| **PARENT COMPANY FINANCIAL INFORMATION (Statements of Operations and Comprehensive Income) (Details) - USD ($) $ in Thousands**                                                                                                                                                                                                 | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                                                                                                                                                                          |                 |   |  |   |  |   |
| Income from equity method investments                                                                                                                                                                                                                                                                                           |                 | $ 1,584 |  | $ 4,324 |  | $ (28,323) |
| Interest expense                                                                                                                                                                                                                                                                                                                |                 | 2,207,427 |  | 1,724,203 |  | 1,452,129 |
| Income tax (benefit)/provision                                                                                                                                                                                                                                                                                                  |                 | 472,199 |  | 425,900 |  | (157,040) |
| **Equity in undistributed earnings of:**                                                                                                                                                                                                                                                                                        |                 |   |  |   |  |   |
| NET INCOME ATTRIBUTABLE TO SHUSA                                                                                                                                                                                                                                                                                                |                 | 753,169 |  | 707,404 |  | 552,350 |
| **Other comprehensive income, net of tax:**                                                                                                                                                                                                                                                                                     |                 |   |  |   |  |   |
| Net unrealized (losses)/gains on cash flow hedge derivative financial instruments                                                                                                                                                                                                                                               | [1],[2]         | (301) |  | (3,796) |  |   |
| Net unrealized (losses)/gains on cash flow hedge derivative financial instruments                                                                                                                                                                                                                                               | [1],[2]         |   |  |   |  | 337 |
| Net unrealized gains/(losses) recognized on investment securities                                                                                                                                                                                                                                                               |                 | 222,887 | [2] | (80,891) | [2] | (9,744) |
| Amortization of defined benefit plans                                                                                                                                                                                                                                                                                           | [2]             | 10,859 |  | 560 |  | 4,184 |
| TOTAL OTHER COMPREHENSIVE GAIN / (LOSS), NET OF TAX                                                                                                                                                                                                                                                                             |                 | 233,445 |  | (84,127) |  | (5,223) |
| COMPREHENSIVE INCOME ATTRIBUTABLE TO SHUSA                                                                                                                                                                                                                                                                                      |                 | 986,614 |  | 623,277 |  | 547,127 |
| Parent Company                                                                                                                                                                                                                                                                                                                  |                 |   |  |   |  |   |
| **Condensed Income Statements, Captions [Line Items]**                                                                                                                                                                                                                                                                          |                 |   |  |   |  |   |
| Interest income                                                                                                                                                                                                                                                                                                                 |                 | 176,013 |  | 123,389 |  | 67,369 |
| Income from equity method investments                                                                                                                                                                                                                                                                                           |                 | 2,288 |  | 78 |  | 2,737 |
| Other income                                                                                                                                                                                                                                                                                                                    |                 | 58,373 |  | 67,100 |  | 52,584 |
| Net gains on sale of investment securities                                                                                                                                                                                                                                                                                      |                 | 0 |  | 0 |  | 1,845 |
| Total income                                                                                                                                                                                                                                                                                                                    |                 | 236,674 |  | 190,567 |  | 124,535 |
| Interest expense                                                                                                                                                                                                                                                                                                                |                 | 345,888 |  | 288,006 |  | 214,280 |
| Other expense                                                                                                                                                                                                                                                                                                                   |                 | 234,849 |  | 301,418 |  | 349,882 |
| Total expense                                                                                                                                                                                                                                                                                                                   |                 | 580,737 |  | 589,424 |  | 564,162 |
| Loss before income taxes and equity in earnings of subsidiaries                                                                                                                                                                                                                                                                 |                 | (344,063) |  | (398,857) |  | (439,627) |
| Income tax (benefit)/provision                                                                                                                                                                                                                                                                                                  |                 | (38,732) |  | (51,114) |  | 18,165 |
| Loss before equity in earnings of subsidiaries                                                                                                                                                                                                                                                                                  |                 | (305,331) |  | (347,743) |  | (457,792) |
| **Equity in undistributed earnings of:**                                                                                                                                                                                                                                                                                        |                 |   |  |   |  |   |
| Bank subsidiary                                                                                                                                                                                                                                                                                                                 |                 | 387,938 |  | 489,452 |  | 239,887 |
| Non-bank subsidiaries                                                                                                                                                                                                                                                                                                           |                 | 670,562 |  | 565,695 |  | 770,255 |
| NET INCOME ATTRIBUTABLE TO SHUSA                                                                                                                                                                                                                                                                                                |                 | 753,169 |  | 707,404 |  | 552,350 |
| **Other comprehensive income, net of tax:**                                                                                                                                                                                                                                                                                     |                 |   |  |   |  |   |
| Net unrealized (losses)/gains on cash flow hedge derivative financial instruments                                                                                                                                                                                                                                               | [1],[2]         | (301) |  | (3,796) |  |   |
| Net unrealized (losses)/gains on cash flow hedge derivative financial instruments                                                                                                                                                                                                                                               |                 |   |  |   |  | 337 |
| Net unrealized gains/(losses) recognized on investment securities                                                                                                                                                                                                                                                               |                 | 222,887 |  | (80,891) |  | (9,744) |
| Amortization of defined benefit plans                                                                                                                                                                                                                                                                                           |                 | 10,859 |  | 560 |  | 4,184 |
| TOTAL OTHER COMPREHENSIVE GAIN / (LOSS), NET OF TAX                                                                                                                                                                                                                                                                             |                 | 233,445 |  | (84,127) |  | (5,223) |
| COMPREHENSIVE INCOME ATTRIBUTABLE TO SHUSA                                                                                                                                                                                                                                                                                      |                 | $ 986,614 |  | $ 623,277 |  | $ 547,127 |
|                                                                                                                                                                                                                                                                                                                                 |
| [1]Excludes $(18.3) million, $(3.1) million, and $6.0 million of OCI attributable to NCI for the years ended December 31, 2019, 2018 and 2017, respectively.[2]Excludes $39.1 million impact of OCI reclassified to Retained earnings as a result of the adoption of ASU 2018-02 for the year ended December 31, 2018 |

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.
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Amount of income (loss) for proportionate share of equity method investee's income (loss).
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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Amount of the cost of borrowed funds accounted for as interest expense.
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Amount of operating interest income, including, but not limited to, amortization and accretion of premiums and discounts on securities.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.
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Amount, after tax and reclassification, of gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.
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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax and reclassification adjustments of other comprehensive income (loss).
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Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.
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Amount of expense classified as other.
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| - Definition
Amount of income related to nonoperating activities, classified as other.
+ References
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