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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details 4) - Nonrecurring Fair Value Measurements [Member] - Significant Unobservable Inputs (Level 3) [Member] - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Impaired Loans [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Estimate	$ 7,031	$ 4,414
Range and weighted average of appraisal adjustments	(58.00%)	(24.50%)
Range and weighted average of liquidation expenses	(5.40%)	(5.50%)
Impaired Loans [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	3.00%	2.60%
Range and weighted average of liquidation expenses	3.00%	3.00%
Impaired Loans [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	77.00%	61.10%
Range and weighted average of liquidation expenses	6.00%	6.00%
Other Real Estate Owned [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Assets, Fair Value Estimate	$ 348	$ 218
Range and weighted average of appraisal adjustments	(42.40%)	(30.50%)
Range and weighted average of liquidation expenses	(5.00%)	(5.00%)
Other Real Estate Owned [Member] | Minimum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	20.00%	19.70%
Range and weighted average of liquidation expenses	3.00%	3.00%
Other Real Estate Owned [Member] | Maximum [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Range and weighted average of appraisal adjustments	77.90%	47.80%
Range and weighted average of liquidation expenses	6.00%	6.00%

X

- Definition

Represents the range and weighted average of appraisal adjustments presented as a percent of the appraisal.

+ References

No definition available.

+ Details

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- Definition

Represents the range and weighted average of liquidation expenses presented as a percent of the appraisal.

+ References

No definition available.

+ Details

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X

- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 820



-SubTopic 10



-Section 50



-Paragraph 2



-Subparagraph (a)



-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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