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Loans and Allowance for Credit Losses (Composition of Nonaccrual Loans and Without an Allowance for Loan Loss by Portfolio Class) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | $ 60,357 | $ 139,879
Nonaccrual without allowance for loan loss | 16,598 | 25,127
Total Commercial [Member] | Commercial Real Estate - Income Producing [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 4,249 | 6,743
Nonaccrual without allowance for loan loss | 3,922 |
Total Commercial [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 1,238 | 2,486
Nonaccrual without allowance for loan loss |  | 1,116
Residential Mortgages [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 25,964 | 40,573
Nonaccrual without allowance for loan loss | 1,598 | 1,705
Consumer [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 12,238 | 23,385
Nonaccrual without allowance for loan loss | 250 |
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 16,668 | 66,692
Nonaccrual without allowance for loan loss | 10,828 | 22,306
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Non-Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 9,948 | 52,836
Nonaccrual without allowance for loan loss | 5,449 | 15,268
Total Commercial And Industrial [Member] | Total Commercial [Member] | Commercial Real Estate - Owner Occupied [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Nonaccrual | 6,720 | 13,856
Nonaccrual without allowance for loan loss | $ 5,379 | $ 7,038

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