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Non-performing Loans and Impaired Loans - Loans Transferred and Classified as Troubled Debt Restructured Loans Non-accrual (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) Defaults	Jun. 30, 2014 USD ($) Defaults	Jun. 30, 2015 USD ($) Defaults	Jun. 30, 2014 USD ($) Defaults
Financing Receivable, Modifications [Line Items]
Number of Defaults	2	2	3	6
Unpaid Principal Balance | $	$ 113	$ 274	$ 2,465	$ 944
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults			1	2
Unpaid Principal Balance | $			$ 2,352	$ 371
Commercial [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults				2
Unpaid Principal Balance | $				$ 371
Commercial [Member] | Owner Occupied Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults			1
Unpaid Principal Balance | $			$ 2,352
Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	1	1	2
Unpaid Principal Balance | $	$ 81	$ 223	$ 81	$ 377
Real Estate [Member] | Residential Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	1	1	2
Unpaid Principal Balance | $	$ 81	$ 223	$ 81	$ 377
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	1	1	2
Unpaid Principal Balance | $	$ 32	$ 51	$ 32	$ 196
Consumer [Member] | Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Defaults	1	1	1	2
Unpaid Principal Balance | $	$ 32	$ 51	$ 32	$ 196

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+ References

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- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 34



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 310



-SubTopic 10



-Section 50



-Paragraph 34



-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

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