Income Taxes - Deferred tax assets and deferred tax liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Deferred Tax Assets:
Allowance for loan losses	$ 2,132	$ 1,622
Net operating loss carryforward - federal and state	4,270	259
Bank premises and equipment and deferred rent	213	280
Unrealized loss on securities available for sale	732	450
Nonqualified stock options and restricted stock	496	261
Organizational and start-up expenses	61	68
Acquisition accounting adjustments	372	58
Non-accrual loan interest	20	3
Deferred loan (fees) costs	295	154
Net Deferred Tax Assets	$ 8,591	$ 3,155