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Short-term borrowings (Details) - Repurchase agreement - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 86,795	$ 77,926
U.S. Treasury and U.S. government sponsored entities
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	5,738	5,051
State and political subdivisions
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	27,887	21,731
Mortgage-backed securities - residential
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	47,668	46,133
Collateralized mortgage obligations - residential
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 5,502	$ 5,011

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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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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

Reference 1: 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(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: 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(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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