6. IMPAIRED AND NONPERFORMING LOANS AND LEASES AND OTHER REAL ESTATE OWNED - Nonaccrual loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Total nonperforming assets	$ 1,337	$ 2,853
Nonperforming loans and leases to total loans and leases	0.12%	0.60%
Total nonperforming assets to total assets	0.20%	0.44%
Nonaccrual loans and leases that are current to terms (less than 30 days past due)
Total nonperforming assets	$ 30	$ 1,603
Nonaccrual loans and leases that are past due
Total nonperforming assets	346	289
Loans and leases past due 90 days and accruing interest
Total nonperforming assets	0	0
Other real estate owned
Total nonperforming assets	$ 961	$ 961