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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (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] |  |  |  |
Loan interest income | $ 132,540 | $ 124,726 | $ 381,996 | $ 368,999
Income before income taxes | 66,491 | 54,683 | 200,468 | 117,318
Income tax provision | (13,474) | (9,949) | (40,559) | (21,374)
Net Income | 53,017 | 44,734 | 159,909 | 95,944
Compensation and employee benefits | 54,679 | 55,133 | 159,865 | 156,018
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Debt Securities [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Gain (Loss) | 0 | 0 | 314 | 249
Income before income taxes | 606 | 0 | 1,370 | 249
Income tax provision | (141) | 0 | (319) | (58)
Net Income | 465 | 0 | 1,051 | 191
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of unrealized gains and losses related to available for sale securities transfer |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loan interest income | 606 | 0 | 1,056 | 0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Pension Plan Liability [Member] |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | (149) | (104) | (448) | (311)
Income tax provision | 35 | 24 | 104 | 72
Net Income | (114) | (80) | (344) | (239)
Compensation and employee benefits | (149) | (104) | (448) | (311)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized gains and losses from hedging instruments |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Income before income taxes | 2,631 | 2,673 | 7,809 | 5,803
Income tax provision | (612) | (621) | (1,815) | (1,349)
Net Income | 2,019 | 2,052 | 5,994 | 4,454
Loans | $ 2,631 | $ 2,673 | $ 7,809 | $ 5,803

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