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Aggregate Contractual or Notional Amounts and Fair Value of Derivative Financial Instruments (Detail) - USD ($)
Dec. 31, 2015
Mar. 31, 2015
Dec. 31, 2014
Feb. 28, 2014
Oct. 31, 2013
Derivative [Line Items]          
Notional or Contractual Amount $ 5,335,000   $ 8,937,000    
Derivative Assets     5,000    
Derivative Liabilities 251,000   214,000    
Derivatives Not Designated As Hedges          
Derivative [Line Items]          
Notional or Contractual Amount     4,574,000    
Derivative Assets     5,000    
Derivative Liabilities     5,000    
IRLCs | Derivatives Not Designated As Hedges          
Derivative [Line Items]          
Notional or Contractual Amount     1,391,000    
Derivative Assets     5,000    
Interest Rate Swaps Agreement          
Derivative [Line Items]          
Notional or Contractual Amount   $ 1,200,000   $ 4,370,000 $ 3,500,000
Interest Rate Swaps Agreement | Designated as Hedging Instrument          
Derivative [Line Items]          
Notional or Contractual Amount 5,335,000   4,363,000    
Derivative Liabilities $ 251,000   209,000    
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges          
Derivative [Line Items]          
Notional or Contractual Amount     3,183,000    
Derivative Liabilities     $ 5,000