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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loan interest income | $ 147,451 | $ 125,462 | $ 293,651 | $ 249,456
Income before income taxes | 74,978 | 69,576 | 148,105 | 133,977
Income tax provision | (16,170) | (14,537) | (31,775) | (27,085)
Net Income | 58,808 | 55,039 | 116,330 | 106,892
Compensation and employee benefits | 57,386 | 53,450 | 120,465 | 105,186
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, Realized Gain | 0 | 314 | 0 | 314
Income before income taxes | 2,710 | 764 | 4,112 | 764
Income tax provision | (630) | (178) | (956) | (178)
Net Income | 2,080 | 586 | 3,156 | 586
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 | 2,710 | 450 | 4,112 | 450
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 | (131) | (149) | (262) | (299)
Income tax provision | 31 | 34 | 61 | 69
Net Income | (100) | (115) | (201) | (230)
Compensation and employee benefits | (131) | (149) | (262) | (299)
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 | 2,603 | 2,602 | 5,178 | 5,178
Income tax provision | (605) | (604) | (1,204) | (1,203)
Net Income | 1,998 | 1,998 | 3,974 | 3,975
Loans | $ 2,603 | $ 2,602 | $ 5,178 | $ 5,178

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