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Derivative Instruments and Hedging Activities - Cash Flow Derivatives (Details) - Cash flow hedge - Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Cash Flow Hedging Derivatives |  |  |  |  |
Amount expected to be reclassified from AOCI into earnings |  |  | $ 8,600 |  |
Interest Rate Swap |  |  |  |  |
Cash Flow Hedging Derivatives |  |  |  |  |
Notional Amount | $ 183,000 |  | $ 183,000 |  | $ 163,000
Weighted Average Pay Rate | 2.00% |  | 2.00% |  | 1.90%
Weighted Average Receive Rate | 5.40% |  | 5.40% |  | 3.47%
Weighted average maturity |  |  | 4 years 3 months 18 days |  | 5 years 1 month 24 days
Net Unrealized Gain |  |  | $ 11,139 |  | $ 9,175
Interest Rate Cap |  |  |  |  |
Cash Flow Hedging Derivatives |  |  |  |  |
Notional Amount | $ 125,000 |  | $ 125,000 |  | $ 125,000
Weighted average maturity |  |  | 6 years 7 months 6 days |  | 7 years 4 months 6 days
Unamortized Premium Paid | $ 5,279 |  | $ 5,279 |  | $ 5,872
Weighted Average Strike Rate | 0.96% |  | 0.96% |  | 0.96%
Amortization of interest rate cap premiums | $ 198 | $ 204 | $ 593 | $ 574 |

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