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Allowance for Credit Losses - Summary of Total Non Purchased and Purchased Loans (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 10,608,904 |  | $ 10,024,981 |  |  |
Unearned income | (5,160) |  | (4,067) |  |  |
Loans, net of unearned income | 10,603,744 |  | 10,020,914 | $ 10,149,242 |  |
Allowance for credit losses | (166,131) | $ (166,468) | (164,171) | (172,354) | $ (173,106) | $ (176,144)
Loans, net | 10,437,613 |  | 9,856,743 |  |  |
Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 9,697,276 |  | 9,015,078 |  |  |
Unearned income | (5,160) |  | (4,067) |  |  |
Loans, net of unearned income | 9,692,116 |  | 9,011,011 |  |  |
Non purchased loans and leases | Paycheck Protection Program |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans, net of unearned income | 7,383 |  | 58,391 |  |  |
Commercial, financial, agricultural |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,497,272 |  | 1,423,270 |  |  |
Loans, net of unearned income | 1,497,272 |  |  | 1,634,633 |  |
Allowance for credit losses | (30,193) | (33,606) | (33,922) | (36,994) | (37,592) | (39,031)
Commercial, financial, agricultural | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,405,642 |  | 1,332,962 |  |  |
Lease financing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 106,510 |  | 80,192 |  |  |
Loans, net of unearned income | 101,350 |  |  | 74,003 |  |
Allowance for credit losses | (1,802) | (1,582) | (1,486) | (1,511) | (1,546) | (1,624)
Lease financing | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 106,510 |  | 80,192 |  |  |
Real estate – construction: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,126,363 |  | 1,104,896 |  |  |
Loans, net of unearned income | 1,126,363 |  |  | 1,051,359 |  |
Allowance for credit losses | (17,290) | (18,411) | (16,419) | (15,729) | (14,977) | (16,047)
Real estate – construction: | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,121,117 |  | 1,099,902 |  |  |
Real estate – construction: | Residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 320,541 |  | 302,275 |  |  |
Real estate – construction: | Residential | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 319,287 |  | 300,988 |  |  |
Real estate – construction: | Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 805,822 |  | 802,621 |  |  |
Real estate – construction: | Commercial | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 801,830 |  | 798,914 |  |  |
Real estate – 1-4 family mortgage: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 3,030,083 |  | 2,724,246 |  |  |
Loans, net of unearned income | 3,030,083 |  |  | 2,702,091 |  |
Allowance for credit losses | (41,910) | (36,848) | (32,356) | (31,303) | (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 | 2,849,675 |  | 2,508,473 |  |  |
Real estate – 1-4 family mortgage: | Primary |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 2,085,078 |  | 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 | 1,976,535 |  | 1,682,050 |  |  |
Real estate – 1-4 family mortgage: | Home equity |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 488,048 |  | 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 | 443,045 |  | 423,108 |  |  |
Real estate – 1-4 family mortgage: | Rental/investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 297,536 |  | 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 | 279,621 |  | 268,245 |  |  |
Real estate – 1-4 family mortgage: | Land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 159,421 |  | 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 | 150,474 |  | 135,070 |  |  |
Real estate – commercial mortgage: |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 4,717,513 |  | 4,549,037 |  |  |
Loans, net of unearned income | 4,717,513 |  |  | 4,530,169 |  |
Allowance for credit losses | (64,373) | (65,231) | (68,940) | (74,893) | (76,225) | (76,127)
Real estate – commercial mortgage: | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 4,110,671 |  | 3,885,984 |  |  |
Real estate – commercial mortgage: | Land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 126,795 |  | 128,739 |  |  |
Real estate – commercial mortgage: | Owner-occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,533,192 |  | 1,563,351 |  |  |
Real estate – commercial mortgage: | Owner-occupied | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 1,323,106 |  | 1,329,219 |  |  |
Real estate – commercial mortgage: | Non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 3,057,526 |  | 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 | 2,674,678 |  | 2,446,370 |  |  |
Installment loans to individuals |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 131,163 |  | 143,340 |  |  |
Loans, net of unearned income | 131,163 |  |  | 156,987 |  |
Allowance for credit losses | (10,563) | $ (10,790) | (11,048) | $ (11,924) | $ (11,072) | $ (11,150)
Installment loans to individuals | Non purchased loans and leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | $ 103,661 |  | $ 107,565 |  |  |

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