LOANS, Major Classifications of Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 1,024,823	$ 849,746
Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	342,294	285,826
Multifamily Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	74,165	50,452
Commercial Real Estate [Member] | Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	129,370	119,265
Commercial Real Estate [Member] | Non Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	220,836	188,918
Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	76,736	68,339
Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	30,916	31,445
All Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	150,506	$ 105,501
First National Bankshares Corporation [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	113,850
First National Bankshares Corporation [Member] | Residential Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	45,683
First National Bankshares Corporation [Member] | Multifamily Real Estate [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	3,238
First National Bankshares Corporation [Member] | Commercial Real Estate [Member] | Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	19,190
First National Bankshares Corporation [Member] | Commercial Real Estate [Member] | Non Owner Occupied [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	9,146
First National Bankshares Corporation [Member] | Commercial and Industrial [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	17,582
First National Bankshares Corporation [Member] | Consumer [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	1,885
First National Bankshares Corporation [Member] | All Other [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans	$ 17,126