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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 6,922,075 | $ 6,189,148 | $ 6,003,059
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,773,099 |  | 1,236,424
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 416,329 |  | 441,854
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,723,288 |  | 1,579,441
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,224,710 |  | 2,118,582
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 784,649 |  | $ 626,758
Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 4,981 | 3,385 |
Financing Receivable, Not Past Due | 399,144 | 471,390 |
Total | 404,125 | 474,775 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 338 | 76 |
Financing Receivable, Not Past Due | 26,266 | 29,751 |
Total | 26,604 | 29,827 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 308 | 0 |
Financing Receivable, Not Past Due | 2,616 | 6,262 |
Total | 2,924 | 6,262 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 2,143 | 2,681 |
Financing Receivable, Not Past Due | 226,220 | 262,873 |
Total | 228,363 | 265,554 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 2,064 | 405 |
Financing Receivable, Not Past Due | 132,988 | 158,768 |
Total | 135,052 | 159,173 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 128 | 223 |
Financing Receivable, Not Past Due | 11,054 | 13,736 |
Total | 11,182 | 13,959 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 899 | 392 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 264 | 1 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 580 | 304 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 55 | 87 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 100 | 403 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 76 | 207 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 107 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 24 | 89 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 212 | 257 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 1 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 174 | 221 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 38 | 35 |
Acquired Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 3,770 | 2,333 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 74 | 74 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 308 | 0 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,313 | 1,949 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,064 | 298 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 11 | 12 |
Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 51,085 | 34,741 |
Financing Receivable, Not Past Due | 6,466,865 | 5,679,632 |
Total | 6,517,950 | 5,714,373 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 8,641 | 9,368 |
Financing Receivable, Not Past Due | 1,737,854 | 1,202,658 |
Total | 1,746,495 | 1,212,026 |
Originated Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 0 | 207 |
Financing Receivable, Not Past Due | 413,405 | 442,570 |
Total | 413,405 | 442,777 |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 9,331 | 11,888 |
Financing Receivable, Not Past Due | 1,485,594 | 1,403,920 |
Total | 1,494,925 | 1,415,808 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 30,386 | 6,950 |
Financing Receivable, Not Past Due | 2,059,272 | 1,951,396 |
Total | 2,089,658 | 1,958,346 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 2,727 | 6,328 |
Financing Receivable, Not Past Due | 770,740 | 679,088 |
Total | 773,467 | 685,416 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 3,774 | 8,643 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 155 | 391 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 198 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,028 | 3,757 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 220 | 227 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,371 | 4,070 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,304 | 1,940 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 48 | 57 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 695 | 749 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 69 | 114 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 492 | 1,020 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,209 | 1,816 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 15 | 140 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 9 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 562 | 736 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 632 | 931 |
Originated Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 44,798 | 22,342 |
Originated Loans [Member] | Non Accrual Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 8,423 | 8,780 |
Originated Loans [Member] | Non Accrual Loans [Member] | Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Originated Loans [Member] | Non Accrual Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 6,046 | 6,646 |
Originated Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 30,097 | 6,609 |
Originated Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | $ 232 | $ 307 |

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