Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Service charges and fee income
Loan fees	$ 72,000	$ 59,000	$ 183,000	$ 163,000
Other fees	15,000	16,000	46,000	44,000
Service charges and fee income	510,000	512,000	1,433,000	1,437,000
Earnings on cash surrender value of bank-owned life insurance	102,000	81,000	207,000	267,000
Mortgage servicing income	260,000	259,000	739,000	756,000
Fair value adjustment on mortgage servicing rights	(623,000)	(90,000)	(1,423,000)	(576,000)
Net gain on sale of loans	1,819,000	305,000	3,399,000	1,000,000
Total noninterest income	2,068,000	1,067,000	4,355,000	2,884,000
Loss on sale of OREO	0	1,000	0	11,000
Account maintenance fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	74,000	48,000	209,000	143,000
Transaction-based and overdraft service charges
Service charges and fee income
Service charges and fee income within scope of ASC 606	74,000	118,000	235,000	338,000
Debit/ATM interchange fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	270,000	264,000	742,000	728,000
Credit card interchange fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	$ 5,000	$ 7,000	$ 18,000	$ 21,000