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Purchased Loans - Loan Portfolio Not Subject to Risk Rating (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | $ 11,084,738 | $ 9,689,638
Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 2,648,062 | 1,367,972
Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 773,119 | 826,483
Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 2,760,394 | 2,866,613
Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 4,577,009 | 4,244,265
Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 243,226 | 384,305
Purchased loans |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 1,660,514 | 2,101,664
Purchased loans | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 543,747
Purchased loans | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 539,747
Purchased loans | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 4,000
Purchased loans | Commercial, financial, agricultural |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 202,768 | 315,619
Purchased loans | Commercial, financial, agricultural | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 13,935
Purchased loans | Commercial, financial, agricultural | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 13,935
Purchased loans | Commercial, financial, agricultural | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 0
Purchased loans | Real estate – construction: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 34,246 | 51,582
Purchased loans | Real estate – construction: | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,725
Purchased loans | Real estate – construction: | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 1,725
Purchased loans | Real estate – construction: | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 0
Purchased loans | Real estate – 1-4 family mortgage |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 391,102 | 516,487
Purchased loans | Real estate – 1-4 family mortgage | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 398,114
Purchased loans | Real estate – 1-4 family mortgage | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 394,476
Purchased loans | Real estate – 1-4 family mortgage | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 3,638
Purchased loans | Real estate – commercial mortgage: |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | 966,367 | 1,115,389
Purchased loans | Real estate – commercial mortgage: | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 30,573
Purchased loans | Real estate – commercial mortgage: | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 30,472
Purchased loans | Real estate – commercial mortgage: | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 101
Purchased loans | Installment loans to individuals |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income | $ 66,031 | 102,587
Purchased loans | Installment loans to individuals | Performing and Nonperforming |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 99,400
Purchased loans | Installment loans to individuals | Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | 99,139
Purchased loans | Installment loans to individuals | Non- Performing |  |
Loan portfolio not subject to risk rating |  |
Total loans, net of unearned income |  | $ 261

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