Loans and Allowance for Credit Losses (Rollforward of TDRs) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	$ 11,781	$ 16,624
Disbursements (Payments)	(2,053)	(161)
Charge offs	(3)	(379)
Payoffs	(197)	(3,056)
TDR ending balance	9,528	13,028
TDR, Related Allowance	414	421
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	3,118	3,298
Disbursements (Payments)	(1,355)	(44)
Charge offs	(3)
Reclassifications/Transfer In/(Out)		154
TDR ending balance	1,760	3,408
TDR, Related Allowance	159	421
Impaired Nonaccrual Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassifications/Transfer In/(Out)		154
TDR ending balance		154
Impaired Nonaccrual Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance		83
TDR ending balance		83
Impaired Nonaccrual Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	320	337
Disbursements (Payments)	(9)	(4)
TDR ending balance	311	333
TDR, Related Allowance	7	29
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	2,878
Disbursements (Payments)	(1,346)	(40)
Charge offs	(3)
TDR ending balance	1,449	2,838
TDR, Related Allowance	152	392
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	8,663	13,326
Disbursements (Payments)	(698)	(117)
Charge offs		(379)
Reclassifications/Transfer In/(Out)		(154)
Payoffs	(197)	(3,056)
TDR ending balance	7,768	9,620
TDR, Related Allowance	255
Impaired Accruing Restructured Loans [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,454	4,536
Disbursements (Payments)	(45)	(42)
Reclassifications/Transfer In/(Out)		(154)
Payoffs	(197)	(237)
TDR ending balance	4,212	4,103
TDR, Related Allowance	230
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
TDR beginning balance	4,158	4,818
Disbursements (Payments)	(647)	(69)
Payoffs		(219)
TDR ending balance	3,511	4,530
TDR, Related Allowance	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	51	3,972
Disbursements (Payments)	(6)	(6)
Charge offs		(379)
Payoffs		(2,600)
TDR ending balance	$ 45	$ 987