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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
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Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | $ 10,149,242 | $ 10,933,647 | $ 10,997,304
Commercial, financial, agricultural |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 1,634,633 |  | 2,641,598
Lease financing |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 74,003 |  | 80,779
Real estate – construction: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 1,051,359 |  | 791,108
Real estate – 1-4 family mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 2,702,091 |  | 2,788,513
Real estate – commercial mortgage: |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 4,530,169 |  | 4,410,753
Installment loans to individuals |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | 156,987 |  | $ 284,553
Non purchased loans and leases |  |  |
Loan portfolio not subject to risk rating |  |  |
Loans, net of unearned income | $ 8,892,544 | $ 9,419,540 |

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