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Short-term borrowings (Details 2) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	$ 289,565	$ 198,460
Repurchase agreement
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	74,215	78,110
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	4,811	6,555
Repurchase agreement | State and political subdivisions
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	20,696	12,304
Repurchase agreement | Mortgage-backed securities - residential
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	43,936	52,628
Repurchase agreement | Collateralized mortgage obligations
Assets Sold Under Agreements To Repurchase [Line Items]
Total borrowings	$ 4,772	$ 6,623

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+ References

No definition available.

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(1))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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