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Income Taxes - Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amounts
Income tax at statutory rates	$ 5,026	$ 4,734	$ 6,288
State income taxes	695	575	348
Tax-exempt interest income	(476)	(592)	(1,162)
Carrying cost of tax-exempt assets	23	18	32
Share-based compensation	(126)	(103)	(284)
Income from bank-owned life insurance	(149)	(89)	(151)
Investments in qualified housing projects	(93)	(85)	(135)
Merger related expenses	96
Remeasurement of net deferred tax assets			6,643
Other	86	63	(185)
Income tax expense	$ 5,082	$ 4,521	$ 11,394
Percent of Pre-tax Income
Income tax at statutory rates (as a percent)	21.00%	21.00%	35.00%
State income taxes (as a percent)	2.90%	2.60%	1.90%
Tax-exempt interest income (as a percent)	(2.00%)	(2.60%)	(6.50%)
Carrying cost of tax-exempt assets (as a percent)	0.10%	0.10%	0.20%
Share-based compensation (as a percent)	(0.50%)	(0.50%)	(1.60%)
Income from bank-owned life insurance (as a percent)	(0.60%)	(0.40%)	(0.80%)
Investments in qualified housing projects (as a percent)	(0.40%)	(0.40%)	(0.80%)
Merger related expenses	0.40%
Remeasurement of net deferred tax assets (as a percent)			37.00%
Other	0.30%	0.30%	(1.00%)
Income tax expense (as a percent)	21.20%	20.10%	63.40%

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