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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 6,189,148 | $ 5,774,139 | $ 5,407,376
Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 699,375 | 590,739 | 549,659
Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 449,039 | 358,978 | 248,868
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,241,853 | 1,138,473 | 1,163,383
Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 1,681,362 | 1,562,405 | 1,426,370
Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | 2,117,519 | 2,123,544 | $ 2,019,096
Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 34,741 | 30,100 |
Current | 5,679,632 | 5,245,196 |
Loans | 5,714,373 | 5,275,296 |
Originated Loans [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 6,328 | 3,763 |
Current | 679,088 | 581,584 |
Loans | 685,416 | 585,347 |
Originated Loans [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 207 | 212 |
Current | 442,570 | 352,796 |
Loans | 442,777 | 353,008 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 9,368 | 10,692 |
Current | 1,202,658 | 1,090,255 |
Loans | 1,212,026 | 1,100,947 |
Originated Loans [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 11,888 | 11,435 |
Current | 1,403,920 | 1,302,210 |
Loans | 1,415,808 | 1,313,645 |
Originated Loans [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 6,950 | 3,998 |
Current | 1,951,396 | 1,918,351 |
Loans | 1,958,346 | 1,922,349 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 8,643 | 6,893 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 4,070 | 2,362 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 198 | 212 |
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] |  |  |
Financing Receivable, Past Due | 391 | 130 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 3,757 | 3,697 |
Originated Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 227 | 492 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 1,940 | 1,558 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 1,020 | 532 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
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] |  |  |
Financing Receivable, Past Due | 57 | 247 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 749 | 710 |
Originated Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 114 | 69 |
Originated Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 1,816 | 1,544 |
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] |  |  |
Financing Receivable, Past Due | 931 | 662 |
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] |  |  |
Financing Receivable, Past Due | 9 | 0 |
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] |  |  |
Financing Receivable, Past Due | 140 | 92 |
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] |  |  |
Financing Receivable, Past Due | 736 | 790 |
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] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 22,342 | 20,105 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 307 | 207 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 8,780 | 10,223 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 6,646 | 6,238 |
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 6,609 | 3,437 |
Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 3,385 | 3,512 |
Current | 471,390 | 495,331 |
Loans | 474,775 | 498,843 |
Acquired Loans [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 223 | 84 |
Current | 13,736 | 5,308 |
Loans | 13,959 | 5,392 |
Acquired Loans [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 0 | 0 |
Current | 6,262 | 5,970 |
Loans | 6,262 | 5,970 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 76 | 205 |
Current | 29,751 | 37,321 |
Loans | 29,827 | 37,526 |
Acquired Loans [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,681 | 2,181 |
Current | 262,873 | 246,579 |
Loans | 265,554 | 248,760 |
Acquired Loans [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 405 | 1,042 |
Current | 158,768 | 200,153 |
Loans | 159,173 | 201,195 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 392 | 273 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 87 | 46 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
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] |  |  |
Financing Receivable, Past Due | 1 | 1 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 304 | 226 |
Acquired Loans [Member] | Financial Asset, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 403 | 36 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 89 | 12 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
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] |  |  |
Financing Receivable, Past Due | 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] |  |  |
Financing Receivable, Past Due | 207 | 24 |
Acquired Loans [Member] | Financial Asset, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 107 | 0 |
Acquired Loans [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 257 | 38 |
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] |  |  |
Financing Receivable, Past Due | 35 | 11 |
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] |  |  |
Financing Receivable, Past Due | 0 | 0 |
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] |  |  |
Financing Receivable, Past Due | 1 | 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] |  |  |
Financing Receivable, Past Due | 221 | 27 |
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] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 2,333 | 3,165 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Loans To Individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 12 | 15 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Real Estate Construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 0 | 0 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 74 | 204 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Residential Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | 1,949 | 1,904 |
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable, Past Due | $ 298 | $ 1,042 |

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