Basis of Presentation and Changes in Significant Accounting Policies (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2020	Dec. 31, 2019
ACL for loans and leases	$ 300,000	$ 2,100,000	$ 8,000,000.0
Change in allowance for credit loss				$ 10,400,000
ACL on loans and leases	1,300,000	1,400,000	5,200,000
Reserve for unfunded commitments	980,000	$ 734,000	2,500,000
Retained earnings	228,825,000			228,825,000	$ 213,723,000
Goodwill	$ 18,600,000			$ 18,600,000
Accounting Standards Update 2016-13 | Revision of Prior Period, Adjustment [Member]
ACL on loans and leases			5,900,000
Reserve for unfunded commitments			1,700,000
ACL increase from non-accretable purchase accounting adjustments			$ 2,500,000
Retained earnings					(3,700,000)
Deferred tax assets					$ 1,400,000