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Securities - Unrealized Loss Positions (Details)	3 Months Ended
	Mar. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)
Fair value
Less Than 12 Months, Fair Value	$ 118,273,000	$ 37,791,000
12 Months or More, Fair Value	0
Total Fair Value	118,273,000	37,791,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	2,314,000	204,000
12 Months or More, Unrealized Loss	0
Total Unrealized Loss	$ 2,314,000	204,000
Other information
Number of positions considered temporarily impaired | security	106
Debt securities considered temporarily impaired	$ 118,273,000	37,791,000
Other than temporary impairment	0
U.S. government agencies and corporations
Fair value
Less Than 12 Months, Fair Value	42,067,000	12,719,000
Total Fair Value	42,067,000	12,719,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	1,324,000	10,000
Total Unrealized Loss	1,324,000	10,000
Other information
Debt securities considered temporarily impaired	42,067,000	12,719,000
Mortgage-backed securities
Fair value
Less Than 12 Months, Fair Value	48,067,000	15,691,000
Total Fair Value	48,067,000	15,691,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	558,000	115,000
Total Unrealized Loss	558,000	115,000
Other information
Debt securities considered temporarily impaired	48,067,000	15,691,000
Obligations of states and political subdivisions
Fair value
Less Than 12 Months, Fair Value	21,881,000	5,110,000
Total Fair Value	21,881,000	5,110,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	370,000	36,000
Total Unrealized Loss	370,000	36,000
Other information
Debt securities considered temporarily impaired	21,881,000	5,110,000
Corporate and other debt securities
Fair value
Less Than 12 Months, Fair Value	6,258,000	4,271,000
Total Fair Value	6,258,000	4,271,000
Unrealized Loss
Less Than 12 Months, Unrealized Loss	62,000	43,000
Total Unrealized Loss	62,000	43,000
Other information
Debt securities considered temporarily impaired	$ 6,258,000	$ 4,271,000

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