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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 4,252,213 $ 4,283,833
Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 4,104,757 4,121,472
OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 66,227 79,124
Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 81,229 83,237
Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 147,456 162,361
Commercial, financial, agricultural and other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,017,412 1,021,056
Commercial, financial, agricultural and other [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 945,063 943,107
Commercial, financial, agricultural and other [Member] | OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 23,958 35,429
Commercial, financial, agricultural and other [Member] | Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 48,391 42,520
Commercial, financial, agricultural and other [Member] | Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Commercial, financial, agricultural and other [Member] | Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 72,349 77,949
Real estate construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 95,110 93,289
Real estate construction [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 83,456 79,679
Real estate construction [Member] | OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 8,686 9,710
Real estate construction [Member] | Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 2,968 3,900
Real estate construction [Member] | Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Real estate construction [Member] | Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 11,654 13,610
Residential real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,240,169 1,262,718
Residential real estate [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,225,083 1,245,422
Residential real estate [Member] | OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 3,375 5,161
Residential real estate [Member] | Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 11,711 12,135
Residential real estate [Member] | Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Residential real estate [Member] | Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 15,086 17,296
Commercial Real Estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,290,852 1,296,472
Commercial Real Estate [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,242,664 1,243,170
Commercial Real Estate [Member] | OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 30,207 28,823
Commercial Real Estate [Member] | Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 17,981 24,479
Commercial Real Estate [Member] | Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Commercial Real Estate [Member] | Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 48,188 53,302
Loans to individuals [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 608,670 610,298
Loans to individuals [Member] | Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 608,491 610,094
Loans to individuals [Member] | OAEM [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1 1
Loans to individuals [Member] | Substandard [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 178 203
Loans to individuals [Member] | Doubtful [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Loans to individuals [Member] | Total Non-Pass [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 179 $ 204