Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 9,193	$ 11,781
New TDRs	1,506	41
Disbursements (Payments)	(710)	(2,273)
Charge offs		(3)
Payoffs	(2,734)	(353)
TDR ending balance	7,255	9,193
TDR, Related Allowance	146	312
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	1,692	3,118
New TDRs	1,506
Disbursements (Payments)	(493)	(1,423)
Charge offs		(3)
Payoffs	(2,447)
TDR ending balance	258	1,692
TDR, Related Allowance		113
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	1,393
Disbursements (Payments)	(51)
Reclassifications/Transfer In/(Out)		1,393
Payoffs	(1,342)
TDR ending balance		1,393
TDR, Related Allowance		113
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New TDRs	1,506
Disbursements (Payments)	(401)
Payoffs	(1,105)
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	299	320
Disbursements (Payments)	(41)	(21)
TDR ending balance	258	299
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		2,798
Disbursements (Payments)		(1,402)
Charge offs		(3)
Reclassifications/Transfer In/(Out)		(1,393)
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	7,501	8,663
New TDRs		41
Disbursements (Payments)	(217)	(850)
Payoffs	(287)	(353)
TDR ending balance	6,997	7,501
TDR, Related Allowance	146	199
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,041	4,454
New TDRs		41
Disbursements (Payments)	(113)	(101)
Payoffs	(83)	(353)
TDR ending balance	3,845	4,041
TDR, Related Allowance	135	180
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,419	4,158
Disbursements (Payments)	(97)	(739)
Payoffs	(204)
TDR ending balance	3,118	3,419
TDR, Related Allowance	11	19
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	41	51
Disbursements (Payments)	(7)	(10)
TDR ending balance	$ 34	$ 41