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Off-Balance Sheet Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] |  |
Commitments to extend credit | $ 223,710 | $ 216,179
Commitments related to secondary market mortgage loans | 2,948 | 3,677
Standby letters of credit and financial guarantees | 3,378 | 4,193
Total off-balance sheet risk | 230,036 | 224,049
Reserve for unfunded commitments | $ 326 | $ 326

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