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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

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