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Subordinated Debt (Detail) - USD ($)
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
[1]
May. 28, 2015
Debt and Financial Instruments [Line Items]      
Subordinated debt, net of issuance costs $ 6,848,000 $ 6,844,000  
Subordinated Debt Due May 2025      
Debt and Financial Instruments [Line Items]      
Debt instrument, face amount 7,000,000   $ 7,000,000
Less: Issuance costs (152,000)    
Subordinated debt, net of issuance costs $ 6,848,000    
[1] Derived from Audited December 31, 2015 Financial Statements.