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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) | Dec. 31, 2005 acquisition | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) ATM branch shares | Dec. 31, 2017 USD ($) shares | May 01, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Number of bank branches | branch |  |  |  | 140 |  |
Number of ATM's | ATM |  |  |  | 188 |  |
Number of business acquisitions | acquisition |  | 2 |  |  |  |
Federal Home Loan Bank requires Bank to maintain percentage of stock equal to outstanding borrowings |  |  |  | 4.25% | 4.25% |
Percentage of Federal Reserve Bank of Richmond reserve |  |  |  | 6.00% | 6.00% |
Number of days past due to charge off real estate secured loans |  |  |  | 180 days |  |
Future payments, contractual term |  |  |  | 6 months |  |
Goodwill |  |  |  | $ 727,168,000 | $ 298,528,000 |
Impairment charges for goodwill or intangible assets | $ 0 |  |  | 0 |  |
Liabilities for post retirement benefits payable to other beneficiaries |  |  |  | 10,500,000 | 6,300,000 |
Affordable housing projects, recognized amortization |  |  |  | 922,000 | 1,300,000 |
Affordable housing projects, tax credits |  |  |  | 1,100,000 | 858,000 |
Affordable housing projects, investment amount |  |  |  | 10,800,000 | 11,000,000 |
Affordable housing projects, liability |  |  |  | $ 9,900,000 | $ 7,300,000 |
Stock options granted | shares |  |  |  | 0 | 0 |
Accruals for uncertain tax positions |  |  |  | $ 0 | $ 0 |
Accumulated other comprehensive income (loss) |  |  |  | (10,273,000) | (884,000) |
Retained earnings |  |  |  | $ 467,345,000 | $ 379,468,000 |
Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Commercial loans on nonaccrual status, period |  |  |  | 90 days |  |
Period of independent appraisal or valuation |  |  |  | 12 months |  |
Period past due to change TDR status |  |  |  | 30 days |  |
Estimated useful life of bank premises |  |  |  | 3 years |  |
Percentage of fair value of the derivative instruments for the hedge to be highly effective |  |  |  | 80.00% |  |
Interest rate lock commitments period |  |  |  | 30 days |  |
Tax position benefit recognition threshold |  |  |  | 50.00% |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Period past due to charge off consumer loans non-real estate secured |  |  |  | 120 days |  |
Estimated useful life of bank premises |  |  |  | 50 years |  |
Percentage of fair value of the derivative instruments for the hedge to be highly effective |  |  |  | 125.00% |  |
Interest rate lock commitments period |  |  |  | 120 days |  |
Xenith |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Number of branches | branch |  |  |  | 7 |  |
Accounting Standards Update 2017-12 |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Available for sale debt securities, transfer, amount |  |  | $ 187,400,000 | $ 187,400,000 |  |
Cumulative effects from adoption of new accounting standards |  |  |  |  |  | $ 400,000
Accounting Standards Update 2018-02 |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Accumulated other comprehensive income (loss) |  |  |  |  |  | $ (107,000)
Accounting Standards Update 2017-12 & 2018-02 |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Retained earnings |  |  |  | 293,000 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease, right-of-use asset |  |  |  | 51,500,000 |  |
Operating lease, liability |  |  |  | 51,500,000 |  |
Interest Rate Lock Commitments |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Derivative, amount |  |  |  | $ 0 |  |

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