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Accumulated Other Comprehensive Income Amounts reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment securities gains (losses), net |  |  |  |  |  |  |  |  | $ 2,132 | $ (89) | $ (11) |
Income before income taxes | $ 58,032 | $ 63,105 | $ 63,818 | $ 56,656 | $ 55,482 | $ 57,821 | $ 51,748 | $ 46,785 | 241,611 | 211,836 | 177,983 |
Income Tax Expense (Benefit) | (11,903) | (12,378) | (12,094) | (10,785) | (10,734) | (11,406) | (9,999) | (6,815) | (47,160) | (38,954) | (65,155) |
Net income | $ 46,129 | $ 50,727 | $ 51,724 | $ 45,871 | $ 44,748 | $ 46,415 | $ 41,749 | $ 39,970 | 194,451 | 172,882 | 112,828 |
Compensation and employee benefits |  |  |  |  |  |  |  |  | 212,867 | 200,199 | 169,674 |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment securities gains (losses), net |  |  |  |  |  |  |  |  | 2,132 | 106 | (11) |
Income before income taxes |  |  |  |  |  |  |  |  | 2,132 | 106 | (11) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (496) | (25) | 4 |
Net income |  |  |  |  |  |  |  |  | 1,636 | 81 | (7) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (319) | (319) | (350) |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 74 | 74 | 127 |
Net income |  |  |  |  |  |  |  |  | (245) | (245) | (223) |
Compensation and employee benefits |  |  |  |  |  |  |  |  | (319) | (319) | (350) |
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 595 | 0 | 0 |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | (138) | 0 | 0 |
Net income |  |  |  |  |  |  |  |  | 457 | 0 | 0 |
Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net |  |  |  |  |  |  |  |  | $ 595 | $ 0 | 0 |
Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  |  | $ 0
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  | (4,082) | $ (4,082)
Accounting Standards Update 2018-02 [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  | (3,691) |
Accounting Standards Update 2018-02 [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption |  |  |  |  |  |  |  |  |  |  | $ (391) |

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