Loans - Troubled Debt Restructurings (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Contract	Dec. 31, 2013 Contract	Dec. 31, 2012 Contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	9	7
Pre-Modification Outstanding Recorded Investment	$ 837	$ 11,581	$ 10,851
Post-Modification Outstanding Recorded Investment	837	11,581	10,851
Related Allowance	50	1,264	1,297
Real Estate, Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	6	3
Pre-Modification Outstanding Recorded Investment	837	10,012	9,054
Post-Modification Outstanding Recorded Investment	837	10,012	9,054
Related Allowance	50	994	957
Real Estate, Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		2	3
Pre-Modification Outstanding Recorded Investment		891	1,095
Post-Modification Outstanding Recorded Investment		891	1,095
Related Allowance		270	340
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts		1	1
Pre-Modification Outstanding Recorded Investment		678	702
Post-Modification Outstanding Recorded Investment		$ 678	$ 702

Amount of allowance for credit losses related to receivables which had been measured under a general allowance for credit losses methodology that are now identified as troubled debt restructurings.

No definition available.

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- Definition

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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