Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 9,193	$ 11,781
New TDRs	1,506
Disbursements (Payments)	(437)	(676)
Payoffs		(197)
TDR ending balance	10,262	10,908
TDR, Related Allowance	286	492
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)	(380)	(38)
TDR ending balance	2,818	3,080
TDR, Related Allowance	94	291
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	1,393
Disbursements (Payments)	(26)
TDR ending balance	1,367
TDR, Related Allowance	94
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
New TDRs	1,506
Disbursements (Payments)	(344)
TDR ending balance	1,162
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	299	320
Disbursements (Payments)	(10)	(5)
TDR ending balance	289	315
TDR, Related Allowance		12
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)		(33)
TDR ending balance		2,765
TDR, Related Allowance		279
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	7,501	8,663
Disbursements (Payments)	(57)	(638)
Payoffs		(197)
TDR ending balance	7,444	7,828
TDR, Related Allowance	192	201
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)	(28)	(23)
Payoffs		(197)
TDR ending balance	4,013	4,234
TDR, Related Allowance	174	174
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)	(26)	(613)
TDR ending balance	3,393	3,545
TDR, Related Allowance	18	27
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)	(2)
TDR ending balance	$ 38	$ 49