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BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Subordinated Borrowing [Line Items] |  |  |
Remaining available balance for the federal funds lines | $ 1,000,000 | $ 997,000 |
Maximum collateral dependent line of credit with the FHLB | 6,000,000 | 6,000,000 |
Trust Preferred Capital Securities | 150,500 | 150,500 |
Fair value discount | 15,296 | 16,435 |
Net proceeds from issuance of long-term borrowings | 0 | 246,869 | $ 0
Subordinated Debt | 250,000 | 250,000 |
Long-term debt, early repayments | 0 | 364,695 | $ 619,616
Remaining borrowing capacity | 25,000 | 25,000 |
2026 Subordinate Debt |  |  |
Subordinated Borrowing [Line Items] |  |  |
Subordinated Debt |  | $ 150,000 |
Stated percentage on debt instrument |  | 5.00% |
2031 Subordinate Debt |  |  |
Subordinated Borrowing [Line Items] |  |  |
Net proceeds from issuance of long-term borrowings |  | $ 246,900 |
Subordinated Debt | $ 250,000 | $ 250,000 |
Stated percentage on debt instrument | 2.875% | 2.875% |
Three-month LIBOR rate plus | 0.00% | 0.00% |
Maturity date | Dec. 15, 2031 | Dec. 15, 2031 |
StellarOne Bank and Xenith | Trust Preferred Capital Notes |  |  |
Subordinated Borrowing [Line Items] |  |  |
Trust preferred capital notes principal balance | $ 58,500 |  |
Trust preferred securities acquired | $ 92,000 |  |

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