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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 | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Interest Rate Swap |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ 25,215 | $ (28,130) | $ (19,731) | $ (53,483)
Hedged Item - Loans |  |  |  |
Derivative [Line Items] |  |  |  |
Interest income | $ (25,215) | $ 28,130 | $ 19,731 | $ 53,483

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