Quarterly report pursuant to Section 13 or 15(d)

SECURITIES (Narrative) (Details)

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SECURITIES (Narrative) (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
item
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Schedule of Investments [Line Items]          
Federal Home Loan Bank requires Bank to maintain percentage of stock equal to outstanding borrowings       4.25% 4.50%
Percentage of Federal Reserve Bank of Richmond reserve       6.00% 6.00%
Restricted equity securities consist of Federal Reserve Bank stock   $ 23,800   $ 23,800 $ 23,800
Federal Home Loan Bank Stock   28,900   28,900 31,000
Securities in a continuous loss position, more than 12 months, unrealized losses       1,129 1,134
Individual securities that had been in a continuous loss position for more than 12 months, amount   52,522   52,522 $ 96,404
Transfer from securities available for sale to securities held to maturity     $ 201,800 201,822  
Held to maturity securities unrealized gains before tax $ 8,100 7,300      
Credit-related OTTI   $ 300   $ 300  
Available-for-sale Securities [Member]          
Schedule of Investments [Line Items]          
Individual securities that had been in a continuous loss position | item   22   22 60
Obligations of States and Political Subdivisions [Member]          
Schedule of Investments [Line Items]          
Securities in a continuous loss position, more than 12 months, unrealized losses       $ 260 $ 628
Individual securities that had been in a continuous loss position for more than 12 months, amount   $ 6,610   $ 6,610 $ 42,514