| **FAIR VALUE (Tables)**                                                                         | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| **Fair Value Disclosures [Abstract]**                                                           |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| 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 June 30, 2016 and December 31, 2015. Quoted Prices in ActiveMarkets for IdenticalAssets (Level 1) Significant OtherObservable Inputs(Level 2) SignificantUnobservable Inputs(Level 3) Balance at June 30, 2016 (in thousands)Financial assets:       U.S. Treasury securities$— $2,004,753 $— $2,004,753Asset-backed securities— 413,152 1,526,691 1,939,843State and municipal securities— 33 — 33Mortgage backed securities— 15,463,185 — 15,463,185Total investment securities available-for-sale(1)— 17,881,123 1,526,691 19,407,814Retail installment contracts held-for-investment— — 250,703 250,703Loans held-for-sale(2)— 345,191 — 345,191Mortgage servicing rights— — 117,792 117,792Derivatives:       Fair value— 575 — 575Cash flow— 45 — 45Mortgage banking interest rate lock commitments— — 9,978 9,978Customer related— 468,759 — 468,759Foreign exchange— 31,846 — 31,846Mortgage servicing— 24,734 — 24,734Interest rate cap agreements— 6,547 — 6,547Other— 19,390 — 19,390Total financial assets$— $18,778,210 $1,905,164 $20,683,374Financial liabilities:       Derivatives:       Fair value$— $575 $— $575Cash flow— 94,499 — 94,499Mortgage banking forward sell commitments— 7,996 — 7,996Customer related— 434,382 — 434,382Total return swap— — 639 639Foreign exchange— 31,512 — 31,512Mortgage servicing— 3,729 — 3,729Interest rate swaps— 7,225 — 7,225Option for interest rate cap— 6,550 — 6,550Total return settlement— — 53,543 53,543Other— 19,982 243 20,225Total financial liabilities$— $606,450 $54,425 $660,875(1)  Investment securities available-for-sale disclosed on the Condensed Consolidated Balance Sheet at June 30, 2016 includes $10.8 million of equity securities that are not presented within this table in accordance with the adoption of ASU 2015-07. Refer to Note 1 to the Condensed Consolidated Financial Statements for additional details related to this ASU implementation.(2)  LHFS disclosed on the Condensed Consolidated Balance Sheet also includes LHFS that are held at the lower of cost or fair value and are not presented within this table.NOTE 16. FAIR VALUE (continued) Quoted Prices in ActiveMarkets for IdenticalAssets (Level 1) Significant OtherObservable Inputs(Level 2) SignificantUnobservable Inputs(Level 3) Balance atDecember 31, 2015 (in thousands)Financial assets:       U.S. Treasury securities$— $3,188,388 $— $3,188,388Corporate debt— 1,475,574 — 1,475,574Asset-backed securities— 409,270 1,360,240 1,769,510State and municipal securities— 767,880 — 767,880Mortgage backed securities— 13,639,656 — 13,639,656Total investment securities available-for-sale(1)— 19,480,768 1,360,240 20,841,008Retail installment contracts held-for-investment— — 328,655 328,655Loans held-for-sale(2)— 236,760 — 236,760Mortgage servicing rights— — 147,233 147,233Derivatives:       Fair value— 3,742 — 3,742Cash flow— 7,295 — 7,295Mortgage banking interest rate lock commitments— — 2,540 2,540Mortgage banking forward sell commitments— 542 — 542Customer related— 274,998 — 274,998Foreign exchange— 30,262 — 30,262Mortgage servicing— 679 — 679Interest rate swap agreements— 1,176 — 1,176Interest rate cap agreements— 32,950 — 32,950Other— 11,136 10 11,146Total financial assets$— $20,080,308 $1,838,678 $21,918,986Financial liabilities:       Derivatives:       Fair value$— $2,098 $— $2,098Cash flow— 23,047 — 23,047Customer related— 235,639 — 235,639Total return swap— — 282 282Foreign exchange— 30,144 — 30,144Mortgage servicing— 3,502 — 3,502Interest rate swaps— 2,481 — 2,481Option for interest rate cap— 32,977 — 32,977Total return settlement— — 53,432 53,432Other— 14,149 122 14,271Total financial liabilities$— $344,037 $53,836 $397,873(1)  Investment securities available-for-sale disclosed on the Condensed Consolidated Balance Sheet at December 31, 2015 includes $10.5 million of equity securities that are not presented within this table in accordance with the adoption of ASU 2015-07. Refer to Note 1 to the Condensed Consolidated Financial Statements for additional details related to this ASU implementation.(2)  LHFS disclosed on the Condensed Consolidated Balance Sheet also includes LHFS that are held at the lower of cost or fair value and are not presented within this table. |
| Fair Value Measurements, Nonrecurring                                                           | Assets measured at fair value on a nonrecurring basis that were still held on the balance sheet were as follows: Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Fair Value (in thousands)June 30, 2016       Impaired loans held-for-investment$— $306,073 $25,181 $331,254Foreclosed assets— 24,765 — 24,765Vehicle inventory— 232,348 — 232,348Loans held for sale— — 1,019,142 1,019,142        December 31, 2015       Impaired loans held-for-investment$— $122,792 $326 $123,118Foreclosed assets— 27,574 — 27,574Vehicle inventory— 204,120 — 204,120Loans held for sale— — 2,040,813 2,040,813Goodwill— — 1,019,960 1,019,960Indefinite lived intangibles— — 18,000 18,000                                                                                                                                           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| 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: Statement of OperationsLocation Three-Month PeriodEnded June 30,  Six-Month Period Ended June 30,   2016 2015 2016 2015   (in thousands)Impaired loans held-for-investmentProvision for credit losses $(10,789) $(1,731) $(97,796) $(2,261)Foreclosed assetsMiscellaneous income(1) (249) (416) (2,062) (1,027)Loans held for saleMiscellaneous income(1) (94,767) — (158,980) —   $(105,805) $(2,147) $(258,838) $(3,288)(1)  These amounts reduce Miscellaneous income.                                                                                                                                                              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| Rollforward for Recurring Assets and Liabilities                                                | The tables below present the changes in all Level 3 balances for the three-month and six-month periods endedJune 30, 2016 and 2015, respectively.Three-Month Period Ended June 30, 2016         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, March 31, 2016$1,640,423 $285,811 $130,742 $(47,223) $2,009,753Gains in other comprehensive income624 — — — 624Gains/(losses) in earnings— 26,606 (11,468) 1,064 16,202Additions/Issuances220,841 — 4,801 — 225,642Settlements(1)(335,197) (61,714) (6,283) 1,712 (401,482)Balance, June 30, 2016$1,526,691 $250,703 $117,792 $(44,447) $1,850,739Changes in unrealized gains/(losses) included in earnings related to balances still held at June 30, 2016$— $26,606 $(11,468) $(1,922) $13,216          Six-Month Period Ended June 30, 2016         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, December 31, 2015$1,360,240 $328,655 $147,233 $(51,286) $1,784,842Gains in other comprehensive income2,209 — — — 2,209Gains/(losses) in earnings— 53,355 (25,824) 4,074 31,605Additions/Issuances499,527 — 8,392 — 507,919Settlements(1)(335,285) (131,307) (12,009) 2,765 (475,836)Balance, June 30, 2016$1,526,691 $250,703 $117,792 $(44,447) $1,850,739Changes in unrealized gains/(losses) included in earnings related to balances still held at June 30, 2016$— $53,355 $(25,824) $(3,364) $24,167(1)Settlements include charge-offs, prepayments, pay downs and maturities.NOTE 16. FAIR VALUE (continued)Three-Month Period Ended June 30, 2015         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, March 31, 2015$1,514,517 $676,097 $135,452 $(52,951) $2,273,115Losses in other comprehensive income(8,433) — — — (8,433)Gains/(losses) in earnings— 94,049 21,211 (7,341) 107,919Additions/Issuances344,622 — 7,803 — 352,425Settlements(1)(311,223) (275,495) (7,319) 2,700 (591,337)Balance, June 30, 2015$1,539,483 $494,651 $157,147 $(57,592) $2,133,689Changes in unrealized gains/(losses) included in earnings related to balances still held at June 30, 2015$— $94,049 $21,211 $(2,227) $113,033          Six-Month Period Ended June 30, 2015         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, December 31, 2014$1,267,643 $845,911 $145,047 $(46,178) $2,212,423Losses in other comprehensive income(3,654) — — — (3,654)Gains/(losses) in earnings— 180,541 14,221 (15,470) 179,292Additions/Issuances598,595 — 11,329 — 609,924Settlements(1)(323,101) (531,801) (13,450) 4,056 (864,296)Balance, June 30, 2015$1,539,483 $494,651 $157,147 $(57,592) $2,133,689Changes in unrealized gains/(losses) included in earnings related to balances still held at June 30, 2015$— $180,541 $14,221 $(14,292) $180,470(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 assets and liabilities. Fair Value at June 30, 2016 Valuation Technique Unobservable Inputs Range (Weighted Average) (in thousands)      Financial Assets: Asset-backed securities       Financing bonds$1,476,049 Discounted Cash Flow Discount Rate (1) 0.84% - 1.56% (1.04%)Sale-leaseback securities$50,642 Consensus Pricing (2) Offered quotes (3) 128.96%Retail installment contracts held-for-investment$250,703 Discounted Cash Flow Prepayment rate (CPR) (4) 9.50%     Discount Rate (5) 9.50% - 14.50% (10.29%)     Recovery Rate (6) 25.00% - 43.00% (28.69%)Mortgage servicing rights$117,792 Discounted Cash Flow Prepayment rate (CPR) (7) 0.09% - 30.99% (12.97%)     Discount Rate (8) 9.90%Mortgage banking interest rate lock commitments$9,978 Discounted Cash Flow Pull through percentage (9) 77.20%     MSR value (10) 0.74% - 1.06% (1.04%)Financial Liabilities:       Total return settlement$53,543 Discounted Cash Flow Discount Rate (4) 8.12%(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.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| 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: June 30, 2016 Carrying Value Fair Value Level 1 Level 2 Level 3 (in thousands)Financial assets:         Cash and amounts due from depository institutions$2,977,783 $2,977,783 $2,977,783 $— $—Available-for-sale investment securities(1)19,407,814 19,407,814 — 17,881,123 1,526,691Loans held-for-investment, net76,895,508 77,647,383 — 306,073 77,341,310Loans held-for-sale3,257,158 3,295,684 — 345,191 2,950,493Restricted cash3,038,136 3,038,136 3,038,136 — —Mortgage servicing rights117,792 117,792 — — 117,792Derivatives561,874 561,874 — 551,896 9,978          Financial liabilities:         Deposits56,497,699 56,526,089 48,202,010 8,324,079 —Borrowings and other debt obligations46,781,939 47,170,983 — 38,115,867 9,055,116Derivatives660,875 660,875 — 606,450 54,425 December 31, 2015 Carrying Value Fair Value Level 1 Level 2 Level 3 (in thousands)Financial assets:         Cash and amounts due from depository institutions$4,992,042 $4,992,042 $4,992,042 $— $—Available-for-sale investment securities(1)20,841,008 20,841,008 — 19,480,768 1,360,240Loans held-for-investment, net76,213,081 76,290,862 — 122,792 76,168,070Loans held-for-sale3,183,282 3,195,513 — 236,760 2,958,753Restricted cash2,429,729 2,429,729 2,429,729 — —Mortgage servicing rights147,233 147,233 — — 147,233Derivatives365,330 365,330 — 362,780 2,550          Financial liabilities:         Deposits56,114,232 56,121,954 47,601,229 8,520,725 —Borrowings and other debt obligations49,086,103 49,320,778 — 40,117,999 9,202,779Derivatives397,873 397,873 — 344,037 53,836(1)  Investment securities available-for-sale disclosed on the Condensed Consolidated Balance Sheet at June 30, 2016 and December 31, 2015 includes $10.8 million and $10.5 million, respectively, of equity securities that are not presented within these tables in accordance with the adoption of ASU 2015-07. Refer to Note 1 to the Condensed Consolidated Financial Statements for additional details related to this ASU implementation.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
| 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 as of June 30, 2016.  Fair Value Aggregate Unpaid Principal Balance Difference  (in thousands)June 30, 2016      Loans held-for-sale(1) $345,191 $334,972 $10,219Nonaccrual loans — — —Retail installment contracts held-for-investment $250,703 $322,101 $(71,398)Nonaccrual loans 21,230 33,194 (11,964)(1)  LHFS disclosed on the Condensed Consolidated Balance Sheet also includes LHFS that are held at the lower of cost or fair value that are not presented within this table.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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Increases and Decreases in Value of Certain Assets Measured at Fair Value on Nonrecurring Basis [Table Text Block]
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Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.
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| - Definition
Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).
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Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
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| - Definition
Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities.
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No definition available.
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| - Definition
Tabular disclosure of the application of the fair value option for measurement and reporting of eligible financial assets and liabilities (as defined), as well as certain other eligible items (as defined) included in the statement of financial position, whether such option is elected for a single eligible item or a group of similar eligible items and is in addition to other disclosures concerning fair value which the company may be required to provide.  Such disclosure might be expected to include: (1) for items included in the statement of financial position: (a) for each line item in the statement of financial position that includes an item or items for which the fair value option has been elected, provide the aggregate carrying amount of ineligible items included in each line item in the balance sheet, if any; (b) the difference between the aggregate fair value and the aggregate unpaid principal balance (assuming contractual principal amounts and fair value option elected) of: (i) loans and long-term receivables (other than securities otherwise reported at fair value) and (ii) long-term debt instruments; (c) for loans held as assets for which the fair value option has been elected: (i) the aggregate fair value of loans that are 90 days or more past due, (ii) if the policy is to recognize interest income separately from other changes in fair value, the aggregate fair value of loans in nonaccrual status, and (iii) the difference between the aggregate fair value and the aggregate unpaid principal balance for loans that are 90 days or more past due, in nonaccrual status, or both; (2) for items included in the income statement: (a) the amounts of gains and losses from fair value changes included in earnings and in which line in the income statement those gains and losses are reported whether or not combined with gains and losses from items required to be accounted for at fair value; (b) for loans and other receivables held as assets, the estimated amount of gains or losses included in earnings attributable to changes in instrument-specific credit risk; (c) for liabilities with fair values that have been significantly affected during the reporting period by changes in the instrument-specific credit risk, the estimated amount of gains and losses from fair value changes included in earnings that are attributable to changes in the instrument-specific credit risk; and (3) certain other disclosures as required or determined to be provided.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 32 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14217-108612Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (c)(2),(d),(e) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a),(c)(1),(d)(1) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258
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