LOANS, Major Classifications of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 986,643	$ 849,746
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	339,969	285,826
Multifamily Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	56,316	50,452
Commercial Real Estate [Member] | Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	149,137	119,265
Commercial Real Estate [Member] | Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	197,274	188,918
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	77,801	68,339
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	32,783	31,445
All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	133,363	$ 105,501
First National Bankshares Corporation [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	131,022
First National Bankshares Corporation [Member] | Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	52,379
First National Bankshares Corporation [Member] | Multifamily Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,414
First National Bankshares Corporation [Member] | Commercial Real Estate [Member] | Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	22,616
First National Bankshares Corporation [Member] | Commercial Real Estate [Member] | Non Owner Occupied [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,809
First National Bankshares Corporation [Member] | Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,261
First National Bankshares Corporation [Member] | Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,040
First National Bankshares Corporation [Member] | All Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 20,503