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Loans, net and allowance for loan losses - Summary of Changes in Accretible Yield and Nonaccretible Difference of Acquired Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Receivables [Abstract]
Beginning Balance, Accretible
Additions, Accretible	934
Amortization, Accretible	(39)
Charge-offs, Accretible
Payments, Accretible
Ending Balance, Accretible	895
Beginning Balance, Nonaccretible		211	229
Additions, Nonaccretible	6,892
Amortization, Nonaccretible
Charge-offs, Nonaccretible
Payments, Nonaccretible		(211)	(18)
Ending Balance, Nonaccretible	$ 6,892		$ 211

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Amount of the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 30

-Section 15

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

-Publisher FASB

-Name Accounting Standards Codification

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-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538



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