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Derivative Instruments and Hedging Activities - Value of Derivative Assets and Derivative Liabilities (Details) - Not Designated as Hedging Instruments - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Other Assets |  |
Derivatives (included in Other Assets) |  |
Fair value | $ 40,415 | $ 78,319
Other Assets | Interest rate swap contracts—commercial loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 40,415 | 78,319
Notional amount | 983,243 | 983,638
Collateral posted | 0 | 0
Other Assets | Interest rate lock commitments—mortgage loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 1,509 | 2,900
Notional amount | 44,519 | 51,053
Other Assets | Forward sale contracts—mortgage loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 226 | 0
Notional amount | 36,835 | 0
Other Liabilities |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 40,818 | 79,033
Other Liabilities | Interest rate swap contracts—commercial loans |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 40,818 | 79,033
Notional amount | 983,243 | 983,638
Collateral posted | 43,340 | 77,930
Other Liabilities | Interest rate lock commitments—mortgage loans |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 0 | 0
Notional amount | 0 | 0
Other Liabilities | Forward sale contracts—mortgage loans |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 0 | 385
Notional amount | $ 0 | $ 47,062

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