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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Allowance for loan losses:          
Balance at beginning of year     $ 10,644 $ 13,075 $ 13,075
Charge-offs     (847) (4,300) (4,492)
Recoveries     619 575 2,486
Provision for (recovery of) loan losses (100) 275 (700) 2,525 (425)
Balance at end of period 9,716 11,875 9,716 11,875 10,644
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 1,709 1,081 1,709 1,081 1,379
Allowance for loan losses, Collectively evaluated for impairment 8,007 10,794 8,007 10,794 9,265
Loans:          
Ending Balance 374,690 366,827 374,690 366,827 357,093
Loans, Individually evaluated for impairment 16,843 17,590 16,843 17,590 21,694
Loans, Collectively evaluated for impairment 357,847 349,237 357,847 349,237 335,399
Construction and Land Development [Member]
          
Allowance for loan losses:          
Balance at beginning of year     2,710 2,481 2,481
Charge-offs     (91) (2,923) (2,962)
Recoveries     79    
Provision for (recovery of) loan losses     (832) 3,385 3,191
Balance at end of period 1,866 2,943 1,866 2,943 2,710
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 626 743 626 743 882
Allowance for loan losses, Collectively evaluated for impairment 1,240 2,200 1,240 2,200 1,828
Loans:          
Ending Balance 29,862 34,404 29,862 34,404 34,060
Loans, Individually evaluated for impairment 3,382 7,217 3,382 7,217 6,862
Loans, Collectively evaluated for impairment 26,480 27,187 26,480 27,187 27,198
Secured by 1-4 Family Residential [Member]
          
Allowance for loan losses:          
Balance at beginning of year     2,975 3,712 3,712
Charge-offs     (259) (260) (260)
Recoveries     10 47 823
Provision for (recovery of) loan losses     185 (332) (1,300)
Balance at end of period 2,911 3,167 2,911 3,167 2,975
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 133 81 133 81 190
Allowance for loan losses, Collectively evaluated for impairment 2,778 3,086 2,778 3,086 2,785
Loans:          
Ending Balance 155,298 142,446 155,298 142,446 141,961
Loans, Individually evaluated for impairment 3,436 3,439 3,436 3,439 3,431
Loans, Collectively evaluated for impairment 151,862 139,007 151,862 139,007 138,530
Other Real Estate [Member]
          
Allowance for loan losses:          
Balance at beginning of year     4,418 6,163 6,163
Charge-offs     (203) (976) (1,070)
Recoveries     340 214 1,304
Provision for (recovery of) loan losses     (131) (89) (1,979)
Balance at end of period 4,424 5,312 4,424 5,312 4,418
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 914 201 914 201 263
Allowance for loan losses, Collectively evaluated for impairment 3,510 5,111 3,510 5,111 4,155
Loans:          
Ending Balance 154,769 156,691 154,769 156,691 145,968
Loans, Individually evaluated for impairment 9,899 6,690 9,899 6,690 11,143
Loans, Collectively evaluated for impairment 144,870 150,001 144,870 150,001 134,825
Commercial and Industrial [Member]
          
Allowance for loan losses:          
Balance at beginning of year     442 608 608
Charge-offs     (43) (31) (37)
Recoveries     16 177 179
Provision for (recovery of) loan losses     (58) (359) (308)
Balance at end of period 357 395 357 395 442
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 36 56 36 56 44
Allowance for loan losses, Collectively evaluated for impairment 321 339 321 339 398
Loans:          
Ending Balance 22,943 21,316 22,943 21,316 22,803
Loans, Individually evaluated for impairment 126 244 126 244 258
Loans, Collectively evaluated for impairment 22,817 21,072 22,817 21,072 22,545
Consumer and Other Loans [Member]
          
Allowance for loan losses:          
Balance at beginning of year     99 111 111
Charge-offs     (251) (110) (163)
Recoveries     174 137 180
Provision for (recovery of) loan losses     136 (80) (29)
Balance at end of period 158 58 158 58 99
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 0   0   0
Allowance for loan losses, Collectively evaluated for impairment 158 58 158 58 99
Loans:          
Ending Balance 11,818 11,970 11,818 11,970 12,301
Loans, Individually evaluated for impairment 0   0   0
Loans, Collectively evaluated for impairment $ 11,818 $ 11,970 $ 11,818 $ 11,970 $ 12,301