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Derivative Financial Instruments and Hedging Transactions - Schedule of Fair Values and Notional Amounts of Company's Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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| Interest Rate Swaps Designated As Fair Value Hedges [Member] | Other Liabilities [Member] |
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| Derivative [Line Items] |
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| Total derivative liabilities fair value |
$ (417) |
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| Total derivative liabilities notional amount |
16,674 |
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| Interest Rate Swaps Designated As Fair Value Hedges [Member] | Other Assets [Member] |
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| Derivative [Line Items] |
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| Total derivative assets fair value |
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62 |
| Total derivative assets notional amount |
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17,264 |
| Interest Rate Swaps With Customers [Member] | Other Liabilities [Member] |
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| Derivative [Line Items] |
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| Total derivative liabilities fair value |
(7) |
(352) |
| Total derivative liabilities notional amount |
9,646 |
10,018 |
| Reciprocal Interest Rate Swaps [Member] | Other Assets [Member] |
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| Derivative [Line Items] |
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| Total derivative assets fair value |
7 |
352 |
| Total derivative assets notional amount |
$ 9,646 |
$ 10,018 |