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Fair Values of Company's Derivatives (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Derivative [Line Items]      
Derivative Assets $ 27 $ 5 $ 7
Derivative Liabilities 345 214 196
Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets 27 5 7
Derivative Liabilities 27 5 7
Interest Rate Swaps Agreement | Designated as Hedging Instrument      
Derivative [Line Items]      
Derivative Liabilities 318 209 189
IRLCs | Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets 27 5  
Derivative Liabilities     7
Forward Sale Loan Commitments | Derivatives Not Designated As Hedges      
Derivative [Line Items]      
Derivative Assets     $ 7
Derivative Liabilities $ 27 $ 5