Loans and Allowance for Credit Losses (Troubled Debt Restructurings Modified by Portfolio Class) (Details) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2021 USD ($) contract	Jun. 30, 2020 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	4	13	9	18
Pre-Modification Outstanding Recorded Investment	$ 141	$ 2,205	$ 7,340	$ 2,890
Post-Modification Outstanding Recorded Investment	$ 164	$ 2,205	$ 7,363	$ 2,890
Total Commercial [Member] \| Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		1		1
Pre-Modification Outstanding Recorded Investment		$ 15		$ 15
Post-Modification Outstanding Recorded Investment		$ 15		$ 15
Residential Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	1	8	2	9
Pre-Modification Outstanding Recorded Investment	$ 109	$ 1,810	$ 319	$ 2,066
Post-Modification Outstanding Recorded Investment	$ 132	$ 1,810	$ 342	$ 2,066
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract	3	2	4	5
Pre-Modification Outstanding Recorded Investment	$ 32	$ 30	$ 86	$ 64
Post-Modification Outstanding Recorded Investment	$ 32	$ 30	$ 86	$ 64
Total Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts \| contract		2	3	3
Pre-Modification Outstanding Recorded Investment		$ 350	$ 6,935	$ 745
Post-Modification Outstanding Recorded Investment		$ 350	$ 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		2	3	3
Pre-Modification Outstanding Recorded Investment		$ 350	$ 6,935	$ 745
Post-Modification Outstanding Recorded Investment		$ 350	$ 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=121611835&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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