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Loans and Allowance for Credit Losses - Age Analysis of Past Due Loans by Segment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   $ 49,636  
Current   4,634,114  
Loans $ 4,879,347 4,683,750 $ 4,457,308
Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   24,195  
Current   1,126,711  
Loans 1,139,547 1,150,906  
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   308  
Current   220,428  
Loans 219,621 220,736  
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   13,045  
Current   1,211,420  
Loans 1,229,192 1,224,465  
Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   7,069  
Current   1,471,931  
Loans 1,742,210 1,479,000  
Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual   5,019  
Current   603,624  
Loans 548,777 608,643  
Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,139,547 1,150,906 1,052,109
Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 219,621 220,736 120,785
Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,229,192 1,224,465 1,226,344
Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,742,210 1,479,000 1,405,256
Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 548,777 608,643 $ 652,814
Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   8,598  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   364  
Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   280  
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   4,175  
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   781  
Financing Receivables, 30 to 59 Days Past Due [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   2,998  
Financing Receivables, 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   1,878  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   49  
Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   1,055  
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   0  
Financing Receivables, 60 to 89 Days Past Due [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   774  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   2,455  
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]      
Financing Receivable, Recorded Investment, Past Due   129  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   0  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   1,315  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   65  
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   946  
Nonaccrual Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   36,705  
Nonaccrual Commercial Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   23,653  
Nonaccrual Commercial Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   28  
Nonaccrual Commercial Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   6,500  
Nonaccrual Commercial Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   6,223  
Nonaccrual Commercial Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due   $ 301  
Originated Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 40,497    
Current 4,737,974    
Loans 4,778,471    
Originated Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 20,554    
Current 1,110,594    
Loans 1,131,148    
Originated Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 183    
Current 217,657    
Loans 217,840    
Originated Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 12,009    
Current 1,153,842    
Loans 1,165,851    
Originated Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 4,092    
Current 1,712,951    
Loans 1,717,043    
Originated Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 3,659    
Current 542,930    
Loans 546,589    
Originated Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,131,148    
Originated Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 217,840    
Originated Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,165,851    
Originated Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,717,043    
Originated Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 546,589    
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 8,601    
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]      
Financing Receivable, Recorded Investment, Past Due 2,380    
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 183    
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 4,133    
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 265    
Originated Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 1,640    
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,363    
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]      
Financing Receivable, Recorded Investment, Past Due 171    
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 1,089    
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 327    
Originated Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 776    
Originated Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 2,097    
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]      
Financing Receivable, Recorded Investment, Past Due 75    
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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 995    
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]      
Financing Receivable, Recorded Investment, Past Due 57    
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]      
Financing Receivable, Recorded Investment, Past Due 970    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 27,436    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 17,928    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 5,792    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 3,443    
Originated Loans [Member] | Nonaccrual Commercial Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 273    
Acquired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 1,302    
Current 99,574    
Loans 100,876    
Acquired Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 486    
Current 7,913    
Loans 8,399    
Acquired Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 0    
Current 1,781    
Loans 1,781    
Acquired Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 643    
Current 62,698    
Loans 63,341    
Acquired Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 162    
Current 25,005    
Loans 25,167    
Acquired Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total past due and nonaccrual 11    
Current 2,177    
Loans 2,188    
Acquired Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 8,399    
Acquired Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 1,781    
Acquired Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 63,341    
Acquired Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 25,167    
Acquired Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans 2,188    
Acquired Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 635    
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]      
Financing Receivable, Recorded Investment, Past Due 486    
Acquired Loans [Member] | Financing Receivables, 30 to 59 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 1    
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 46    
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]      
Financing Receivable, Recorded Investment, Past Due 0    
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 39    
Acquired Loans [Member] | Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 7    
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 34    
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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 34    
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]      
Financing Receivable, Recorded Investment, Past Due 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]      
Financing Receivable, Recorded Investment, Past Due 0    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 587    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial Financial Agricultural And Other [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Real Estate Construction [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 0    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Residential real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 422    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Commercial real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due 162    
Acquired Loans [Member] | Nonaccrual Commercial Loans [Member] | Loans To Individuals [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Financing Receivable, Recorded Investment, Past Due $ 3