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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Investment securities gains, net | $ 22 | $ 0
Compensation and employee benefits | 50,570 | 40,825
Total before tax | 46,785 | 39,773
Income tax provision | (6,815) | (10,574)
Net income | 39,970 | 29,199
Reclassification out of Accumulated Other Comprehensive Income [Member] | Unrealized Gains and Losses on Available-for-Sale Securities [Member] |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Investment securities gains, net | 102 | 0
Total before tax | 102 | 0
Income tax provision | (24) | 0
Net income | 78 | 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] |  |
Compensation and employee benefits | (80) | (136)
Total before tax | (80) | (136)
Income tax provision | 19 | 49
Net income | $ (61) | $ (87)

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