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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Contract
Mar. 31, 2013
Contract
Financing Receivable, Modifications [Line Items]    
Number of Contracts 21 16
Extend Maturity $ 60 $ 433
Modify Rate 203 481
Modify Payments 549 530
Total Pre-Modification Outstanding Recorded Investment 812 1,444
Post- Modification Outstanding Recorded Investment 791 1,321
Financing Receivable Specific Reserve   0
Specific Reserve 34000  
Commercial, financial, agricultural and other [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1 2
Extend Maturity 60 426
Modify Rate 0 0
Modify Payments 0 12
Total Pre-Modification Outstanding Recorded Investment 60 438
Post- Modification Outstanding Recorded Investment 60 377
Financing Receivable Specific Reserve   0
Specific Reserve 29  
Residential real estate [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 13 9
Extend Maturity 0 7
Modify Rate 172 214
Modify Payments 517 514
Total Pre-Modification Outstanding Recorded Investment 689 735
Post- Modification Outstanding Recorded Investment 676 677
Financing Receivable Specific Reserve   0
Specific Reserve 5  
Commercial Real Estate [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 1 1
Extend Maturity 0 0
Modify Rate 0 244
Modify Payments 12 0
Total Pre-Modification Outstanding Recorded Investment 12 244
Post- Modification Outstanding Recorded Investment 8 242
Specific Reserve 0 0
Loans to individuals [Member]
    
Financing Receivable, Modifications [Line Items]    
Number of Contracts 6 4
Extend Maturity 0 0
Modify Rate 31 23
Modify Payments 20 4
Total Pre-Modification Outstanding Recorded Investment 51 27
Post- Modification Outstanding Recorded Investment 47 25
Financing Receivable Specific Reserve   $ 0
Specific Reserve 0