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BORROWINGS (Narrative) (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 01, 2019 | Aug. 23, 2012 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2016
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Remaining available balance for the federal funds lines |  |  | $ 602,000 |  | $ 382,000 |  |
Remaining available balance of alternate line of credit |  |  | 25,000 |  | 25,000 |  |
Maximum collateral dependent line of credit with the FHLB |  |  | 4,100,000 |  | 4,000,000 |  |
Subordinated debt |  |  | 158,500 |  |  |  | $ 150,000
Prepayment penalty |  | $ 19,600 |  |  |  |  |
Prepayment penalty amortization expense |  |  | 493 | $ 481 |  |  |
Trust Preferred Capital Notes |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Trust preferred capital notes principal balance |  |  | 150,500 |  |  |  |
Remaining fair value discount on acquired notes |  |  | 15,500 |  |  |  |
Subordinated Debt |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Remaining fair value discount on acquired notes |  |  | $ 1,500 |  | $ 1,600 |  |
Fixed interest rate on debt instrument |  |  |  |  |  |  | 5.00%
Subordinated Debt | LIBOR |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Spread on LIBOR |  |  | 3.175% |  |  |  |
Acquisitions, Prior To 2006 |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Trust preferred capital notes principal balance |  |  | $ 58,500 |  |  |  |
Stellarone and Xenith | Trust Preferred Capital Notes |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Trust preferred capital notes principal balance |  |  | 87,000 |  |  |  |
Access National Bank |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Trust preferred capital notes principal balance | $ 5,000 |  |  |  |  |  |
Access National Bank | Trust Preferred Capital Notes |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Remaining fair value discount on acquired notes | $ 25 |  |  |  |  |  |
Xenith |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Subordinated debt |  |  |  |  |  | $ 8,500 |
Xenith | Subordinated Debt |  |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |  |
Remaining fair value discount on acquired notes |  |  | $ 129 |  |  | $ 259 |
Fixed interest rate on debt instrument |  |  |  |  |  | 6.75% |

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