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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | [2] | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Investment securities gains (losses), net |  |  |  |  |  |  |  |  |  | $ (89) | $ (11) | $ 1,181
Income before income taxes | $ 55,482 | $ 57,821 | $ 51,748 | $ 46,785 | $ 40,851 | [1] | $ 59,107 | $ 38,252 | $ 39,773 | 211,836 | 177,983 | 149,781
Income Tax Expense (Benefit) | (10,734) | (11,406) | (9,999) | (6,815) | (25,123) | [1] | (18,338) | (11,120) | (10,574) | (38,954) | (65,155) | (44,915)
Net income | $ 44,748 | $ 46,415 | $ 41,749 | $ 39,970 | 15,728 | [1] | $ 40,769 | $ 27,132 | $ 29,199 | 172,882 | 112,828 | 104,866
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | 200,199 | 169,674 | 150,282
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 |  |  |  |  |  |  |  |  |  | 106 | (11) | 1,181
Income before income taxes |  |  |  |  |  |  |  |  |  | 106 | (11) | 1,181
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | (25) | 4 | (429)
Net income |  |  |  |  |  |  |  |  |  | 81 | (7) | 752
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) | (350) | (668)
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  | 74 | 127 | 243
Net income |  |  |  |  |  |  |  |  |  | (245) | (223) | (425)
Compensation and employee benefits |  |  |  |  |  |  |  |  |  | $ (319) | (350) | (668)
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) | $ (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) |  |  |  |  |  | (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) |  |  |  |  |  | $ (391) |
[1] | During the fourth quarter of 2017, Columbia acquired Pacific Continental and also recorded a charge through provision for income taxes related to the re-measurement of our deferred tax assets pursuant to the newly enacted Tax Cuts and Jobs Act. See Note 2, “Business Combinations,” for further information regarding this acquisition. See Note 23, “Income Tax,” for further information regarding the re-measurement of our deferred tax assets.
[2] | During the third quarter of 2017, Columbia sold its merchant card services portfolio.

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