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Other Comprehensive Income (Details 2) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net gain on securities transactions |  | $ 21,595 | $ 22,116 | $ 21,625 | $ 21,180 | $ 20,444 | $ 21,645 | $ 26,452 | $ 18,973 | $ 86,516 | $ 87,514 | $ 77,576
Tax expense (benefit) |  |  |  |  |  |  |  |  |  | (27,045) | (28,962) | $ (25,404)
Net retirement plan actuarial loss |  |  |  |  |  |  |  |  |  |  |  |
Total before tax | [1],[2] |  |  |  |  |  |  |  |  | (1,338) | (2,218) |
Net retirement plan prior service credit |  |  |  |  |  |  |  |  |  |  |  |
Total before tax |  |  |  |  |  |  |  |  |  | (76) | 359 |
Net retirement plan transition liability |  |  |  |  |  |  |  |  |  |  |  |
Total before tax | [1],[2] |  |  |  |  |  |  |  |  | 0 |  |
Employee Benefit Plans |  |  |  |  |  |  |  |  |  |  |  |
Total before tax | [1] |  |  |  |  |  |  |  |  | (1,414) | (1,859) |
Tax benefit | [1] |  |  |  |  |  |  |  |  | (565) | (744) |
Net of tax | [1] |  |  |  |  |  |  |  |  | (849) | (1,115) |
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |
Net gain on securities transactions | [1] |  |  |  |  |  |  |  |  | 926 | 1,108 |
Tax expense (benefit) | [1] |  |  |  |  |  |  |  |  | (370) | (443) |
Net of tax | [1] |  |  |  |  |  |  |  |  | $ 556 | $ 665 |
[1] | Amounts in parentheses indicate debits in income statement.
[2] | The accumulated other comprehensive income components are included in the computation of net periodic benefit cost (See Note 12 - “Employee Benefit Plans”).

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