Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended							9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	$ 117,460	$ 117,410	$ 115,988	$ 115,211	$ 113,338	$ 111,193	$ 109,240	$ 115,988	$ 109,240
Current period comprehensive income (loss)	81	(227)	458	(327)	(513)	(182)	(284)	312	(979)
Ending balance	118,053	117,460	117,410	115,988	115,211	113,338	111,193	118,053	115,211
Net unrealized loss on available for sale securities
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			(175)				(372)	(175)	(372)
Current period comprehensive income (loss)					197			818
Ending balance	643			(175)				643
Unfunded status of the supplemental retirement plans
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			(675)				(459)	(675)	(459)
Current period comprehensive income (loss)					(216)			43
Ending balance	(632)			(675)				(632)
Net unrealized gain on junior subordinated debentures
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance			218				1,505	218	1,505
Current period comprehensive income (loss)					(1,287)			(549)
Ending balance	(331)			218				(331)
Accumulated other comprehensive loss
AOCI Attributable, Net of Tax [Roll Forward]
Beginning balance	(401)	(174)	(632)	(305)	208	390	674	(632)	674
Current period comprehensive income (loss)	81	(227)	458	(327)	(513)	(182)	(284)
Ending balance	$ (320)	$ (401)	$ (174)	$ (632)	$ (305)	$ 208	$ 390	$ (320)	$ (305)