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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | $ 9,769,377 | $ 9,689,638
Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,367,972
Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 826,483
Real estate – 1-4 family mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 2,866,613
Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 4,244,265
Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 384,305
Non purchased loans and leases |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | $ 7,802,404 | 7,587,974
Non purchased loans and leases | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 2,933,132
Non purchased loans and leases | Performing and Nonperforming | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 248,891
Non purchased loans and leases | Performing and Nonperforming | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 81,875
Non purchased loans and leases | Performing and Nonperforming | Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 66,241
Non purchased loans and leases | Performing and Nonperforming | Real estate – 1-4 family mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 2,003,619
Non purchased loans and leases | Performing and Nonperforming | Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 332,669
Non purchased loans and leases | Performing and Nonperforming | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 199,837
Non purchased loans and leases | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 2,918,059
Non purchased loans and leases | Performing | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 247,575
Non purchased loans and leases | Performing | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 81,649
Non purchased loans and leases | Performing | Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 66,241
Non purchased loans and leases | Performing | Real estate – 1-4 family mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,992,331
Non purchased loans and leases | Performing | Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 330,714
Non purchased loans and leases | Performing | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 199,549
Non purchased loans and leases | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 15,073
Non purchased loans and leases | Non- Performing | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,316
Non purchased loans and leases | Non- Performing | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 226
Non purchased loans and leases | Non- Performing | Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 0
Non purchased loans and leases | Non- Performing | Real estate – 1-4 family mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 11,288
Non purchased loans and leases | Non- Performing | Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,955
Non purchased loans and leases | Non- Performing | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | $ 288

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