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Derivative Instruments (Details) - Not designated as hedging - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative Instruments |  |
Fair Value, Derivative Assets | $ 14,678 | $ 1,621
Fair Value, Derivative Liabilities | 1,960 | 109
Notional Amount, Derivative Assets | 455,623 | 58,499
Notional Amount, Derivative Liabilities | 380,063 | 68,500
Interest rate lock commitments | Accrued interest and other assets |  |
Derivative Instruments |  |
Fair Value, Derivative Assets | 13,133 | 1,228
Notional Amount, Derivative Assets | 401,313 | 45,715
Forward loan sales commitments | Accrued interest and other assets |  |
Derivative Instruments |  |
Fair Value, Derivative Assets | 1,545 | 393
Notional Amount, Derivative Assets | 54,310 | 12,784
TBA mortgage backed securities | Accrued expenses and other liabilities |  |
Derivative Instruments |  |
Fair Value, Derivative Liabilities | 1,960 | 109
Notional Amount, Derivative Liabilities | $ 380,063 | $ 68,500

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