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Loans and Allowance for Credit Losses (Troubled Debt Restructurings Modified by Portfolio Segment) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) contract	Dec. 31, 2019 USD ($) contract	Dec. 31, 2018 USD ($) contract
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	26	49	56
Pre-Modification Outstanding Recorded Investment	$ 4,570	$ 68,118	$ 94,760
Post-Modification Outstanding Recorded Investment	$ 4,570	$ 61,307	$ 94,760
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract		1	1
Pre-Modification Outstanding Recorded Investment		$ 123	$ 1,564
Post-Modification Outstanding Recorded Investment		$ 123	$ 1,564
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	3
Pre-Modification Outstanding Recorded Investment	$ 15	$ 323
Post-Modification Outstanding Recorded Investment	$ 15	$ 323
Residential Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	15	21	14
Pre-Modification Outstanding Recorded Investment	$ 3,424	$ 3,286	$ 1,297
Post-Modification Outstanding Recorded Investment	$ 3,424	$ 3,286	$ 1,297
Consumer Portfolio Segment
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	6	10	10
Pre-Modification Outstanding Recorded Investment	$ 89	$ 168	$ 455
Post-Modification Outstanding Recorded Investment	$ 89	$ 168	$ 455
Total Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	4	14	31
Pre-Modification Outstanding Recorded Investment	$ 1,042	$ 64,218	$ 91,444
Post-Modification Outstanding Recorded Investment	$ 1,042	$ 57,407	$ 91,444
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	3	13	29
Pre-Modification Outstanding Recorded Investment	$ 745	$ 64,051	$ 85,306
Post-Modification Outstanding Recorded Investment	$ 745	$ 57,240	$ 85,306
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate Owner Occupied
Financing Receivable, Modifications [Line Items]
Number of Contracts | contract	1	1	2
Pre-Modification Outstanding Recorded Investment	$ 297	$ 167	$ 6,138
Post-Modification Outstanding Recorded Investment	$ 297	$ 167	$ 6,138

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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.

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

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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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