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Derivatives and hedging activities - Fair Values of Derivative Instruments on the Balance Sheet (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) security | Dec. 31, 2017 USD ($)
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 661 | $ 655
Liability Derivatives |  | 138 | 733
Interest Receivable |  | 7,115 | 6,936
Interest Payable |  | 1,195 | 497
Interest income |  |  |
Derivatives, Fair Value |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net |  | $ 13 |
Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Number of instruments held | security |  | 12 |
Derivatives designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | $ 553 |
Derivatives designated as hedging instruments | Interest Rate Floor |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 25,000 |
Derivatives designated as hedging instruments | Interest Rate Floor | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 553 |
Derivatives not designated as hedging instruments |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 108 | 655
Liability Derivatives |  | 138 | 733
Derivatives not designated as hedging instruments | Interest Rate Swaps |  |  |
Derivatives, Fair Value |  |  |
Notional amount |  | 62,071 |
Interest Receivable |  |  | 28
Interest Payable |  |  | 28
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Assets. |  |  |
Derivatives, Fair Value |  |  |
Asset Derivatives |  | 108 | 655
Derivatives not designated as hedging instruments | Interest Rate Swaps | Other Liabilities. |  |  |
Derivatives, Fair Value |  |  |
Liability Derivatives |  | $ 138 | $ 733
Forecast | Cash Flow Hedge | Interest Rate Floor | Interest income |  |  |
Derivatives, Fair Value |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net | $ 64 |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=109247956&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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