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Other Comprehensive Income - Amounts reclassified from accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Realized gain on sale of investment securities $ 1,519 $ 115 $ 2,058 $ 1,650
Interest income derivative deposits (6,590) (10,995) (21,288) (44,055)
Income tax expense (14,847) (14,092) (46,108) (31,847)
Net Income 43,609 41,346 135,071 93,325
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 1,519 115 2,058 1,650
Interest income derivative deposits 0 (389) 517 (688)
Income tax expense (386) 71 (656) (244)
Net Income $ 1,133 $ (203) $ 1,919 $ 718