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Derivative Instruments and Hedge Activities - Summary of Derivative Financial Instruments and Classification on Consolidated Statements of Financial Condition (Details) - USD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives Fair Value [Line Items] |  |
Notional Amount | $ 341,358,000 | $ 548,969,000
Other Assets | 7,960,000 | 10,740,000
Other Liabilities | 8,519,000 | 4,243,000
Other Interest Rate Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 332,056,000 |
Other Assets | 7,960,000 |
Other Liabilities | 8,507,000 |
Derivatives Designated as Hedging Instruments | Interest Rate Swaps | Cash Flow Hedges |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 0 | 250,000,000
Other Assets |  | 6,699,000
Derivatives Not Designated As Hedging Instruments | Other Credit Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 9,302,000 | 4,424,000
Other Liabilities | 12,000 | 6,000
Derivatives Not Designated As Hedging Instruments | Other Interest Rate Derivatives |  |
Derivatives Fair Value [Line Items] |  |
Notional Amount | 332,056,000 | 294,545,000
Other Assets | 7,960,000 | 4,041,000
Other Liabilities | $ 8,507,000 | $ 4,237,000

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