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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]                      
Investment securities gains (losses), net                 $ 16,710 $ 2,132 $ (89)
Income before income taxes $ 75,074 $ 54,683 $ 44,777 $ 17,858 $ 58,032 $ 63,105 $ 63,818 $ 56,656 192,392 241,611 211,836
Income Tax Expense (Benefit) (16,774) (9,949) (8,195) (3,230) (11,903) (12,378) (12,094) (10,785) (38,148) (47,160) (38,954)
Net income $ 58,300 $ 44,734 $ 36,582 $ 14,628 $ 46,129 $ 50,727 $ 51,724 $ 45,871 154,244 194,451 172,882
Compensation and employee benefits                 209,722 212,867 200,199
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]                      
Investment securities gains (losses), net                 285 2,132 106
Income before income taxes                 285 2,132 106
Income Tax Expense (Benefit)                 (66) (496) (25)
Net income                 219 1,636 81
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                 (414) (319) (319)
Income Tax Expense (Benefit)                 96 74 74
Net income                 (318) (245) (245)
Compensation and employee benefits                 (414) (319) (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                 8,418 595 0
Income Tax Expense (Benefit)                 (1,957) (138) 0
Net income                 6,461 457 0
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net                 $ 8,418 $ 595 $ 0