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Short-term borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 12,876	$ 20,054
Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	2.69%	2.04%
Pledged
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 120,000	$ 150,000
Pledged | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	0.63%	0.39%
Pledged | Repurchase advance
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 100,000	$ 100,000
Pledged | Repurchase advance | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	0.63%	0.39%
Pledged | Cash management advance
Assets Sold Under Agreements To Repurchase [Line Items]
Amount of Advances	$ 20,000	$ 50,000
Pledged | Cash management advance | Weighted Average
Assets Sold Under Agreements To Repurchase [Line Items]
Weighted Average Interest Rate	0.59%	0.39%

X

- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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+ References

No definition available.

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- Definition

States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822

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