Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021 USD ($) Loan	Mar. 31, 2020 USD ($) Loan	Dec. 31, 2020 USD ($) Loan
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1	23	47
Pre-Modification Outstanding Recorded Investment	$ 284	$ 7,594	$ 17,879
Post-Modification Outstanding Balance	284	7,522	17,850
Commitment to extend additional credit on loans modified in TDRs	88		$ 85
Defaulted restructured loans, number of loans | Loan			3
Defaulted restructured loans, recorded balance			$ 368
Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	7,594	15,235
Post-Modification Outstanding Balance	0	$ 7,522	15,208
Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	284		2,644
Post-Modification Outstanding Balance	$ 284		$ 2,642
Commercial [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1	22	43
Pre-Modification Outstanding Recorded Investment	$ 284	$ 7,206	$ 16,383
Post-Modification Outstanding Balance	284	7,134	16,371
Commercial [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	7,206	13,739
Post-Modification Outstanding Balance	0	$ 7,134	13,729
Commercial [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	284		2,644
Post-Modification Outstanding Balance	$ 284		$ 2,642
Commercial [Member] | Hotel/Motel [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 1,113
Post-Modification Outstanding Balance	0	0	1,113
Commercial [Member] | Hotel/Motel [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	0	1,113
Post-Modification Outstanding Balance	0	$ 0	1,113
Commercial [Member] | Hotel/Motel [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		0
Post-Modification Outstanding Balance	$ 0		$ 0
Commercial [Member] | Commercial Real Estate Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	0	8	12
Pre-Modification Outstanding Recorded Investment	$ 0	$ 4,397	$ 6,503
Post-Modification Outstanding Balance	0	4,399	6,505
Commercial [Member] | Commercial Real Estate Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	4,397	4,694
Post-Modification Outstanding Balance	0	$ 4,399	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	1	9	18
Pre-Modification Outstanding Recorded Investment	$ 284	$ 2,345	$ 8,077
Post-Modification Outstanding Balance	284	2,336	8,131
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	2,345	7,295
Post-Modification Outstanding Balance	0	$ 2,336	7,349
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	284		782
Post-Modification Outstanding Balance	$ 284		$ 782
Commercial [Member] | Commercial Other [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	0	5	12
Pre-Modification Outstanding Recorded Investment	$ 0	$ 464	$ 690
Post-Modification Outstanding Balance	0	399	$ 622
Defaulted restructured loans, number of loans | Loan			3
Defaulted restructured loans, recorded balance			$ 368
Commercial [Member] | Commercial Other [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	464	637
Post-Modification Outstanding Balance	0	$ 399	571
Commercial [Member] | Commercial Other [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0		53
Post-Modification Outstanding Balance	$ 0		$ 51
Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	0	1	4
Pre-Modification Outstanding Recorded Investment	$ 0	$ 388	$ 1,496
Post-Modification Outstanding Balance	0	388	1,479
Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	388	1,496
Post-Modification Outstanding Balance	0	$ 388	1,479
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	0	1	4
Pre-Modification Outstanding Recorded Investment	$ 0	$ 388	$ 1,496
Post-Modification Outstanding Balance	0	388	1,479
Residential [Member] | Real Estate Mortgage [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	0	388	1,496
Post-Modification Outstanding Balance	0	$ 388	1,479
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