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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Reserve requirements $ 13,601,000       $ 16,466,000       $ 13,601,000 $ 16,466,000  
Securities held for trading purposes 0       0       0 0  
Mortgage loans held for sale 1,951,345       5,627,104       1,951,345 5,627,104  
Outstanding loans sold to government agencies 119,922,000       133,107,000       119,922,000 133,107,000 136,525,000
Number of days for accrual interest to be discontinued and reversed against current income                 90 days    
Amount of losses incurred on Covered Assets 41,000,000               41,000,000    
Percentage acquired by FDIC in first amount losses covered assets 80.00%               80.00%    
Percentage of losses on Covered Assets 95.00%               95.00%    
Period for appraises of property                 12 months    
Noncovered Repossessed assets                 1,406,000 3,771,000  
Repossessed Assets 4,566,000       6,454,000       4,566,000 6,454,000  
Maximum limit of realized on examination                 50.00%    
Income tax expense 919,000 1,244,000 621,000 952,000 1,116,000 1,506,000 912,000 1,071,000 3,736,138 4,604,930 2,635,411
Income tax interest or penalties                 0 0 0
Accrued liability for interest or penalty payments 0       0       0 0 0
Tax effect on unrealized gains on investment securities                 (1,413,095) 853,987 474,623
Tax effect on reclassification adjustment in net income                 (149,870) (75,406) 58,068
Servicing Contracts [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Amortization of intangibles                 10 years    
Government [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Outstanding loans sold to government agencies 119,922,000       133,107,000       119,922,000 133,107,000  
Accounting Standards Update Two Thousand Twelve And Zero Six [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Amortization of indemnification asset                 $ 1,800,000    
Minimum [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Estimated useful lives of the individual assets                 3 years    
Minimum [Member] | Core Deposits [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Amortization of intangibles                 9 years    
Maximum [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Estimated useful lives of the individual assets                 40 years    
Maximum [Member] | Core Deposits [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
Amortization of intangibles                 10 years    
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member]
                      
Schedule Of Summary Of Significant Accounting Policies [Line Items]                      
FHLB par value                 $ 100