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Loans and Allowance for Loan Losses - Company's Impaired Loans (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 12,544 $ 10,576
Unpaid Principal Balance 14,224 13,041
Related Allowance 919 1,631
Average Recorded Investment 12,419 17,660
Interest Income Recognized 130 482
With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 7,326 3,524
Unpaid Principal Balance 7,321 4,322
Average Recorded Investment 6,733 7,960
Interest Income Recognized 10 212
With Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 5,218 7,052
Unpaid Principal Balance 6,903 8,719
Related Allowance 919 1,631
Average Recorded Investment 5,686 9,700
Interest Income Recognized 120 270
Residential 1-4 Family [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 1,400 3,110
Unpaid Principal Balance 1,386 3,061
Related Allowance 208 376
Average Recorded Investment 1,588 2,444
Interest Income Recognized 41 175
Residential 1-4 Family [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 631 1,891
Unpaid Principal Balance 626 1,854
Average Recorded Investment 817 1,081
Interest Income Recognized 19 114
Residential 1-4 Family [Member] | With Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 769 1,219
Unpaid Principal Balance 760 1,207
Related Allowance 208 376
Average Recorded Investment 771 1,363
Interest Income Recognized 22 61
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 10,569 6,483
Unpaid Principal Balance 12,263 8,999
Related Allowance 711 1,135
Average Recorded Investment 10,256 11,739
Interest Income Recognized 89 297
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 6,120 1,352
Unpaid Principal Balance 6,120 2,188
Average Recorded Investment 5,628 5,984
Interest Income Recognized (9) 95
Commercial Real Estate [Member] | With Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 4,449 5,131
Unpaid Principal Balance 6,143 6,811
Related Allowance 711 1,135
Average Recorded Investment 4,628 5,755
Interest Income Recognized 98 202
Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment   2,488
Construction [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment   673
Construction [Member] | With Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment   1,815
Farmland [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 575 702
Unpaid Principal Balance 575 701
Related Allowance   120
Average Recorded Investment 575 767
Interest Income Recognized   7
Farmland [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 575  
Unpaid Principal Balance 575  
Average Recorded Investment 288  
Farmland [Member] | With Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   702
Unpaid Principal Balance   701
Related Allowance   120
Average Recorded Investment $ 287 767
Interest Income Recognized   7
Second Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   281
Unpaid Principal Balance   280
Average Recorded Investment   222
Interest Income Recognized   3
Second Mortgages [Member] | With No Related Allowance Recorded [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment   281
Unpaid Principal Balance   280
Average Recorded Investment   222
Interest Income Recognized   $ 3