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ACQUISITIONS (Details) $ / shares in Units, shares in Millions, $ in Millions | Apr. 06, 2022 USD ($) branch $ / shares shares | Feb. 18, 2022 USD ($) branch | Mar. 31, 2022 USD ($) | Jul. 28, 2021 $ / shares
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80 Branches And Deposit Business, HSBC Bank |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Deposits |  | $ 6,300 |  |
Loans receivable, net |  | 1,500 |  |
Estimated increase in goodwill |  | $ 120 |  |
80 Branches And Deposit Business, HSBC Bank | New York City Metro |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch |  | 66 |  |
80 Branches And Deposit Business, HSBC Bank | Mid-Atlantic/Washington D.C. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch |  | 9 |  |
80 Branches And Deposit Business, HSBC Bank | Southeast Florida |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch |  | 5 |  |
Investor Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Deposits |  |  | $ 20,000 |
Loans receivable, net |  |  | $ 23,000 |
Investor Acquisition | Subsequent Event |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of branches acquired | branch | 154 |  |  |
Number of shares issued for acquisition | shares | 73.6 |  |  |
Amount paid to shareholders of Investors | $ 355 |  |  |
Cash consideration, in dollars per share for each share of investors stock (in dollars per share) | $ / shares | $ 1.46 |  |  |
Investor Acquisition | Common Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Stock consideration (in dollars per each share) | $ / shares |  |  |  | $ 0.297

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