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Derivative Instruments and Hedge Activities - Summary of Company's Interest Rate Derivative and Offsetting Positions (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Derivative assets fair value | $ 5,981 | $ 4,317
Net amount presented in the Consolidated Statements of Financial Condition | 5,981 |
Gross amounts not offset in the Consolidated Statements of Financial Condition |  |
Offsetting derivative positions | (232) |
Collateral posted | (5,371) |
Net credit exposure | 378 |
Derivative liabilities fair value | 994 | $ 559
Net amount presented in the Consolidated Statements of Financial Condition | 994 |
Gross amounts not offset in the Consolidated Statements of Financial Condition |  |
Offsetting derivative positions | (232) |
Collateral posted | (745) |
Net credit exposure | $ 17 |

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