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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 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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