Shareholders' Equity - Schedule of accumulated other comprehensive income (loss), net (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended	12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	$ 149,757	$ 147,499	$ 149,048	$ 145,916	$ 142,616	$ 141,374	$ 149,048	$ 141,374
Other comprehensive income before reclassifications, net of tax							679	577
Other comprehensive (loss) income, net of tax	(9)	141	547	50	273	367	679	577
Ending balance	155,050	149,757	147,499	148,034	145,916	142,616	155,050	149,048
Other comprehensive income before reclassifications, tax provision							285
Other comprehensive income, tax							285
Unrealized Gain (Loss) on Securities Available-for-Sale, net of tax
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance			(567)			(1,144)	(567)	(1,144)
Other comprehensive income before reclassifications, net of tax							679	577
Other comprehensive (loss) income, net of tax							679	577
Ending balance	112						112	(567)
Other comprehensive income before reclassifications, tax provision							285	242
Other comprehensive income, tax							285	242
Accumulated Other Comprehensive Income (Loss), Net
Accumulated Other Comprehensive Income (Loss), Net of Tax
Beginning balance	121	(20)	(567)	(504)	(777)	(1,144)	(567)	(1,144)
Other comprehensive (loss) income, net of tax	(9)	141	547	50	273	367
Ending balance	$ 112	$ 121	$ (20)	$ (454)	$ (504)	$ (777)	$ 112	$ (567)