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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Feb. 28, 2014
Oct. 31, 2013
Derivative [Line Items]            
Notional or Contractual Amount $ 15,183   $ 8,937 $ 13,707    
Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount 9,771   4,574 5,787    
Interest Rate Swaps Agreement            
Derivative [Line Items]            
Notional or Contractual Amount   $ 1,200     $ 4,370 $ 3,500
Interest Rate Swaps Agreement | Designated as Hedging Instrument            
Derivative [Line Items]            
Notional or Contractual Amount 5,412   4,363 7,920    
IRLCs | Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount 4,425   1,391 2,664    
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount $ 5,346   $ 3,183 $ 3,123