| **FAIR VALUE (Tables)**                                                                         | 9 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 September 30, 2015 and December 31, 2014. Quoted Prices in ActiveMarkets for IdenticalAssets (Level 1) Significant OtherObservable Inputs(Level 2) SignificantUnobservable Inputs(Level 3) Balance at September 30, 2015 (in thousands)Financial assets:       US Treasury securities$— $3,209,863 $— $3,209,863Corporate debt— 1,563,099 — 1,563,099Asset-backed securities— 321,924 1,622,727 1,944,651Equity securities10,528 — — 10,528State and municipal securities— 761,322 — 761,322Mortgage backed securities— 13,561,721 — 13,561,721Total investment securities available-for-sale10,528 19,417,929 1,622,727 21,051,184Retail installment contracts held for investment— — 374,158 374,158Loans held-for-sale— 280,764 — 280,764Mortgage servicing rights— — 143,535 143,535Derivatives:       Fair value— 3,708 — 3,708Mortgage banking interest rate lock commitments— — 5,480 5,480Customer related— 349,053 — 349,053Foreign exchange— 29,413 — 29,413Mortgage servicing— 3,684 — 3,684Interest rate cap agreements— 24,451 — 24,451Other— 8,620 15 8,635Total financial assets$10,528 $20,117,622 $2,145,915 $22,274,065Financial liabilities:       Derivatives:       Fair value$— $6,445 $— $6,445Cash flow— 71,178 — 71,178Mortgage banking forward sell commitments— 4,200 — 4,200Customer related— 313,048 — 313,048Total return swap— — 282 282Foreign exchange— 28,743 — 28,743Mortgage servicing— 2,399 — 2,399Interest rate swaps— 12,743 — 12,743Option for interest rate cap— 24,462 — 24,462Other— 11,513 136 11,649Total financial liabilities$— $474,731 $418 $475,149NOTE 16. FAIR VALUE (continued) Quoted Prices in ActiveMarkets for IdenticalAssets (Level 1) Significant OtherObservable Inputs(Level 2) SignificantUnobservable Inputs(Level 3) Balance atDecember 31, 2014 (in thousands)Financial assets:       US Treasury securities$— $1,695,767 $— $1,695,767Corporate debt— 2,182,401 — 2,182,401Asset-backed securities— 1,452,760 1,267,643 2,720,403Equity securities10,343 — — 10,343State and municipal securities— 1,823,462 — 1,823,462Mortgage backed securities— 7,475,702 — 7,475,702Total investment securities available-for-sale10,343 14,630,092 1,267,643 15,908,078Trading securities— 833,936 — 833,936Retail installment contracts held for investment— — 845,911 845,911Loans held-for-sale— 213,666 — 213,666Mortgage servicing rights— — 145,047 145,047Derivatives:       Fair value— 2,943 — 2,943Cash flow— 7,619 — 7,619Mortgage banking interest rate lock commitments— — 3,063 3,063Customer related— 289,240 — 289,240Foreign exchange— 20,033 — 20,033Mortgage servicing— 7,432 — 7,432Interest rate swap agreements— 535 — 535Interest rate cap agreements— 49,762 — 49,762Other— 6,536 7 6,543Total financial assets$10,343 $16,061,794 $2,261,671 $18,333,808Financial liabilities:       Derivatives:       Fair value$— $1,759 $— $1,759Cash flow— 20,552 — 20,552Mortgage banking forward sell commitments— 2,424 — 2,424Customer related— 252,955 — 252,955Total return swap— 1,736 282 2,018Foreign exchange— 17,390 — 17,390Mortgage servicing— 7,448 — 7,448Interest rate swaps— 12,743 — 12,743Option for interest rate cap— 49,806 — 49,806Other— 7,823 73 7,896Total financial liabilities$— $374,636 $355 $374,991 |
| Fair Value Measurements, Nonrecurring                                                           | Assets measured at fair value on a nonrecurring basis that were still held on the balance sheet were as follows:NOTE 16. FAIR VALUE (continued) Quoted Prices in ActiveMarkets forIdentical Assets (Level 1) Significant OtherObservable Inputs(Level 2) SignificantUnobservableInputs (Level 3) Fair Value (in thousands)September 30, 2015       Impaired loans held for investment$— $89,338 $360 $89,698Foreclosed assets— 21,908 — 21,908Vehicle inventory— 182,069 — 182,069        December 31, 2014       Impaired loans held for investment$— $101,218 $67,699 $168,917Foreclosed assets— 45,599 — 45,599Vehicle inventory— 136,136 — 136,136                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| 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 September 30,  Nine-Month PeriodEnded September 30,   2015 2014 2015 2014   (in thousands)Impaired loans held for investmentProvision for credit losses $(2,888) $(12,826) $(1,445) $(17,652)Foreclosed assetsOther administrative expense (474) (167) (1,501) (519)   $(3,362) $(12,993) $(2,946) $(18,171)                                                                                                                                                                                                                                                                   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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 nine-month periods endedSeptember 30, 2015 and 2014, respectively.Three-Month Period Ended September 30, 2015         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, June 30, 2015$1,539,483 $494,651 $157,147 $1,473 $2,192,754Losses in other comprehensive income(5,307) — — — (5,307)Gains/(losses) in earnings— 39,296 (13,472) 3,504 29,328Additions/Issuances311,540 — 5,795 — 317,335Settlements(1)(222,989) (159,789) (5,935) 100 (388,613)Balance, September 30, 2015$1,622,727 $374,158 $143,535 $5,077 $2,145,497Changes in unrealized gains (losses) included in earnings related to balances still held at September 30, 2015$— $39,296 $(13,472) $(91) $25,733          Nine-Month Period Ended September 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 $2,715 $2,261,316Losses in other comprehensive income(8,961) — — — (8,961)Gains/(losses) in earnings— 219,837 749 2,067 222,653Additions/Issuances910,135 — 17,124 — 927,259Settlements(1)(546,090) (691,590) (19,385) 295 (1,256,770)Balance, September 30, 2015$1,622,727 $374,158 $143,535 $5,077 $2,145,497Changes in unrealized gains (losses) included in earnings related to balances still held at September 30, 2015$— $219,837 $749 $(350) $220,236(1)Settlements include charge-offs, prepayments, pay downs and maturities.NOTE 16. FAIR VALUE (continued)Three-Month Period Ended September 30, 2014         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, June 30, 2014$1,243,872 $1,273,072 $124,118 $3,741 $2,644,803(Losses) in other comprehensive income(849) — — — (849)Gains/(losses) in earnings— 116,177 (2,726) (2,118) 111,333Additions/Issuances69,543 — 16,078 — 85,621Settlements(1)(138,107) (362,737) (5,679) 107 (506,416)Balance, September 30, 2014$1,174,459 $1,026,512 $131,791 $1,730 $2,334,492Changes in unrealized gains (losses) included in earnings related to balances still held at September 30, 2014$— $116,177 $(2,726) $(91) $113,360          Nine-Month Period Ended September 30, 2014         InvestmentsAvailable-for-Sale Retail Installment Contracts Held for Investment MSRs Derivatives Total (in thousands)Balance, December 31, 2013$52,940 $— $141,787 $164 $194,891Gains in other comprehensive income1,021 — — — 1,021Gains/(losses) in earnings— 475,607 (14,078) 1,212 462,741Additions/Issuances171,869 1,870,383 20,081 — 2,062,333Settlements(1)(222,831) (1,319,478) (15,999) 354 (1,557,954)Transfers into level 31,171,460 — — — 1,171,460Balance, September 30, 2014$1,174,459 $1,026,512 $131,791 $1,730 $2,334,492Changes in unrealized gains (losses) included in earnings related to balances still held at September 30, 2014$— $475,607 $(14,078) $(306) $461,223(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 September 30, 2015 Valuation Technique Unobservable Inputs Range (Weighted Average) (in thousands)      Financial Assets: Asset-backed securities       Financing bonds$1,571,741 Discounted Cash Flow Discount Rate (1) 0.79% - 2.01% (1.10%)Sale-leaseback securities$50,986 Consensus Pricing (2) Offered quotes (3) 130.15%Retail installment contracts held for investment$374,158 Discounted Cash Flow ABS (4) 0.40%     Prepayment rate (CPR) (5) 11.00%     Discount Rate (6) 5.95% - 12.00% (10.63%)     Recovery Rate (7) 25.00% - 43.00% (31.67%)Mortgage servicing rights$143,535 Discounted Cash Flow Prepayment rate (CPR) (8) 0.01% - 36.43% (10.38%)     Discount Rate (9) 9.90%Mortgage banking interest rate lock commitments$5,480 Discounted Cash Flow Pull through percentage (10) 77.46%     MSR value (11) 0.71% - 1.07% (1.02%)(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-lease back securities, the Company owns one security. (4) Based on the historical default rate and adjustments to reflect voluntary prepayments.(5) Based on the analysis of available data from a comparable market securitization of similar assets.(6) Based on the cost of funding of debt issuance and recent historical equity yields.(7) Based on the average severity utilizing reported severity rates and loss severity utilizing available market data from a comparable securitized pool.(8) Average CPR projected from collateral stratified by loan type, note rate and maturity. (9) Based on the nature of the input, a range or weighted average does not exist. (10) Historical weighted average based on principal balance calculated as the percentage of loans originated for sale divided by total commitments less outstanding commitments.  (11) 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: September 30, 2015 Carrying Value Fair Value Level 1 Level 2 Level 3 (in thousands)Financial assets:         Cash and amounts due from depository institutions$4,669,373 $4,669,373 $4,669,373 $— $—Available-for-sale investment securities21,051,184 21,051,184 10,528 19,417,929 1,622,727Loans held for investment, net75,797,375 75,683,065 — 89,338 75,593,727Loans held-for-sale2,990,708 3,041,325 — 3,041,325 —Restricted cash2,431,103 2,431,103 2,431,103 — —Mortgage servicing rights143,535 143,535 — — 143,535Derivatives424,424 424,424 — 418,929 5,495          Financial liabilities:         Deposits55,543,255 55,565,093 47,377,317 8,187,776 —Borrowings and other debt obligations48,371,320 49,378,230 — 39,499,046 9,879,184Derivatives475,149 475,149 — 474,731 418 December 31, 2014 Carrying Value Fair Value Level 1 Level 2 Level 3 (in thousands)Financial assets:         Cash and amounts due from depository institutions$2,234,725 $2,234,725 $2,234,725 $— $—Available-for-sale investment securities15,908,078 15,908,078 10,343 14,630,092 1,267,643Trading securities833,936 833,936 — 833,936 —Loans held for investment, net73,923,745 74,265,569 — 101,218 74,164,351Loans held-for-sale260,252 260,251 — 260,251 —Restricted cash2,024,838 2,024,838 2,024,838 — —Mortgage servicing rights145,047 145,047 — — 145,047Derivatives387,170 387,170 — 384,100 3,070          Financial liabilities:         Deposits52,474,007 52,507,347 45,162,698 7,344,649 —Borrowings and other debt obligations39,709,653 40,147,937 — 30,355,610 9,792,327Derivatives374,991 374,991 — 374,636 355                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |
| Summary of Difference Between Fair Value and Principal Balance of LHFS                          | The following table summarizes the difference between the fair value and the principal balance of LHFS and retail installment contracts measured at fair value as of September 30, 2015.  Fair Value Aggregate Unpaid Principal Balance Difference  (in thousands)Loans held-for-sale $280,764 $273,846 $6,918Nonaccrual loans — — —       Retail installment contracts held for investment $374,158 $496,200 $(122,042)Nonaccrual loans 46,310 72,279 (25,969)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |

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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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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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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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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.
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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
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