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Loans and Allowance for Loan Losses - Schedule of Allowances for Loan Losses by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance $ 23,593 $ 35,156 $ 34,576
Provision for loan losses 9,947 28,451 30,341
Loans charged off (13,284) (41,163) (31,623)
Ending balance 22,377 23,593 35,156
Recoveries of loans previously charged off 2,121 1,149 1,862
Ending balance 22,377 23,593 35,156
Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment 3,585 4,554 15,966
Loans collectively evaluated for impairment 18,792 19,039 19,190
Ending balance 22,377 23,593 35,156
Ending balance 22,377 23,593 35,156
Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment 39,203 45,320 (77,573)
Collectively evaluated for impairment 1,579,251 1,405,315 (1,254,513)
Ending balance 1,618,454 1,450,635  
Ending balance     1,332,086
Ending balance     1,332,086
Ending balance 1,618,454 1,450,635  
Commercial, Financial and Agricultural [Member] | Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 2,439 2,918 2,779
Provision for loan losses 711 815 5,772
Loans charged off (1,759) (1,451) (5,807)
Ending balance 1,823 2,439 2,918
Recoveries of loans previously charged off 432 157 174
Ending balance 1,823 2,439 2,918
Commercial, Financial and Agricultural [Member] | Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment 356 659 766
Loans collectively evaluated for impairment 1,467 1,780 2,152
Ending balance 1,823 2,439 2,918
Ending balance 1,823 2,439 2,918
Commercial, Financial and Agricultural [Member] | Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment 3,457 3,351 (2,831)
Collectively evaluated for impairment 240,916 170,866 (140,129)
Ending balance 244,373 174,217  
Ending balance     142,960
Ending balance     142,960
Ending balance 244,373 174,217  
Real Estate - Construction and Development [Member] | Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 5,343 9,438 7,705
Provision for loan losses 1,742 5,245 11,354
Loans charged off (2,020) (9,380) (10,988)
Ending balance 5,538 5,343 9,438
Recoveries of loans previously charged off 473 40 1,367
Ending balance 5,538 5,343 9,438
Real Estate - Construction and Development [Member] | Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment 407 611 3,478
Loans collectively evaluated for impairment 5,131 4,732 5,960
Ending balance 5,538 5,343 9,438
Ending balance 5,538 5,343 9,438
Real Estate - Construction and Development [Member] | Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment 3,581 7,617 (13,561)
Collectively evaluated for impairment 142,790 106,582 (116,709)
Ending balance 146,371 114,199  
Ending balance     130,270
Ending balance     130,270
Ending balance 146,371 114,199  
Real Estate - Commercial and Farmland [Member] | Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 9,157 14,226 14,971
Provision for loan losses 2,777 15,000 7,883
Loans charged off (3,571) (20,551) (8,680)
Ending balance 8,393 9,157 14,226
Recoveries of loans previously charged off 30 482 52
Ending balance 8,393 9,157 14,226
Real Estate - Commercial and Farmland [Member] | Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment 1,427 2,228 8,152
Loans collectively evaluated for impairment 6,966 6,929 6,074
Ending balance 8,393 9,157 14,226
Ending balance 8,393 9,157 14,226
Real Estate - Commercial and Farmland [Member] | Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment 15,240 21,332 (45,084)
Collectively evaluated for impairment 793,083 710,990 (627,681)
Ending balance 808,323 732,322  
Ending balance     672,765
Ending balance     672,765
Ending balance 808,323 732,322  
Real Estate - Residential [Member] | Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 5,898 8,128 8,664
Provision for loan losses 4,463 6,267 4,717
Loans charged off (5,215) (8,722) (5,399)
Ending balance 6,034 5,898 8,128
Recoveries of loans previously charged off 888 225 146
Ending balance 6,034 5,898 8,128
Real Estate - Residential [Member] | Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment 1,395 1,056 3,567
Loans collectively evaluated for impairment 4,639 4,842 4,561
Ending balance 6,034 5,898 8,128
Ending balance 6,034 5,898 8,128
Real Estate - Residential [Member] | Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment 16,925 13,020 (16,080)
Collectively evaluated for impairment 334,961 333,460 (314,647)
Ending balance 351,886 346,480  
Ending balance     330,727
Ending balance     330,727
Ending balance 351,886 346,480  
Consumer Installment Loans and Other [Member] | Loans Receivable [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Beginning balance 756 446 457
Provision for loan losses 254 1,124 615
Loans charged off (719) (1,059) (749)
Ending balance 589 756 446
Recoveries of loans previously charged off 298 245 123
Ending balance 589 756 446
Consumer Installment Loans and Other [Member] | Period-End Amount Allocated to [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Loans individually evaluated for impairment     3
Loans collectively evaluated for impairment 589 756 443
Ending balance 589 756 446
Ending balance 589 756 446
Consumer Installment Loans and Other [Member] | Loans [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Individually evaluated for impairment     (17)
Collectively evaluated for impairment 67,501 83,417 (55,347)
Ending balance 67,501 83,417  
Ending balance     55,364
Ending balance     55,364
Ending balance $ 67,501 $ 83,417