Disclosures About Fair Value of Financial Instruments - Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)	Dec. 31, 2021	Dec. 31, 2020
Agency mortgage-backed securities.
Recurring Assets, Fair Value Disclosure	$ 229,441,000	$ 169,940,000
Agency collateralized mortgage obligations
Recurring Assets, Fair Value Disclosure	204,277,000	176,621,000
States and political subdivisions securities
Recurring Assets, Fair Value Disclosure	40,015,000	47,325,000
Small Business Administration securities
Recurring Assets, Fair Value Disclosure	27,299,000	21,047,000
Interest rate derivative asset
Recurring Assets, Fair Value Disclosure	2,816,000	5,062,000
Interest rate derivative liability
Recurring Assets, Fair Value Disclosure	(2,895,000)	(5,454,000)
Fair Value, Inputs, Level 1
Securities at fair value	0
Fair Value, Inputs, Level 2 | Agency mortgage-backed securities.
Recurring Assets, Fair Value Disclosure	229,441,000	169,940,000
Fair Value, Inputs, Level 2 | Agency collateralized mortgage obligations
Recurring Assets, Fair Value Disclosure	204,277,000	176,621,000
Fair Value, Inputs, Level 2 | States and political subdivisions securities
Recurring Assets, Fair Value Disclosure	40,015,000	47,325,000
Fair Value, Inputs, Level 2 | Small Business Administration securities
Recurring Assets, Fair Value Disclosure	27,299,000	21,047,000
Fair Value, Inputs, Level 2 | Interest rate derivative asset
Recurring Assets, Fair Value Disclosure	2,816,000	5,062,000
Fair Value, Inputs, Level 2 | Interest rate derivative liability
Recurring Assets, Fair Value Disclosure	(2,895,000)	$ (5,454,000)
Fair Value, Inputs, Level 3
Securities at fair value	$ 0