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Other Comprehensive Income - Amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gain on sale of investment securities $ 221 $ 822
Interest income derivative deposits (7,899) (20,546)
Income tax expense (14,574) (8,322)
Net Income 43,469 23,123
Reclassification out of Accumulated Other Comprehensive Income (Loss)    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Realized gain on sale of investment securities 221 822
Interest income derivative deposits 384 94
Income tax expense (151) (243)
Net Income $ 454 $ 673