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Derivatives (Terminated Derivatives) (Details) - Forward Swap $ in Thousands | Sep. 30, 2021 USD ($) Instrument | Mar. 31, 2020 USD ($) Instrument | Sep. 30, 2018 USD ($) Instrument | Sep. 30, 2017 USD ($) Instrument | Dec. 31, 2016 USD ($) Instrument | Oct. 31, 2015 USD ($) Instrument | May 30, 2014 USD ($) Instrument
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Derivative [Line Items] |  |  |  |  |  |  |
Number Of Interest Rate Derivatives Terminated | Instrument | 2 | 3 | 2 | 2 | 2 | 4 | 3
Aggregate Notional Amount | $ 120,000 | $ 200,000 | $ 250,000 | $ 250,000 | $ 180,000 | $ 300,000 | $ 225,000
Liability Fair Value When Terminated | 1,584 | 13,141 |  | 7,690 |  | 13,369 | 6,312
Asset Fair Value When Terminated |  |  | (4,080) |  | (13,352) |  |
Fair Value Deferred In Other Comprehensive Income | $ 1,584 | $ 13,141 | $ (4,080) | $ 7,688 | $ (13,345) | $ 13,369 | $ 6,312

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