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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - Interest rate swap - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Net gains (losses) | $ 0 | $ 0 | $ 0 | $ 0 |
Derivative cash pledged | 38,800 |  | 38,800 |  | $ 18,100
Not designated as hedging |  |  |  |  |
Derivative Financial Instruments |  |  |  |  |
Notional amount | 685,200 |  | 685,200 |  | 580,800
Variable rate, commercial loans that are supported by the interest rate swap contracts | 342,600 |  | 342,600 |  | 290,400
Non-interest income |  |  |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Gross gains | 2,861 | 73 | 26,339 | 164 |
Non-interest expense |  |  |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |  |  |
Gross (losses) | (2,861) | $ (73) | (26,339) | $ (164) |
Other assets |  |  |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other assets | 38,693 |  | 38,693 |  | 12,354
Other liabilities |  |  |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |  |  |
Fair value recorded in other liabilities | $ 38,693 |  | $ 38,693 |  | $ 12,354

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