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Short-term borrowings (Details) - Repurchase agreement - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 9,144 | $ 77,926
U.S. Treasury and U.S. government sponsored entities |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 574 | 5,051
State and political subdivisions |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 2,934 | 21,731
Mortgage-backed securities - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | 5,102 | 46,133
Collateralized mortgage obligations - residential |  |
Assets Sold Under Agreements To Repurchase [Line Items] |  |
Total repurchase agreements | $ 534 | $ 5,011

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- Definition 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://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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