Segment Reporting - Segment information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segment	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment			2
Revenues
Interest income	$ 6,955,000	$ 6,921,000	$ 19,954,000	$ 20,923,000
Gain on sale of loans	1,350,000	2,704,000	4,018,000	9,608,000
Other revenues	859,000	891,000	2,775,000	2,679,000
Total revenues	9,164,000	10,516,000	26,747,000	33,210,000
Expenses
Recovery of provision for loan losses	100,000		(300,000)	(500,000)
Interest expense	420,000	492,000	1,238,000	1,728,000
Salaries and benefits	3,446,000	3,607,000	10,394,000	10,541,000
Commissions	459,000	736,000	1,405,000	2,405,000
Other expenses	2,078,000	2,030,000	6,397,000	6,156,000
Total operating expenses	6,503,000	6,865,000	19,134,000	20,330,000
Income (loss) before income taxes	2,661,000	3,651,000	7,613,000	12,880,000
Income tax expense (benefit)	508,000	752,000	1,470,000	2,790,000
Net income (loss)	2,153,000	2,899,000	6,143,000	10,090,000
Total assets	742,703,000	730,061,000	742,703,000	730,061,000	$ 748,401,000
Eliminations [Member]
Revenues
Interest income		(1,000)		(24,000)
Gain on sale of loans			0	0
Other revenues	(71,000)	(70,000)	(148,000)	(205,000)
Total revenues	(71,000)	(71,000)	(148,000)	(229,000)
Expenses
Recovery of provision for loan losses			0	0
Interest expense		(1,000)		(24,000)
Salaries and benefits			0	0
Commissions			0	0
Other expenses	(71,000)	(70,000)	(148,000)	(205,000)
Total operating expenses	(71,000)	(71,000)	(148,000)	(229,000)
Income (loss) before income taxes			0	0
Income tax expense (benefit)			0	0
Net income (loss)			0	0
Total assets	(30,649,000)	(22,967,000)	(30,649,000)	(22,967,000)
Commercial Banking
Revenues
Interest income	6,885,000	6,818,000	19,762,000	20,606,000
Gain on sale of loans			0	0
Other revenues	822,000	733,000	2,510,000	2,190,000
Total revenues	7,707,000	7,551,000	22,272,000	22,796,000
Expenses
Recovery of provision for loan losses	100,000		(300,000)	(500,000)
Interest expense	420,000	493,000	1,238,000	1,728,000
Salaries and benefits	2,646,000	2,632,000	7,900,000	7,274,000
Commissions			0	0
Other expenses	1,853,000	1,738,000	5,610,000	5,372,000
Total operating expenses	5,019,000	4,863,000	14,448,000	13,874,000
Income (loss) before income taxes	2,688,000	2,688,000	7,824,000	8,922,000
Income tax expense (benefit)	514,000	550,000	1,514,000	1,959,000
Net income (loss)	2,174,000	2,138,000	6,310,000	6,963,000
Total assets	755,071,000	733,611,000	755,071,000	733,611,000
Mortgage Banking
Revenues
Interest income	70,000	104,000	192,000	341,000
Gain on sale of loans	1,350,000	2,704,000	4,018,000	9,608,000
Other revenues	108,000	228,000	413,000	694,000
Total revenues	1,528,000	3,036,000	4,623,000	10,643,000
Expenses
Recovery of provision for loan losses			0	0
Interest expense				24,000
Salaries and benefits	800,000	975,000	2,494,000	3,267,000
Commissions	459,000	736,000	1,405,000	2,405,000
Other expenses	296,000	362,000	935,000	989,000
Total operating expenses	1,555,000	2,073,000	4,834,000	6,685,000
Income (loss) before income taxes	(27,000)	963,000	(211,000)	3,958,000
Income tax expense (benefit)	(6,000)	202,000	(44,000)	831,000
Net income (loss)	(21,000)	761,000	(167,000)	3,127,000
Total assets	$ 18,281,000	$ 19,417,000	$ 18,281,000	$ 19,417,000