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SECURITIES (Narrative) (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
Schedule of Investments [Line Items] |  |  |
Available for sale securities that had been in a continuous loss position for more than 12 months, amount |  | $ 385,433,000 | $ 197,640,000
Available-for-sale securities, continuous unrealized loss position, 12 months or longer, accumulated loss |  | 10,184,000 | 4,188,000
Held to maturity securities unrealized gains before tax |  | $ 119,000 | 3,600,000
Held-to-maturity securities in a continuous loss position for longer than 12 months, fair value |  |  | $ 1,084,000
Held-to-maturity securities in a continuous loss position for longer than 12 months, number of securities | security |  | 0 | 2
Held to maturity securities in a continuous loss position, more than 12 months, accumulated loss |  |  | $ 31,000
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%
Restricted equity securities consist of Federal Reserve Bank stock |  | $ 52,600,000 | $ 27,600,000
Federal Home Loan Bank Stock |  | 72,000,000 | $ 47,700,000
Credit-related OTTI |  | $ 0 |
Available-for-sale Securities |  |  |
Schedule of Investments [Line Items] |  |  |
Available for sale securities that had been in a continuous loss position | security |  | 138 | 71
Accounting Standards Update 2017-12 |  |  |
Schedule of Investments [Line Items] |  |  |
Available for sale debt securities, transfer, amount | $ 187,400,000 | $ 187,400,000 |

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