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Loans Receivable and Allowance for Loan Losses - Summary of Allowance for Loan Loss Allocation (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment $ 14,358   $ 25,335      
Loans, Collectively evaluated for impairment 666,016   645,702      
Total Loans 680,374   671,037      
Allowance for loan losses, Individually evaluated for impairment 203   613      
Allowance for loan losses, Collectively evaluated for impairment 15,816   20,352      
Allowance for loan losses, Total 16,019 20,425 20,965 21,252 20,098 23,166
Commercial Real Estate [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 7,315   16,494      
Loans, Collectively evaluated for impairment 307,592   308,903      
Total Loans 314,907   325,397      
Allowance for loan losses, Individually evaluated for impairment 69   552      
Allowance for loan losses, Collectively evaluated for impairment 9,933   12,663      
Allowance for loan losses, Total 10,002 14,053 13,215 13,061 11,288 13,719
Acquisition and Development [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 1,249   3,177      
Loans, Collectively evaluated for impairment 19,528   19,601      
Total Loans 20,777   22,778      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 535   670      
Allowance for loan losses, Total 535 852 670 1,094 1,946 3,502
Commercial and Industrial [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 694   2,001      
Loans, Collectively evaluated for impairment 44,431   31,445      
Total Loans 45,125   33,446      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 922   864      
Allowance for loan losses, Total 922 993 864 754 875 1,635
Municipal [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 62,385   60,996      
Total Loans 62,385   60,996      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 187   244      
Allowance for loan losses, Total 187 178 244 242 254 223
Commercial [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 9,258   21,672      
Loans, Collectively evaluated for impairment 433,936   420,945      
Total Loans 443,194   442,617      
Allowance for loan losses, Individually evaluated for impairment 69   552      
Allowance for loan losses, Collectively evaluated for impairment 11,577   14,441      
Allowance for loan losses, Total 11,646 16,076 14,993 15,151 14,363 19,079
Residential Mortgage [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 5,083   3,663      
Loans, Collectively evaluated for impairment 225,975   218,573      
Total Loans 231,058   222,236      
Allowance for loan losses, Individually evaluated for impairment 134   61      
Allowance for loan losses, Collectively evaluated for impairment 2,020   3,719      
Allowance for loan losses, Total 2,154 2,362 3,780 3,898 3,796 2,275
Installment and Other Loans [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 17   0      
Loans, Collectively evaluated for impairment 6,105   6,184      
Total Loans 6,122   6,184      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 201   124      
Allowance for loan losses, Total 201 186 124 126 134 85
Consumer [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 5,100   3,663      
Loans, Collectively evaluated for impairment 232,080   224,757      
Total Loans 237,180   228,420      
Allowance for loan losses, Individually evaluated for impairment 134   61      
Allowance for loan losses, Collectively evaluated for impairment 2,221   3,843      
Allowance for loan losses, Total 2,355 2,548 3,904 4,024 3,930 2,360
Unallocated [Member]
           
Financing Receivable, Allowance for Credit Losses [Line Items]            
Loans, Individually evaluated for impairment 0   0      
Loans, Collectively evaluated for impairment 0   0      
Total Loans 0   0      
Allowance for loan losses, Individually evaluated for impairment 0   0      
Allowance for loan losses, Collectively evaluated for impairment 2,018   2,068      
Allowance for loan losses, Total $ 2,018 $ 1,801 $ 2,068 $ 2,077 $ 1,805 $ 1,727