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Derivative Financial Instruments - Interest Rate Swaps Designated as Cash Flow Hedges (Details) - Cash Flow Hedging - Interest rate swap - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Sep. 17, 2020
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 50,000 |  | $ 50,000 |  | $ 70,000 |
Weighted average fixed pay rates | 1.79% |  | 1.79% |  | 1.80% |
Weighted average variable 3 month LIBOR receive rates | 0.12% |  | 0.12% |  | 0.22% |
Weighted average maturity in years |  |  | 2 years 11 months 15 days |  | 2 years 10 months 6 days |
Unrealized gains (losses), net of tax |  |  | $ (1,237) |  | $ (2,184) |
Interest expense on swap transactions | $ 300 | $ 300 | 900 | $ 500 |  |
Unrealized loss to be reclassified from OCI to interest expense during next twelve months |  |  | (200) |  |  |
Swap matured |  |  |  |  |  | $ 20,000
Other liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Fair value recorded in other liabilities | $ 1,700 |  | $ 1,700 |  | $ 3,100 |

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- Definition Interest income or expense incurred from sales or purchase of securities and other assets, which the entity does not own, to other parties. Trading liabilities includes the fair value of derivative contracts held for trading that are in loss positions. + References No definition available. + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994 + Details
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- Definition Average fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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