Loans - Additional Information (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan portfolio segments \| Segment	3
Deferred loan fees	$ 3,740	$ 3,390

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.

No definition available.

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration