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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	$ 16,845		$ 16,845		$ 20,150
Recorded investment with no allowance	13,528		13,528		13,354
Recorded investment with an allowance	2,078		2,078		6,063
Related allowance	237		237		975
Quarter-to-date average recorded investment	16,025	$ 21,753
Year-to-date average recorded investment			18,475	$ 22,713
Interest income recognized			196	237
Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	8,205		8,205		11,323
Recorded investment with no allowance	6,885		6,885		6,656
Recorded investment with an allowance	81		81		3,934
Related allowance	81		81		776
Quarter-to-date average recorded investment	7,465	13,173
Year-to-date average recorded investment			9,808	14,372
Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	7,267		7,267		7,501
Recorded investment with no allowance	5,270		5,270		5,372
Recorded investment with an allowance	1,997		1,997		2,129
Related allowance	156		156		199
Quarter-to-date average recorded investment	7,280	7,575
Year-to-date average recorded investment			7,357	7,755
Interest income recognized			192	232
Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,373		1,373		1,326
Recorded investment with no allowance	1,373		1,373		1,326
Quarter-to-date average recorded investment	1,280	1,005
Year-to-date average recorded investment			1,310	586
Interest income recognized			4	5
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	6,288		6,288		7,257
Recorded investment with no allowance	4,868		4,868		3,817
Recorded investment with an allowance	1,348		1,348		3,255
Related allowance	142		142		395
Quarter-to-date average recorded investment	6,581	7,067
Year-to-date average recorded investment			7,243	7,285
Interest income recognized			121	132
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	2,103		2,103		2,660
Recorded investment with no allowance	2,031		2,031		678
Recorded investment with an allowance					1,797
Related allowance					215
Quarter-to-date average recorded investment	2,306	2,642
Year-to-date average recorded investment			2,910	2,904
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,878		3,878		4,041
Recorded investment with no allowance	2,530		2,530		2,583
Recorded investment with an allowance	1,348		1,348		1,458
Related allowance	142		142		180
Quarter-to-date average recorded investment	3,886	4,052
Year-to-date average recorded investment			3,940	4,193
Interest income recognized			120	130
Residential Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	307		307		556
Recorded investment with no allowance	307		307		556
Quarter-to-date average recorded investment	389	373
Year-to-date average recorded investment			393	188
Interest income recognized			1	2
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	9,776		9,776		12,431
Recorded investment with no allowance	8,030		8,030		9,198
Recorded investment with an allowance	716		716		2,808
Related allowance	81		81		580
Quarter-to-date average recorded investment	8,685	14,215
Year-to-date average recorded investment			10,468	13,581
Interest income recognized			73	95
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	5,357		5,357		8,242
Recorded investment with no allowance	4,260		4,260		5,680
Recorded investment with an allowance	67		67		2,137
Related allowance	67		67		561
Quarter-to-date average recorded investment	4,498	10,221
Year-to-date average recorded investment			6,235	9,717
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	3,353		3,353		3,419
Recorded investment with no allowance	2,704		2,704		2,748
Recorded investment with an allowance	649		649		671
Related allowance	14		14		19
Quarter-to-date average recorded investment	3,357	3,479
Year-to-date average recorded investment			3,379	3,515
Interest income recognized			70	93
Commercial Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	1,066		1,066		770
Recorded investment with no allowance	1,066		1,066		770
Quarter-to-date average recorded investment	830	515
Year-to-date average recorded investment			854	349
Interest income recognized			3	2
Commercial Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	420		420		421
Recorded investment with no allowance	269		269		298
Recorded investment with an allowance	14		14
Related allowance	14		14
Quarter-to-date average recorded investment	397	353
Year-to-date average recorded investment			447	337
Interest income recognized				1
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	420		420		421
Recorded investment with no allowance	269		269		298
Recorded investment with an allowance	14		14
Related allowance	14		14
Quarter-to-date average recorded investment	355	310
Year-to-date average recorded investment			429	316
Commercial Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Quarter-to-date average recorded investment	42	43
Year-to-date average recorded investment			18	21
Interest income recognized				1
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	28		28
Recorded investment with no allowance	28		28
Quarter-to-date average recorded investment	28	2
Year-to-date average recorded investment			15	4
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	28		28
Recorded investment with no allowance	28		28
Quarter-to-date average recorded investment	9
Year-to-date average recorded investment			3
Consumer Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Quarter-to-date average recorded investment	19	2
Year-to-date average recorded investment			12	4
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Unpaid principal balance	333		333		41
Recorded investment with no allowance	333		333		41
Quarter-to-date average recorded investment	334	116
Year-to-date average recorded investment			302	1,506
Interest income recognized			2	9
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
Year-to-date average recorded investment			231	1,435
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	36		36		41
Recorded investment with no allowance	36		36		$ 41
Quarter-to-date average recorded investment	$ 37	44
Year-to-date average recorded investment			38	47
Interest income recognized			2	9
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Other Impaired Accruing Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Quarter-to-date average recorded investment		$ 72
Year-to-date average recorded investment			$ 33	$ 24

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