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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Contract
Dec. 31, 2011
Contract
Dec. 31, 2010
Contract
Financing Receivable, Modifications [Line Items]      
Number of Contracts 60 51 15
Extend Maturity $ 6,776 $ 19,856 $ 359
Modify Rate 4,724 25,302 12,873
Modify Payments 10,332 5,130 36,889
Others 54    
Total Pre-Modification Outstanding Recorded Investment 21,886 50,288 50,121
Post-Modification Outstanding Recorded Investment 22,221 31,993 32,168
Specific Reserve 4,915 1,315 4,975
Commercial, financial, agricultural and other [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 12 13 7
Extend Maturity 1,599 100 250
Modify Rate 187 475 105
Modify Payments 9,476 2,218 36,591
Others 0    
Total Pre-Modification Outstanding Recorded Investment 11,262 2,793 36,946
Post-Modification Outstanding Recorded Investment 11,335 2,749 21,180
Specific Reserve 4,237 743 4,972
Real estate construction [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 2 6 2
Extend Maturity 1,697 2,554 109
Modify Rate 0 86 2,070
Modify Payments 0 0 0
Others 0    
Total Pre-Modification Outstanding Recorded Investment 1,697 2,640 2,179
Post-Modification Outstanding Recorded Investment 2,133 2,852 1,051
Specific Reserve 200 0 0
Residential real estate [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 25 10 2
Extend Maturity 200 0 0
Modify Rate 132 515 13
Modify Payments 697 601 57
Others 48    
Total Pre-Modification Outstanding Recorded Investment 1,077 1,116 70
Post-Modification Outstanding Recorded Investment 973 1,100 67
Specific Reserve 69 65 0
Commercial real estate [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 4 22 4
Extend Maturity 3,280 17,202 0
Modify Rate 4,308 24,226 10,685
Modify Payments 71 2,311 241
Others 0    
Total Pre-Modification Outstanding Recorded Investment 7,659 43,739 10,926
Post-Modification Outstanding Recorded Investment 7,607 25,292 9,870
Specific Reserve 409 507 3
Loans to individuals [Member]
      
Financing Receivable, Modifications [Line Items]      
Number of Contracts 17    
Extend Maturity 0    
Modify Rate 97    
Modify Payments 88    
Others 6    
Total Pre-Modification Outstanding Recorded Investment 191    
Post-Modification Outstanding Recorded Investment 173    
Specific Reserve $ 0