Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	$ 60,007	$ 56,142	$ 54,451
Reclassification of the income tax effect of the Tax Act from accumulated other comprehensive income (loss)			21
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)	62	662
Other comprehensive income (loss) before reclassifications	1,909	(673)	841
Balance	67,122	60,007	56,142
Gains (Losses) on Cash Flow Hedges [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	172	37	17
Reclassification of the income tax effect of the Tax Act from accumulated other comprehensive income (loss)			6
Other comprehensive income (loss) before reclassifications	(250)	135	14
Balance	(78)	172	37
Unrealized Gains (Losses) on Available for Sale Securities [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	(850)	(37)	(765)
Reclassification of the income tax effect of the Tax Act from accumulated other comprehensive income (loss)			(7)
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)		10
Other comprehensive income (loss) before reclassifications	2,142	(823)	735
Balance	1,292	(850)	(37)
Supplemental Executive Retirement Plans [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	140	125	11
Reclassification of the income tax effect of the Tax Act from accumulated other comprehensive income (loss)			22
Other comprehensive income (loss) before reclassifications	17	15	92
Balance	157	140	125
Accumulated Other Comprehensive Income (Loss) [Member]
Changes in Accumulated Other Comprehensive Income [Roll Forward]
Balance	(538)	125	(737)
Reclassification of net unrealized gains on equity securities from accumulated other comprehensive income (loss)		10
Balance	$ 1,371	$ (538)	$ 125