Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 7,255	$ 9,193
New TDRs		1,506
Disbursements (Payments)	(378)	(633)
Payoffs	(900)	(1,425)
TDR ending balance	5,977	8,641
TDR, Related Allowance	84	156
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	258	1,692
New TDRs		1,506
Disbursements (Payments)	(31)	(482)
Payoffs		(1,342)
TDR ending balance	227	1,374
Impaired Nonaccrual Loans [Member] \| Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		1,393
Disbursements (Payments)		(51)
Payoffs		(1,342)
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)
TDR ending balance		1,105
Impaired Nonaccrual Loans [Member] \| Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	258	299
Disbursements (Payments)	(31)	(30)
TDR ending balance	227	269
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	6,997	7,501
Disbursements (Payments)	(347)	(151)
Payoffs	(900)	(83)
TDR ending balance	5,750	7,267
TDR, Related Allowance	84	156
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)	(82)	(80)
Payoffs	(900)	(83)
TDR ending balance	2,863	3,878
TDR, Related Allowance	84	142
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)	(258)	(66)
TDR ending balance	2,860	3,353
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)	(7)	(5)
TDR ending balance	$ 27	$ 36

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- Definition

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