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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 280,773 | $ 325,612
Commitments to extend credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 270,702 | 309,584
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 5,426 | 8,982
Commercial letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 4,645 | $ 7,046

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- Definition Undisbursed loan commitments. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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- Details
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- Details
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