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Notional or Contractual Amounts and Fair Value of Derivative Instruments (Detail) - USD ($) | Dec. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015 | Feb. 28, 2014
--- | --- | --- | --- | ---
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount | $ 4,835,000 | $ 5,151,000 |  |
Derivative Assets | 0 | 0 |  |
Derivative liabilities | 167,000 | 251,000 |  |
Interest Rate Swaps Agreement |  |  |  |
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount |  |  | $ 1,200,000 | $ 4,370,000
Interest Rate Swaps Agreement | Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Notional or Contractual Amount | 4,835,000 | 5,151,000 |  |
Derivative Assets | 0 | 0 |  |
Derivative liabilities | $ 167,000 | $ 251,000 |  |

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