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ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 09, 2020 USD ($) | Feb. 01, 2019 USD ($) shares | Sep. 30, 2020 USD ($) item loan | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |
Number of bank branches | item |  |  | 135 |  |
Number of ATM's | item |  |  | 155 |  |
Goodwill |  |  | $ 935,560 |  | $ 935,560
Cash paid in acquisition |  |  | 0 | $ 12 |
Issuance of preferred stock |  |  | 173 |  | $ 0
Net proceeds from issuance of preferred stock |  |  | 166,356 | $ 0 |
Available-for-sale Securities |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accrued interest receivable |  |  | 55,400 |  |
Held-to-maturity Securities |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Accrued interest receivable |  |  | 5,100 |  |
Access National Bank |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Number of shares equivalent to each share of acquired entity | shares |  | 0.75 |  |  |
Company's common shares issued | shares |  | 15,842,026 |  |  |
Cash paid in acquisition |  | $ 12 |  |  |
Paycheck Protection Program (PPP) |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Total value of loans approved by SBA under the CARES Act |  |  | 1,800,000 |  |
Approved Loan Modification Under the Cares Act |  |  | 769,600 |  |
Loans issued under the CARES Act |  |  | 1,700,000 |  |
Loans, recorded investment under the CARES Act |  |  | 1,600,000 |  |
Loan origination fees Under the CARES Act |  |  | $ 32,600 |  |
Paycheck Protection Program (PPP) | Minimum |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Number of loans processed under the CARES Act | loan |  |  | 11,000 |  |
Series A Preferred Stock |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |
Net proceeds from issuance of preferred stock | $ 166,400 |  |  |  |

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