Segment Reporting - Segment information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	2
Revenues
Interest income	$ 27,667,000	$ 25,826,000
Gain on sale of loans	11,762,000	11,703,000
Other revenues	3,584,000	3,854,000
Total revenues	43,013,000	41,383,000
Expenses
Provision for loan losses	(500,000)	950,000
Interest expense	2,172,000	4,433,000
Salaries and benefits	14,105,000	12,920,000
Commissions	3,004,000	3,312,000
Other expenses	8,359,000	8,729,000
Total operating expenses	27,140,000	30,344,000
Income before income taxes	15,873,000	11,039,000
Income tax expense	3,420,000	2,485,000
Net income	12,453,000	8,554,000
Total assets	748,401,000	706,236,000
Eliminations [Member]
Revenues
Interest income	(24,000)	(159,000)
Gain on sale of loans	0	0
Other revenues	(281,000)	(242,000)
Total revenues	(305,000)	(401,000)
Expenses
Provision for loan losses	0	0
Interest expense	(24,000)	(159,000)
Salaries and benefits	0	0
Commissions	0	0
Other expenses	(281,000)	(242,000)
Total operating expenses	(305,000)	(401,000)
Income before income taxes	0	0
Income tax expense	0	0
Net income	0	0
Total assets	(31,925,000)	(16,626,000)
Mortgage Banking [Member]
Revenues
Interest income	409,000	581,000
Gain on sale of loans	11,762,000	11,703,000
Other revenues	864,000	1,408,000
Total revenues	13,035,000	13,692,000
Expenses
Provision for loan losses	0	0
Interest expense	24,000	159,000
Salaries and benefits	4,163,000	4,053,000
Commissions	3,004,000	3,312,000
Other expenses	1,326,000	1,187,000
Total operating expenses	8,517,000	8,711,000
Income before income taxes	4,518,000	4,981,000
Income tax expense	949,000	1,046,000
Net income	3,569,000	3,935,000
Total assets	19,673,000	18,604,000
Commercial Banking [Member]
Revenues
Interest income	27,282,000	25,404,000
Gain on sale of loans	0	0
Other revenues	3,001,000	2,688,000
Total revenues	30,283,000	28,092,000
Expenses
Provision for loan losses	(500,000)	950,000
Interest expense	2,172,000	4,433,000
Salaries and benefits	9,942,000	8,867,000
Commissions	0	0
Other expenses	7,314,000	7,784,000
Total operating expenses	18,928,000	22,034,000
Income before income taxes	11,355,000	6,058,000
Income tax expense	2,471,000	1,439,000
Net income	8,884,000	4,619,000
Total assets	$ 760,653,000	$ 704,258,000