Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended							6 Months Ended			12 Months Ended
	Jun. 30, 2020		Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020		Jun. 30, 2019	Dec. 31, 2019
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	$ 117,410		$ 115,988	$ 115,211	$ 113,338	$ 111,193	$ 109,240	$ 115,988		$ 109,240	$ 109,240
Current period comprehensive income (loss)	(227)		458	(327)	(513)	(182)	(284)	231		(466)
Ending balance	117,460	[1]	117,410	115,988	115,211	113,338	111,193	117,460	[1]	113,338	115,988
Net unrealized loss on available for sale securities
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			(175)				(372)	(175)		(372)	(372)
Current period comprehensive income (loss)								522			197
Ending balance	347			(175)				347			(175)
Unfunded status of the supplemental retirement plans
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			(675)				(459)	(675)		(459)	(459)
Current period comprehensive income (loss)								29			(216)
Ending balance	(646)			(675)				(646)			(675)
Net unrealized gain on junior subordinated debentures
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			218				1,505	218		1,505	1,505
Current period comprehensive income (loss)								(320)			(1,287)
Ending balance	(102)			218				(102)			218
Accumulated other comprehensive (loss) income
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	(174)		(632)	(305)	208	390	674	(632)		674	674
Current period comprehensive income (loss)	(227)		458	(327)	(513)	(182)	(284)
Ending balance	$ (401)	[1]	$ (174)	$ (632)	$ (305)	$ 208	$ 390	$ (401)	[1]	$ 208	$ (632)

[1] Excludes 44,568 unvested restricted shares