Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 2,695	$ 2,432	$ 7,821	$ 6,920
Other comprehensive income (loss)
Unrealized gains (losses) arising during the period	275	(620)	1,786	(2,088)
Amounts reclassified from accumulated other comprehensive income, held-to-maturity	15	20	45	62
Income tax effect	(61)	125	(384)	425
Other comprehensive income (loss)	229	(475)	1,447	(1,601)
Total comprehensive income	$ 2,924	$ 1,957	$ 9,268	$ 5,319