Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 21,158		$ 21,158		$ 20,150
Recorded investment with no allowance	14,793		14,793		13,354
Recorded investment with an allowance	4,772		4,772		6,063
Related allowance	346		346		975
Quarter-to-date average recorded investment	19,833	$ 22,591
Year-to-date average recorded investment			19,699	$ 23,192
Interest income recognized			131	157
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	13,242		13,242		11,323
Recorded investment with no allowance	10,240		10,240		6,656
Recorded investment with an allowance	1,409		1,409		3,934
Related allowance	142		142		776
Quarter-to-date average recorded investment	11,256	14,172
Year-to-date average recorded investment			10,980	14,972
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	7,312		7,312		7,501
Recorded investment with no allowance	3,949		3,949		5,372
Recorded investment with an allowance	3,363		3,363		2,129
Related allowance	204		204		199
Quarter-to-date average recorded investment	7,323	7,782
Year-to-date average recorded investment			7,395	7,844
Interest income recognized			127	155
Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	604		604		1,326
Recorded investment with no allowance	604		604		1,326
Quarter-to-date average recorded investment	1,254	637
Year-to-date average recorded investment			1,324	376
Interest income recognized			4	2
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,209		8,209		7,257
Recorded investment with no allowance	3,727		3,727		3,817
Recorded investment with an allowance	4,048		4,048		3,255
Related allowance	265		265		395
Quarter-to-date average recorded investment	7,646	7,037
Year-to-date average recorded investment			7,574	7,392
Interest income recognized			80	81
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	4,250		4,250		2,660
Recorded investment with no allowance	2,474		2,474		678
Recorded investment with an allowance	1,342		1,342		1,797
Related allowance	75		75		215
Quarter-to-date average recorded investment	3,555	2,730
Year-to-date average recorded investment			3,213	3,034
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,905		3,905		4,041
Recorded investment with no allowance	1,199		1,199		2,583
Recorded investment with an allowance	2,706		2,706		1,458
Related allowance	190		190		180
Quarter-to-date average recorded investment	3,912	4,219
Year-to-date average recorded investment			3,967	4,263
Interest income recognized			79	81
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	54		54		556
Recorded investment with no allowance	54		54		556
Quarter-to-date average recorded investment	179	88
Year-to-date average recorded investment			394	95
Interest income recognized			1
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	11,912		11,912		12,431
Recorded investment with no allowance	10,160		10,160		9,198
Recorded investment with an allowance	724		724		2,808
Related allowance	81		81		580
Quarter-to-date average recorded investment	11,279	13,660
Year-to-date average recorded investment			11,360	13,265
Interest income recognized			50	68
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,016		8,016		8,242
Recorded investment with no allowance	6,921		6,921		5,680
Recorded investment with an allowance	67		67		2,137
Related allowance	67		67		561
Quarter-to-date average recorded investment	6,853	9,613
Year-to-date average recorded investment			7,103	9,466
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,369		3,369		3,419
Recorded investment with no allowance	2,712		2,712		2,748
Recorded investment with an allowance	657		657		671
Related allowance	14		14		19
Quarter-to-date average recorded investment	3,373	3,516
Year-to-date average recorded investment			3,390	3,533
Interest income recognized			47	66
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	527		527		770
Recorded investment with no allowance	527		527		770
Quarter-to-date average recorded investment	1,053	531
Year-to-date average recorded investment			867	266
Interest income recognized			3	2
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	702		702		421
Recorded investment with no allowance	571		571		298
Quarter-to-date average recorded investment	557	325
Year-to-date average recorded investment			471	329
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	679		679		421
Recorded investment with no allowance	548		548		298
Quarter-to-date average recorded investment	551	314
Year-to-date average recorded investment			466	319
Commercial Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	23		23
Recorded investment with no allowance	23		23
Quarter-to-date average recorded investment	6	11
Year-to-date average recorded investment			5	10
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Quarter-to-date average recorded investment	16	7
Year-to-date average recorded investment			9	5
Consumer Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Quarter-to-date average recorded investment	16	7
Year-to-date average recorded investment			9	5
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	335		335		41
Recorded investment with no allowance	335		335		41
Quarter-to-date average recorded investment	335	1,562
Year-to-date average recorded investment			285	2,201
Interest income recognized			1	8
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	297		297
Recorded investment with no allowance	297		297
Quarter-to-date average recorded investment	297	1,515
Year-to-date average recorded investment			198	2,153
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	38		38		41
Recorded investment with no allowance	38		38		$ 41
Quarter-to-date average recorded investment	$ 38	$ 47
Year-to-date average recorded investment			38	48
Interest income recognized			1	$ 8
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Year-to-date average recorded investment			$ 49