Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	$ 353,033	$ 317,687	$ 334,392	$ 301,728
Other comprehensive income or loss before reclassifications	(1,096)	(58)	(3,015)	5,860
Amounts reclassified from accumulated other comprehensive income	35	81	112	244
Other Comprehensive (Loss) Income	(1,061)	23	(2,903)	6,104
Stockholders' equity, ending balance	360,171	325,660	360,171	325,660
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(2,658)	(276)	(816)	(6,357)
Stockholders' equity, ending balance	(3,719)	(253)	(3,719)	(253)
Unrealized Gains and Losses on Available for Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	3,109	6,584	5,799	465
Other comprehensive income or loss before reclassifications	(1,279)	(296)	(3,969)	5,823
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other Comprehensive (Loss) Income	(1,279)	(296)	(3,969)	5,823
Stockholders' equity, ending balance	1,830	6,288	1,830	6,288
Unrealized Loss on Cash Flow Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	1,213	(201)	485	0
Other comprehensive income or loss before reclassifications	183	238	954	37
Amounts reclassified from accumulated other comprehensive income	(25)	0	(68)	0
Other Comprehensive (Loss) Income	158	238	886	37
Stockholders' equity, ending balance	1,371	37	1,371	37
Net Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(5,895)	(5,762)	(5,929)	(5,847)
Other comprehensive income or loss before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	17	42	51	127
Other Comprehensive (Loss) Income	17	42	51	127
Stockholders' equity, ending balance	(5,878)	(5,720)	(5,878)	(5,720)
Net Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(1,085)	(897)	(1,171)	(975)
Other comprehensive income or loss before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	43	39	129	117
Other Comprehensive (Loss) Income	43	39	129	117
Stockholders' equity, ending balance	$ (1,042)	$ (858)	$ (1,042)	$ (858)