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Accumulated Other Comprehensive Income (Reclassification out of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Investment securities gains, net |  |  | $ 0 | $ 1,174
Compensation and employee benefits | $ 39,983 | $ 38,476 | 119,201 | 112,086
Total before tax | 59,107 | 39,608 | 137,132 | 106,746
Income tax provision | (18,338) | (12,124) | (40,032) | (32,598)
Net income | 40,769 | 27,484 | 97,100 | 74,148
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 | 0 | 572 | 0 | 1,174
Total before tax | 0 | 572 | 0 | 1,174
Income tax provision | 0 | (208) | 0 | (426)
Net income | 0 | 364 | 0 | 748
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 | (72) | (167) | (279) | (501)
Total before tax | (72) | (167) | (279) | (501)
Income tax provision | 26 | 60 | 101 | 182
Net income | $ (46) | $ (107) | $ (178) | $ (319)

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