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Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Allowance for loan losses:      
Balance at beginning of year $ 13,075 $ 12,937 $ 12,937
Charge-offs (4,300) (2,583) (3,793)
Recoveries 575 240 376
Provision for (recovery of) loan losses 2,525 3,455 3,555
Balance at end of period 11,875 14,049 13,075
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 1,081 3,239 1,838
Allowance for loan losses, Collectively evaluated for impairment 10,794 10,810 11,237
Loans      
Total 366,827 380,752 383,594
Loans, Individually evaluated for impairment 17,590 19,872 16,980
Loans, Collectively evaluated for impairment 349,237 360,880 366,614
Construction and Land Development [Member]
      
Allowance for loan losses:      
Balance at beginning of year 2,481 2,843 2,843
Charge-offs (2,923) (369) (431)
Recoveries   1 1
Provision for (recovery of) loan losses 3,385 1,059 68
Balance at end of period 2,943 3,534 2,481
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 743 1,728 567
Allowance for loan losses, Collectively evaluated for impairment 2,200 1,806 1,914
Loans      
Total 34,404 44,725 43,524
Loans, Individually evaluated for impairment 7,217 6,353 2,516
Loans, Collectively evaluated for impairment 27,187 38,372 41,008
Secured by 1-4 Family Residential [Member]
      
Allowance for loan losses:      
Balance at beginning of year 3,712 3,766 3,766
Charge-offs (260) (761) (761)
Recoveries 47 2 68
Provision for (recovery of) loan losses (332) 992 639
Balance at end of period 3,167 3,999 3,712
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 81 709 306
Allowance for loan losses, Collectively evaluated for impairment 3,086 3,290 3,406
Loans      
Total 142,446 128,354 134,964
Loans, Individually evaluated for impairment 3,439 4,758 3,776
Loans, Collectively evaluated for impairment 139,007 123,596 131,188
Other Real Estate [Member]
      
Allowance for loan losses:      
Balance at beginning of year 6,163 5,192 5,192
Charge-offs (976) (1,042) (2,154)
Recoveries 214 58 64
Provision for (recovery of) loan losses (89) 1,531 3,061
Balance at end of period 5,312 5,739 6,163
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 201 762 930
Allowance for loan losses, Collectively evaluated for impairment 5,111 4,977 5,233
Loans      
Total 156,691 175,122 176,573
Loans, Individually evaluated for impairment 6,690 8,597 10,528
Loans, Collectively evaluated for impairment 150,001 166,525 166,045
Commercial and Industrial [Member]
      
Allowance for loan losses:      
Balance at beginning of year 608 963 963
Charge-offs (31) (261) (261)
Recoveries 177 24 35
Provision for (recovery of) loan losses (359) (75) (129)
Balance at end of period 395 651 608
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 56 40 35
Allowance for loan losses, Collectively evaluated for impairment 339 611 573
Loans      
Total 21,316 24,216 20,718
Loans, Individually evaluated for impairment 244 164 160
Loans, Collectively evaluated for impairment 21,072 24,052 20,558
Consumer and Other Loans [Member]
      
Allowance for loan losses:      
Balance at beginning of year 111 173 173
Charge-offs (110) (150) (186)
Recoveries 137 155 208
Provision for (recovery of) loan losses (80) (52) (84)
Balance at end of period 58 126 111
Ending Balance:      
Allowance for loan losses, Collectively evaluated for impairment 58 126 111
Loans      
Total 11,970 8,335 7,815
Loans, Collectively evaluated for impairment $ 11,970 $ 8,335 $ 7,815