Loans and Allowance for Credit Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract	Sep. 30, 2021 USD ($) contract	Sep. 30, 2020 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	7	10	25
Pre-Modification Outstanding Recorded Investment	$ 196	$ 1,383	$ 7,536	$ 4,273
Post-Modification Outstanding Recorded Investment	$ 196	$ 1,383	$ 7,559	$ 4,273
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract				1
Pre-Modification Outstanding Recorded Investment				$ 15
Post-Modification Outstanding Recorded Investment				$ 15
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	5	3	14
Pre-Modification Outstanding Recorded Investment	$ 196	$ 1,358	$ 515	$ 3,424
Post-Modification Outstanding Recorded Investment	$ 196	$ 1,358	$ 538	$ 3,424
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		2	4	7
Pre-Modification Outstanding Recorded Investment		$ 25	$ 86	$ 89
Post-Modification Outstanding Recorded Investment		$ 25	$ 86	$ 89
Total Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract			3	3
Pre-Modification Outstanding Recorded Investment			$ 6,935	$ 745
Post-Modification Outstanding Recorded Investment			$ 6,935	$ 745
Total Commercial And Industrial [Member] \| Total Commercial [Member] \| Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract			3	3
Pre-Modification Outstanding Recorded Investment			$ 6,935	$ 745
Post-Modification Outstanding Recorded Investment			$ 6,935	$ 745

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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