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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 10,318,571 | $ 10,024,981 |  |
Unearned income | (5,112) | (4,067) |  |
Loans, net of unearned income | 10,313,459 | 10,020,914 | $ 10,688,408 |
Allowance for credit losses | (166,468) | (164,171) | (173,106) | $ (176,144)
Loans, net | 10,146,991 | 9,856,743 |  |
Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 9,344,002 | 9,015,078 |  |
Unearned income | (5,112) | (4,067) |  |
Loans, net of unearned income | 9,338,890 | 9,011,011 |  |
Non purchased loans and leases | Paycheck Protection Program |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans, net of unearned income | 8,382 | 58,391 |  |
Commercial, financial, agricultural |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,445,607 | 1,423,270 |  |
Loans, net of unearned income | 1,445,607 |  | 2,249,287 |
Allowance for credit losses | (33,606) | (33,922) | (37,592) | (39,031)
Commercial, financial, agricultural | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,336,239 | 1,332,962 |  |
Lease financing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 94,954 | 80,192 |  |
Loans, net of unearned income | 89,842 |  | 75,256 |
Allowance for credit losses | (1,582) | (1,486) | (1,546) | (1,624)
Lease financing | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 94,954 | 80,192 |  |
Real estate – construction: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,222,052 | 1,104,896 |  |
Loans, net of unearned income | 1,222,052 |  | 955,918 |
Allowance for credit losses | (18,411) | (16,419) | (14,977) | (16,047)
Real estate – construction: | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,216,928 | 1,099,902 |  |
Real estate – construction: | Residential |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 306,655 | 302,275 |  |
Real estate – construction: | Residential | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 305,396 | 300,988 |  |
Real estate – construction: | Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 915,397 | 802,621 |  |
Real estate – construction: | Commercial | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 911,532 | 798,914 |  |
Real estate – 1-4 family mortgage: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 2,840,979 | 2,724,246 |  |
Loans, net of unearned income | 2,840,979 |  | 2,686,061 |
Allowance for credit losses | (36,848) | (32,356) | (31,694) | (32,165)
Real estate – 1-4 family mortgage: | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 2,644,587 | 2,508,473 |  |
Real estate – 1-4 family mortgage: | Primary |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,925,813 | 1,816,120 |  |
Real estate – 1-4 family mortgage: | Primary | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,803,750 | 1,682,050 |  |
Real estate – 1-4 family mortgage: | Home equity |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 470,665 | 474,604 |  |
Real estate – 1-4 family mortgage: | Home equity | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 424,426 | 423,108 |  |
Real estate – 1-4 family mortgage: | Rental/investment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 292,811 | 288,474 |  |
Real estate – 1-4 family mortgage: | Rental/investment | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 274,117 | 268,245 |  |
Real estate – 1-4 family mortgage: | Land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 151,690 | 145,048 |  |
Real estate – 1-4 family mortgage: | Land development | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 142,294 | 135,070 |  |
Real estate – commercial mortgage: |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 4,577,864 | 4,549,037 |  |
Loans, net of unearned income | 4,577,864 |  | 4,549,027 |
Allowance for credit losses | (65,231) | (68,940) | (76,225) | (76,127)
Real estate – commercial mortgage: | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 3,945,540 | 3,885,984 |  |
Real estate – commercial mortgage: | Land development |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 132,055 | 128,739 |  |
Real estate – commercial mortgage: | Owner-occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,538,693 | 1,563,351 |  |
Real estate – commercial mortgage: | Owner-occupied | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 1,318,446 | 1,329,219 |  |
Real estate – commercial mortgage: | Non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 2,907,116 | 2,856,947 |  |
Real estate – commercial mortgage: | Non-owner occupied | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 2,510,981 | 2,446,370 |  |
Installment loans to individuals |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | 137,115 | 143,340 |  |
Loans, net of unearned income | 137,115 |  | 172,859 |
Allowance for credit losses | (10,790) | (11,048) | $ (11,072) | $ (11,150)
Installment loans to individuals | Non purchased loans and leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross loans | $ 105,754 | $ 107,565 |  |

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