Income Taxes - Reconciliation of Expected Tax Benefit with Pretax Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax rate applied to income before income taxes	$ 27,008	$ 18,381	$ 27,720
Increase (decrease) resulting from the effects of:
Tax law change	0	0	8,552
Nondeductible acquisition costs	125	207	657
Tax exempt interest on loans, obligations of states and political subdivisions and bank owned life insurance	(1,282)	(667)	(1,445)
State income taxes	(1,283)	(874)	(1,007)
Tax credit investments	(72)	(33)	(165)
Stock compensation	(698)	(918)	(1,027)
Other	(36)	0	173
Federal tax provision	23,762	16,096	33,458
State tax provision	6,111	4,163	2,878
Total income tax provision	$ 29,873	$ 20,259	$ 36,336