Loans - Pre-Modification and Post-Modification Outstanding Recorded Investments (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Contract	Dec. 31, 2013 Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	42	82
Pre-Modification Outstanding Recorded Investment	$ 43,926	$ 67,046
Post-Modification Outstanding Recorded Investment	37,073	62,795
Commercial and industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	12	16
Pre-Modification Outstanding Recorded Investment	12,057	27,415
Post-Modification Outstanding Recorded Investment	10,793	22,718
Commercial real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	12	13
Pre-Modification Outstanding Recorded Investment	17,817	13,788
Post-Modification Outstanding Recorded Investment	13,967	13,818
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	4	8
Pre-Modification Outstanding Recorded Investment	6,339	16,682
Post-Modification Outstanding Recorded Investment	4,731	18,133
Commercial real estate loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	16	21
Pre-Modification Outstanding Recorded Investment	24,156	30,470
Post-Modification Outstanding Recorded Investment	18,698	31,951
Residential mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	9	38
Pre-Modification Outstanding Recorded Investment	5,662	8,661
Post-Modification Outstanding Recorded Investment	5,348	7,681
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts	5	7
Pre-Modification Outstanding Recorded Investment	2,051	500
Post-Modification Outstanding Recorded Investment	$ 2,234	$ 445

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=35738203&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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- Definition

Pre-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

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