contract	39,790	69,155
Pre-TDR Recorded Investment	$ 639,212	$ 989,321
Post-TDR Recorded Investment	$ 635,314	$ 988,436
TDRs which Subsequently Defaulted
Number of Contracts | contract	14,472	13,296
Recorded Investment	$ 216,145	$ 230,756
Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	1,507	945
Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	30	(1)
Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 2,361	$ (59)
Commercial | CRE
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	27	24
Pre-TDR Recorded Investment	$ 34,507	$ 30,001
Post-TDR Recorded Investment	$ 33,365	$ 30,340
TDRs which Subsequently Defaulted
Number of Contracts | contract	2	35
Recorded Investment	$ 284	$ 7,721
Commercial | CRE | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	11	2
Commercial | CRE | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	30	(1)
Commercial | CRE | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 1,101	$ (340)
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	80	242
Pre-TDR Recorded Investment	$ 3,725	$ 8,034
Post-TDR Recorded Investment	$ 3,590	$ 8,030
TDRs which Subsequently Defaulted
Number of Contracts | contract	52	66
Recorded Investment	$ 1,520	$ 2,887
Commercial | Commercial and industrial | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	4	4
Commercial | Commercial and industrial | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Commercial | Commercial and industrial | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 131	$ 0
Consumer | Residential mortgages
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	61	89
Pre-TDR Recorded Investment	$ 9,927	$ 15,993
Post-TDR Recorded Investment	$ 9,207	$ 15,810
TDRs which Subsequently Defaulted
Number of Contracts | contract	64	29
Recorded Investment	$ 8,868	$ 4,161
Consumer | Residential mortgages | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Residential mortgages | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Residential mortgages | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 720	$ 183
Consumer | Home equity loans and lines of credit
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	94	19
Pre-TDR Recorded Investment	$ 6,104	$ 1,432
Post-TDR Recorded Investment	$ 5,872	$ 1,553
TDRs which Subsequently Defaulted
Number of Contracts | contract	7	2
Recorded Investment	$ 551	$ 173
Consumer | Home equity loans and lines of credit | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Home equity loans and lines of credit | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Home equity loans and lines of credit | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 232	$ (121)
Consumer | Retail installment contracts and auto loans
TDRs which Subsequently Defaulted
Number of Contracts | contract	12,022	12,281
Recorded Investment	$ 201,669	$ 214,002
Consumer | Retail installment contracts and auto loans, originated
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	32,787	50,910
Pre-TDR Recorded Investment	$ 562,736	$ 906,599
Post-TDR Recorded Investment	561,488	905,558
Consumer | Retail installment contracts and auto loans, originated | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	1,175	934
Consumer | Retail installment contracts and auto loans, originated | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Retail installment contracts and auto loans, originated | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 73	$ 107
Consumer | Retail installment contracts and auto loans, purchased
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1,895	55
Pre-TDR Recorded Investment	$ 14,217	$ 289
Post-TDR Recorded Investment	13,899	282
Consumer | Retail installment contracts and auto loans, purchased | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	316	5
Consumer | Retail installment contracts and auto loans, purchased | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Retail installment contracts and auto loans, purchased | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 2	$ 2
Consumer | Personal unsecured loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4,833	17,757
Pre-TDR Recorded Investment	$ 7,860	$ 24,855
Post-TDR Recorded Investment	$ 7,762	$ 24,746
TDRs which Subsequently Defaulted
Number of Contracts | contract	2,324	874
Recorded Investment	$ 3,243	$ 1,707
Consumer | Personal unsecured loans | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Personal unsecured loans | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Personal unsecured loans | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	$ 98	$ 109
Consumer | Other consumer
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	13	59
Pre-TDR Recorded Investment	$ 136	$ 2,118
Post-TDR Recorded Investment	$ 131	$ 2,117
TDRs which Subsequently Defaulted
Number of Contracts | contract	1	9
Recorded Investment	$ 10	$ 105
Consumer | Other consumer | Term Extension
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	1	0
Consumer | Other consumer | Principal Forbearance
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	0	0
Consumer | Other consumer | Other
Financing Receivable, Modifications [Line Items]
Post-TDR Recorded Investment	4	$ 1
Performing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	5,811,401		5,824,304
Non-performing
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings	$ 785,958		$ 982,868

OPERATING LEASE ASSETS, NET (Co

OPERATING LEASE ASSETS, NET (Components of Leased Vehicles, Net) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Less: accumulated depreciation		$ (3,100,000)	$ (3,400,000)
Total operating lease assets, net	[1],[2]	10,770,896	10,474,308
Vehicles
Operating Leased Assets [Line Items]
Operating leases		14,777,384	14,751,568
Origination fees and other costs		36,563	27,246
Manufacturer subvention payments		(1,077,250)	(1,047,113)
Leased vehicles, gross		13,736,697	13,731,701
Less: accumulated depreciation		(3,075,176)	(3,333,125)
Total operating lease assets, net		10,661,521	10,398,576
Commercial Equipment Vehicles and Aircraft
Operating Leased Assets [Line Items]
Operating leases		131,316	93,981
Less: accumulated depreciation		(21,941)	(18,249)
Total operating lease assets, net		$ 109,375	$ 75,732
[1]	Net of accumulated depreciation of $3.1 billion and $3.4 billion at March 31, 2018 and December 31, 2017, respectively.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

OPERATING LEASE ASSETS, NET (Fu

OPERATING LEASE ASSETS, NET (Future Minimum Rental Receivables) (Details) $ in Thousands	Mar. 31, 2018USD ($)
Leases [Abstract]
2,018	$ 1,393,256
2,019	1,326,920
2,020	647,034
2,021	59,511
2,022	6,754
Thereafter	16,370
Total	$ 3,449,845

OPERATING LEASE ASSETS, NET (Na

OPERATING LEASE ASSETS, NET (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Leases [Abstract]
Lease income	$ 540,896	$ 496,045
Lease expense	424,266	358,792
Operating Leased Assets [Line Items]
Net gain on sale of operating leases	53,200
Operating lease assets returned to the Company at end of lease term
Operating Leased Assets [Line Items]
Net gain on sale of operating leases	$ 53,200	$ 22,700

VIEs (Assets and Liabilities of

VIEs (Assets and Liabilities of VIEs) (Details) - USD ($) $ in Thousands		Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017		Mar. 31, 2017	Dec. 31, 2016
Assets
Restricted cash		$ 3,810,962	[1]		$ 3,818,807	[1]	$ 3,300,000	$ 3,000,000
Loans	[2]	1,960,695			2,522,486
Operating lease assets, net	[1],[3]	10,770,896			10,474,308
Various other assets		3,994,748	[1],[4]	$ 3,628,835	3,632,427	[1],[4]
TOTAL ASSETS		129,227,891		128,295,952	128,294,030		$ 136,091,169
Liabilities
Various other liabilities		996,685	[1]	798,025	799,403	[1]
TOTAL LIABILITIES		105,384,810		$ 104,587,021	104,588,399
VIEs, Primary Beneficiary
Assets
Restricted cash		2,380,619			1,995,557
Loans		22,121,392			22,712,864
Operating lease assets, net		10,612,824			10,160,327
Various other assets		810,497			733,123
TOTAL ASSETS		35,925,332			35,601,871
Liabilities
Notes payable		28,634,362			28,469,999
Various other liabilities		193,133			197,969
TOTAL LIABILITIES		28,827,495			28,667,968
VIEs, Primary Beneficiary | RICs held for sale
Assets
RICs held for sale		$ 453,000			$ 1,100,000
[1]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.
[2]	Includes $162.5 million and $197.7 million of loans recorded at the fair value option ("FVO") at March 31, 2018 and December 31, 2017, respectively.
[3]	Net of accumulated depreciation of $3.1 billion and $3.4 billion at March 31, 2018 and December 31, 2017, respectively.
[4]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.

VIEs (Narrative) (Details)

VIEs (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Sales of receivables securitization	$ 1,500,000,000	$ 700,000,000
Gain (loss) on retail installment contracts	(16,900,000)	$ (2,700,000)
VIE, maximum exposure to loss	0
Trusts | VIE, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Gross retail installment contracts transferred to consolidated Trusts	25,400,000,000		$ 26,100,000,000
Off-balance Securitization Trusts
Variable Interest Entity [Line Items]
Proceeds from securitization of retail installment contracts	$ 4,400,000,000		$ 3,400,000,000

VIEs (Cash Flow Summary) (Detai

VIEs (Cash Flow Summary) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
VIE, Primary Beneficiary | Trusts
Variable Interest Entity [Line Items]
Assets securitized	$ 7,240,944	$ 7,646,625
Net proceeds from new securitizations	3,476,322	5,576,801
Net proceeds from sale of retained bonds	211,610	115,970
Cash received for servicing fees	215,790	208,923
Net distributions from Trusts	545,152	678,229
Total cash received from Trusts	4,448,874	6,579,923
VIE, Not Primary Beneficiary | Off-balance Securitization Trusts
Variable Interest Entity [Line Items]
Assets securitized	1,475,253	700,022
Net proceeds from new securitizations	1,474,820	702,319
Cash received for servicing fees	8,078	1,398
Total cash received from Trusts	$ 1,482,898	$ 703,717

VIEs (Off-balance Sheet Portfol

VIEs (Off-balance Sheet Portfolio) (Details) - VIE, Not Primary Beneficiary - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Variable Interest Entity [Line Items]
Total serviced for other portfolio	$ 4,358,695	$ 3,428,248
Chrysler Capital securitizations
Variable Interest Entity [Line Items]
Total serviced for other portfolio	1,182,457	1,404,232
Third parties
Variable Interest Entity [Line Items]
Total serviced for other portfolio	1,182,457	1,404,232
SC
Variable Interest Entity [Line Items]
Total serviced for other portfolio	$ 3,176,238	$ 2,024,016

GOODWILL AND OTHER INTANGIBLE83

GOODWILL AND OTHER INTANGIBLES (Goodwill) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill	$ 4,444,389	$ 4,444,389
Consumer and Business Banking
Goodwill [Line Items]
Goodwill	1,880,304
Commercial Banking
Goodwill [Line Items]
Goodwill	1,412,995
GCB
Goodwill [Line Items]
Goodwill	131,130
SC
Goodwill [Line Items]
Goodwill	$ 1,019,960

GOODWILL AND OTHER INTANGIBLE84

GOODWILL AND OTHER INTANGIBLES (Goodwill) (Narrative) (Details) - USD ($)	Oct. 01, 2017	Mar. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill		$ 4,444,389,000	$ 4,444,389,000
Impairment of goodwill	$ 0
Commercial Banking
Goodwill [Line Items]
Goodwill		542,600,000
CRE
Goodwill [Line Items]
Goodwill		870,400,000
Santander BanCorp
Goodwill [Line Items]
Impairment of goodwill		$ 10,500,000

GOODWILL AND OTHER INTANGIBLE85

GOODWILL AND OTHER INTANGIBLES (Finite-lived Intangibles) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	$ 520,468	$ 535,753
Accumulated Amortization	(285,604)	(270,460)
Dealer networks
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	416,607	426,411
Accumulated Amortization	(163,393)	(153,589)
Chrysler relationship
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	76,250	80,000
Accumulated Amortization	(62,500)	(58,750)
Trade name
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	15,600	15,900
Accumulated Amortization	(2,400)	(2,100)
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Net Carrying Amount	12,011	13,442
Accumulated Amortization	$ (57,311)	$ (56,021)

GOODWILL AND OTHER INTANGIBLE86

GOODWILL AND OTHER INTANGIBLES (Other Intangible Assets) (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangibles not subject to amortization	$ 0		$ 0
Amortization of intangibles	$ 15,288,000	$ 15,491,000

GOODWILL AND OTHER INTANGIBLE87

GOODWILL AND OTHER INTANGIBLES (Future Amortization Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Remaining Amount To Record
2018, Calendar Year Amount	$ 60,644
2018, Recorded To Date	15,288	$ 15,491
2018, Remaining Amount To Record	45,356
2,019	58,975
2,020	58,642
2,021	39,889
2,022	39,889
Thereafter	$ 277,717

OTHER ASSETS (Other Assets Sche

OTHER ASSETS (Other Assets Schedule) (Details) - USD ($) $ in Thousands	Mar. 31, 2018		Jan. 01, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Income tax receivables	$ 293,072			$ 292,220
Derivative assets at fair value	581,076			448,977
Other repossessed assets	172,683			212,882
MSRs	163,148			149,197
Prepaid expenses	178,920			172,547
OREO	126,714			130,777
Deferred tax asset, net	799,423			771,652
Accrued interest receivable	496,144			563,607
Equity method investments	198,923			194,434
Miscellaneous assets and receivables	984,645			696,134
Total other assets	$ 3,994,748	[1],[2]	$ 3,628,835	$ 3,632,427	[1],[2]
[1]	Includes mortgage servicing rights ("MSRs") of $160.1 million and $146.0 million at March 31, 2018 and December 31, 2017, respectively, for which the Company has elected the FVO. See Note 8 to these Condensed Consolidated Financial Statements for additional information.
[2]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

OTHER ASSETS (MSRs) (Details)

OTHER ASSETS (MSRs) (Details) - Residential MSRs - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Servicing Assets at Fair Value [Line Items]
Principal balance of loans serviced for others	$ 14,800,000		$ 14,900,000
MSRs (11)	160,130	$ 149,455	$ 145,993	$ 146,589
Net changes in the fair value of MSRs	$ 15,000	$ 1,500

OTHER ASSETS (Servicing Assets

OTHER ASSETS (Servicing Assets Rollforward) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Servicing Asset at Amortized Value, Balance [Roll Forward]
MSRs	$ 163,148		$ 149,197
Residential MSRs
Servicing Asset at Amortized Value, Balance [Roll Forward]
Fair value at beginning of period	145,993	$ 146,589
Mortgage servicing assets recognized	2,755	5,730
Principal reductions	(3,661)	(4,321)
Change in fair value due to valuation assumptions	15,043	1,457
Fair value at end of period	160,130	$ 149,455
MSRs	$ 163,100		$ 149,200

OTHER ASSETS (Fee Income and Ga

OTHER ASSETS (Fee Income and Gain on Sale of Mortgage Loans) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Mortgage servicing fee income	$ 10.2	$ 10.6
Gains (losses) on sale of mortgage loans	$ 6.2	$ 4.4

OTHER ASSETS (Deferred Tax Asse

OTHER ASSETS (Deferred Tax Assets, Net) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Deferred tax asset, net	$ 799,423	$ 771,652

DEPOSITS AND OTHER CUSTOMER A93

DEPOSITS AND OTHER CUSTOMER ACCOUNTS (Summary of Deposits and Other Customer Accounts) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Balance
Interest-bearing demand deposits	$ 8,246,120	$ 8,784,597
Non-interest-bearing demand deposits	15,603,797	15,402,235
Savings	6,123,217	5,903,897
Customer repurchase accounts	577,161	802,119
Money market	25,726,743	24,530,661
CDs	5,564,137	5,407,594
Total Deposits	61,841,175	60,831,103
Foreign deposits	$ 9,000,000	$ 9,100,000
Percent of total deposits
Interest-bearing demand deposits (as a percent)	13.30%	14.40%
Non-interest-bearing demand deposits (as a percent)	25.20%	25.30%
Savings (as a percent)	9.90%	9.70%
Customer repurchase accounts (as a percent)	1.00%	1.40%
Money market (as a percent)	41.60%	40.30%
CDs (as a percent)	9.00%	8.90%
Total Deposits (as a percent)	100.00%	100.00%

DEPOSITS AND OTHER CUSTOMER A94

DEPOSITS AND OTHER CUSTOMER ACCOUNTS (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	$ 6,100	$ 5,900
Demand deposit overdrafts that have been reclassified as loan balances	155.7	38.9
CD in denominations greater than $250,000	1,400	1,300
Public fund deposits
Financial Instruments Owned and Pledged as Collateral [Line Items]
Securities pledged as collateral, fair value	$ 2,100	$ 2,300

BORROWINGS (Narrative) (Details

BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Debt Disclosure [Abstract]
Total borrowings and other debt obligations	[1]	$ 38,350,245	$ 39,003,313
[1]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

BORROWINGS (Bank) (Narrative) (

BORROWINGS (Bank) (Narrative) (Details)	Mar. 31, 2018USD ($)
Bank
Debt Instrument [Line Items]
Debt repurchased	$ 0

BORROWINGS (SHUSA) (Narrative)

BORROWINGS (SHUSA) (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Loss on debt extinguishment	$ 2,212	$ 6,749
FHLB advances
Debt Instrument [Line Items]
Loss on debt extinguishment		$ 6,700
Senior Notes | 3.45% senior notes, due August 2018
Debt Instrument [Line Items]
Debt repurchased	$ 63,200
Stated interest rate	3.45%
Senior Notes | 2.70% senior notes, due May 2019
Debt Instrument [Line Items]
Debt repurchased	$ 336,800
Stated interest rate	2.70%

BORROWINGS (Parent Company and

BORROWINGS (Parent Company and Other IHC Entities) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total borrowings and other debt obligations	[1]	$ 38,350,245	$ 39,003,313
Subsidiaries | 2.00% subordinated debt, maturing through 2042
Debt Instrument [Line Items]
Subordinated debt, Balance		$ 40,934	$ 40,842
Effective Rate		2.00%	2.00%
Stated interest rate		2.00%
Subsidiaries | Short-term borrowings, due within one year, due April 2018
Debt Instrument [Line Items]
Short-term borrowings, Balance		$ 93,806	$ 24,000
Effective Rate		1.70%	1.38%
Subsidiaries | Total due to others overnight, due within one year, due April 2018
Debt Instrument [Line Items]
Short-term borrowings, Balance		$ 18,600	$ 10,000
Effective Rate		1.70%	1.38%
Subsidiaries | Short-term borrowings, due within one year, due April 2018
Debt Instrument [Line Items]
Short-term borrowings, Balance		$ 20,421	$ 37,546
Effective Rate		0.25%	0.25%
Subsidiaries | Short-term borrowings, due within one year, maturing through 2018
Debt Instrument [Line Items]
Short-term borrowings, Balance		$ 0	$ 7,123
Effective Rate		0.00%	0.83%
Parent Company and Other Subsidiaries
Debt Instrument [Line Items]
Total borrowings and other debt obligations		$ 7,929,571	$ 8,269,076
Effective Rate		3.52%	3.45%
Senior Notes | 3.45% senior notes, due August 2018
Debt Instrument [Line Items]
Senior notes, Balance		$ 181,227	$ 244,317
Effective Rate		3.62%	3.62%
Stated interest rate		3.45%
Senior Notes | 2.70% senior notes, due May 2019
Debt Instrument [Line Items]
Senior notes, Balance		$ 662,337	$ 998,349
Effective Rate		2.82%	2.82%
Stated interest rate		2.70%
Senior Notes | 2.65% senior notes, due April 2020
Debt Instrument [Line Items]
Senior notes, Balance		$ 996,636	$ 996,238
Effective Rate		2.82%	2.82%
Stated interest rate		2.65%
Senior Notes | 3.70% senior notes, due March 2022
Debt Instrument [Line Items]
Senior notes, Balance		$ 1,445,928	$ 1,440,044
Effective Rate		3.74%	3.74%
Stated interest rate		3.70%
Senior Notes | 3.40% senior notes, due January 2023
Debt Instrument [Line Items]
Senior notes, Balance		$ 993,950	$ 993,662
Effective Rate		3.54%	3.54%
Stated interest rate		3.40%
Senior Notes | 4.50% senior notes, due July 2025
Debt Instrument [Line Items]
Senior notes, Balance		$ 1,095,576	$ 1,095,449
Effective Rate		4.56%	4.56%
Stated interest rate		4.50%
Senior Notes | 4.40% senior notes, due July 2027
Debt Instrument [Line Items]
Senior notes, Balance		$ 1,049,790	$ 1,049,787
Effective Rate		4.40%	4.40%
Stated interest rate		4.40%
Senior Notes | Junior subordinated debentures - Sovereign Capital Trust IX, due July 2036
Debt Instrument [Line Items]
Subordinated debt, Balance		$ 149,469	$ 149,462
Effective Rate		3.38%	3.14%
Senior Notes | Common securities - Sovereign Capital Trust IX
Debt Instrument [Line Items]
Common securities, Balance		$ 4,640	$ 4,640
Effective Rate		3.38%	3.14%
Senior Notes | Senior notes, due July 2019
Debt Instrument [Line Items]
Senior notes, Balance		$ 388,592	$ 388,565
Effective Rate		2.69%	2.31%
Senior Notes | Senior notes, due July 2019 | 3-month LIBOR
Debt Instrument [Line Items]
Basis spread on LIBOR (as a percent)		1.00%
Senior Notes | Senior notes, due September 2019
Debt Instrument [Line Items]
Senior notes, Balance		$ 370,783	$ 370,754
Effective Rate		2.70%	2.34%
Senior Notes | Senior notes, due January 2020
Debt Instrument [Line Items]
Senior notes, Balance		$ 302,512	$ 302,494
Effective Rate		2.71%	2.40%
Senior Notes | Senior notes, due September 2020
Debt Instrument [Line Items]
Senior notes, Balance		$ 114,370	$ 115,804
Effective Rate		3.16%	3.32%
Senior Notes | Senior notes, due September 2020 | 3-month LIBOR
Debt Instrument [Line Items]
Basis spread on LIBOR (as a percent)		1.05%
[1]	The Company has interests in certain securitization trusts ("Trusts") that are considered variable interest entities ("VIEs") for accounting purposes. At March 31, 2018 and December 31, 2017, LHFI included $22.1 billion and $22.7 billion, Operating leases assets, net included $10.6 billion and $10.2 billion, restricted cash included $2.4 billion and $2.0 billion, other assets included $810.5 million and $733.1 million, Borrowings and other debt obligations included $28.6 billion and $28.5 billion, and Other Liabilities included $0.2 billion and $0.2 billion of assets or liabilities that were included within VIEs, respectively. See Note 6 to these Condensed Consolidated Financial Statements for additional information.

BORROWINGS (Santander Bank) (De

BORROWINGS (Santander Bank) (Details) - SBNA - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Total borrowings and other debt obligations	$ 2,119,361	$ 2,575,980
Effective Rate	3.70%	3.07%
8.750% subordinated debentures, due May 2018
Debt Instrument [Line Items]
Subordinated debt, Balance	$ 192,098	$ 192,019
Effective Rate	8.92%	8.92%
Stated interest rate	8.75%
Subordinated term loan, due February 2019
Debt Instrument [Line Items]
Subordinated term loan, Balance	$ 104,740	$ 111,883
Effective Rate	7.63%	7.12%
FHLB advances, maturing through July 2019
Debt Instrument [Line Items]
FHLB advances, Balance	$ 1,500,000	$ 1,950,000
Effective Rate	1.91%	1.53%
Securities sold under repurchase agreements
Debt Instrument [Line Items]
Securities sold under repurchase agreements, Balance	$ 150,000	$ 150,000
Effective Rate	1.90%	1.56%
Real estate investment trust preferred, due May 2020
Debt Instrument [Line Items]
REIT preferred	$ 144,522	$ 144,167
Effective Rate	13.24%	13.35%
Subordinated term loan, due August 2022
Debt Instrument [Line Items]
Subordinated term loan, Balance	$ 28,001	$ 27,911
Effective Rate	9.29%	8.89%
FHLB advances
Debt Instrument [Line Items]
Letters of credit	$ 485,800

BORROWINGS (SC) (Details)

BORROWINGS (SC) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Initial Note Amounts Issued	$ 86,400,000	$ 90,900,000
SC
Debt Instrument [Line Items]
Initial Note Amounts Issued	50,617,240,000	49,078,924,000
Restricted Cash Pledged	2,203,224,000	1,847,759,000
Private issuances of notes backed by vehicle leases	$ 4,600,000,000	$ 3,700,000,000
SC | Maximum
Debt Instrument [Line Items]
Effective Rate	2.86%	4.09%
SC | Revolving Credit Facility
Debt Instrument [Line Items]
Initial Note Amounts Issued	$ 5,438,558,000	$ 5,598,316,000
Committed Amount	$ 12,409,626,000	$ 12,444,483,000
Effective Rate	3.30%	2.73%
Assets Pledged	$ 7,678,198,000	$ 6,703,767,000
Restricted Cash Pledged	$ 190,357,000	$ 132,024,000
SC | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Facility rolling maturity period	1 year	1 year
SC | Revolving Credit Facility | Warehouse line, maturing on various dates
Debt Instrument [Line Items]
Initial Note Amounts Issued	$ 603,145,000	$ 339,145,000
Committed Amount	$ 1,250,000,000	$ 1,250,000,000
Effective Rate	2.71%	2.53%
Assets Pledged	$ 865,991,000	$ 461,353,000
Restricted Cash Pledged	24,063,000	12,645,000
SC | Revolving Credit Facility | Warehouse line, due November 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	358,220,000	435,220,000
Committed Amount	$ 500,000,000	$ 500,000,000
Effective Rate	2.06%	1.92%
Assets Pledged	$ 421,622,000	$ 521,365,000
Restricted Cash Pledged	21,337,000	16,866,000
SC | Revolving Credit Facility | Warehouse line, due August 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	2,105,842,000	2,044,843,000
Committed Amount	$ 3,900,000,000	$ 3,900,000,000
Effective Rate	3.42%	2.96%
Assets Pledged	$ 3,108,422,000	$ 2,929,890,000
Restricted Cash Pledged	68,631,000	53,639,000
SC | Revolving Credit Facility | Warehouse line, due October 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	611,477,000	226,577,000
Committed Amount	$ 1,800,000,000	$ 1,800,000,000
Effective Rate	3.43%	4.95%
Assets Pledged	$ 839,499,000	$ 311,336,000
Restricted Cash Pledged	14,727,000	6,772,000
SC | Revolving Credit Facility | Warehouse line, due October 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	148,565,000	81,865,000
Committed Amount	$ 400,000,000	$ 400,000,000
Effective Rate	3.65%	4.09%
Assets Pledged	$ 206,287,000	$ 114,021,000
Restricted Cash Pledged	4,070,000	3,057,000
SC | Revolving Credit Facility | Warehouse line, due August 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	229,984,000
Committed Amount	$ 500,000,000
Effective Rate	3.74%
Assets Pledged	$ 348,645,000
Restricted Cash Pledged	19,915,000
SC | Revolving Credit Facility | Warehouse line, due November 2019
Debt Instrument [Line Items]
Initial Note Amounts Issued	297,699,000	403,999,000
Committed Amount	$ 1,000,000,000	$ 1,000,000,000
Effective Rate	3.63%	2.66%
Assets Pledged	$ 420,623,000	$ 546,782,000
Restricted Cash Pledged	11,557,000	14,729,000
SC | Revolving Credit Facility | Warehouse line, due October 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	229,800,000	235,700,000
Committed Amount	$ 300,000,000	$ 300,000,000
Effective Rate	3.37%	2.84%
Assets Pledged	$ 268,054,000	$ 289,634,000
Restricted Cash Pledged	10,719,000	10,474,000
SC | Revolving Credit Facility | Warehouse line, due December 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	0	0
Committed Amount	$ 300,000,000	$ 300,000,000
Effective Rate	0.00%	1.49%
Assets Pledged	$ 0	$ 0
Restricted Cash Pledged	0	0
SC | Revolving Credit Facility | Warehouse line, due January 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued		336,484,000
Committed Amount		$ 500,000,000
Effective Rate		2.87%
Assets Pledged		$ 473,208,000
Restricted Cash Pledged		0
SC | Revolving Credit Facility | Repurchase facility, maturing on various dates
Debt Instrument [Line Items]
Initial Note Amounts Issued	291,949,000	325,775,000
Committed Amount	$ 291,949,000	$ 325,775,000
Effective Rate	3.49%	3.24%
Assets Pledged	$ 407,299,000	$ 474,188,000
Restricted Cash Pledged	12,962,000	13,842,000
SC | Revolving Credit Facility | Repurchase facility, due April 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	196,727,000	202,311,000
Committed Amount	$ 196,727,000	$ 202,311,000
Effective Rate	3.06%	2.67%
Assets Pledged	$ 257,054,000	$ 264,120,000
Restricted Cash Pledged	0	0
SC | Revolving Credit Facility | Repurchase facility, due June 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	153,177,000
Committed Amount	$ 153,177,000
Effective Rate	3.80%
Assets Pledged	$ 222,108,000
Restricted Cash Pledged	0
SC | Revolving Credit Facility | Repurchase facility, due December 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	67,773,000
Committed Amount	$ 67,773,000
Effective Rate	3.55%
Assets Pledged	$ 156,202,000
Restricted Cash Pledged	0
SC | Revolving Credit Facility | Repurchase facility, due March 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued		147,500,000
Committed Amount		$ 147,500,000
Effective Rate		3.91%
Assets Pledged		$ 222,108,000
Restricted Cash Pledged		0
SC | Revolving Credit Facility | Repurchase facility, due March 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued		68,897,000
Committed Amount		$ 68,897,000
Effective Rate		3.04%
Assets Pledged		$ 95,762,000
Restricted Cash Pledged		0
SC | Revolving Credit Facility | Line of credit with related party, due December 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	30,000,000	0
Committed Amount	$ 1,000,000,000	$ 1,000,000,000
Effective Rate	3.09%	3.09%
Assets Pledged	$ 30,000,000	$ 0
Restricted Cash Pledged	0	0
SC | Revolving Credit Facility | Line of credit with related party, due December 2018
Debt Instrument [Line Items]
Initial Note Amounts Issued	114,200,000	750,000,000
Committed Amount	$ 750,000,000	$ 750,000,000
Effective Rate	4.34%	1.33%
Assets Pledged	$ 126,392,000	$ 0
Restricted Cash Pledged	2,376,000	0
SC | Revolving Credit Facility | Line of credit with related party
Debt Instrument [Line Items]
Unsecured debt	$ 0	$ 0

BORROWINGS (Secured Structured

BORROWINGS (Secured Structured Financings) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Initial Note Amounts Issued	$ 86,400	$ 90,900
SC
Debt Instrument [Line Items]
Balance	22,862,755	22,559,941
Initial Note Amounts Issued	50,617,240	49,078,924
Collateral	29,433,122	29,106,279
Restricted Cash	$ 2,203,224	$ 1,847,759
SC | Minimum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	0.88%	0.88%
SC | Maximum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	2.86%	4.09%
SC | SC public securitizations, maturing on various dates
Debt Instrument [Line Items]
Balance	$ 15,943,321	$ 14,995,304
Initial Note Amounts Issued	37,984,872	36,800,642
Collateral	20,910,432	19,873,621
Restricted Cash	$ 1,629,738	$ 1,470,459
SC | SC public securitizations, maturing on various dates | Minimum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	1.16%	0.89%
SC | SC public securitizations, maturing on various dates | Maximum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	2.80%	2.80%
SC | SC privately issued amortizing notes, maturing on various dates
Debt Instrument [Line Items]
Balance	$ 6,919,434	$ 7,564,637
Initial Note Amounts Issued	12,632,368	12,278,282
Collateral	8,522,690	9,232,658
Restricted Cash	$ 573,486	$ 377,300
SC | SC privately issued amortizing notes, maturing on various dates | Minimum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	0.88%	0.88%
SC | SC privately issued amortizing notes, maturing on various dates | Maximum
Debt Instrument [Line Items]
Initial Weighted Average Interest Rate Range	2.86%	4.09%

ACCUMULATED OTHER COMPREHENS102

ACCUMULATED OTHER COMPREHENSIVE INCOME / (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income/(loss), pretax activity	$ (133,888)	$ 31,951
Total other comprehensive income/(loss), tax effect	1,132	(12,984)
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(132,756)	18,967
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, Beginning balance	23,705,631	22,378,758
Net Activity	(132,756)	18,967
Net Activity, upon adoption	(171,850)
Equity, Ending balance	23,843,081	22,599,750
Net unrealized (losses)/gains on cash flow hedge derivative financial instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss), pretax activity	(11,462)	(2,828)
Other comprehensive income/(loss), tax effect	(4,671)	(1,269)
Other comprehensive income/(loss), net activity	(16,133)	(4,097)
Reclassification adjustment, pretax activity	(1,687)	2,387
Reclassification adjustment, tax effect	455	(777)
Reclassification adjustment, net activity	(1,232)	1,610
Total other comprehensive income/(loss), pretax activity	(13,149)	(441)
Total other comprehensive income/(loss), tax effect	(4,216)	(2,046)
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(17,365)	(2,487)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, Beginning balance	(6,388)	(6,725)
Net Activity	(17,365)	(2,487)
Equity, Ending balance	(23,753)	(9,212)
Net unrealized gains/(losses) on investment securities available-for-sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income/(loss), pretax activity	(122,244)	31,479
Other comprehensive income/(loss), tax effect	10,710	(10,510)
Other comprehensive income/(loss), net activity	(111,534)	20,969
Reclassification adjustment, pretax activity		0
Reclassification adjustment, tax effect		0
Reclassification adjustment, net activity		0
Total other comprehensive income/(loss), pretax activity	(121,581)	31,479
Total other comprehensive income/(loss), tax effect	10,652	(10,510)
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(110,929)	20,969
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, Beginning balance	(140,498)	(130,754)
Net Activity	(110,929)	20,969
Cumulative effect of adoption of new ASUs	(39,094)
Net Activity, upon adoption	(150,023)
Equity, Ending balance	(290,521)	(109,785)
Reclassification adjustment for net (gains)/losses included in net income/(expense) on non-OTTI securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, pretax activity	663	0
Reclassification adjustment, tax effect	(58)	0
Reclassification adjustment, net activity	605	0
Reclassification adjustment for net (gains)/losses included in net income/(expense) on OTTI securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment, pretax activity		0
Reclassification adjustment, tax effect		0
Reclassification adjustment, net activity		0
Pension and post-retirement actuarial gains/(losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total other comprehensive income/(loss), pretax activity	842	913
Total other comprehensive income/(loss), tax effect	(5,304)	(428)
TOTAL OTHER COMPREHENSIVE LOSS, NET OF TAX	(4,462)	485
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, Beginning balance	(51,545)	(55,729)
Net Activity	(4,462)	485
Equity, Ending balance	(56,007)	(55,244)
Accumulated other comprehensive (loss)/income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Equity, Beginning balance	(198,431)	(193,208)
Equity, Ending balance	$ (370,281)	$ (174,241)

DERIVATIVES (Narrative) (Detail

DERIVATIVES (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Credit Risk Contingent Features
Fair value of derivatives with credit risk contingent feature associated with credit ratings	$ 1,700,000
Additional collateral required	0
Fair value of derivatives with credit risk contingent features	7,300,000		$ 10,400,000
Collateral posted	10,700,000		$ 15,700,000
Cash Flow Hedges
Cash flow hedge gains to be reclassified within next twelve months	34,700,000
Net unrealized (losses)/gains on cash flow hedge derivative financial instruments
Derivative [Line Items]
Loss recognized in Other Comprehensive Income for cash flow hedge derivatives	(16,133,000)	$ (4,097,000)
Amount reclassified from Other Comprehensive Income into earnings for cash flow hedge derivatives	$ (1,232,000)	$ 1,610,000

DERIVATIVES (Derivatives Design

DERIVATIVES (Derivatives Designated in Hedge Relationships) (Details) - Designated as hedging instrument - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Notional Amount	$ 10,331,593	$ 10,183,511
Asset, Total	75,793	49,442
Liability, Total	$ 119,744	$ 84,911
Weighted Average Receive Rate	0.58%	0.58%
Weighted Average Pay Rate	0.74%	0.63%
Weighted Average
Derivative [Line Items]
Weighted Average Life (Years)	2 years 3 months 21 days	2 years 6 months 10 days
Cash flow hedges | Pay fixed — receive variable interest rate swaps
Derivative [Line Items]
Notional Amount	$ 4,931,593	$ 5,183,511
Asset, Cash flow hedges	71,974	46,422
Liability, Cash flow hedges	$ 2,346	$ 4,458
Weighted Average Receive Rate	0.07%	0.05%
Weighted Average Pay Rate	0.15%	0.14%
Cash flow hedges | Pay fixed — receive variable interest rate swaps | Weighted Average
Derivative [Line Items]
Weighted Average Life (Years)	1 year 11 months 1 day	2 years 1 month 13 days
Cash flow hedges | Pay variable - receive fixed interest rate swaps
Derivative [Line Items]
Notional Amount	$ 4,000,000	$ 4,000,000
Asset, Cash flow hedges	0	0
Liability, Cash flow hedges	$ 117,398	$ 80,453
Weighted Average Receive Rate	1.41%	1.41%
Weighted Average Pay Rate	1.73%	1.42%
Cash flow hedges | Pay variable - receive fixed interest rate swaps | Weighted Average
Derivative [Line Items]
Weighted Average Life (Years)	2 years 9 months 10 days	3 years 7 days
Cash flow hedges | Interest rate floor
Derivative [Line Items]
Notional Amount	$ 1,400,000	$ 1,000,000
Asset, Cash flow hedges	3,819	3,020
Liability, Cash flow hedges	$ 0	$ 0
Weighted Average Receive Rate	0.05%	0.00%
Weighted Average Pay Rate	0.00%	0.00%
Cash flow hedges | Interest rate floor | Weighted Average
Derivative [Line Items]
Weighted Average Life (Years)	2 years 4 months 13 days	2 years 7 months 20 days

DERIVATIVES (Derivatives Not De

DERIVATIVES (Derivatives Not Designated in Hedge Relationships) (Details) - Not designated as hedging instrument - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	$ 50,822,874	$ 48,685,902
Asset derivatives Fair value	512,857	413,802
Liability derivatives Fair value	450,915	342,900
Other
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	979,071	824,786
Asset derivatives Fair value	4,103	5,874
Liability derivatives Fair value	5,924	5,228
Foreign exchange contracts
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	3,708,688	2,764,999
Asset derivatives Fair value	20,053	24,932
Liability derivatives Fair value	26,872	25,521
Interest rate swap agreements
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	2,176,064	1,749,349
Asset derivatives Fair value	16,685	9,596
Liability derivatives Fair value	1,520	1,631
Interest rate cap agreements
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	10,851,530	10,932,707
Asset derivatives Fair value	197,801	135,942
Liability derivatives Fair value	0	32,109
Options for interest rate cap agreements
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	10,825,149	10,906,081
Asset derivatives Fair value	0	32,165
Liability derivatives Fair value	197,548	135,824
Mortgage banking derivatives
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	849,224	768,046
Asset derivatives Fair value	3,260	2,301
Liability derivatives Fair value	10,772	2,551
Mortgage banking derivatives | Forward commitments to sell loans
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	318,562	311,852
Asset derivatives Fair value	1	3
Liability derivatives Fair value	972	459
Mortgage banking derivatives | Interest rate lock commitments
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	175,662	126,194
Asset derivatives Fair value	2,253	2,105
Liability derivatives Fair value	0	0
Mortgage banking derivatives | Mortgage servicing
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	355,000	330,000
Asset derivatives Fair value	1,006	193
Liability derivatives Fair value	9,800	2,092
Customer related derivatives
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	21,433,148	20,739,934
Asset derivatives Fair value	270,955	202,992
Liability derivatives Fair value	208,279	140,036
Customer related derivatives | Swaps receive fixed
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	9,525,889	9,328,079
Asset derivatives Fair value	34,637	72,912
Liability derivatives Fair value	157,132	70,348
Customer related derivatives | Swaps pay fixed
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	9,852,498	9,576,893
Asset derivatives Fair value	210,611	110,109
Liability derivatives Fair value	27,306	51,380
Customer related derivatives | Other
Derivative Instruments Not Designated as Hedging Instruments [Abstract]
Notional	2,054,761	1,834,962
Asset derivatives Fair value	25,707	19,971
Liability derivatives Fair value	$ 23,841	$ 18,308

DERIVATIVES (Gains (Losses on A

DERIVATIVES (Gains (Losses on All Derivatives) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Pay fixed-receive variable interest rate swaps | Interest expense on borrowings | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	$ 2,764	$ 2,343
Pay variable receive-fixed interest rate swap | Interest income on loans | Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	(2,020)	(2,781)
Forward commitments to sell loans | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	(514)	(10,940)
Interest rate lock commitments | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	148	1,994
Mortgage servicing | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	(6,895)	497
Customer related derivatives | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	2,586	(1,887)
Foreign exchange | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	1,289	2,260
Interest rate swaps, caps, and options | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	9,717	1,204
Interest rate swaps, caps, and options | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	0	0
Total return settlement | Other administrative expenses
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	0	(505)
Other | Miscellaneous income, net
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized on all derivatives	$ (2,831)	$ (1,501)

DERIVATIVES (Offsetting of Fina

DERIVATIVES (Offsetting of Financial Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement	$ 586,397	$ 461,139
Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets	7,496	6,731
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	578,901	454,408
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Assets	1,978	2,021
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received, Total Derivative Assets	156,683	81,051
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	420,240	371,336
Total derivatives not subject to a master netting arrangement or similar arrangement	2,253	2,105
Gross Amounts of Recognized Assets, Total Derivative Assets	588,650	463,244
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total Derivative Assets	581,154	456,513
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet - Net Amount, Total Derivative Assets	422,493	373,441
Other derivative activities
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement	510,604	411,697
Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets	7,496	6,731
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	503,108	404,966
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Assets	1,978	2,021
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received, Total Derivative Assets	106,006	77,975
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	395,124	324,970
Cash flow hedges
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets, Total derivatives subject to a master netting arrangement or similar arrangement	75,793	49,442
Gross Amounts Offset in the Condensed Consolidated Balance Sheet, Total Derivative Assets	0	0
Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	75,793	49,442
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments, Total Derivative Assets	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Received, Total Derivative Assets	50,677	3,076
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	$ 25,116	$ 46,366

DERIVATIVES (Offsetting of F108

DERIVATIVES (Offsetting of Financial Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement	$ 570,440	$ 427,663
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	13,255	16,236
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	557,185	411,427
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged	331,515	166,338
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	225,670	245,089
Total derivatives not subject to a master netting arrangement or similar arrangement	219	148
Gross Amounts of Recognized Liabilities, Total Derivative Liabilities	570,659	427,811
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total Derivative Liabilities	557,404	411,575
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total Derivatives Liabilities	225,889	245,237
Other derivative activities
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement	450,485	342,752
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	13,255	16,236
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	437,230	326,516
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged	331,304	165,716
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	105,926	160,800
Cash flow hedges
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities, Total derivatives subject to a master netting arrangement or similar arrangement	119,955	84,911
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet, Total derivatives subject to a master netting arrangement or similar arrangement	119,955	84,911
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Financial Instruments	0	0
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Cash Collateral Pledged	211	622
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet, Net Amount, Total derivatives subject to a master netting arrangement or similar arrangement	$ 119,744	$ 84,289

INCOME TAXES (Details)

INCOME TAXES (Details) $ in Thousands	3 Months Ended		12 Months Ended	36 Months Ended	60 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2009USD ($)transaction	Dec. 31, 2005USD ($)	Dec. 31, 2007USD ($)	Dec. 31, 2016USD ($)
Income Tax Disclosure [Abstract]
Income tax provision	$ 95,321	$ 78,937
Effective tax rate	27.00%	32.50%
Income Tax Contingency [Line Items]
Number of financing transactions related to lawsuit | transaction			2
Transaction amount related to lawsuit seeking refund of taxes paid			$ 1,200,000
Disallowed interest expense and transaction costs deductions			74,600
Penalties and interest expense			$ 92,500
Tax reserve						$ 36,800
Reasonably possible decrease in reserve for uncertain tax positions	$ 36,800
Settled Litigation
Income Tax Contingency [Line Items]
Tax reserve						$ 230,100
Foreign
Income Tax Contingency [Line Items]
Foreign taxes paid					$ 264,000
U.K. | Settled Litigation
Income Tax Contingency [Line Items]
Foreign taxes paid				$ 132,000

FAIR VALUE (General) (Details)

FAIR VALUE (General) (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 14,403,463	$ 15,395,769
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	174,440	139,616
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	13,550,408	14,571,332
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 678,615	$ 684,821
Percentage of level 3 assets to total assets held at fair value	4.70%
Percentage of level 3 assets to total assets	0.50%

FAIR VALUE (Fair Value Measurem

FAIR VALUE (Fair Value Measurements, Recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Financial assets:
AFS investment securities	$ 13,321,594	$ 14,413,183
Other investments - trading securities	3,024	1
RICs held-for-investment	167,600	186,500
Other assets - derivatives	581,154	456,513
Total MSRs	163,148	149,197
Financial liabilities:
Other liabilities - derivatives	557,404	411,575
Residential MSRs
Financial assets:
MSRs (11)	160,130	145,993	$ 149,455	$ 146,589
Total MSRs	163,100	149,200
Recurring
Financial assets:
AFS investment securities	13,321,594	14,402,369
Other investments - trading securities	3,024	1
RICs held-for-investment	167,597	186,471
LHFS	162,468	197,691
MSRs (11)	160,130	145,993
Other assets - derivatives	588,650	463,244
Total financial assets	14,403,463	15,395,769
Financial liabilities:
Other liabilities - derivatives	570,659	427,811
Total financial liabilities	570,659	427,811
Recurring | U.S. Treasury securities
Financial assets:
AFS investment securities	1,375,105	998,112
Recurring | Corporate debt
Financial assets:
AFS investment securities	2,723	11,660
Recurring | ABS
Financial assets:
AFS investment securities	487,232	507,162
Recurring | State and municipal securities
Financial assets:
AFS investment securities	21	23
Recurring | MBS
Financial assets:
AFS investment securities	11,456,513	12,885,412
Recurring | Equity securities
Financial assets:
Equity securities excluded in accordance with adoption of ASU 2015-07		10,800
Recurring | Level 1
Financial assets:
AFS investment securities	174,439	139,615
Other investments - trading securities	1	1
RICs held-for-investment	0	0
LHFS	0	0
MSRs (11)	0	0
Other assets - derivatives	0	0
Total financial assets	174,440	139,616
Financial liabilities:
Other liabilities - derivatives	0	0
Total financial liabilities	0	0
Recurring | Level 1 | U.S. Treasury securities
Financial assets:
AFS investment securities	174,439	139,615
Recurring | Level 1 | Corporate debt
Financial assets:
AFS investment securities	0	0
Recurring | Level 1 | ABS
Financial assets:
AFS investment securities	0	0
Recurring | Level 1 | State and municipal securities
Financial assets:
AFS investment securities	0	0
Recurring | Level 1 | MBS
Financial assets:
AFS investment securities	0	0
Recurring | Level 2
Financial assets:
AFS investment securities	12,798,521	13,912,502
Other investments - trading securities	3,023	0
RICs held-for-investment	0	0
LHFS	162,468	197,691
MSRs (11)	0	0
Other assets - derivatives	586,396	461,139
Total financial assets	13,550,408	14,571,332
Financial liabilities:
Other liabilities - derivatives	570,150	427,217
Total financial liabilities	570,150	427,217
Recurring | Level 2 | U.S. Treasury securities
Financial assets:
AFS investment securities	1,200,666	858,497
Recurring | Level 2 | Corporate debt
Financial assets:
AFS investment securities	2,723	11,660
Recurring | Level 2 | ABS
Financial assets:
AFS investment securities	138,598	156,910
Recurring | Level 2 | State and municipal securities
Financial assets:
AFS investment securities	21	23
Recurring | Level 2 | MBS
Financial assets:
AFS investment securities	11,456,513	12,885,412
Recurring | Level 3
Financial assets:
AFS investment securities	348,634	350,252
Other investments - trading securities	0	0
RICs held-for-investment	167,597	186,471
LHFS	0	0
MSRs (11)	160,130	145,993
Other assets - derivatives	2,254	2,105
Total financial assets	678,615	684,821
Financial liabilities:
Other liabilities - derivatives	509	594
Total financial liabilities	509	594
Recurring | Level 3 | U.S. Treasury securities
Financial assets:
AFS investment securities	0	0
Recurring | Level 3 | Corporate debt
Financial assets:
AFS investment securities	0	0
Recurring | Level 3 | ABS
Financial assets:
AFS investment securities	348,634	350,252
Recurring | Level 3 | State and municipal securities
Financial assets:
AFS investment securities	0	0
Recurring | Level 3 | MBS
Financial assets:
AFS investment securities	$ 0	$ 0

FAIR VALUE (Fair Value Measu112

FAIR VALUE (Fair Value Measurements, Non-recurring) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 167,600	$ 186,500
Total carrying value of the loans	6,918,658	7,164,184
Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	106,387	126,592
Vehicle inventory	415,262	325,203
LHFS	1,798,222	2,324,830
MSRs (11)	9,381	9,273
Nonrecurring | Impaired commercial LHFI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	442,576	583,175
Total carrying value of the loans	357,700	491,500
Nonrecurring | Auto loans impaired due to bankruptcy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	128,641	121,578
Nonrecurring | Impaired personal loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
LHFS	967,800	1,100,000
Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	0	0
Vehicle inventory	0	0
LHFS	0	0
MSRs (11)	0	0
Nonrecurring | Level 1 | Impaired commercial LHFI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Nonrecurring | Level 1 | Auto loans impaired due to bankruptcy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	0	0
Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	2,373	20,011
Vehicle inventory	415,262	325,203
LHFS	0	0
MSRs (11)	0	0
Nonrecurring | Level 2 | Impaired commercial LHFI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	132,339	226,832
Nonrecurring | Level 2 | Auto loans impaired due to bankruptcy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	128,641	121,578
Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreclosed assets	104,014	106,581
Vehicle inventory	0	0
LHFS	1,798,222	2,324,830
MSRs (11)	9,381	9,273
Nonrecurring | Level 3 | Impaired commercial LHFI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	310,237	356,343
Nonrecurring | Level 3 | Auto loans impaired due to bankruptcy
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans	$ 0	$ 0

FAIR VALUE (Fair Value Adjustme

FAIR VALUE (Fair Value Adjustments) (Details) - Nonrecurring - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Impaired LHFI | Provision for credit losses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	$ (29,312)	$ (45,772)
Foreclosed assets | Miscellaneous income, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	(2,473)	(1,742)
LHFS | Provision for credit losses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	(381)	0
LHFS | Miscellaneous income, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	(70,490)	(66,121)
Auto loans impaired due to bankruptcy | Provision for credit losses
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	(82,145)	(23,600)
MSRs | Miscellaneous income, net
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value adjustment	$ (549)	$ 95

FAIR VALUE (Reconciliation of A

FAIR VALUE (Reconciliation of Assets and Liabilities Using Level 3 Inputs) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)factor	Mar. 31, 2017USD ($)	Jan. 28, 2014USD ($)
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Number of primary factors driving gains | factor	3
RICs HFI
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Unpaid principal balance on previously charged-off RIC portfolio			$ 3,000,000
Level 3 | Recurring
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Balances, beginning of period	$ 684,230	$ 1,149,326
Losses in other comprehensive income	(499)	(619)
Gains/(losses) in earnings	20,453	19,542
Additions/Issuances	4,104	19,061
Settlements	(30,182)	(289,637)
Balances, end of period	678,106	897,673
Changes in unrealized gains (losses) included in earnings related to balances still held at end of period	20,305	17,548
Level 3 | Recurring | Investments AFS
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Balances, beginning of period	350,252	814,567
Losses in other comprehensive income	(499)	(619)
Gains/(losses) in earnings	0	0
Additions/Issuances	0	0
Settlements	(1,119)	(240,494)
Balances, end of period	348,634	573,454
Changes in unrealized gains (losses) included in earnings related to balances still held at end of period	0	0
Level 3 | Recurring | RICs HFI
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Balances, beginning of period	186,471	217,170
Losses in other comprehensive income	0	0
Gains/(losses) in earnings	5,276	16,891
Additions/Issuances	1,349	13,331
Settlements	(25,499)	(44,919)
Balances, end of period	167,597	202,473
Changes in unrealized gains (losses) included in earnings related to balances still held at end of period	5,276	16,891
Level 3 | Recurring | MSRs (11)
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Balances, beginning of period	145,993	146,589
Losses in other comprehensive income	0	0
Gains/(losses) in earnings	15,043	1,457
Additions/Issuances	2,755	5,730
Settlements	(3,661)	(4,321)
Balances, end of period	160,130	149,455
Changes in unrealized gains (losses) included in earnings related to balances still held at end of period	15,043	1,457
Level 3 | Recurring | Derivatives
Fair Value, Assets, Unobservable Input Reconciliation [Roll Forward]
Balances, beginning of period	1,514	(29,000)
Losses in other comprehensive income	0	0
Gains/(losses) in earnings	134	1,194
Additions/Issuances	0	0
Settlements	97	97
Balances, end of period	1,745	(27,709)
Changes in unrealized gains (losses) included in earnings related to balances still held at end of period	$ (14)	$ (800)

FAIR VALUE (Sensitivity Analysi

FAIR VALUE (Sensitivity Analysis of Fair Value, Mortgage Servicing Rights) (Details) - MSRs $ in Millions	Mar. 31, 2018USD ($)
Sensitivity Analysis of Fair Value of Interests Continued to be Held by Transferor, Servicing Assets or Liabilities, Impact of Adverse Change in Assumption [Line Items]
Sensitivity analysis of fair value, impact of 10 percent adverse change in prepayment speed	$ (4.9)
Sensitivity analysis of fair value, impact of 20 percent adverse change in prepayment speed	(9.5)
Sensitivity analysis of fair value, impact of 10 percent adverse change in discount rate	(6)
Sensitivity analysis of fair value, impact of 20 percent adverse change in discount rate	$ (11.7)

FAIR VALUE (Quantitative Inform

FAIR VALUE (Quantitative Information) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Financial Assets:
Available-for-sale (AFS) at fair value	$ 13,321,594	$ 14,413,183
RICs held-for-investment	167,600	186,500
Derivatives	581,154	456,513
Level 3 | Mortgage banking interest rate lock commitments | DCF
Financial Assets:
Derivatives	$ 2,253	$ 2,105
Unobservable Inputs
Pull through percentage	78.00%	76.98%
Level 3 | Mortgage banking interest rate lock commitments | DCF | Minimum
Unobservable Inputs
MSR value	0.73%	0.73%
Level 3 | Mortgage banking interest rate lock commitments | DCF | Maximum
Unobservable Inputs
MSR value	1.03%	1.03%
Level 3 | Mortgage banking interest rate lock commitments | DCF | Weighted Average
Unobservable Inputs
MSR value	1.03%	0.95%
Level 3 | Financing bonds | DCF
Financial Assets:
Available-for-sale (AFS) at fair value	$ 304,851	$ 304,727
Level 3 | Financing bonds | DCF | Minimum
Unobservable Inputs
Discount Rate	2.80%	2.16%
Level 3 | Financing bonds | DCF | Maximum
Unobservable Inputs
Discount Rate	3.02%	2.90%
Level 3 | Financing bonds | DCF | Weighted Average
Unobservable Inputs
Discount Rate	2.84%	2.28%
Level 3 | Sale-leaseback securities | Consensus Pricing
Financial Assets:
Available-for-sale (AFS) at fair value	$ 43,783	$ 45,525
Unobservable Inputs
Offered quotes (as a percent)	117.11%	120.19%
Level 3 | RICs HFI | DCF
Financial Assets:
RICs held-for-investment	$ 167,597	$ 186,471
Unobservable Inputs
Prepayment rate (CPR)	6.66%	6.66%
Level 3 | RICs HFI | DCF | Minimum
Unobservable Inputs
Discount Rate	9.50%	9.50%
Recovery Rate	25.00%	25.00%
Level 3 | RICs HFI | DCF | Maximum
Unobservable Inputs
Discount Rate	14.50%	14.50%
Recovery Rate	43.00%	43.00%
Level 3 | RICs HFI | DCF | Weighted Average
Unobservable Inputs
Discount Rate	12.41%	12.37%
Recovery Rate	41.59%	41.51%
Level 3 | Personal LHFS | Lower of Market or Income Approach
Financial Assets:
Loans held for sale	$ 967,789	$ 1,062,090
Level 3 | Personal LHFS | Lower of Market or Income Approach | Minimum
Unobservable Inputs
Discount Rate	15.00%	15.00%
Market Participant View (as a percent)	70.00%	70.00%
Default Rate	30.00%	30.00%
Net Principal Payment Rate	50.00%	50.00%
Loss Severity Rate	90.00%	90.00%
Level 3 | Personal LHFS | Lower of Market or Income Approach | Maximum
Unobservable Inputs
Discount Rate	20.00%	20.00%
Market Participant View (as a percent)	80.00%	80.00%
Default Rate	40.00%	40.00%
Net Principal Payment Rate	70.00%	70.00%
Loss Severity Rate	95.00%	95.00%
Level 3 | RICs HFS | DCF
Financial Assets:
Loans held for sale		$ 1,101,049
Level 3 | RICs HFS | DCF | Minimum
Unobservable Inputs
Discount Rate		3.00%
Prepayment rate (CPR)		15.00%
Default Rate		3.00%
Loss Severity Rate		50.00%
Level 3 | RICs HFS | DCF | Maximum
Unobservable Inputs
Discount Rate		6.00%
Prepayment rate (CPR)		20.00%
Default Rate		4.00%
Loss Severity Rate		60.00%
Level 3 | RICs HFS | Income Approach
Financial Assets:
Loans held for sale	$ 620,168
Level 3 | RICs HFS | Income Approach | Minimum
Unobservable Inputs
Expected Yield (as a percent)	1.00%
Expected Life Time Cumulative Loss (as a percent)	4.00%
Weighted Average Life	2 years
Level 3 | RICs HFS | Income Approach | Maximum
Unobservable Inputs
Expected Yield (as a percent)	2.00%
Expected Life Time Cumulative Loss (as a percent)	6.00%
Weighted Average Life	3 years
Level 3 | MSRs (11) | DCF
Financial Assets:
MSRs (11)	$ 160,130	$ 145,993
Unobservable Inputs
Discount Rate	9.75%	9.90%
Level 3 | MSRs (11) | DCF | Minimum
Unobservable Inputs
Prepayment rate (CPR)	3.92%	0.06%
Level 3 | MSRs (11) | DCF | Maximum
Unobservable Inputs
Prepayment rate (CPR)	85.90%	46.95%
Level 3 | MSRs (11) | DCF | Weighted Average
Unobservable Inputs
Prepayment rate (CPR)	8.20%	9.80%

FAIR VALUE (Fair Value of Finan

FAIR VALUE (Fair Value of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
AFS investment securities	$ 13,321,594	$ 14,413,183
Investment in debt securities HTM	2,797,698	1,773,938
Other investments - trading securities	3,024	1
LHFI, net	76,265,119	76,829,277
Derivatives	581,154	456,513
Financial liabilities:
Derivatives	557,404	411,575
Recurring
Financial assets:
AFS investment securities	13,321,594	14,402,369
Other investments - trading securities	3,024	1
LHFS	162,468	197,691
MSRs (11)	160,130	145,993
Derivatives	588,650	463,244
Financial liabilities:
Derivatives	570,659	427,811
Recurring | Equity securities
Financial assets:
Equity securities excluded in accordance with adoption of ASU 2015-07		10,800
Level 1 | Recurring
Financial assets:
AFS investment securities	174,439	139,615
Other investments - trading securities	1	1
LHFS	0	0
MSRs (11)	0	0
Derivatives	0	0
Financial liabilities:
Derivatives	0	0
Level 2 | Recurring
Financial assets:
AFS investment securities	12,798,521	13,912,502
Other investments - trading securities	3,023	0
LHFS	162,468	197,691
MSRs (11)	0	0
Derivatives	586,396	461,139
Financial liabilities:
Derivatives	570,150	427,217
Level 3 | Recurring
Financial assets:
AFS investment securities	348,634	350,252
Other investments - trading securities	0	0
LHFS	0	0
MSRs (11)	160,130	145,993
Derivatives	2,254	2,105
Financial liabilities:
Derivatives	509	594
Carrying Value
Financial assets:
Cash and amounts due from depository institutions	7,900,607	6,519,967
AFS investment securities	13,321,594	14,402,369
Investment in debt securities HTM	2,877,357	1,799,808
Other investments - trading securities	3,024	1
LHFI, net	76,265,119	76,829,277
LHFS	1,960,695	2,522,486
Restricted cash	3,810,962	3,818,807
MSRs (11)	163,148	149,197
Derivatives	588,650	463,244
Financial liabilities:
Deposits	61,841,175	60,831,103
Borrowings and other debt obligations	38,350,245	39,003,313
Derivatives	570,659	427,811
Fair Value
Financial assets:
Cash and amounts due from depository institutions	7,900,607	6,519,967
AFS investment securities	13,321,594	14,402,369
Investment in debt securities HTM	2,797,698	1,773,938
Other investments - trading securities	3,024	1
LHFI, net	77,793,838	78,579,144
LHFS	1,960,690	2,522,521
Restricted cash	3,810,962	3,818,807
MSRs (11)	169,511	155,266
Derivatives	588,650	463,244
Financial liabilities:
Deposits	61,598,475	60,864,110
Borrowings and other debt obligations	38,525,215	39,335,087
Derivatives	570,659	427,811
Fair Value | Level 1
Financial assets:
Cash and amounts due from depository institutions	7,900,607	6,519,967
AFS investment securities	174,439	139,615
Investment in debt securities HTM	0	0
Other investments - trading securities	1	1
LHFI, net	0	0
LHFS	0	0
Restricted cash	3,810,962	3,818,807
MSRs (11)	0	0
Derivatives	0	0
Financial liabilities:
Deposits	53,343,250	55,456,511
Borrowings and other debt obligations	0	0
Derivatives	0	0
Fair Value | Level 2
Financial assets:
Cash and amounts due from depository institutions	0	0
AFS investment securities	12,798,521	13,912,502
Investment in debt securities HTM	2,797,698	1,773,938
Other investments - trading securities	3,023	0
LHFI, net	42,339	136,832
LHFS	162,468	197,691
Restricted cash	0	0
MSRs (11)	0	0
Derivatives	586,396	461,139
Financial liabilities:
Deposits	8,255,225	5,407,599
Borrowings and other debt obligations	23,769,098	23,281,166
Derivatives	570,150	427,217
Fair Value | Level 3
Financial assets:
Cash and amounts due from depository institutions	0	0
AFS investment securities	348,634	350,252
Investment in debt securities HTM	0	0
Other investments - trading securities	0	0
LHFI, net	77,751,499	78,442,312
LHFS	1,798,222	2,324,830
Restricted cash	0	0
MSRs (11)	169,511	155,266
Derivatives	2,254	2,105
Financial liabilities:
Deposits	0	0
Borrowings and other debt obligations	14,756,117	16,053,921
Derivatives	$ 509	$ 594

FAIR VALUE (Fair Value Option f

FAIR VALUE (Fair Value Option for Financial Assets and Liabilities) (Details) - USD ($) $ in Thousands	Jan. 28, 2014	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Fair Value
Nonaccrual loans		$ 9,420		$ 15,023
Aggregate Unpaid Principal Balance
Nonaccrual loans		13,044		19,836
Difference
Nonaccrual loans		(3,624)		(4,813)
Residential mortgages
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
MSRs (11)		160,130	$ 149,455	145,993	$ 146,589
Change in fair value due to valuation assumptions		$ 15,000	$ 1,500
LHFS
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Threshold period for discontinuing and reversing accrual of interest (more than)		90 days
Fair Value
LHFS		$ 162,468		197,691
Aggregate Unpaid Principal Balance
LHFS		161,818		194,928
Difference
LHFS		650		2,763
RICs HFI
Fair Value
RICs HFI		167,597		186,471
Aggregate Unpaid Principal Balance
RICs HFI		190,587		211,580
Difference
RICs HFI		$ (22,990)		$ (25,109)
SC | RICs HFI
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Threshold period for discontinuing and reversing accrual of interest (more than)	60 days	60 days
Fair Value
RICs HFI	$ 1,900,000
Aggregate Unpaid Principal Balance
RICs HFI	$ 2,600,000

NON-INTEREST INCOME (Schedule o

NON-INTEREST INCOME (Schedule of Non-Interest Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Consumer and commercial fees	$ 138,561	$ 154,349
Lease income	540,896	496,045
Mortgage banking income, net	16,345
BOLI	14,568
Capital market revenue	56,613
Net gain on sale of operating leases	53,200
Asset and wealth management fees	43,337
Loss on sale of non-mortgage loans	(43,910)
Other miscellaneous (loss)/income, net	(15,583)
Net (losses)/gains on sale of investment securities	(663)	519
TOTAL NON-INTEREST INCOME	803,364	728,418
Calculated under Revenue Guidance in Effect before Topic 606
Disaggregation of Revenue [Line Items]
Consumer and commercial fees	137,893	154,349
Lease income		496,045
Mortgage banking income, net		13,174
BOLI		17,299
Capital market revenue		45,817
Net gain on sale of operating leases		22,715
Asset and wealth management fees		36,501
Loss on sale of non-mortgage loans		(69,768)
Other miscellaneous (loss)/income, net		11,767
Net (losses)/gains on sale of investment securities		519
TOTAL NON-INTEREST INCOME	$ 797,008	$ 728,418

NON-INTEREST INCOME (Disaggrega

NON-INTEREST INCOME (Disaggregation by Revenue Source) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	$ 173,978
Consumer and commercial fees	73,204	$ 87,096
Lease income	540,896	496,045
Miscellaneous income/(loss)	15,949	(25,655)
Net (losses)/gains on sale of investment securities	(663)	519
Total Out-of-scope of Revenue from Contracts with Customers	629,386	558,005
TOTAL NON-INTEREST INCOME	803,364	728,418
Depository services
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	58,346
TOTAL NON-INTEREST INCOME		60,440
Commission and trailer fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	29,450
TOTAL NON-INTEREST INCOME		31,168
Interchange income, net
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	13,473
TOTAL NON-INTEREST INCOME		12,649
Underwriting service fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	24,504
TOTAL NON-INTEREST INCOME		24,600
Asset and wealth management fees
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	38,203
TOTAL NON-INTEREST INCOME		28,245
Other revenue from contracts with customers
Disaggregation of Revenue [Line Items]
In-scope of revenue from contracts with customers	$ 10,002
TOTAL NON-INTEREST INCOME		13,311
Total In-scope of Revenue from Contracts with Customers
Disaggregation of Revenue [Line Items]
TOTAL NON-INTEREST INCOME		$ 170,413

COMMITMENTS, CONTINGENCIES A121

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Other Commitments) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Lines of credit outstanding	$ 86,400	$ 90,900
Total commitments	30,258,942	31,129,148
Commitments to extend credit
Other Commitments [Line Items]
Other commitments	28,753,073	29,475,864
Letters of credit
Other Commitments [Line Items]
Other commitments	1,405,521	1,559,297
Letters of credit	1,405,521	1,559,297
Unsecured revolving lines of credit
Other Commitments [Line Items]
Lines of credit outstanding	27,314	27,938
Recourse exposure on sold loans
Other Commitments [Line Items]
Other commitments	46,720	46,572
Commitments to sell loans
Other Commitments [Line Items]
Other commitments	$ 26,314	$ 19,477

COMMITMENTS, CONTINGENCIES A122

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Commitments to Extend Credit) (Details) - Commitments to extend credit - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Other Commitments [Line Items]
Commitments that can be canceled without notice	$ 6,300,000	$ 6,400,000
Commitments to extend credit expiring per period:
1 year or less	5,084,166	5,858,236
Over 1 year to 3 years	4,838,484	5,381,113
Over 3 years to 5 years	4,747,297	4,478,320
Over 5 years	14,083,126	13,758,195
Total	$ 28,753,073	$ 29,475,864
Commitment period	5 years

COMMITMENTS, CONTINGENCIES A123

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Letters of Credit) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Reserve for unfunded lending commitments	$ 89,865	$ 109,111	$ 120,396	$ 122,419
Lines of credit outstanding	$ 86,400	90,900
Letters of credit
Other Commitments [Line Items]
Commitments, weighted average term	1 year 4 months 21 days
Commitment amount	$ 1,405,521	1,559,297
Reserve for unfunded lending commitments	3,500	18,200
Letters of credit expiring per period:
1 year or less	702,190	918,191
Over 1 year to 3 years	328,062	286,505
Over 3 years to 5 years	329,005	312,881
Over 5 years	46,264	41,720
Total	$ 1,405,521	$ 1,559,297

COMMITMENTS, CONTINGENCIES A124

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Loans Sold with Recourse and Commitments to Sell Loans) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Recourse exposure on sold loans
Other Commitments [Line Items]
Retained credit risk, multifamily servicing	$ 0.9	$ 1.3
Recourse exposure on sold loans | FNMA | Multifamily loans
Other Commitments [Line Items]
Loans sold with recourse, unpaid principal balance	$ 102.6	136
Loans sold with recourse, portion of first credit loss position retained, percent	100.00%
Value of underlying collateral	$ 12.2	$ 12.2
Commitments to sell loans
Other Commitments [Line Items]
Forward contracts maturity period (less than)	1 year

COMMITMENTS, CONTINGENCIES A125

COMMITMENTS, CONTINGENCIES AND GUARANTEES (SC Commitments) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2015	May 01, 2017	Jan. 31, 2017	Dec. 31, 2016
Long-term Purchase Commitment [Line Items]
Accrued legal and regulatory liabilities	$ 167,200,000	$ 161,800,000
SC
Long-term Purchase Commitment [Line Items]
Purchase obligation	10,300,000	11,500,000
Loans subject of a demand to repurchase	0
Minimum sales commitment, charged off loan receivables	350,000,000
Threshold for sales subject to market price check (over)	275,000,000
Minimum sales commitment, loans receivable, written off, remaining	88,000,000	98,900,000
SC | Other miscellaneous contingencies
Long-term Purchase Commitment [Line Items]
Accrued legal and regulatory liabilities	3,400,000	6,300,000
SC | Maximum
Long-term Purchase Commitment [Line Items]
Purchase commitment, repurchase rate (up to) (as a percent)			9.99%
Purchase commitment, exercise of repurchase rights, retainer rate (up to) (as a percent)			20.00%
SC | Bluestem | Purchase new advances on personal revolving financing receivable
Long-term Purchase Commitment [Line Items]
Accrued commitments	3,700,000,000	3,900,000,000				$ 4,000,000,000
Purchases of receivables	300,000,000	1,200,000,000
SC | Bluestem | Purchase of receivables related to new opened customer account
Long-term Purchase Commitment [Line Items]
Purchases of receivables	17,400,000
SC | Chrysler
Long-term Purchase Commitment [Line Items]
Financing dedicated to FCA retail financing	$ 4,500,000,000
Commitment to meet escalating penetration rates, period	5 years
SC | Chrysler | Minimum
Long-term Purchase Commitment [Line Items]
Funding available for dealer inventory financing	$ 5,000,000,000
SC | Chrysler | Revenue sharing payments and gain-sharing payments to FCA
Long-term Purchase Commitment [Line Items]
Accrued commitments	$ 11,600,000	6,600,000
SC | Bank of America
Long-term Purchase Commitment [Line Items]
Total commitments					$ 300,000,000
Servicer payments period	6 years
SC | Bank of America | Service performance fee
Long-term Purchase Commitment [Line Items]
Accrued commitments	$ 7,500,000	8,100,000
SC | CBP
Long-term Purchase Commitment [Line Items]
Loss-sharing payment percentage	0.50%
SC | CBP | Maximum | Chrysler
Long-term Purchase Commitment [Line Items]
Purchase amount committed				$ 200,000,000
SC | CBP | Minimum | Chrysler
Long-term Purchase Commitment [Line Items]
Purchase amount committed				$ 50,000,000
SC | CBP | Loss sharing payment
Long-term Purchase Commitment [Line Items]
Accrued commitments	$ 5,500,000	$ 5,600,000

COMMITMENTS, CONTINGENCIES A126

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Impact From Hurricanes) (Details) - Hurricanes $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)	Sep. 30, 2017hurricane
Greater Texas, Florida and Puerto Rico
Unusual or Infrequent Item, or Both [Line Items]
Number of significant hurricanes | hurricane		3
Increase in allowance for loan losses	$ 110
Puerto Rico
Unusual or Infrequent Item, or Both [Line Items]
Maximum loan exposure	3,400
Puerto Rico | Loans to Municipalities
Unusual or Infrequent Item, or Both [Line Items]
Maximum loan exposure	220
Puerto Rico | Consumer
Unusual or Infrequent Item, or Both [Line Items]
Maximum loan exposure	1,600
Puerto Rico | Commercial
Unusual or Infrequent Item, or Both [Line Items]
Maximum loan exposure	$ 1,800

COMMITMENTS, CONTINGENCIES A127

COMMITMENTS, CONTINGENCIES AND GUARANTEES (Legal and Regulatory Proceedings) (Details)	Jan. 03, 2018claim	Sep. 12, 2016USD ($)	Jul. 14, 2016USD ($)	Mar. 26, 2015USD ($)	Feb. 28, 2015USD ($)	Mar. 31, 2018USD ($)claim	Dec. 31, 2014USD ($)	Dec. 31, 2017USD ($)	Oct. 31, 2013USD ($)
Loss Contingencies [Line Items]
Accrued legal and regulatory liabilities						$ 167,200,000		$ 161,800,000
Pending gain (loss) related to litigation settlement						$ 5,200,000
Puerto Rico FINRA Arbitrations
Loss Contingencies [Line Items]
Number of FINRA arbitration cases | claim						379
Number of claims that remain pending | claim						267
Puerto Rico Closed-End Funds Shareholder Derivative and Class Action | Puerto Rico
Loss Contingencies [Line Items]
Bonds (more than)									$ 180,000,000
Closed-end funds									$ 101,000,000
SBNA | Identity Theft Protection Product Matter
Loss Contingencies [Line Items]
Identity theft protection payments returned to customers				$ 6,000,000			$ 37,300,000
SBNA | Overdraft Coverage Consent Order
Loss Contingencies [Line Items]
Remediation payment			$ 10,000,000
SC | Parmelee Lawsuit [Member]
Loss Contingencies [Line Items]
Number of claims dismissed | claim	2
SC | Violation of Service Members Civil Relief Act
Loss Contingencies [Line Items]
SCRA compliance period					5 years
SC | Violation of Service Members Civil Relief Act | Civil Fine
Loss Contingencies [Line Items]
Damages sought, value					$ 55,000
SC | Violation of Service Members Civil Relief Act | Lost Equity for Each Repossession
Loss Contingencies [Line Items]
Damages sought, value					10,000
SC | Violation of Service Members Civil Relief Act | Sought to Collect Repossession-related Fees
Loss Contingencies [Line Items]
Damages sought, value					5,000
Maximum
Loss Contingencies [Line Items]
Estimate of possible loss						$ 260,000,000		$ 255,000,000
Minimum | Puerto Rico Closed-End Funds Shareholder Derivative and Class Action
Loss Contingencies [Line Items]
Damages sought, value		$ 10,000,000
Minimum | SC | Violation of Service Members Civil Relief Act | Civil Fine to Affected Service Members
Loss Contingencies [Line Items]
Damages sought, value					$ 9,400,000

RELATED PARTY TRANSACTIONS (Con

RELATED PARTY TRANSACTIONS (Contributions from Santander) (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Contribution from shareholder		$ 5,741	$ 9,000
Affiliated Entity | Santander
Related Party Transaction [Line Items]
Cash contribution		5,741	9,000	$ 15,300
Adjustment to book value of assets purchased on January 1	$ 300	277	0
Deferred tax asset on purchased assets		3,156	0
Contribution from shareholder		$ 9,174	$ 9,000

RELATED PARTY TRANSACTIONS (Nar

RELATED PARTY TRANSACTIONS (Narrative) (Details) - Affiliated Entity - USD ($) $ in Thousands	Jan. 01, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Santander
Related Party Transaction [Line Items]
Net capital contribution				$ 2,800
Cash contribution		$ 5,741	$ 9,000	15,300
Return of capital				12,500
Adjustment to book value of assets purchased on January 1	$ 300	277	0
Deferred tax asset on purchased assets		3,156	0
SBNA
Related Party Transaction [Line Items]
Assets contributed	3,100
Produban Servicios Informaticos Generales S.L. And Ingenieria De Software Bancario S.L. | Net Book Value, Net Assets Acquired | Santander
Related Party Transaction [Line Items]
Amount of related party transactions	2,800
Produban Servicios Informaticos Generales S.L. And Ingenieria De Software Bancario S.L. | Fair Value, Net Assets Acquired | Santander
Related Party Transaction [Line Items]
Amount of related party transactions	$ 15,300
SC | Santander
Related Party Transaction [Line Items]
Loans at fair value			700,000
Sale of loans securitized		1,500,000
Loss from sale of loans		16,900	$ 2,700
Servicing fee income		15,400		$ 13,000
SC | Purchase of Retail Installment Contracts | SBNA
Related Party Transaction [Line Items]
Additions to servicing asset		$ 24,000

BUSINESS SEGMENT INFORMATION (N

BUSINESS SEGMENT INFORMATION (Narrative) (Details) - USD ($)	May 01, 2013	Mar. 31, 2018
FCA
Segment Reporting Information [Line Items]
Private label financing agreement, term	10 years
GCB
Segment Reporting Information [Line Items]
Minimum annual revenue to service corporations		$ 500,000,000

BUSINESS SEGMENT INFORMATION (S

BUSINESS SEGMENT INFORMATION (Segment Information) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Net interest income	$ 1,495,950	$ 1,602,565
Total non-interest income	803,364	728,418
Provision for credit losses	502,534	735,445
Total expenses	1,443,524	1,352,892
INCOME BEFORE INCOME TAX PROVISION	353,256	242,646
Intersegment revenue/(expense)	0	0
Total assets	129,227,891	136,091,169	$ 128,295,952	$ 128,294,030
Reportable Segments | Consumer & Business Banking
Segment Reporting Information [Line Items]
Net interest income	304,819	262,732
Total non-interest income	82,819	82,534
Provision for credit losses	38,389	22,451
Total expenses	368,639	375,021
INCOME BEFORE INCOME TAX PROVISION	(19,390)	(52,206)
Intersegment revenue/(expense)	678	878
Total assets	18,857,164	17,680,926
Reportable Segments | Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	154,935	152,306
Total non-interest income	33,588	14,923
Provision for credit losses	(9,741)	5,386
Total expenses	84,396	78,339
INCOME BEFORE INCOME TAX PROVISION	113,868	83,504
Intersegment revenue/(expense)	1,531	1,301
Total assets	24,318,734	25,854,624
Reportable Segments | GCB
Segment Reporting Information [Line Items]
Net interest income	32,690	42,228
Total non-interest income	50,639	51,336
Provision for credit losses	(2,055)	(1,364)
Total expenses	58,143	46,608
INCOME BEFORE INCOME TAX PROVISION	27,241	48,320
Intersegment revenue/(expense)	(2,281)	(2,397)
Total assets	7,062,542	9,717,228
Reportable Segments | Other
Segment Reporting Information [Line Items]
Net interest income	62,816	56,728
Total non-interest income	113,424	151,107
Provision for credit losses	6,337	15,610
Total expenses	228,368	226,034
INCOME BEFORE INCOME TAX PROVISION	(58,465)	(33,809)
Intersegment revenue/(expense)	72	218
Total assets	38,944,263	43,776,451
Reportable Segments | SC
Segment Reporting Information [Line Items]
Net interest income	921,737	1,042,925
Total non-interest income	531,736	434,848
Provision for credit losses	458,995	635,013
Total expenses	694,870	621,334
INCOME BEFORE INCOME TAX PROVISION	299,608	221,426
Intersegment revenue/(expense)	0	0
Total assets	40,045,188	39,061,940
SC Purchase Price Adjustments | SC
Segment Reporting Information [Line Items]
Net interest income	9,895	37,305
Total non-interest income	2,686	5,454
Provision for credit losses	10,609	58,349
Total expenses	11,729	11,872
INCOME BEFORE INCOME TAX PROVISION	(9,757)	(27,462)
Intersegment revenue/(expense)	0	0
Total assets	0	0
Eliminations
Segment Reporting Information [Line Items]
Net interest income	9,058	8,341
Total non-interest income	(11,528)	(11,784)
Provision for credit losses	0	0
Total expenses	(2,621)	(6,316)
INCOME BEFORE INCOME TAX PROVISION	151	2,873
Intersegment revenue/(expense)	0	0
Total assets	$ 0	$ 0