| **LOANS AND ALLOWANCE FOR CREDIT LOSSES (Tables)**                                                                 | 3 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| **Loans and Leases Receivable Disclosure [Abstract]**                                                              |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Schedule of Loans Receivable                                                                                       | The following table presents the composition of the gross loans held for investment by type of loan and by fixed and variable rates at the dates indicated: March 31, 2014 December 31, 2013 Amount Percent Amount Percent (dollars in thousands)Commercial loans held for investment:       Commercial real estate loans$8,934,116 12.1% $9,303,885 18.6%Commercial and industrial loans14,163,791 19.1% 12,820,417 25.7%Multi-family loans9,365,927 12.6% 8,237,029 16.5%Other commercial (2)1,802,005 2.4% 1,789,891 3.6%Total commercial loans held for investment34,265,839 46.2% 32,151,222 64.4%Consumer loans secured by real estate:       Residential mortgages9,552,642 12.9% 9,561,187 19.2%Home equity loans and lines of credit6,206,354 8.4% 6,311,694 12.6%Total consumer loans secured by real estate15,758,996 21.3% 15,872,881 31.8%Consumer loans not secured by real estate:       Retail installment contracts and auto loans20,925,635 28.3% 81,804 0.2%Personal unsecured loans1,558,553 2.1% 493,785 1.0%Other consumer (3)1,553,593 2.1% 1,321,985 2.6%Total consumer loans39,796,777 53.8% 17,770,455 35.6%Total loans held for investment (1)$74,062,616 100.0% $49,921,677 100.0%Total loans held for investment:       Fixed rate$46,494,515 62.8% $23,431,663 46.9%Variable rate27,568,101 37.2% 26,490,014 53.1%Total loans held for investment (1)$74,062,616 100.0% $49,921,677 100.0%(1)Total loans held for investment 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 decrease in loan balances of $2.7 billion as of March 31, 2014 and a net increase in loan balances of $122.6 million as of December 31, 2013, respectively. The significant fluctuation between periods is due to the purchase accounting marks resulting from the Change in Control of SCUSA.(2)Other commercial primarily includes commercial equipment vehicle funding leases and loans.(3)Other consumer primarily includes recreational vehicles and marine loans.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Allowance for Credit Losses by Portfolio Segment                                                                   | The activity in the allowance for credit losses by portfolio segment for the three-month period endedMarch 31, 2014 and 2013 was as follows: Three-Month Period Ended March 31, 2014 Commercial Consumer Unallocated Total (in thousands)Allowance for loan and lease losses, beginning of period$443,074 $363,647 $27,616 $834,337(Recovery of) Provision for loan losses15,289 343,168 16,873 375,330Charge-offs(29,590) (147,748) — (177,338)Recoveries5,388 72,875 — 78,263Charge-offs, net of recoveries(24,202) (74,873) — (99,075)Allowance for loan and lease losses, end of period$434,161 $631,942 $44,489 $1,110,592        Reserve for unfunded lending commitments, beginning of period$220,000 $— $— $220,000Provision for unfunded lending commitments(40,000) — — $(40,000)Reserve for unfunded lending commitments, end of period180,000 — — $180,000Total allowance for credit losses, end of period$614,161 $631,942 $44,489 $1,290,592Ending balance, individually evaluated for impairment (2)$265,183 $192,298 $— $457,481Ending balance, collectively evaluated for impairment348,978 439,644 44,489 833,111        Financing receivables:       Ending balance$34,310,467 $40,002,610 $— $74,313,077Ending balance, evaluated at fair value (1)44,627 1,722,187 — 1,766,814Ending balance, individually evaluated for impairment (2)528,224 693,072 — 1,221,296Ending balance, collectively evaluated for impairment33,737,616 37,587,351 — 71,324,967(1)Represents LHFS and those loans for which the Company has elected the fair value option(2)Consumer loans individually evaluated for impairment consists of loans in TDR status  Three-Month Period Ended March 31, 2013 Commercial Consumer Unallocated Total (in thousands)Allowance for loan losses, beginning of period$580,931 $407,259 $25,279 $1,013,469(Recovery of) Provision for loan losses(30,843) 25,889 21,804 16,850Charge-offs(34,339) (56,694) — (91,033)Recoveries22,367 9,439 — 31,806Charge-offs, net of recoveries(11,972) (47,255) — (59,227)Allowance for loan losses, end of period$538,116 $385,893 $47,083 $971,092        Reserve for unfunded lending commitments, beginning of period210,000 — — 210,000Provision for unfunded lending commitments— — — —Reserve for unfunded lending commitments, end of period210,000 — — 210,000Total allowance for credit losses, end of period$748,116 $385,893 $47,083 $1,181,092Ending balance, individually evaluated for impairment(2)307,622 143,529 — $451,151Ending balance, collectively evaluated for impairment440,494 242,364 47,083 $729,941        Financing receivables:       Ending balance$33,053,376 $19,370,706 $— $52,424,082Ending balance, evaluated at fair value(1)— 671,023 — $671,023Ending balance, individually evaluated for impairment(2)560,081 759,238 — $1,319,319Ending balance, collectively evaluated for impairment32,493,295 17,940,445 — $50,433,740(1)Represents LHFS and those loans for which the Company has elected the fair value option(2)Consumer loans individually evaluated for impairment consists of loans in TDR status                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
| Schedule of Non-accrual Loans                                                                                      | The recorded investment in non-accrual loans disaggregated by class of financing receivables is summarized as follows: March 31, 2014 December 31, 2013 (in thousands)Non-accrual loans:   Commercial:   Commercial real estate:   Corporate banking$103,113 $93,100Middle market commercial real estate132,381 143,802Santander real estate capital13,083 13,171Commercial and industrial93,197 97,254Multifamily19,098 21,371Other commercial4,781 3,640Total commercial loans365,653 372,338Consumer:   Residential mortgages460,435 473,566Home equity loans and lines of credit141,408 141,961Retail installment contracts and auto loans449,138 1,205Personal unsecured loans— —Other consumer9,835 9,339Total consumer loans1,060,816 626,071Total non-accrual loans$1,426,469 $998,409    Other real estate owned92,133 88,603Repossessed vehicles137,648 —Other repossessed assets5,518 3,073Total other real estate owned and other repossessed assets235,299 91,676Total non-performing assets$1,661,768 $1,090,085                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               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| Aging Analysis of Loan Portfolio                                                                                   | The age of recorded investments in past due loans and accruing loans greater than 90 days past due disaggregated by class of financing receivables is summarized as follows: As of March 31, 201430-59Days PastDue 60-89DaysPastDue GreaterThan 90Days TotalPast Due Current TotalFinancingReceivables (1) Recorded Investment> 90 DaysandAccruing (in thousands)Commercial:             Commercial real estate:             Corporate banking$27,878 $7,046 $49,018 $83,942 $3,440,691 $3,524,633 —Middle market commercial real estate$— — $86,876 86,876 $3,432,214 3,519,090 —Santander real estate capital$5,800 — $6,771 12,571 $1,889,135 1,901,706 —Commercial and industrial$9,310 $12,151 $57,791 79,252 $14,117,853 14,197,105 —Multifamily$11,137 $709 $6,612 18,458 $9,347,469 9,365,927 —Other commercial$1,842 $727 $1,755 4,324 $1,797,681 1,802,005 —Consumer:             Residential mortgages162,893 74,718 367,399 605,010 9,008,694 9,613,704 —Home equity loans and lines of credit22,600 11,434 79,930 113,964 6,092,390 6,206,354 —Retail installment contracts and auto loans4,822 1,666,338 83,220 1,754,380 19,316,027 21,070,407 —Personal unsecured loans38,679 31,779 4,622 75,080 1,483,473 1,558,553 52,197Other consumer36,497 7,710 28,772 72,979 1,480,614 1,553,593 —Total$321,458 $1,812,612 $772,766 $2,906,836 $71,406,241 $74,313,077 $52,197(1)Financing receivables include LHFS. As of December 31, 201330-59Days PastDue 60-89Days PastDue GreaterThan 90Days TotalPast Due Current TotalFinancingReceivables (1) RecordedInvestment> 90 DaysandAccruing (in thousands)Commercial:             Commercial real estate:             Corporate banking12,758 5,751 57,503 76,012 3,691,858 3,767,870 $—Middle market commercial real estate5,980 13,897 83,809 103,686 3,406,685 3,510,371 —Santander real estate capital4,177 9,705 — 13,882 2,011,762 2,025,644 —Commercial and industrial15,966 4,310 34,354 54,630 12,783,719 12,838,349 —Multifamily2,039 5,235 9,563 16,837 8,220,192 8,237,029 —Other commercial3,412 182 2,171 5,765 1,784,126 1,789,891 —Consumer:             Residential mortgages185,630 86,563 379,076 651,269 9,020,935 9,672,204 —Home equity loans and lines of credit32,017 15,567 80,551 128,135 6,183,559 6,311,694 —Retail installment contracts and auto loans7,900 2,988 1,205 12,093 69,711 81,804 —Personal unsecured loans4,289 1,693 4,536 10,518 483,267 493,785 2,545Other consumer29,641 11,835 31,091 72,567 1,249,418 1,321,985 —Total$303,809 $157,726 $683,859 $1,145,394 $48,905,232 $50,050,626 $2,545(1)Financing receivables include LHFS.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Schedule of Impaired Loans by Class                                                                                |   December 31, 2013  Recorded Investment(1) UnpaidPrincipalBalance RelatedSpecificReserves AverageRecordedInvestment  (in thousands)With no related allowance recorded:        Commercial:        Commercial real estate:         Corporate banking $43,485 $30,131 $— $43,485 Middle market commercial real estate 101,137 128,874 — 101,137 Santander real estate capital 751 751 — 751Commercial and industrial 13,131 42,512 — 13,131Multifamily 27,031 27,031 — 27,031Other commercial — — — —Consumer:        Residential mortgages 92,143 92,143 — 92,143Home equity loans and lines of credit 31,074 31,074 — 31,074Retail installment contracts and auto loans — — — —Personal unsecured loans — — — —Other consumer 8,345 17,420 — 8,345With an allowance recorded:        Commercial:         Corporate banking 53,762 52,100 10,298 53,762 Middle market commercial real estate 118,845 185,649 26,130 118,845 Santander real estate capital 9,382 8,136 1,701 9,382Commercial and industrial 100,224 118,276 50,252 100,224Multifamily 11,418 8,456 2,201 11,418Other commercial 177 177 12 177Consumer:        Residential mortgages 547,329 603,866 124,746 547,329Home equity loans and lines of credit 54,900 63,975 5,479 54,900Retail installment contracts and auto loans — — — —Personal unsecured loans 2,535 2,535 677 2,535Other consumer 17,483 17,482 4,300 17,483Total:        Commercial $479,343 $602,093 $90,594 $479,343Consumer 753,809 828,495 135,202 753,809Total $1,233,152 $1,430,588 $225,796 $1,233,152Impaired loans disaggregated by class of financing receivables are summarized as follows:  March 31, 2014  Recorded Investment(1) UnpaidPrincipalBalance RelatedSpecificReserves AverageRecordedInvestment  (in thousands)With no related allowance recorded:        Commercial:        Commercial real estate:        Corporate banking 55,554 43,388 — 49,520Middle market commercial real estate 110,705 81,782 — 105,921Santander real estate capital 7,122 6,965 — 3,937Commercial and industrial 6,047 2,260 — 9,589Multifamily 26,734 26,734 — 26,883Other commercial 147 147 — 74Consumer:        Residential mortgages 88,186 88,186 — 90,165Home equity loans and lines of credit 29,884 29,884 — 30,479Retail installment contracts and auto loans 46,648 46,648 — 23,324Personal unsecured loans — — — —Other consumer 6,711 6,711 — 7,528With an allowance recorded:        Commercial:        Commercial real estate:        Corporate banking 48,488 47,239 10,516 51,125Middle market commercial real estate 97,104 71,100 20,690 107,975Santander real estate capital 6,679 5,433 1,254 8,031Commercial and industrial 98,788 92,234 49,686 99,506Multifamily 6,064 5,858 1,521 8,741Other commercial 1,176 1,176 457 677Consumer:        Residential mortgages 553,419 498,288 125,256 550,374Home equity loans and lines of credit 55,899 47,110 5,876 55,400Retail installment contracts and auto loans 121,041 117,746 57,434 60,521  Personal unsecured loans 2,053 — 515 2,294  Other consumer 17,264 8,813 4,276 17,374Total:        Commercial $464,608 $384,316 $84,124 $471,979Consumer 921,105 843,386 193,357 837,459Total $1,385,713 $1,227,702 $277,481 1,309,438 |
| **Financing Receivable, Recorded Investment [Line Items]**                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       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| Schedule of Financing Receivable, by Credit Score                                                                  | Consumer financing receivables, including LHFS, for which credit score is a core component of the allowance model are summarized by credit score as follows:March 31, 2014            Credit Score Range(2) Retail installment contracts and auto loans Percent Personal unsecured loans balance Percent Home equity loans and lines of credit Percent  (dollars in thousands)    <600 $12,438,256 59.0% $345,006 22.1% $348,892 5.6%600-639 5,483,758 26.0% 476,285 30.6% 297,655 4.8%640-679 3,088,553 14.7% 293,184 18.8% 549,833 8.9%680-719 — —% 54,820 3.5% 888,979 14.3%720-759 — —% 55,832 3.6% 1,236,242 19.9%>=760 — —% 55,864 3.6% 2,882,785 46.5%N/A(1) 59,840 0.3% 277,562 17.8% 1,968 —%Total $21,070,407 100.0% $1,558,553 100.0% $6,206,354 100.0%(1)Consists primarily of loans serviced by third parties. Loans serviced by third parties do not receive refreshed FICO scores. (2)Credit scores updated quarterly.NOTE 5. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued)December 31, 2013        Credit Score Range(2) Personal unsecured loans balance Percent Home equity loans and lines of credit Percent  (dollars in thousands)<600 $10,221 2.1% $336,713 5.3%600-639 6,152 1.2% 281,186 4.5%640-679 24,855 5.0% 524,937 8.3%680-719 53,842 11.0% 869,460 13.8%720-759 55,546 11.2% 1,223,179 19.4%>=760 60,002 12.2% 2,775,970 44.0%N/A(1) 283,167 57.3% 300,249 4.7%Total $493,785 100.0% $6,311,694 100.0%(1)Consists primarily of loans serviced by third parties. Loans serviced by third parties do not receive refreshed FICO scores. (2)Credit scores updated quarterly                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule of Financing Receivable by LTV                                                                            | Residential mortgage and home equity financing receivables by combined loan-to-value ("CLTV") range are summarized as follows:March 31, 2014          Residential mortgages Home equity loans and lines of creditCLTV Range(1) UPB Percent UPB Percent  (dollars in thousands)<=80% $7,059,941 73.4% $3,885,396 62.6%80.01 - 90% 795,112 8.3% 1,027,382 16.6%90.01 - 100% 619,743 6.4% 356,706 5.7%100.01 - 120% 429,497 4.5% 345,694 5.6%120.01 - 140% 170,903 1.8% 134,314 2.2%>140% 187,609 2.0% 111,324 1.8%N/A 350,899 3.6% 345,538 5.5%Total(2) $9,613,704 100.0% $6,206,354 100.0%December 31, 2013          Residential mortgages Home equity loans and lines of creditCLTV Range(1) UPB Percent UPB Percent  (dollars in thousands)<=80% $7,124,926 73.7% $4,061,541 64.3%80.01 - 90% 665,806 6.9% 946,933 15.0%90.01 - 100% 647,079 6.7% 357,817 5.7%100.01 - 120% 451,833 4.7% 338,194 5.4%120.01 - 140% 188,201 1.9% 125,099 2.0%>140% 199,016 2.1% 108,664 1.7%N/A 395,343 4.0% 373,446 5.9%Total(2) $9,672,204 100.0% $6,311,694 100.0%(1)CLTV is inclusive of senior lien balances and updated as deemed necessary. CLTV ranges represent the unpaid principal balance except for the "N/A" range, which represents the unpaid principal balance plus deferred loan origination costs, net of deferred loan fees and unamortized purchase premiums, net of discounts as well as purchase accounting adjustments. (2)Financing receivables includes loans held for sale.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Schedule of Troubled Debt Restructurings on Financing Receivables, Performing and Nonperforming [Table Text Block] | The following table summarizes the Company’s performing and non-performing TDRs at the dates indicated: March 31, 2014 December 31, 2013 (in thousands)Performing$787,485 $656,606Non-performing345,621 347,037Total$1,133,106 $1,003,643                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             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| Schedule of Troubled Debt Restructurings                                                                           | The following tables detail the activity of TDRs for the three-month period endedMarch 31, 2014 and March 31, 2013, respectively:  Three-Month Period Ended March 31, 2014 Number ofContracts Pre-ModificationOutstanding RecordedInvestment (1) Post-ModificationOutstanding RecordedInvestment (2) (dollars in thousands)Commercial: Commercial real estate:      Corporate Banking2 3,524 3,505Commercial and industrial12 18,793 18,207Other commercial1 498 500Consumer:     Residential mortgages (3)79 17,811 17,670 Home equity loans and lines of credit26 2,285 2,285 Retail installment contracts and auto loans  12,714 129,141 126,932 Other consumer1 41 42Total12,835 $172,093 $169,141(1)Pre-modification outstanding recorded investment amount is the month-end balance prior to the month the modification occurred.(2)Post-modification outstanding recorded investment amount is the month-end balance for the month that the modification occurred.(3)The post-modification outstanding recorded investment amounts for residential mortgages exclude interest reserves. NOTE 5. LOANS AND ALLOWANCE FOR CREDIT LOSSES (continued) Three-Month Period Ended March 31, 2013 Number of Contracts Pre-ModificationOutstanding RecordedInvestment (1) Post-ModificationOutstanding RecordedInvestment (2) (dollars in thousands)Commercial:     Commercial real estate:     Corporate banking1 $19,750 $18,767Santander real estate capital1 2,724 2,188Other commercial5 1,712 1,696Consumer:     Residential mortgages (3)92 15,779 16,132Home equity loans and lines of credit80 6,243 6,242Total179 $46,208 $45,025(1)Pre-modification outstanding recorded investment amount is the month-end balance prior to the month the modification occurred. (2)Post-modification outstanding recorded investment amount is the month-end balance for the month that the modification occurred.(3)The post-modification outstanding recorded investment amounts for residential mortgages exclude interest reserves.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
| Schedule of Troubled Debt Restructurings Subsequently Defaulted                                                    | The following table details TDRs that were modified during the past twelve-month period and have subsequently defaulted during the three-month period endedMarch 31, 2014 and March 31, 2013, respectively.Three-Month PeriodEnded March 31,  2014 2013 Number ofContracts Recorded Investment(1) Number ofContracts RecordedInvestment(1) (dollars in thousands)Consumer:       Residential mortgages12 $1,915 10 $2,794Home equity loans and lines of credit — — 2 376Total12 $1,915 12 $3,170(1)The recorded investment represents the period-end balance at March 31, 2014 and 2013. Does not include Chapter 7 bankruptcy TDRs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  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| **Financing Receivable, Recorded Investment [Line Items]**                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Schedule of Loans by Credit Quality Indicators                                                                     | Commercial loan credit quality indicators by class of financing receivables are summarized as follows:  Commercial Real Estate        March 31, 2014 Corporatebanking Middlemarketcommercialreal estate Santanderreal estatecapital Commercial and industrial Multifamily Remainingcommercial Total (1)  (in thousands)Regulatory Rating:              Pass $3,155,786 $3,110,039 $1,651,802 $13,711,203 $9,239,610 $1,776,638 $32,645,078Special Mention 107,491 98,115 119,556 256,282 58,915 17,419 657,778Substandard 243,975 238,706 129,539 196,650 66,904 7,800 883,574Doubtful 17,381 72,231 808 32,970 498 148 124,036Total commercial loans $3,524,633 $3,519,091 $1,901,705 $14,197,105 $9,365,927 $1,802,005 $34,310,466(1)Financing receivables include LHFS.  Commercial Real Estate        December 31, 2013 Corporatebanking Middlemarketcommercialreal estate Santanderreal estatecapital Commercial and industrial Multifamily Remainingcommercial Total (1)  (in thousands)Regulatory Rating:              Pass 3,385,253 3,068,667 1,779,544 12,320,254 8,109,023 1,764,157 30,426,898Special Mention 106,001 62,062 112,257 283,939 59,379 17,196 640,834Substandard 260,122 310,318 132,999 202,347 63,284 8,361 977,431Doubtful 16,494 69,325 844 31,808 5,343 177 123,991Total commercial loans 3,767,870 3,510,372—2,025,644—12,838,348—8,237,029—1,789,891 32,169,154                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Consumer [Member]                                                                                                  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| **Financing Receivable, Recorded Investment [Line Items]**                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Schedule of Loans by Credit Quality Indicators                                                                     | Consumer credit quality disaggregated by class of financing receivables is summarized as follows:March 31, 2014 Residentialmortgages Home equity loans and lines of credit Retail installment contracts and auto loans Personal unsecured loans Otherconsumer Total(1)  (in thousands)Performing $9,153,269 $6,096,735 $19,318,989 $1,528,047 $1,516,752 $37,613,792Non-performing 460,435 109,619 1,751,418 30,506 36,841 2,388,819Total consumer loans $9,613,704 $6,206,354 $21,070,407 $1,558,553 $1,553,593 $40,002,611(1)Financing receivables include LHFS.December 31, 2013 Residentialmortgages Home equity loans and lines of credit Retail installment contracts and auto loans Personal unsecured loans Otherconsumer Total(1)  (in thousands)Performing $9,198,639 $6,203,419 $79,936 $493,785 $1,279,622 $17,255,401Non-performing 473,565 108,275 1,868 — 42,363 626,071Total consumer loans $9,672,204 $6,311,694 $81,804 $493,785 $1,321,985 $17,881,472(1)Financing receivables include LHFS.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      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| Commercial Loans Held for Investment [Member]                                                                      |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Financing Receivable, Recorded Investment [Line Items]**                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Schedule of Loans Receivable by Credit Quality Classification                                                      | The following table reconciles the Company's recorded investment classified by its major loan classifications to its commercial loan classifications utilized in its determination of the allowance for loan losses and other credit quality disclosures at March 31, 2014 and December 31, 2013, respectively:Commercial Portfolio Segment(2)    Major Loan Classifications(1) March 31, 2014 December 31, 2013  (in thousands)Commercial loans held for investment:  Commercial real estate    Corporate banking $3,566,377 $3,767,869Middle markets commercial real estate (3) $3,466,034 $3,510,371Santander real estate capital $1,901,705 $2,025,645Total commercial real estate $8,934,116 9,303,885Commercial and industrial loans (4) 14,163,791 12,820,417Multi-family loans 9,365,927 8,237,029Other commercial 1,802,005 1,789,891Total commercial loans held for investment $34,265,839 $32,151,222(1)These represent the Company's loan categories based on the SEC's Regulation S-X, Article 9. (2)These represent the Company's loan classes used to determine its allowance for loan and lease losses in accordance with ASC 310-10.(3)Middle markets commercial real estate excluded $11.3 million and $0.0 million of LHFS at March 31, 2014 and December 31, 2013, respectively.(4)Commercial and industrial loans excluded $33.3 million and $17.9 million of LHFS at March 31, 2014 and December 31, 2013, respectively.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Consumer Loans Held for Investment [Member]                                                                        |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| **Financing Receivable, Recorded Investment [Line Items]**                                                         |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     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| Schedule of Loans Receivable by Credit Quality Classification                                                      | Consumer Portfolio Segment(2)    Major Loan Classifications(1) March 31, 2014 December 31, 2013  (in thousands)Consumer loans secured by real estate:   Residential mortgages (3) 9,552,642 9,561,187Home equity loans and lines of credit 6,206,354 6,311,694Total consumer loans secured by real estate 15,758,996 15,872,881Consumer loans not secured by real estate:   Retail installment contracts and auto loans (4) 20,925,635 81,804Personal unsecured loans 1,558,553 493,785Other consumer 1,553,593 1,321,985Total consumer loans held for investment $39,796,777 $17,770,455 (1)These represent the Company's loan categories based on the SEC's Regulation S-X, Article 9.(2)These represent the Company's loan classes used to determine its allowance for loan and lease losses in accordance with ASC 310-10.(3)Home mortgages excludes $61.1 million and $111.0 million of LHFS at March 31, 2014 and December 31, 2013, respectively.(4)Retail installment contracts and auto loans excludes $144.8 million and $0.0 million of LHFS at March 31, 2014 and December 31, 2013, respectively.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          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Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account.
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| - Definition
Tabular disclosure of financing receivables by credit quality indicator. The credit quality indicator is a statistic about the credit quality of financing receivables. Examples include, but not limited to, consumer credit risk scores, credit-rating-agency ratings, an entity's internal credit risk grades, loan-to-value ratios, collateral, collection experience and other internal metrics.
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Tabular disclosure of impaired financing receivables.
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| - Definition
Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status.
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| - Definition
Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.
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| - Definition
Tabular disclosure of nonaccrual and past due financing receivables (such as loans and trade receivables), including: (a) the recorded investment in loans and trade receivables, if applicable, on nonaccrual status as of each balance sheet date (b) the recorded investment in loans and trade receivables, if applicable, past due 90 days or more and still accruing.
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| - Definition
Tabular disclosure of financing receivables and troubled debt restructurings.
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