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Off-Balance Sheet Commitments - Distribution of Undisbursed Loan Commitments (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 330,871 | $ 273,537
Commitments to extend credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 310,987 | 262,680
Standby letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | 15,669 | 6,839
Commercial letters of credit [Member] |  |
Loss Contingencies [Line Items] |  |
Total undisbursed loan commitments | $ 4,215 | $ 4,018

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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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