Restatement (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets	[1]	$ 2,884	$ 2,700
Total assets	[1]	314,400	314,382
Other liabilities	[1]	1,217	1,259
Total liabilities	[1]	283,263	283,326
Retained earnings	[1]	16,151	16,077
Total stockholders' equity	[1]	31,137	31,056	$ 31,793	$ 31,775
Total liabilities and stockholders' equity	[1]	314,400	314,382
As Originally Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets		3,151	2,948
Total assets		314,667	314,630
Other liabilities		1,306	1,344
Total liabilities		283,352	283,411
Retained earnings		16,329	16,240
Total stockholders' equity		31,315	31,219	$ 31,893	$ 31,859
Total liabilities and stockholders' equity		$ 314,667	$ 314,630

[1] Restated