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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | $ 10,153,267 |  | $ 10,937,807 |  |  |  |
Unearned income | (4,025) |  | (4,160) |  |  |  |
Loans, net of unearned income | 10,149,242 |  | 10,933,647 | $ 10,997,304 |  |  |
Allowance for credit losses | (172,354) | $ (173,106) | (176,144) | (145,387) | $ (120,185) | $ (52,162) |
Loans, net | 9,976,888 |  | 10,757,503 |  |  |  |
Commercial, financial, agricultural |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 1,634,633 |  | 2,536,984 |  |  |  |
Loans, net of unearned income | 1,634,633 |  |  | 2,641,598 |  |  |
Allowance for credit losses | (36,994) | (37,592) | (39,031) | (30,685) | (25,937) | (10,658) |
Lease financing |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 78,028 |  | 80,022 |  |  |  |
Loans, net of unearned income | 74,003 |  |  | 80,779 |  |  |
Allowance for credit losses | (1,511) | (1,546) | (1,624) | (1,812) |  | (910) | $ (1,588)
Real estate – construction: |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 1,051,359 |  | 858,104 |  |  |  |
Loans, net of unearned income | 1,051,359 |  |  | 791,108 |  |  |
Allowance for credit losses | (15,729) | (14,977) | (16,047) | (12,538) | (10,924) | (5,029) |
Real estate – construction: | Residential |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 277,163 |  | 246,673 |  |  |  |
Real estate – construction: | Commercial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 774,196 |  | 611,431 |  |  |  |
Real estate – 1-4 family mortgage: |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 2,702,091 |  | 2,698,308 |  |  |  |
Loans, net of unearned income | 2,702,091 |  |  | 2,788,513 |  |  |
Allowance for credit losses | (31,303) | (31,694) | (32,165) | (29,401) | (27,320) | (9,814) |
Real estate – 1-4 family mortgage: | Primary |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 1,790,522 |  | 1,750,951 |  |  |  |
Real estate – 1-4 family mortgage: | Home equity |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 489,933 |  | 513,160 |  |  |  |
Real estate – 1-4 family mortgage: | Rental/investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 297,341 |  | 296,364 |  |  |  |
Real estate – 1-4 family mortgage: | Land development |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 124,295 |  | 137,833 |  |  |  |
Real estate – commercial mortgage: |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 4,530,169 |  | 4,554,852 |  |  |  |
Loans, net of unearned income | 4,530,169 |  |  | 4,410,753 |  |  |
Allowance for credit losses | (74,893) | (76,225) | (76,127) | (60,061) | (44,237) | (24,990) |
Real estate – commercial mortgage: | Land development |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 124,949 |  | 149,579 |  |  |  |
Real estate – commercial mortgage: | Owner-occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 1,663,191 |  | 1,657,806 |  |  |  |
Real estate – commercial mortgage: | Non-owner occupied |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 2,742,029 |  | 2,747,467 |  |  |  |
Installment loans to individuals |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Gross loans | 156,987 |  | 209,537 |  |  |  |
Loans, net of unearned income | 156,987 |  |  | 284,553 |  |  |
Allowance for credit losses | $ (11,924) | $ (11,072) | $ (11,150) | $ (10,890) | $ (10,179) | $ (761) |

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