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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Amounts
Income tax at statutory rates	$ 6,136,000	$ 5,026,000	$ 4,734,000
State income taxes	1,449,000	695,000	575,000
Tax-exempt interest income	(493,000)	(453,000)	(574,000)
Excess compensation	328,000
Change in tax law	(326,000)
Income from bank-owned life insurance	(107,000)	(149,000)	(89,000)
Investments in qualified housing projects	(82,000)	(93,000)	(85,000)
Share-based compensation	(77,000)	(126,000)	(103,000)
Merger related expenses	29,000	96,000
Other	(62,000)	86,000	63,000
Income tax expense	$ 6,795,000	$ 5,082,000	$ 4,521,000
Percent of Pre-tax Income
Effective tax rate (as a percent)	21.00%	21.00%	21.00%
State income taxes (as a percent)	5.00%	2.90%	2.60%
Tax-exempt interest income (as a percent)	(1.70%)	(1.90%)	(2.50%)
Excess compensation (as a percent)	1.10%
Change in tax law (as a percent)	(1.10%)
Income from bank-owned life insurance (as a percent)	(0.40%)	(0.60%)	(0.40%)
Investments in qualified housing projects (as a percent)	(0.30%)	(0.40%)	(0.40%)
Share-based compensation (as a percent)	(0.30%)	(0.50%)	(0.50%)
Merger related expenses	0.10%	0.40%
Other	(0.20%)	0.30%	0.30%
Income tax expense (as a percent)	23.20%	21.20%	20.10%

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