INVESTMENTS (Other Equity Securities) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Securities Owned [Line Items]
Federal Reserve Bank stock	$ 8,398	$ 8,334
Total equity securities	45,518	46,094
Atlantic Central Bankers Bank Stock
Other Securities Owned [Line Items]
Federal Home Loan Bank of Atlanta stock	$ 37,120	$ 37,760