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Total Allowance by Loan Segment (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Provision for credit losses $ 260,000 $ 100,000 $ 150,000 $ 288,000 $ 150,000 $ 225,000 $ 260,000 $ 250,000 $ 663,000
Individually evaluated for impairment, Balance in allowance 1,163,567           1,163,567    
Loans Receivable
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           3,399,516 3,307,920 3,930,924 3,399,516
Provision for credit losses             260,000 250,000 663,000
Recoveries             437,502 392,275 484,804
Loans charged off             (1,033,403) (1,265,279) (616,396)
Balance, end of year 2,972,019 3,307,920   3,930,924     2,972,019 3,307,920 3,930,924
Individually evaluated for impairment, Balance in allowance 1,163,567 1,314,777   2,553,104     1,163,567 1,314,777 2,553,104
Individually evaluated for impairment, Related loan balance 5,908,796 7,398,293   10,876,258     5,908,796 7,398,293 10,876,258
Collectively evaluated for impairment, Balance in allowance 1,808,452 1,993,143   1,377,820     1,808,452 1,993,143 1,377,820
Collectively evaluated for impairment, Balance in allowance 268,918,682 246,624,399   226,847,222     268,918,682 246,624,399 226,847,222
Loans Receivable | Commercial and Industrial
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           263,251 541,916 557,169 263,251
Provision for credit losses             46,303 29,282 295,525
Recoveries             26,804 10,558 4,010
Loans charged off             (202,114) (55,093) (5,617)
Balance, end of year 412,909 541,916   557,169     412,909 541,916 557,169
Individually evaluated for impairment, Balance in allowance 278,786 451,126   455,735     278,786 451,126 455,735
Individually evaluated for impairment, Related loan balance 278,786 796,511   1,248,279     278,786 796,511 1,248,279
Collectively evaluated for impairment, Balance in allowance 134,123 90,790   101,434     134,123 90,790 101,434
Collectively evaluated for impairment, Balance in allowance 3,893,961 4,104,596   5,944,795     3,893,961 4,104,596 5,944,795
Loans Receivable | Commercial Real Estate
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           2,108,223 1,183,240 2,012,962 2,108,223
Provision for credit losses             (374,067) (919,161) (165,691)
Recoveries             89,189 89,439 70,430
Loans charged off                     
Balance, end of year 898,362 1,183,240   2,012,962     898,362 1,183,240 2,012,962
Individually evaluated for impairment, Balance in allowance 550,794 807,735   1,641,711     550,794 807,735 1,641,711
Individually evaluated for impairment, Related loan balance 3,364,193 4,980,503   7,538,638     3,364,193 4,980,503 7,538,638
Collectively evaluated for impairment, Balance in allowance 347,568 375,505   371,251     347,568 375,505 371,251
Collectively evaluated for impairment, Balance in allowance 65,414,415 67,898,601   63,535,256     65,414,415 67,898,601 63,535,256
Loans Receivable | Consumer and Indirect
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           829,517 1,057,531 888,614 829,517
Provision for credit losses             468,559 357,622 256,886
Recoveries             313,795 286,564 408,889
Loans charged off             (652,281) (475,269) (606,678)
Balance, end of year 1,187,604 1,057,531   888,614     1,187,604 1,057,531 888,614
Individually evaluated for impairment, Balance in allowance 178,657 20,000   44,235     178,657 20,000 44,235
Individually evaluated for impairment, Related loan balance 636,174 76,251   125,455     636,174 76,251 125,455
Collectively evaluated for impairment, Balance in allowance 1,008,947 1,037,531   844,379     1,008,947 1,037,531 844,379
Collectively evaluated for impairment, Balance in allowance 72,594,259 66,020,034   49,992,575     72,594,259 66,020,034 49,992,575
Loans Receivable | Residential Real Estate
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           196,275 392,506 595,812 196,275
Provision for credit losses             372,251 525,897 402,163
Recoveries             7,714 5,714 1,475
Loans charged off             (179,008) (734,917) (4,101)
Balance, end of year 593,463 392,506   595,812     593,463 392,506 595,812
Individually evaluated for impairment, Balance in allowance 155,330 35,916   411,423     155,330 35,916 411,423
Individually evaluated for impairment, Related loan balance 1,629,643 1,545,028   1,963,886     1,629,643 1,545,028 1,963,886
Collectively evaluated for impairment, Balance in allowance 438,133 356,590   184,389     438,133 356,590 184,389
Collectively evaluated for impairment, Balance in allowance 127,016,047 108,601,168   107,374,596     127,016,047 108,601,168 107,374,596
Loans Receivable | Unallocated
                  
Financing Receivable, Allowance for Credit Losses [Line Items]                  
Balance, beginning of year           2,250 132,727 (123,633) 2,250
Provision for credit losses             (253,046) 256,360 (125,883)
Recoveries                     
Loans charged off                     
Balance, end of year (120,319) 132,727   (123,633)     (120,319) 132,727 (123,633)
Individually evaluated for impairment, Balance in allowance                        
Individually evaluated for impairment, Related loan balance                        
Collectively evaluated for impairment, Balance in allowance (120,319) 132,727   (123,633)     (120,319) 132,727 (123,633)
Collectively evaluated for impairment, Balance in allowance