Loans, Troubled Debt Restructurings Segregated by Class (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020 USD ($) Loan	Mar. 31, 2019 USD ($) Loan	Dec. 31, 2019 USD ($) Loan
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	23	13	35
Pre-Modification Outstanding Recorded Investment	$ 7,594
Post-Modification Outstanding Balance	7,522	$ 3,195	$ 9,076
Commitment to extend additional credit on loans modified in TDRs	$ 95		$ 82
Defaulted restructured loans, number of loans | Loan	3		3
Defaulted restructured loans, recorded balance	$ 3,805		$ 527
Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	7,594
Post-Modification Outstanding Balance	$ 7,522	2,413	8,133
Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0	0
Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		$ 782	$ 943
Commercial [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	22
Pre-Modification Outstanding Recorded Investment	$ 7,206
Post-Modification Outstanding Balance	7,134
Commercial [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	7,206
Post-Modification Outstanding Balance	$ 7,134
Commercial [Member] | Commercial Real Estate Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	8
Pre-Modification Outstanding Recorded Investment	$ 4,397
Post-Modification Outstanding Balance	4,399
Commercial [Member] | Commercial Real Estate Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	4,397
Post-Modification Outstanding Balance	$ 4,399
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	9
Pre-Modification Outstanding Recorded Investment	$ 2,345
Post-Modification Outstanding Balance	$ 2,336
Defaulted restructured loans, number of loans | Loan	1
Defaulted restructured loans, recorded balance	$ 3,532
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	2,345
Post-Modification Outstanding Balance	$ 2,336
Commercial [Member] | Commercial Other [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	5	7	17
Pre-Modification Outstanding Recorded Investment	$ 464
Post-Modification Outstanding Balance	$ 399	$ 1,262	$ 1,829
Defaulted restructured loans, number of loans | Loan	2		1
Defaulted restructured loans, recorded balance	$ 273		$ 34
Commercial [Member] | Commercial Other [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	464
Post-Modification Outstanding Balance	$ 399	1,122	1,565
Commercial [Member] | Commercial Other [Member] | Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0	0
Commercial [Member] | Commercial Other [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		$ 140	$ 264
Commercial [Member] | Real Estate Mortgage [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan		5	17
Post-Modification Outstanding Balance		$ 1,470	$ 6,784
Defaulted restructured loans, number of loans | Loan			1
Defaulted restructured loans, recorded balance			$ 30
Commercial [Member] | Real Estate Mortgage [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		828	6,105
Commercial [Member] | Real Estate Mortgage [Member] | Rate Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		0	0
Commercial [Member] | Real Estate Mortgage [Member] | Combination [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Post-Modification Outstanding Balance		$ 642	$ 679
Residential [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1
Pre-Modification Outstanding Recorded Investment	$ 388
Post-Modification Outstanding Balance	388
Residential [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	388
Post-Modification Outstanding Balance	$ 388
Residential [Member] | Real Estate Mortgage [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Number of Loans | Loan	1	1	1
Pre-Modification Outstanding Recorded Investment	$ 388
Post-Modification Outstanding Balance	388	$ 463	$ 463
Defaulted restructured loans, number of loans | Loan			1
Defaulted restructured loans, recorded balance			$ 463
Residential [Member] | Real Estate Mortgage [Member] | Term Modification [Member]
Troubled Debt Restructurings Segregated by Class [Abstract]
Pre-Modification Outstanding Recorded Investment	388
Post-Modification Outstanding Balance	$ 388	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]
Post-Modification Outstanding Balance		$ 0	$ 0