Revenue from Contracts with Customers (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Service charges and fee income
Loan fees	$ 63,000	$ 45,000	$ 112,000	$ 105,000
Other fees	16,000	17,000	30,000	29,000
Service charges and fee income	429,000	479,000	923,000	925,000
Earnings on cash surrender value of bank-owned life insurance	90,000	78,000	105,000	186,000
Mortgage servicing income	235,000	256,000	479,000	498,000
Fair value adjustment on mortgage servicing rights	(437,000)	(162,000)	(800,000)	(486,000)
Net gain on sale of loans	1,262,000	204,000	1,581,000	695,000
Total noninterest income	1,579,000	855,000	2,288,000	1,818,000
Loss on sale of OREO	0	7,000	0	9,000
Account maintenance fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	45,000	45,000	139,000	96,000
Transaction-based and overdraft service charges
Service charges and fee income
Service charges and fee income within scope of ASC 606	58,000	115,000	158,000	219,000
Debit/ATM interchange fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	242,000	250,000	472,000	463,000
Credit card interchange fees
Service charges and fee income
Service charges and fee income within scope of ASC 606	$ 5,000	$ 7,000	$ 12,000	$ 13,000