Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
	Jan. 01, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Jan. 01, 2019
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	$ 101,352	$ 111,193	$ 103,509	$ 109,240	$ 101,352	$ 101,352
Other comprehensive income (loss)		(182)	(304)	(466)	(74)
Ending balance	101,352	113,338	105,216	113,338	105,216	109,240
Net unrealized loss on available for sale securities
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	(248)			(372)	(248)	(248)
Reclassification from accumulated other comprehensive income, current period	184
Stockholders' Equity, Adjusted Balance	(64)						$ (372)
Other comprehensive income (loss)				393		(308)
Ending balance		21		21		(372)
Unfunded status of the supplemental retirement plans
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	(462)			(459)	(462)	(462)
Stockholders' Equity, Adjusted Balance	(462)						(459)
Other comprehensive income (loss)				20		3
Ending balance		(439)		(439)		(459)
Net unrealized gain on junior subordinated debentures
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	0			1,505	0	0
Reclassification from accumulated other comprehensive income, current period	1,482
Stockholders' Equity, Adjusted Balance	1,482						$ 1,505
Other comprehensive income (loss)				(879)		23
Ending balance		626		626		1,505
Accumulated other comprehensive income
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	(710)	390	1,186	674	(710)	(710)
Ending balance	$ 956	$ 208	$ 882	$ 208	$ 882	$ 674