Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($) Loan	Sep. 30, 2019 USD ($) Loan	Sep. 30, 2020 USD ($) Loan	Sep. 30, 2019 USD ($) Loan	Dec. 31, 2019 USD ($) Loan
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	6	5	40	28	35
Pre-Modification Outstanding Recorded Investment	$ 4,857		$ 16,070
Post-Modification Outstanding Balance	4,914	$ 302	16,042	$ 7,601	$ 9,076
Commitment to extend additional credit on loans modified in TDRs	$ 84		$ 84		82
Defaulted restructured loans, number of loans | Loan	0	2	3	2
Defaulted restructured loans, recorded balance	$ 0	$ 64	$ 368	$ 64
Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	4,857		13,726
Post-Modification Outstanding Balance	4,914	302	13,698	6,539	8,133
Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0		0	0
Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		2,344
Post-Modification Outstanding Balance	$ 0	$ 0	$ 2,344	$ 1,062	$ 943
Commercial [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	5		37
Pre-Modification Outstanding Recorded Investment	$ 4,574		$ 14,854
Post-Modification Outstanding Balance	4,632		14,839
Commercial [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	4,574		12,510
Post-Modification Outstanding Balance	4,632		12,495
Commercial [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		2,344
Post-Modification Outstanding Balance	$ 0		$ 2,344
Commercial [Member] | Commercial Real Estate Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1		12
Pre-Modification Outstanding Recorded Investment	$ 101		$ 6,503
Post-Modification Outstanding Balance	$ 101		$ 6,505
Defaulted restructured loans, number of loans | Loan	0	1	0	1
Defaulted restructured loans, recorded balance	$ 0	$ 30	$ 0	$ 30
Commercial [Member] | Commercial Real Estate Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	101		4,694
Post-Modification Outstanding Balance	101		4,696
Commercial [Member] | Commercial Real Estate Residential [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		1,809
Post-Modification Outstanding Balance	$ 0		$ 1,809
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	3		15
Pre-Modification Outstanding Recorded Investment	$ 4,421		$ 7,695
Post-Modification Outstanding Balance	4,479		7,744
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	4,421		7,185
Post-Modification Outstanding Balance	4,479		7,234
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		510
Post-Modification Outstanding Balance	$ 0		$ 510
Commercial [Member] | Commercial Other [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1	2	10	13	17
Pre-Modification Outstanding Recorded Investment	$ 52		$ 656
Post-Modification Outstanding Balance	$ 52	$ 32	$ 590	$ 1,432	$ 1,829
Defaulted restructured loans, number of loans | Loan	0	1	3	1
Defaulted restructured loans, recorded balance	$ 0	$ 34	$ 368	$ 34
Commercial [Member] | Commercial Other [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	52		631
Post-Modification Outstanding Balance	52	32	565	1,292	1,565
Commercial [Member] | Commercial Other [Member] | Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0		0	0
Commercial [Member] | Commercial Other [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		25
Post-Modification Outstanding Balance	$ 0	$ 0	$ 25	$ 140	$ 264
Commercial [Member] | Real Estate Mortgage [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan		3		13	17
Post-Modification Outstanding Balance		$ 270		$ 5,463	$ 6,784
Commercial [Member] | Real Estate Mortgage [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		270		4,784	6,105
Commercial [Member] | Real Estate Mortgage [Member] | Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0		0	0
Commercial [Member] | Real Estate Mortgage [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		$ 0		$ 679	$ 679
Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1		3
Pre-Modification Outstanding Recorded Investment	$ 283		$ 1,216
Post-Modification Outstanding Balance	282		1,203
Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	283		1,216
Post-Modification Outstanding Balance	282		1,203
Residential [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		0
Post-Modification Outstanding Balance	$ 0		$ 0
Residential [Member] | Real Estate Mortgage [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1		3	2	1
Pre-Modification Outstanding Recorded Investment	$ 283		$ 1,216
Post-Modification Outstanding Balance	282		1,203	$ 706	$ 463
Residential [Member] | Real Estate Mortgage [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	283		1,216
Post-Modification Outstanding Balance	282		1,203	463	463
Residential [Member] | Real Estate Mortgage [Member] | Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance				0	0
Residential [Member] | Real Estate Mortgage [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		0
Post-Modification Outstanding Balance	$ 0		$ 0	$ 243	$ 0