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Loans and Allowance for Credit Losses (Loans, Net of Unearned Income) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
--- | --- | --- | ---
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | $ 20,886,015 | $ 21,789,931 | $ 22,240,204
Residential Mortgages [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 2,351,053 | 2,665,212 | 2,754,388
Consumer [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 1,623,116 | 1,857,295 | 1,945,918
Commercial Real Estate - Income Producing [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 3,467,939 | 3,357,939 | 3,406,554
Construction and Land Development [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 1,213,991 | 1,065,057 | 1,096,149
Total Commercial And Industrial [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 12,229,916 | 12,844,428 | 13,037,195
Total Commercial And Industrial [Member] | Commercial Non-Real Estate [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | 9,416,990 | 9,986,983 | 10,257,788
Total Commercial And Industrial [Member] | Commercial Real Estate - Owner Occupied [Member] | Total Commercial [Member] |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |
Total loans | $ 2,812,926 | $ 2,857,445 | $ 2,779,407

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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