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Loan Receivables and Allowance for Loan Losses - Allowance for Loan Losses to Loan Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year $ 5,681 $ 6,016 $ 6,016
Charge-offs (217) (306) (306)
Recoveries 16 37 363
Provision    (30) 970
Balance, end of period 5,480 5,717 5,681
Ending balance: individually evaluated for impairment 1,800   1,891
Ending balance: collectively evaluated for impairment 3,680   3,790
Total Allowance for Loan Losses 5,480 5,717 5,681
Total Loans ending balance 419,838   423,058
Ending balance: individually evaluated for impairment 20,933   21,993
Ending balance: collectively evaluated for impairment 398,905   401,065
Commercial [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 2,285 942 942
Charge-offs (9)   (63)
Recoveries      4
Provision 95   1,402
Balance, end of period 2,371   2,285
Ending balance: individually evaluated for impairment 1,500   1,500
Ending balance: collectively evaluated for impairment 871   785
Total Allowance for Loan Losses 2,371   2,285
Total Loans ending balance 38,752   35,061
Ending balance: individually evaluated for impairment 6,052   6,152
Ending balance: collectively evaluated for impairment 32,700   28,909
Commercial Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 1,585 3,509 3,509
Charge-offs      (403)
Recoveries      335
Provision (265)   (1,856)
Balance, end of period 1,320   1,585
Ending balance: individually evaluated for impairment 17   31
Ending balance: collectively evaluated for impairment 1,303   1,554
Total Allowance for Loan Losses 1,320   1,585
Total Loans ending balance 218,051   223,165
Ending balance: individually evaluated for impairment 8,855   7,767
Ending balance: collectively evaluated for impairment 209,196   215,398
Construction [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 260 311 311
Charge-offs      (205)
Recoveries      20
Provision      134
Balance, end of period 260   260
Ending balance: individually evaluated for impairment 260   260
Ending balance: collectively evaluated for impairment        
Total Allowance for Loan Losses 260   260
Total Loans ending balance 260   260
Ending balance: individually evaluated for impairment 260   260
Ending balance: collectively evaluated for impairment        
Construction to Permanent [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 25 19 19
Charge-offs        
Recoveries        
Provision 9   6
Balance, end of period 34   25
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment 34   25
Total Allowance for Loan Losses 34   25
Total Loans ending balance 12,650   11,303
Ending balance: individually evaluated for impairment      1,197
Ending balance: collectively evaluated for impairment 12,650   10,106
Residential Real Estate [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 795 897 897
Charge-offs (178)   (919)
Recoveries 15   1
Provision 72   816
Balance, end of period 704   795
Ending balance: individually evaluated for impairment 21   98
Ending balance: collectively evaluated for impairment 683   697
Total Allowance for Loan Losses 704   795
Total Loans ending balance 103,019   106,198
Ending balance: individually evaluated for impairment 5,179   6,024
Ending balance: collectively evaluated for impairment 97,840   100,174
Consumer [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 534 217 217
Charge-offs (30)   (78)
Recoveries 1   3
Provision 34   392
Balance, end of period 539   534
Ending balance: individually evaluated for impairment 2   2
Ending balance: collectively evaluated for impairment 537   532
Total Allowance for Loan Losses 539   534
Total Loans ending balance 47,106   47,071
Ending balance: individually evaluated for impairment 587   593
Ending balance: collectively evaluated for impairment 46,519   46,478
Unallocated [Member]
      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Balance, beginning of year 197 121 121
Charge-offs        
Recoveries        
Provision 55   76
Balance, end of period 252   197
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment 252   197
Total Allowance for Loan Losses 252   197
Total Loans ending balance        
Ending balance: individually evaluated for impairment        
Ending balance: collectively evaluated for impairment