Loans and Allowance For Credit Losses Loans (Summary of Analysis Of Allowance For Loan Losses Prior To ASC 326 (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 29,354	$ 13,074	$ 13,047
Financing Receivable, Allowance for Credit Loss, Writeoff	2,175	2,103
Financing Receivable, Allowance for Credit Loss, Recovery	711	580
Provision for Loan, Lease, and Other Losses	10,408	1,550
Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	2,875	1,221	1,705
Financing Receivable, Allowance for Credit Loss, Writeoff	99	281
Financing Receivable, Allowance for Credit Loss, Recovery	27	17
Provision for Loan, Lease, and Other Losses	662	(295)
Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			2,214
Financing Receivable, Allowance for Credit Loss, Writeoff		2
Financing Receivable, Allowance for Credit Loss, Recovery		21
Provision for Loan, Lease, and Other Losses		467
Non Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			5,742
Financing Receivable, Allowance for Credit Loss, Writeoff		170
Financing Receivable, Allowance for Credit Loss, Recovery		1
Provision for Loan, Lease, and Other Losses		366
Land and Land Improvements [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	4,216	600	339
Financing Receivable, Allowance for Credit Loss, Writeoff	4	2
Financing Receivable, Allowance for Credit Loss, Recovery	39	108
Provision for Loan, Lease, and Other Losses	1,334	155
Construction [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	3,388	242	64
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Provision for Loan, Lease, and Other Losses	2,150	178
Non-Jumbo [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			2,090
Financing Receivable, Allowance for Credit Loss, Writeoff		979
Financing Receivable, Allowance for Credit Loss, Recovery		125
Provision for Loan, Lease, and Other Losses		576
Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			379
Financing Receivable, Allowance for Credit Loss, Writeoff		0
Financing Receivable, Allowance for Credit Loss, Recovery		0
Provision for Loan, Lease, and Other Losses		(368)
Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	961	138	167
Financing Receivable, Allowance for Credit Loss, Writeoff	23	24
Financing Receivable, Allowance for Credit Loss, Recovery	39	19
Provision for Loan, Lease, and Other Losses	499	(24)
Mortgage Warehouse Lines [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	0	0	0
Financing Receivable, Allowance for Credit Loss, Writeoff	0	0
Financing Receivable, Allowance for Credit Loss, Recovery	0	0
Provision for Loan, Lease, and Other Losses	0	0
Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss	224	379	79
Financing Receivable, Allowance for Credit Loss, Writeoff	212	285
Financing Receivable, Allowance for Credit Loss, Recovery	101	168
Provision for Loan, Lease, and Other Losses	$ 194	173
Other Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss			$ 268
Financing Receivable, Allowance for Credit Loss, Writeoff		360
Financing Receivable, Allowance for Credit Loss, Recovery		121
Provision for Loan, Lease, and Other Losses		322
Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		13,074
Accounting Standards Update 2016-13 [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		1,146
Accounting Standards Update 2016-13 [Member] | Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		2,700
Accounting Standards Update 2016-13 [Member] | Non Owner Occupied [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		5,939
Accounting Standards Update 2016-13 [Member] | Land and Land Improvements [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		600
Accounting Standards Update 2016-13 [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		242
Accounting Standards Update 2016-13 [Member] | Non-Jumbo [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		1,812
Accounting Standards Update 2016-13 [Member] | Home Equity Line of Credit [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		11
Accounting Standards Update 2016-13 [Member] | Home Equity [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		138
Accounting Standards Update 2016-13 [Member] | Mortgage Warehouse Lines [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		0
Accounting Standards Update 2016-13 [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		135
Accounting Standards Update 2016-13 [Member] | Other Loans [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing Receivable, Allowance for Credit Loss		$ 351