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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 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 | $ 25,600 |  | $ 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 | 401,200 |  | 395,000
Notional Amount, Derivative Asset | 401,247 |  | 394,954
Notional Amount, Derivative Liability | 401,247 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 22,090 |  | 32,685
Fair value recorded in other liabilities | 22,090 |  | 32,685
Interest rate swaps - pay floating, receive fixed | Not designated as hedging |  |  |
Derivative Financial Instruments |  |  |
Notional Amount, Derivative Asset | 308,178 |  | 394,954
Notional Amount, Derivative Liability | 93,069 |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 18,881 |  | 32,685
Fair value recorded in other liabilities | 3,209 |  |
Interest rate swaps - pay fixed, receive floating | Not designated as hedging |  |  |
Derivative Financial Instruments |  |  |
Notional Amount, Derivative Asset | 93,069 |  |
Notional Amount, Derivative Liability | 308,178 |  | 394,954
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 3,209 |  |
Fair value recorded in other liabilities | 18,881 |  | $ 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 | (10,595) | $ 23,478 |
Gain (loss) pay fixed receive floating | $ 10,595 | $ (23,478) |

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