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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 5,381,305 | $ 5,407,376 | $ 4,907,961
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,131,594 |  | 1,148,460
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 246,961 |  | 240,122
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 1,434,623 |  | 1,217,398
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 2,027,072 |  | 1,761,101
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 541,055 |  | $ 540,880
Acquired Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 2,529 | 2,570 |
Financing Receivable, Recorded Investment, Current | 381,661 | 397,445 |
Total | 384,190 | 400,015 |
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 | 448 | 449 |
Financing Receivable, Recorded Investment, Current | 37,954 | 40,193 |
Total | 38,402 | 40,642 |
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 | 0 | 0 |
Financing Receivable, Recorded Investment, Current | 1,120 | 5,963 |
Total | 1,120 | 5,963 |
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 | 968 | 945 |
Financing Receivable, Recorded Investment, Current | 212,666 | 219,306 |
Total | 213,634 | 220,251 |
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 | 1,000 | 1,077 |
Financing Receivable, Recorded Investment, Current | 124,463 | 125,834 |
Total | 125,463 | 126,911 |
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 | 113 | 99 |
Financing Receivable, Recorded Investment, Current | 5,458 | 6,149 |
Total | 5,571 | 6,248 |
Acquired Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 196 | 190 |
Acquired Loans [Member] | Financing Receivables, 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 | 11 | 6 |
Acquired Loans [Member] | Financing Receivables, 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] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 119 | 148 |
Acquired Loans [Member] | Financing Receivables, 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] | Financing Receivables, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 66 | 36 |
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 121 | 36 |
Acquired Loans [Member] | Financing Receivables, 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 | 7 |
Acquired Loans [Member] | Financing Receivables, 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] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 110 | 9 |
Acquired Loans [Member] | Financing Receivables, 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 | 0 |
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 11 | 20 |
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 66 | 109 |
Acquired Loans [Member] | Financing Receivables, Equal to 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 | 26 | 0 |
Acquired Loans [Member] | Financing Receivables, Equal to 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] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 21 | 83 |
Acquired Loans [Member] | Financing Receivables, Equal to 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] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 19 | 26 |
Acquired Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,146 | 2,235 |
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 | 411 | 436 |
Acquired 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 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 718 | 705 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,000 | 1,077 |
Acquired Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 17 | 17 |
Originated Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing Receivable Recorded Investment Equal To Or Greater Than Thirty Days Past Due | 48,690 | 41,362 |
Financing Receivable, Recorded Investment, Current | 4,948,425 | 4,965,999 |
Total | 4,997,115 | 5,007,361 |
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 | 26,652 | 19,220 |
Financing Receivable, Recorded Investment, Current | 1,066,540 | 1,103,521 |
Total | 1,093,192 | 1,122,741 |
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 | 199 |
Financing Receivable, Recorded Investment, Current | 245,841 | 242,706 |
Total | 245,841 | 242,905 |
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 | 10,681 | 12,944 |
Financing Receivable, Recorded Investment, Current | 1,210,308 | 1,193,175 |
Total | 1,220,989 | 1,206,119 |
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 | 8,513 | 5,472 |
Financing Receivable, Recorded Investment, Current | 1,893,096 | 1,886,713 |
Total | 1,901,609 | 1,892,185 |
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 | 2,844 | 3,527 |
Financing Receivable, Recorded Investment, Current | 532,640 | 539,884 |
Total | 535,484 | 543,411 |
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 8,132 | 9,292 |
Originated Loans [Member] | Financing Receivables, 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 | 2,163 | 378 |
Originated Loans [Member] | Financing Receivables, 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 | 199 |
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,849 | 4,618 |
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,751 | 2,198 |
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,369 | 1,899 |
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 2,265 | 1,883 |
Originated Loans [Member] | Financing Receivables, 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 | 23 | 61 |
Originated Loans [Member] | Financing Receivables, 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] | Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 996 | 1,025 |
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 783 | 28 |
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 463 | 769 |
Originated Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 1,889 | 1,745 |
Originated Loans [Member] | Financing Receivables, Equal to 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 | 168 | 40 |
Originated Loans [Member] | Financing Receivables, Equal to 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 |
Originated Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 649 | 1,076 |
Originated Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 304 | 6 |
Originated Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 768 | 623 |
Originated Loans [Member] | Non Accrual Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 36,404 | 28,442 |
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 | 24,298 | 18,741 |
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 | 6,187 | 6,225 |
Originated Loans [Member] | Non Accrual Loans [Member] | Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | 5,675 | 3,240 |
Originated Loans [Member] | Non Accrual Loans [Member] | Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total past due and nonaccrual | $ 244 | $ 236 |

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