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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 6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Allowance for loan losses:          
Balance at beginning of year     $ 10,644 $ 13,075 $ 13,075
Charge-offs     (545) (3,345) (4,492)
Recoveries     507 498 2,486
Provision for (recovery of) loan losses (400) 2,500 (600) 2,250 (425)
Balance at end of period 10,006 12,478 10,006 12,478 10,644
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 1,873 1,122 1,873 1,122 1,379
Allowance for loan losses, Collectively evaluated for impairment 8,133 11,356 8,133 11,356 9,265
Loans:          
Ending Balance 367,490 377,513 367,490 377,513 357,093
Loans, Individually evaluated for impairment 19,882 10,844 19,882 10,844 21,694
Loans, Collectively evaluated for impairment 347,608 366,669 347,608 366,669 335,399
Construction and Land Development [Member]
          
Allowance for loan losses:          
Balance at beginning of year     2,710 2,481 2,481
Charge-offs       (2,308) (2,962)
Recoveries     40    
Provision for (recovery of) loan losses     (636) 3,097 3,191
Balance at end of period 2,114 3,270 2,114 3,270 2,710
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 779 747 779 747 882
Allowance for loan losses, Collectively evaluated for impairment 1,335 2,523 1,335 2,523 1,828
Loans:          
Ending Balance 32,795 44,305 32,795 44,305 34,060
Loans, Individually evaluated for impairment 6,427 3,595 6,427 3,595 6,862
Loans, Collectively evaluated for impairment 26,368 40,710 26,368 40,710 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     (104) (172) (260)
Recoveries     7 6 823
Provision for (recovery of) loan losses     18 179 (1,300)
Balance at end of period 2,896 3,725 2,896 3,725 2,975
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 126 195 126 195 190
Allowance for loan losses, Collectively evaluated for impairment 2,770 3,530 2,770 3,530 2,785
Loans:          
Ending Balance 151,043 145,628 151,043 145,628 141,961
Loans, Individually evaluated for impairment 3,297 1,940 3,297 1,940 3,431
Loans, Collectively evaluated for impairment 147,746 143,688 147,746 143,688 138,530
Other Real Estate [Member]
          
Allowance for loan losses:          
Balance at beginning of year     4,418 6,163 6,163
Charge-offs     (203) (798) (1,070)
Recoveries     339 206 1,304
Provision for (recovery of) loan losses     (167) (561) (1,979)
Balance at end of period 4,387 5,010 4,387 5,010 4,418
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 911 161 911 161 263
Allowance for loan losses, Collectively evaluated for impairment 3,476 4,849 3,476 4,849 4,155
Loans:          
Ending Balance 146,483 159,834 146,483 159,834 145,968
Loans, Individually evaluated for impairment 9,994 5,219 9,994 5,219 11,143
Loans, Collectively evaluated for impairment 136,489 154,615 136,489 154,615 134,825
Commercial and Industrial [Member]
          
Allowance for loan losses:          
Balance at beginning of year     442 608 608
Charge-offs     (36)   (37)
Recoveries     3 176 179
Provision for (recovery of) loan losses     65 (399) (308)
Balance at end of period 474 385 474 385 442
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment 57 19 57 19 44
Allowance for loan losses, Collectively evaluated for impairment 417 366 417 366 398
Loans:          
Ending Balance 24,797 19,701 24,797 19,701 22,803
Loans, Individually evaluated for impairment 164 90 164 90 258
Loans, Collectively evaluated for impairment 24,633 19,611 24,633 19,611 22,545
Consumer and Other Loans [Member]
          
Allowance for loan losses:          
Balance at beginning of year     99 111 111
Charge-offs     (202) (67) (163)
Recoveries     118 110 180
Provision for (recovery of) loan losses     120 (66) (29)
Balance at end of period 135 88 135 88 99
Ending Balance:          
Allowance for loan losses, Individually evaluated for impairment               
Allowance for loan losses, Collectively evaluated for impairment 135 88 135 88 99
Loans:          
Ending Balance 12,372 8,045 12,372 8,045 12,301
Loans, Individually evaluated for impairment               
Loans, Collectively evaluated for impairment $ 12,372 $ 8,045 $ 12,372 $ 8,045 $ 12,301