Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income By Component (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	$ 342,413	$ 309,398	$ 334,392	$ 301,728
Other comprehensive income or loss before reclassifications	418	2,039	(1,919)	5,918
Amounts reclassified from accumulated other comprehensive income	20	97	77	163
Other Comprehensive Income (Loss)	438	2,136	(1,842)	6,081
Stockholders' equity, ending balance	353,033	317,687	353,033	317,687
AOCI Attributable to Parent
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(3,096)	(2,412)	(816)	(6,357)
Stockholders' equity, ending balance	(2,658)	(276)	(2,658)	(276)
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	1,987	4,563	5,799	465
Other comprehensive income or loss before reclassifications	1,122	2,021	(2,690)	6,119
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Other Comprehensive Income (Loss)	1,122	2,021	(2,690)	6,119
Stockholders' equity, ending balance	3,109	6,584	3,109	6,584
Unrealized Loss on Cash Flow Swap
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	1,940	(219)	485	0
Other comprehensive income or loss before reclassifications	(704)	18	771	(201)
Amounts reclassified from accumulated other comprehensive income	(23)	0	(43)	0
Other Comprehensive Income (Loss)	(727)	18	728	(201)
Stockholders' equity, ending balance	1,213	(201)	1,213	(201)
Net Actuarial Gain (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(5,895)	(5,820)	(5,929)	(5,847)
Other comprehensive income or loss before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	0	58	34	85
Other Comprehensive Income (Loss)	0	58	34	85
Stockholders' equity, ending balance	(5,895)	(5,762)	(5,895)	(5,762)
Net Prior Service (Cost) Credit
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	(1,128)	(936)	(1,171)	(975)
Other comprehensive income or loss before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	43	39	86	78
Other Comprehensive Income (Loss)	43	39	86	78
Stockholders' equity, ending balance	$ (1,085)	$ (897)	$ (1,085)	$ (897)