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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net Interest Income | $ 527,519 | $ 500,111 | $ 493,405
Income before income taxes | 256,509 | 192,392 | 241,611
Income Tax Expense (Benefit) | (53,689) | (38,148) | (47,160)
Net income | 202,820 | 154,244 | 194,451
Compensation and employee benefits | 224,034 | 209,722 | 212,867
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Debt Securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) | 315 | 285 | 2,132
Income before income taxes | 3,333 | 285 | 2,132
Income Tax Expense (Benefit) | (775) | (66) | (496)
Net income | 2,558 | 219 | 1,636
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Pension Plan Liability |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income before income taxes | (598) | (414) | (319)
Income Tax Expense (Benefit) | 139 | 96 | 74
Net income | (459) | (318) | (245)
Compensation and employee benefits | (598) | (414) | (319)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses from Hedging Instruments |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Income before income taxes | 10,441 | 8,418 | 595
Income Tax Expense (Benefit) | (2,427) | (1,957) | (138)
Net income | 8,014 | 6,461 | 457
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net | 10,441 | 8,418 | 595
Reclassification out of Accumulated Other Comprehensive Income | Amortization of unrealized gains and losses related to available for sale securities transfer |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net Interest Income | $ 3,018 | $ 0 | $ 0

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