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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | $ 28,300 |  | $ 28,300 |  | $ 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 | 408,500 |  | 408,500 |  | 395,000
Notional Amount, Derivative Asset | 408,477 |  | 408,477 |  | 394,954
Notional Amount, Derivative Liability | 408,477 |  | 408,477 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 23,354 |  | 23,354 |  | 32,685
Fair value recorded in other liabilities | 23,354 |  | 23,354 |  | 32,685
Interest rate swaps - pay floating, receive fixed | Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount, Derivative Asset | 326,513 |  | 326,513 |  | 394,954
Notional Amount, Derivative Liability | 81,964 |  | 81,964 |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 21,981 |  | 21,981 |  | 32,685
Fair value recorded in other liabilities | 1,373 |  | 1,373 |  |
Interest rate swaps - pay fixed, receive floating | Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional Amount, Derivative Asset | 81,964 |  | 81,964 |  |
Notional Amount, Derivative Liability | 326,513 |  | 326,513 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 1,373 |  | 1,373 |  |
Fair value recorded in other liabilities | 21,981 |  | 21,981 |  | $ 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 | 1,264 | $ 2,861 | (9,331) | $ 26,339 |
Gain (loss) pay fixed receive floating | $ (1,264) | $ (2,861) | $ 9,331 | $ (26,339) |

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