Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Narrative) (Details)

v3.5.0.2
SECURITIES (Narrative) (Details)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
USD ($)
security
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
security
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
security
Schedule of Investments [Line Items]          
Individual securities that had been in a continuous loss position for more than 12 months, amount $ 85,085,000   $ 85,085,000   $ 46,168,000
Securities that had been in a continuous loss position for more than 12 months, unrealized loss 1,922,000   1,922,000   1,382,000
Transfer from securities available for sale to securities held to maturity   $ 201,800,000 0 $ 201,822,000  
Held to maturity securities unrealized gains before tax   $ 8,100,000 5,600,000   $ 6,800,000
Held-to-maturity securities in continuous loss position for more than 12 months $ 661,000   $ 661,000    
Number of held-to-maturity securities in unrealized loss positions | security 1   1    
Held-to-maturity securities, continuous unrealized loss position, more than 12 months $ 81,000   $ 81,000    
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 23,800,000   $ 23,800,000   $ 23,800,000
Federal Home Loan Bank Stock 39,400,000   39,400,000   28,000,000
Credit-related OTTI $ 0   $ 0   $ 300,000
Available-for-sale Securities          
Schedule of Investments [Line Items]          
Individual securities that had been in a continuous loss position | security 28   28   20