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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 | Dec. 31, 2020 | Dec. 31, 2019
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Other Assets |  |
Derivatives (included in Other Assets) |  |
Fair value | $ 78,319 | $ 25,647
Other Assets | Interest Rate Swap Contracts—Commercial Loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 78,319 | 25,647
Notional amount | 983,638 | 740,762
Collateral posted | 0 | 0
Other Assets | Interest Rate Lock Commitments—Mortgage Loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 2,900 | 321
Notional amount | 51,053 | 9,829
Other Assets | Forward Sale Contracts—Mortgage Loans |  |
Derivatives (included in Other Assets) |  |
Fair value | 0 | 1
Notional amount | 0 | 12,750
Other Liabilities |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 79,033 | 25,615
Other Liabilities | Interest Rate Swap Contracts—Commercial Loans |  |
Derivatives (included in Other Liabilities) |  |
Fair value | 79,033 | 25,615
Notional amount | 983,638 | 740,762
Collateral posted | 77,930 | 26,127
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 | 385 | 0
Notional amount | $ 47,062 | $ 0

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