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Loans and Allowance for Credit Losses (Nonaccrual Loans and Without an Allowance for Loan Loss by Portfolio Class) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	$ 139,879	$ 245,833
Nonaccrual without allowance for loan loss	25,127	103,892
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	6,743	2,594
Total Commercial [Member] | Construction and Land Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	2,486	1,217
Nonaccrual without allowance for loan loss	1,116
Residential Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	40,573	39,262
Nonaccrual without allowance for loan loss	1,705	3,383
Consumer Portfolio Segment
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	23,385	16,374
Nonaccrual without allowance for loan loss		351
Total Commercial And Industrial [Member] | Total Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	66,692	186,386
Nonaccrual without allowance for loan loss	22,306	100,158
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	52,836	178,678
Nonaccrual without allowance for loan loss	15,268	97,700
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate Owner Occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Nonaccrual	13,856	7,708
Nonaccrual without allowance for loan loss	$ 7,038	$ 2,458

X

- Definition

Amount of financing receivable on nonaccrual status with no allowance for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
-Paragraph 16
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