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Premises and equipment, net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment [Line Items]
Depreciation and amortization	$ 1,671us-gaap_DepreciationAmortizationAndAccretionNet	$ 924us-gaap_DepreciationAmortizationAndAccretionNet	$ 855us-gaap_DepreciationAmortizationAndAccretionNet
Rent expense	$ 343us-gaap_LeaseAndRentalExpense	$ 216us-gaap_LeaseAndRentalExpense	$ 103us-gaap_LeaseAndRentalExpense
Minimum [Member]
Property, Plant and Equipment [Line Items]
Leases extension period	1 year
Maximum [Member]
Property, Plant and Equipment [Line Items]
Leases extension period	10 years

X

- Definition

Lease Optional Extension Period

+ References

No definition available.

+ Details

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- Definition

The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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