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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 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Allowance for loan losses:      
Balance at beginning of year $ 10,644 $ 13,075 $ 13,075
Charge-offs (239) (278) (4,492)
Recoveries 78 209 2,486
Provision for (recovery of) loan losses (200) (250) (425)
Balance at end of period 10,283 12,756 10,644
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 1,538 1,924 1,379
Allowance for loan losses, Collectively evaluated for impairment 8,745 10,832 9,265
Loans:      
Ending Balance 359,533 382,339 357,093
Loans, Individually evaluated for impairment 21,238 19,220 21,694
Loans, Collectively evaluated for impairment 338,295 363,119 335,399
Construction and Land Development [Member]
      
Allowance for loan losses:      
Balance at beginning of year 2,710 2,481 2,481
Charge-offs     (2,962)
Provision for (recovery of) loan losses (458) (84) 3,191
Balance at end of period 2,252 2,397 2,710
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 862 604 882
Allowance for loan losses, Collectively evaluated for impairment 1,390 1,793 1,828
Loans:      
Ending Balance 33,876 45,783 34,060
Loans, Individually evaluated for impairment 6,568 6,098 6,862
Loans, Collectively evaluated for impairment 27,308 39,685 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 (71) (149) (260)
Recoveries 4 2 823
Provision for (recovery of) loan losses 42 134 (1,300)
Balance at end of period 2,950 3,699 2,975
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 126 156 190
Allowance for loan losses, Collectively evaluated for impairment 2,824 3,543 2,785
Loans:      
Ending Balance 147,541 143,765 141,961
Loans, Individually evaluated for impairment 3,468 2,959 3,431
Loans, Collectively evaluated for impairment 144,073 140,806 138,530
Other Real Estate [Member]
      
Allowance for loan losses:      
Balance at beginning of year 4,418 6,163 6,163
Charge-offs   (82) (1,070)
Recoveries 1 7 1,304
Provision for (recovery of) loan losses 89 (263) (1,979)
Balance at end of period 4,508 5,825 4,418
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 505 903 263
Allowance for loan losses, Collectively evaluated for impairment 4,003 4,922 4,155
Loans:      
Ending Balance 142,719 162,742 145,968
Loans, Individually evaluated for impairment 11,030 7,654 11,143
Loans, Collectively evaluated for impairment 131,689 155,088 134,825
Commercial and Industrial [Member]
      
Allowance for loan losses:      
Balance at beginning of year 442 608 608
Charge-offs (36)   (37)
Recoveries 1 139 179
Provision for (recovery of) loan losses 36 (4) (308)
Balance at end of period 443 743 442
Ending Balance:      
Allowance for loan losses, Individually evaluated for impairment 45 261 44
Allowance for loan losses, Collectively evaluated for impairment 398 482 398
Loans:      
Ending Balance 23,381 22,743 22,803
Loans, Individually evaluated for impairment 172 2,509 258
Loans, Collectively evaluated for impairment 23,209 20,234 22,545
Consumer and Other Loans [Member]
      
Allowance for loan losses:      
Balance at beginning of year 99 111 111
Charge-offs (132) (47) (163)
Recoveries 72 61 180
Provision for (recovery of) loan losses 91 (33) (29)
Balance at end of period 130 92 99
Ending Balance:      
Allowance for loan losses, Collectively evaluated for impairment 130 92 99
Loans:      
Ending Balance 12,016 7,306 12,301
Loans, Collectively evaluated for impairment $ 12,016 $ 7,306 $ 12,301