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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
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Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | $ 10,688,408 | $ 10,933,647 | $ 9,769,377
Commercial, financial, agricultural |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 2,249,287 |  | 1,424,576
Lease financing |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 75,256 |  | 84,679
Real estate – construction: |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 955,918 |  | 787,895
Real estate – 1-4 family mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 2,686,061 |  | 2,846,301
Real estate – commercial mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 4,549,027 |  | 4,308,708
Installment loans to individuals |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | 172,859 |  | $ 317,218
Non purchased loans and leases |  |  |
Loan portfolio not subject to risk rating |  |  |
Total loans, net of unearned income | $ 9,292,502 | $ 9,419,540 |

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