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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | $ 10,692,423 | $ 10,937,807 |  |  |
Unearned income | (4,015) | (4,160) |  |  |
Loans, net of unearned income | 10,688,408 | 10,933,647 | $ 9,769,377 |  |
Allowance for credit losses | (173,106) | (176,144) | (120,185) | $ (52,162) |
Loans, net | 10,515,302 | 10,757,503 |  |  |
Commercial, financial, agricultural |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 2,249,287 | 2,536,984 |  |  |
Loans, net of unearned income | 2,249,287 |  | 1,424,576 |  |
Allowance for credit losses | (37,592) | (39,031) | (25,937) | (10,658) |
Lease financing |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 79,271 | 80,022 |  |  |
Loans, net of unearned income | 75,256 |  | 84,679 |  |
Allowance for credit losses | (1,546) | (1,624) | (1,588) |  | $ (910)
Real estate – construction: |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 955,918 | 858,104 |  |  |
Loans, net of unearned income | 955,918 |  | 787,895 |  |
Allowance for credit losses | (14,977) | (16,047) | (10,924) | (5,029) |
Real estate – construction: | Residential |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 255,356 | 246,673 |  |  |
Real estate – construction: | Commercial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 700,562 | 611,431 |  |  |
Real estate – 1-4 family mortgage: |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 2,686,061 | 2,698,308 |  |  |
Loans, net of unearned income | 2,686,061 |  | 2,846,301 |  |
Allowance for credit losses | (31,694) | (32,165) | (27,320) | (9,814) |
Real estate – 1-4 family mortgage: | Primary |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 1,766,751 | 1,750,951 |  |  |
Real estate – 1-4 family mortgage: | Home equity |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 504,620 | 513,160 |  |  |
Real estate – 1-4 family mortgage: | Rental/investment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 285,779 | 296,364 |  |  |
Real estate – 1-4 family mortgage: | Land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 128,911 | 137,833 |  |  |
Real estate – commercial mortgage: |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 4,549,027 | 4,554,852 |  |  |
Loans, net of unearned income | 4,549,027 |  | 4,308,708 |  |
Allowance for credit losses | (76,225) | (76,127) | (44,237) | (24,990) |
Real estate – commercial mortgage: | Land development |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 136,388 | 149,579 |  |  |
Real estate – commercial mortgage: | Owner-occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 1,644,770 | 1,657,806 |  |  |
Real estate – commercial mortgage: | Non-owner occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 2,767,869 | 2,747,467 |  |  |
Installment loans to individuals |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Gross loans | 172,859 | 209,537 |  |  |
Loans, net of unearned income | 172,859 |  | 317,218 |  |
Allowance for credit losses | $ (11,072) | $ (11,150) | $ (10,179) | $ (761) |

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