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Derivative and Hedging Activities - Effect of Derivative Instruments on Consolidated Statements of Income and Comprehensive Income (Details) - Interest Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ (8,785) | $ (39,822) | $ (36,915) | $ (58,354)
Hedged Item - Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ 8,785 | $ 39,822 | $ 36,915 | $ 58,354

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