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Derivative Instruments and Hedge Activities - Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition (Details) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Notional Amount | $ 866,486,000 | $ 391,847,000
Other Assets | 13,463,000 | 17,149,000
Other Liabilities | (12,348,000) | (18,133,000)
Cash Flow Hedging |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 400,000,000 |
Other Assets | 1,799,000 |
Other Liabilities | (192,000) |
Other Interest Rate Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 458,698,000 |
Other Assets | 11,664,000 |
Other Liabilities | (12,148,000) |
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedging |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 400,000,000 | 0
Other Assets | 1,799,000 | 0
Other Liabilities | 192,000 | 0
Derivatives Not Designated As Hedging Instruments | Other Credit Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 7,788,000 | 8,437,000
Other Assets | 0 | 0
Other Liabilities | 8,000 | 17,000
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 458,698,000 | 383,410,000
Other Assets | 11,664,000 | 17,149,000
Other Liabilities | $ 12,148,000 | $ 18,116,000

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