Securities - Unrealized Loss Positions (Details)	6 Months Ended
	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($)
Fair value
Less Than 12 Months, Fair Value	$ 15,732,000	$ 19,542,000
12 Months or More, Fair Value		15,628,000
Total Fair Value	15,732,000	35,170,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	19,000	71,000
12 Months or More, Unrealized Loss		48,000
Total Unrealized Loss	$ 19,000	119,000
Other information
Number of positions considered temporarily impaired | security	11
Debt securities considered temporarily impaired	$ 15,732,000	35,170,000
Other than temporary impairment	0
U.S. government agencies and corporations
Fair value
Less Than 12 Months, Fair Value	14,320,000	6,256,000
12 Months or More, Fair Value		4,094,000
Total Fair Value	14,320,000	10,350,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	16,000	11,000
12 Months or More, Unrealized Loss		6,000
Total Unrealized Loss	16,000	17,000
Other information
Debt securities considered temporarily impaired	14,320,000	10,350,000
Mortgage-backed securities
Fair value
Less Than 12 Months, Fair Value		4,099,000
12 Months or More, Fair Value		10,166,000
Total Fair Value		14,265,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss		7,000
12 Months or More, Unrealized Loss		36,000
Total Unrealized Loss		43,000
Other information
Debt securities considered temporarily impaired		14,265,000
Obligations of states and political subdivisions
Fair value
Less Than 12 Months, Fair Value	1,412,000	9,187,000
12 Months or More, Fair Value		1,368,000
Total Fair Value	1,412,000	10,555,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	3,000	53,000
12 Months or More, Unrealized Loss		6,000
Total Unrealized Loss	3,000	59,000
Other information
Debt securities considered temporarily impaired	$ 1,412,000	$ 10,555,000