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Loans and Allowances for Credit Losses - Schedule of Impaired Loans (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 6,613 $ 8,842
Unpaid Principal Balance 8,328 10,441
Related Allowance 2,131 2,459
Average Recorded Investment 7,730 7,850
Construction, land development and other land loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 324 277
Unpaid Principal Balance 341 289
Related Allowance      
Average Recorded Investment 301 711
Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 207 35
Unpaid Principal Balance 323 84
Related Allowance 48 18
Average Recorded Investment 122 74
1-4 Family residential (includes home equity) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,949 3,103
Unpaid Principal Balance 3,049 3,212
Related Allowance 767 890
Average Recorded Investment 3,026 2,297
Commercial Real Estate (Includes Multi-Family Residential) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,422 4,103
Unpaid Principal Balance 2,645 5,413
Related Allowance 7 445
Average Recorded Investment 2,763 3,502
Commercial and Industrial [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,562 1,214
Unpaid Principal Balance 1,809 1,314
Related Allowance 1,217 1,029
Average Recorded Investment 1,388 1,172
Consumer and other [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 149 110
Unpaid Principal Balance 161 129
Related Allowance 92 77
Average Recorded Investment 130 94
With No Related Allowance Recorded [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,830 3,483
Unpaid Principal Balance 4,405 4,946
Related Allowance      
Average Recorded Investment 3,158 2,873
With No Related Allowance Recorded [Member] | Construction, land development and other land loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 324 277
Unpaid Principal Balance 341 289
Related Allowance      
Average Recorded Investment 301 711
With No Related Allowance Recorded [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 27 14
Unpaid Principal Balance 137 57
Related Allowance      
Average Recorded Investment 21 46
With No Related Allowance Recorded [Member] | 1-4 Family residential (includes home equity) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 762 584
Unpaid Principal Balance 829 664
Related Allowance      
Average Recorded Investment 673 538
With No Related Allowance Recorded [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,415 2,490
Unpaid Principal Balance 2,637 3,798
Related Allowance      
Average Recorded Investment 1,953 1,470
With No Related Allowance Recorded [Member] | Commercial and Industrial [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 293 103
Unpaid Principal Balance 452 122
Related Allowance      
Average Recorded Investment 198 95
With No Related Allowance Recorded [Member] | Consumer and other [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 9 15
Unpaid Principal Balance 9 16
Related Allowance      
Average Recorded Investment 12 13
With an Allowance Recorded [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 3,783 5,359
Unpaid Principal Balance 3,923 5,495
Related Allowance 2,131 2,459
Average Recorded Investment 4,572 4,977
With an Allowance Recorded [Member] | Construction, land development and other land loans [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment      
Unpaid Principal Balance      
Related Allowance      
Average Recorded Investment      
With an Allowance Recorded [Member] | Agriculture and Agriculture Real Estate (Includes Farmland) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 180 21
Unpaid Principal Balance 186 27
Related Allowance 48 18
Average Recorded Investment 101 28
With an Allowance Recorded [Member] | 1-4 Family residential (includes home equity) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 2,187 2,519
Unpaid Principal Balance 2,220 2,548
Related Allowance 767 890
Average Recorded Investment 2,353 1,759
With an Allowance Recorded [Member] | Commercial Real Estate (Includes Multi-Family Residential) [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 7 1,613
Unpaid Principal Balance 8 1,615
Related Allowance 7 445
Average Recorded Investment 810 2,032
With an Allowance Recorded [Member] | Commercial and Industrial [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,269 1,111
Unpaid Principal Balance 1,357 1,192
Related Allowance 1,217 1,029
Average Recorded Investment 1,190 1,077
With an Allowance Recorded [Member] | Consumer and other [Member]
   
Financing Receivable, Impaired [Line Items]    
Recorded Investment 140 95
Unpaid Principal Balance 152 113
Related Allowance 92 77
Average Recorded Investment $ 118 $ 81