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Aggregate Contractual or Notional Amounts and Fair Value of Derivative Financial Instruments (Detail) - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Mar. 31, 2015
Feb. 28, 2014
Derivative [Line Items]        
Notional or Contractual Amount $ 4,944,000 $ 5,151,000    
Derivative Assets 0 0    
Derivative Liabilities 450,000 251,000    
Interest Rate Swaps Agreement        
Derivative [Line Items]        
Notional or Contractual Amount     $ 1,200,000 $ 4,370,000
Interest Rate Swaps Agreement | Designated as Hedging Instrument        
Derivative [Line Items]        
Notional or Contractual Amount 4,944,000 5,151,000    
Derivative Assets 0 0    
Derivative Liabilities $ 450,000 $ 251,000