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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | $ 11,000,796 | $ 9,693,463
Unearned income | (3,492) | (3,825)
Loans, net of unearned income | 10,997,304 | 9,689,638
Allowance for credit losses | (145,387) | (52,162)
Loans, net | 10,851,917 | 9,637,476
Cumulative Effect, Period Of Adoption, Adjusted Balance |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans, net of unearned income |  | 9,689,638
Allowance for credit losses |  | (94,646)
Commercial, financial, agricultural |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,641,598 | 1,367,972
Loans, net of unearned income | 2,641,598 | 1,367,972
Lease financing |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 84,271 | 85,700
Loans, net of unearned income | 80,779 |
Real estate – construction: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 791,108 | 826,483
Loans, net of unearned income | 791,108 | 826,483
Real estate – construction: | Residential |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 295,931 | 289,050
Real estate – construction: | Commercial |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 495,177 | 537,433
Real estate – 1-4 family mortgage: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,788,513 | 2,866,613
Loans, net of unearned income | 2,788,513 | 2,866,613
Real estate – 1-4 family mortgage: | Primary |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 1,756,253 | 1,781,948
Real estate – 1-4 family mortgage: | Home equity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 543,468 | 573,540
Real estate – 1-4 family mortgage: | Rental/investment |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 318,803 | 335,100
Real estate – 1-4 family mortgage: | Land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 169,989 | 176,025
Real estate – commercial mortgage: |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 4,410,753 | 4,244,265
Loans, net of unearned income | 4,410,753 | 4,244,265
Real estate – commercial mortgage: | Land development |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 155,766 | 156,089
Real estate – commercial mortgage: | Owner-occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 1,660,674 | 1,637,281
Real estate – commercial mortgage: | Non-owner occupied |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 2,594,313 | 2,450,895
Installment loans to individuals |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Gross loans | 284,553 | 302,430
Loans, net of unearned income | $ 284,553 | $ 384,305

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