Income Taxes - Reconciliation of Income Tax Attributable to Pre-tax Income at Federal Statutory Tax Rates to Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax at statutory rate	$ 8,419	$ 10,214	$ 8,448
Tax exempt income, net	(1,223)	(1,382)	(1,403)
Bank owned life insurance	(367)	(276)	(296)
Effect of state tax	576	394	52
Other	(58)	(390)	(291)
Income tax expense	$ 7,347	$ 8,560	$ 6,510
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Tax at statutory rate	21.00%	21.00%	21.00%
Tax exempt income, net	(3.10%)	(2.80%)	(3.50%)
Bank owned life insurance	(0.90%)	(0.60%)	(0.70%)
Effect of state tax	1.40%	0.80%	0.10%
Other	(0.10%)	(0.80%)	(0.70%)
Income tax expense	18.30%	17.60%	16.20%