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Loans - Schedule Of Loans By Portfolio Segment (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | $ 31,061,111 | [1] |  | $ 27,535,532 | [1] |  | $ 27,658,929 |
Allowance for loan losses | 200,307 |  |  | 180,424 |  |  | 189,555 | $ 202,068
Total net loans | 30,860,804 |  |  | 27,355,108 |  |  |  |
Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses | 158,598 |  |  | 130,258 |  |  |  |
Commercial | Commercial, financial, and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 20,051,091 |  |  | 16,514,328 |  |  | 16,057,273 |
Allowance for loan losses | 122,486 |  |  | 98,947 |  |  | 98,211 | 89,398
Commercial | Commercial real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 4,337,017 |  |  | 4,030,870 |  |  | 4,214,695 |
Allowance for loan losses | 36,112 |  |  | 31,311 |  |  | 28,427 | 33,852
Consumer | Consumer real estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 6,006,749 |  |  | 6,249,516 |  |  | 6,479,242 |
Allowance for loan losses | 19,624 |  |  | 26,439 |  |  | 39,823 | 51,424
Consumer | Permanent mortgage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 170,390 |  |  | 222,448 |  |  | 287,820 |
Allowance for loan losses | 8,819 |  |  | 11,000 |  |  | 13,113 | 15,222
Consumer | Credit card & other |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income | 495,864 |  |  | 518,370 |  |  | 619,899 |
Allowance for loan losses | $ 13,266 |  |  | 12,727 |  |  | $ 9,981 | $ 12,172
Consumer | Restricted And Secured Consumer Real Estate Loans |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  |  |  | $ 16,200 |  |  |  |
Restatement Adjustment | Commercial | Commercial, financial, and industrial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans, net of unearned income |  |  | $ (410,000) |  |  | $ (410,000) |  |
[1] | December 31, 2019 and 2018 include $18.8 million and $28.6 million, respectively, of held-to-maturity consumer mortgage loans secured by residential real estate in process of foreclosure.

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