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Short-term borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 31,001	$ 244,759
Repurchase agreement
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	4,899	4,409
Repurchase agreement | U.S. Treasury and U.S. government sponsored entities
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	220	332
Repurchase agreement | State and political subdivisions
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	1,758	664
Repurchase agreement | Mortgage-backed securities - residential
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	2,577	3,094
Repurchase agreement | Collateralized mortgage obligations
Assets Sold Under Agreements To Repurchase [Line Items]
Total repurchase agreements	$ 344	$ 319

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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.

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Reference 1: 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(19)(a))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: 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)(a)(1))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 3: 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(13))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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