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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | $ 10,016,824 | $ 10,933,647 | $ 11,084,738
Commercial, financial, agricultural |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 1,436,019 |  | 2,648,062
Lease financing |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 79,215 |  | 82,928
Real estate – construction: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 1,091,296 |  | 773,119
Real estate – 1-4 family mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 2,724,743 |  | 2,760,394
Real estate – commercial mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 4,535,730 |  | 4,577,009
Installment loans to individuals |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 149,821 |  | $ 243,226
Non purchased loans and leases |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | $ 8,875,880 | $ 9,419,540 |

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