Income Taxes - Reconciliation of Expected Tax Benefit with Pretax Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax rate applied to income before income taxes	$ 21,122	$ 27,008	$ 18,381
Increase (decrease) resulting from the effects of:
Tax law change	(375)	0	0
Nondeductible acquisition costs	199	125	207
Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance	(1,110)	(1,282)	(667)
State income taxes	(804)	(1,283)	(874)
Tax credit investments	(72)	(72)	(33)
Stock compensation	(111)	(698)	(918)
Other	142	(36)	0
Federal tax provision	18,991	23,762	16,096
State tax provision	3,827	6,111	4,163
Total income tax provision	$ 22,818	$ 29,873	$ 20,259