Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net income, Before tax amount	$ 5,201	$ 4,109	$ 4,820	$ 6,323	$ 5,207	$ 4,692	$ 4,932	$ (186)	$ 20,453	$ 14,645	$ 15,207
Net unrealized holding (losses)/gains on available-for-sale securities:
Unrealized holding (losses)/gains arising during the period, Before tax amount									(11,867)	6,850	9,327
Reclassification adjustment for (gains)/losses included in net income, Before tax amount									(18)	(24)	26
Other comprehensive income (loss), Before tax amount									(11,885)	6,826	9,353
Unrealized holding (losses)/gains arising during the period, Tax expense (benefit)									(2,492)	1,439	1,959
Reclassification adjustment for (gains)/losses included in net income, Tax expense (benefit)									(4)	(5)	5
Other comprehensive income (loss), Tax expense (benefit)									(2,496)	1,434	1,964
Unrealized holding (losses)/gains arising during the period, Net of tax amount									(9,375)	5,411	7,368
Reclassification adjustment for (gains)/losses included in net income, Net of tax amount									(14)	(19)	21
Other comprehensive income (loss), Net of tax amount									(9,389)	5,392	7,389
Total comprehensive income, Before tax amount									8,568	21,471	24,560
Tax expense (benefit)	1,052	685	951	1,273	1,056	914	998	(406)	3,961	2,562	2,850
Total comprehensive income, Tax expense (benefit)									1,465	3,996	4,814
Net income	$ 4,149	$ 3,424	$ 3,869	$ 5,050	$ 4,151	$ 3,778	$ 3,934	$ 220	16,492	12,083	12,357
Total comprehensive income, Net of tax amount									$ 7,103	$ 17,475	$ 19,746