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Non Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | $ 10,933,647 | $ 9,689,638
Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 2,536,984 | 1,367,972
Lease financing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 75,862 |
Real estate - construction |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 858,104 | 826,483
Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 2,698,308 | 2,866,613
Real estate - commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 4,554,852 | 4,244,265
Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | 209,537 | 384,305
Non-Purchased |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income | $ 9,419,540 | 7,587,974
Non-Purchased | Performing and Non-Performing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 2,933,132
Non-Purchased | Performing and Non-Performing | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 248,891
Non-Purchased | Performing and Non-Performing | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 81,875
Non-Purchased | Performing and Non-Performing | Real estate - construction |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 66,241
Non-Purchased | Performing and Non-Performing | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 2,003,619
Non-Purchased | Performing and Non-Performing | Real estate - commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 332,669
Non-Purchased | Performing and Non-Performing | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 199,837
Non-Purchased | Performing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 2,918,059
Non-Purchased | Performing | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 247,575
Non-Purchased | Performing | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 81,649
Non-Purchased | Performing | Real estate - construction |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 66,241
Non-Purchased | Performing | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 1,992,331
Non-Purchased | Performing | Real estate - commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 330,714
Non-Purchased | Performing | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 199,549
Non-Purchased | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 15,073
Non-Purchased | Non- Performing | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 1,316
Non-Purchased | Non- Performing | Lease financing |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 226
Non-Purchased | Non- Performing | Real estate - construction |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 0
Non-Purchased | Non- Performing | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 11,288
Non-Purchased | Non- Performing | Real estate - commercial mortgage |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | 1,955
Non-Purchased | Non- Performing | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Loans, net of unearned income |  | $ 288

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