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Derivative Financial Instruments - Interest Rate Swaps Not Designated as Hedges (Details) - Interest rate swap - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Financial Instruments |  |  |
Notional amount | $ 580,800 | $ 243,700 |
Variable rate, commercial loans that are supported by the interest rate swap contracts | 290,400 | 121,800 |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |
Derivative cash pledged | 18,100 | 1,000 |
Non-interest income |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |
Gross gains | 10,915 | 1,176 | $ 262
Non-interest expense |  |  |
Gross gains and losses on derivative assets and liabilities recorded in Consolidated Statements of Income |  |  |
Gross (losses) | (10,915) | (1,176) | $ (262)
Other assets |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other assets | 12,354 | 1,438 |
Other liabilities |  |  |
Fair values of derivative assets and liabilities recorded in consolidated balance sheets |  |  |
Fair value recorded in other liabilities | $ 12,354 | $ 1,438 |

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