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Aggregate Contractual or Notional Amounts of Derivative Financial Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Jun. 30, 2014
Derivatives Not Designated As Hedges
Dec. 31, 2013
Derivatives Not Designated As Hedges
Jun. 30, 2013
Derivatives Not Designated As Hedges
Feb. 28, 2014
Interest Rate Swaps Agreement
Oct. 31, 2013
Interest Rate Swaps Agreement
Jun. 30, 2014
Interest Rate Swaps Agreement
Designated as Hedging Instrument
Dec. 31, 2013
Interest Rate Swaps Agreement
Designated as Hedging Instrument
Jun. 30, 2014
IRLCs
Derivatives Not Designated As Hedges
Dec. 31, 2013
IRLCs
Derivatives Not Designated As Hedges
Jun. 30, 2013
IRLCs
Derivatives Not Designated As Hedges
Jun. 30, 2014
Forward Sale Loan Commitments
Derivatives Not Designated As Hedges
Dec. 31, 2013
Forward Sale Loan Commitments
Derivatives Not Designated As Hedges
Derivative [Line Items]                              
Notional or Contractual Amount $ 13,707 $ 11,690 $ 9,072 $ 5,787 $ 8,237 $ 9,072 $ 4,340 $ 3,500 $ 7,920 $ 3,453 $ 2,664 $ 3,677 $ 9,072 $ 3,123 $ 4,560