Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 7,255	$ 9,193
New TDRs		1,506
Disbursements (Payments)	(221)	(549)
Payoffs	(459)	(83)
TDR ending balance	6,575	10,067
TDR, Related Allowance	90	279
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	258	1,692
New TDRs		1,506
Disbursements (Payments)	(21)	(443)
TDR ending balance	237	2,755
TDR, Related Allowance		75
Impaired Nonaccrual Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		1,393
Disbursements (Payments)		(51)
TDR ending balance		1,342
TDR, Related Allowance		75
Impaired Nonaccrual Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New TDRs		1,506
Disbursements (Payments)		(373)
TDR ending balance		1,133
Impaired Nonaccrual Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	258	299
Disbursements (Payments)	(21)	(19)
TDR ending balance	237	280
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	6,997	7,501
Disbursements (Payments)	(200)	(106)
Payoffs	(459)	(83)
TDR ending balance	6,338	7,312
TDR, Related Allowance	90	204
Impaired Accruing Restructured Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,845	4,041
Disbursements (Payments)	(57)	(53)
Payoffs	(459)	(83)
TDR ending balance	3,329	3,905
TDR, Related Allowance	90	190
Impaired Accruing Restructured Loans [Member] \| Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,118	3,419
Disbursements (Payments)	(139)	(50)
TDR ending balance	2,979	3,369
TDR, Related Allowance		14
Impaired Accruing Restructured Loans [Member] \| Construction Loans [Member] \| Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	34	41
Disbursements (Payments)	(4)	(3)
TDR ending balance	$ 30	$ 38

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