Segment Reporting - Segment information (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segment	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			2
Revenues
Interest income	$ 6,731,000	$ 6,972,000	$ 12,999,000	$ 14,003,000
Gain on sale of loans	1,458,000	2,729,000	2,668,000	6,904,000
Other revenues	975,000	926,000	1,844,000	1,787,000
Total revenues	9,164,000	10,627,000	17,511,000	22,694,000
Expenses
Recovery of provision for loan losses		(500,000)	(400,000)	(500,000)
Interest expense	410,000	580,000	818,000	1,235,000
Salaries and benefits	3,423,000	3,512,000	6,947,000	6,933,000
Commissions	490,000	890,000	946,000	1,668,000
Other expenses	2,096,000	1,948,000	4,248,000	4,128,000
Total operating expenses	6,419,000	6,430,000	12,559,000	13,464,000
Income (loss) before income taxes	2,745,000	4,197,000	4,952,000	9,230,000
Income tax expense (benefit)	555,000	903,000	962,000	2,039,000
Net income (loss)	2,190,000	3,294,000	3,990,000	7,191,000
Total assets	752,597,000	717,932,000	752,597,000	717,932,000	$ 748,401,000
Eliminations [Member]
Revenues
Interest income				(23,000)
Gain on sale of loans			0	0
Other revenues	(72,000)	(45,000)	(148,000)	(135,000)
Total revenues	(72,000)	(45,000)	(148,000)	(158,000)
Expenses
Recovery of provision for loan losses			0	0
Interest expense				(23,000)
Salaries and benefits			0	0
Commissions			0	0
Other expenses	(72,000)	(45,000)	(148,000)	(135,000)
Total operating expenses	(72,000)	(45,000)	(148,000)	(158,000)
Income (loss) before income taxes			0	0
Income tax expense (benefit)			0	0
Net income (loss)			0	0
Total assets	(28,012,000)	(19,427,000)	(28,012,000)	(19,427,000)
Commercial Banking
Revenues
Interest income	6,653,000	6,870,000	12,878,000	13,789,000
Gain on sale of loans			0	0
Other revenues	893,000	733,000	1,687,000	1,456,000
Total revenues	7,546,000	7,603,000	14,565,000	15,245,000
Expenses
Recovery of provision for loan losses		(500,000)	(400,000)	(500,000)
Interest expense	410,000	580,000	818,000	1,235,000
Salaries and benefits	2,608,000	2,496,000	5,253,000	4,641,000
Commissions			0	0
Other expenses	1,851,000	1,791,000	3,758,000	3,635,000
Total operating expenses	4,869,000	4,367,000	9,429,000	9,011,000
Income (loss) before income taxes	2,677,000	3,236,000	5,136,000	6,234,000
Income tax expense (benefit)	540,000	701,000	1,000,000	1,410,000
Net income (loss)	2,137,000	2,535,000	4,136,000	4,824,000
Total assets	761,749,000	717,993,000	761,749,000	717,993,000
Mortgage Banking
Revenues
Interest income	78,000	102,000	121,000	237,000
Gain on sale of loans	1,458,000	2,729,000	2,668,000	6,904,000
Other revenues	154,000	238,000	305,000	466,000
Total revenues	1,690,000	3,069,000	3,094,000	7,607,000
Expenses
Recovery of provision for loan losses			0	0
Interest expense				23,000
Salaries and benefits	815,000	1,016,000	1,694,000	2,292,000
Commissions	490,000	890,000	946,000	1,668,000
Other expenses	317,000	202,000	638,000	628,000
Total operating expenses	1,622,000	2,108,000	3,278,000	4,611,000
Income (loss) before income taxes	68,000	961,000	(184,000)	2,996,000
Income tax expense (benefit)	15,000	202,000	(38,000)	629,000
Net income (loss)	53,000	759,000	(146,000)	2,367,000
Total assets	$ 18,860,000	$ 19,366,000	$ 18,860,000	$ 19,366,000