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Allowance for Loan Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 9,773,049 |  | $ 9,693,463
Unearned income | (3,672) |  | (3,825)
Loans, net of unearned income | 9,769,377 |  | 9,689,638
Allowance for credit losses | (120,185) |  | (52,162)
Loans, net | 9,649,192 |  | 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 | 1,424,576 |  | 1,367,972
Loans, net of unearned income |  |  | 1,367,972
Lease financing |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 88,351 |  | 85,700
Real estate – construction: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 787,895 |  | 826,483
Loans, net of unearned income |  |  | 826,483
Real estate – construction: | Residential |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 289,000 |  | 289,050
Real estate – construction: | Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 498,895 |  | 537,433
Real estate – 1-4 family mortgage: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 2,846,301 |  | 2,866,613
Loans, net of unearned income |  |  | 2,866,613
Real estate – 1-4 family mortgage: | Primary |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,776,436 |  | 1,781,948
Real estate – 1-4 family mortgage: | Home equity |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 563,726 |  | 573,540
Real estate – 1-4 family mortgage: | Rental/investment |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 329,466 |  | 335,100
Real estate – 1-4 family mortgage: | Land development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 176,673 |  | 176,025
Real estate – commercial mortgage: |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 4,308,708 |  | 4,244,265
Loans, net of unearned income |  |  | 4,244,265
Real estate – commercial mortgage: | Land development |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 160,768 |  | 156,089
Real estate – commercial mortgage: | Owner-occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 1,662,998 |  | 1,637,281
Real estate – commercial mortgage: | Non-owner occupied |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | 2,484,942 |  | 2,450,895
Installment loans to individuals |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gross loans | $ 317,218 |  | 302,430
Loans, net of unearned income |  |  | $ 384,305

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