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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Feb. 28, 2014
Oct. 31, 2013
Derivative [Line Items]            
Notional or Contractual Amount $ 15,852   $ 8,937 $ 14,861    
Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount 10,373   4,574 7,042    
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 5,479   4,363 7,819    
IRLCs | Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount 4,925   1,391 2,948    
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges            
Derivative [Line Items]            
Notional or Contractual Amount $ 5,448   $ 3,183 $ 4,094