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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - Interest rate swap - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income |  |  |  |  |
Net gains (losses) | $ 0 | $ 0 | $ 0 | $ 0 |
Cash pledged to secure obligations | 40,100 |  | 40,100 |  | $ 18,100
Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 791,100 |  | 791,100 |  | 580,800
Variable rate, commercial loans that are supported by the interest rate swap contracts | 395,500 |  | 395,500 |  | 290,400
Non-interest income |  |  |  |  |
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 | (549) | 4,695 | 25,790 | 15,205 |
Non-interest expense |  |  |  |  |
Gains and losses on these derivative assets and liabilities recorded in non-interest expense in the unaudited Consolidated Statements of Income |  |  |  |  |
Gain (loss) pay fixed receive floating | 549 | $ (4,695) | (25,790) | $ (15,205) |
Other assets |  |  |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 38,144 |  | 38,144 |  | 12,354
Other liabilities |  |  |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other liabilities | $ 38,144 |  | $ 38,144 |  | $ 12,354

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