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Fair value estimates - Additional Quantitative Information about Assets Measured at Fair Value on Nonrecurring Basis (Details) - Level 3 - Nonrecurring Basis - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other real estate owned
Fair Value Inputs, Assets, Quantitative Information
Assets, Fair Value Estimate	$ 500	$ 216
Range and weighted average of appraisal adjustments	30.60%	30.70%
Range and weighted average of liquidation expenses	5.00%	5.00%
Other real estate owned | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	20.00%	25.00%
Range and weighted average of liquidation expenses	3.00%	3.00%
Other real estate owned | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	43.40%	41.30%
Range and weighted average of liquidation expenses	6.00%	6.00%
Impaired loans
Fair Value Inputs, Assets, Quantitative Information
Assets, Fair Value Estimate	$ 3,254	$ 3,424
Range and weighted average of appraisal adjustments	60.30%	67.20%
Range and weighted average of liquidation expenses	4.50%	4.90%
Impaired loans | Minimum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	3.80%	4.00%
Range and weighted average of liquidation expenses	3.00%	3.00%
Impaired loans | Maximum
Fair Value Inputs, Assets, Quantitative Information
Range and weighted average of appraisal adjustments	97.00%	97.00%
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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- 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=66048111&loc=d3e19207-110258

+ Details

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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

No definition available.

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