Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net Income	$ 6,776	$ 4,410	$ 4,804	$ 4,105	$ 4,723	$ 4,275	$ 6,180	$ 3,224	$ 20,095	$ 18,402	$ 14,949
Other Comprehensive Income (Loss) (Net of Tax):
Net unrealized gain (loss) on available-for-sale securities									6,091	5,179	(1,058)
Reclassification adjustment for realized (gain) loss on sale of available-for-sale securities									(270)	26	9
Net unrealized gain (loss) on available-for-sale securities									5,821	5,205	(1,049)
Tax expense (benefit)									1,222	1,093	(220)
Other comprehensive income (loss)									4,599	4,112	(829)
Comprehensive Income									$ 24,694	$ 22,514	$ 14,120