Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 9,193	$ 11,781
New TDRs	1,506
Disbursements (Payments)	(549)	(2,053)
Charge offs		(3)
Payoffs	(83)	(197)
TDR ending balance	10,067	9,528
TDR, Related Allowance	279	414
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)	(443)	(1,355)
Charge offs		(3)
TDR ending balance	2,755	1,760
TDR, Related Allowance	75	159
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	299	320
Disbursements (Payments)	(19)	(9)
TDR ending balance	280	311
TDR, Related Allowance		7
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)		(1,346)
Charge offs		(3)
TDR ending balance		1,449
TDR, Related Allowance		152
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	7,501	8,663
Disbursements (Payments)	(106)	(698)
Payoffs	(83)	(197)
TDR ending balance	7,312	7,768
TDR, Related Allowance	204	255
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,041	4,454
Disbursements (Payments)	(53)	(45)
Payoffs	(83)	(197)
TDR ending balance	3,905	4,212
TDR, Related Allowance	190	230
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)	(50)	(647)
TDR ending balance	3,369	3,511
TDR, Related Allowance	14	25
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)	(3)	(6)
TDR ending balance	$ 38	$ 45