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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (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 swap |  |  |  |  |
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income |  |  |  |  |
Cash pledged to secure obligations | $ 26,300 |  | $ 26,300 |  | $ 36,000
Interest rate swap | Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Variable rate, commercial loans that are supported by the interest rate swap contracts | 424,600 |  | 424,600 |  | 395,000
Notional Amount, Derivative Asset | 424,567 |  | 424,567 |  | 394,954
Notional Amount, Derivative Liability | 424,567 |  | 424,567 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 21,330 |  | 21,330 |  | 32,685
Fair value recorded in other liabilities | 21,330 |  | 21,330 |  | 32,685
Interest rate swaps - pay floating, receive fixed | Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount, Derivative Asset | 332,856 |  | 332,856 |  | 394,954
Notional Amount, Derivative Liability | 91,711 |  | 91,711 |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 19,420 |  | 19,420 |  | 32,685
Fair value recorded in other liabilities | 1,910 |  | 1,910 |  |
Interest rate swaps - pay fixed, receive floating | Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount, Derivative Asset | 91,711 |  | 91,711 |  |
Notional Amount, Derivative Liability | 332,856 |  | 332,856 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 1,910 |  | 1,910 |  |
Fair value recorded in other liabilities | 19,420 |  | 19,420 |  | $ 32,685
Non-interest expense | Interest rate swap |  |  |  |  |
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income |  |  |  |  |
Gain (loss) pay, floating receive fixed | (2,024) | $ (549) | (11,355) | $ 25,790 |
Gain (loss) pay fixed receive floating | $ 2,024 | $ 549 | $ 11,355 | $ (25,790) |

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