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Derivative Financial Instruments - Forward Sales Commitments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Interest rate lock commitments | Other assets |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | $ 31,480 |  | $ 31,480 |  | $ 45,004
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 538 |  | 538 |  | 1,201
Interest rate lock commitments | Other liabilities |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 117 |  | 117 |  | 118
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other liabilities | 1 |  | 1 |  | 1
Forward sales commitments | Other assets |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 117 |  | 117 |  | 978
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 1 |  | 1 |  | 32
Forward sales commitments | Other liabilities |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 49,418 |  | 49,418 |  | 84,964
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other liabilities | 1,439 |  | 1,439 |  | 2,662
Interest rate lock commitments and forward sales commitments | Designated as hedging instrument |  |  |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Net gains (losses) | (901) | $ (2,469) | (2,114) | $ (7,232) |
Interest rate lock commitments and forward sales commitments | Other assets | Designated as hedging instrument |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 31,597 |  | 31,597 |  | 45,982
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 539 |  | 539 |  | 1,233
Interest rate lock commitments and forward sales commitments | Other liabilities | Designated as hedging instrument |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 49,535 |  | 49,535 |  | 85,082
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other liabilities | 1,440 |  | 1,440 |  | $ 2,663
Mortgage revenue | Interest rate lock commitments | Designated as hedging instrument |  |  |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Gross gains | 537 | 1,405 | 1,502 | 8,467 |
Mortgage revenue | Forward sales commitments | Designated as hedging instrument |  |  |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Gross (losses) | $ (1,438) | $ (3,874) | $ (3,616) | $ (15,699) |

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