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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net income |  | $ 80,411 | $ 57,330 | $ 52,084
Change in securities available for sale: |  |  |  |
Unrealized holding gain (loss) on securities available for sale arising during the period |  | (7,339) | 2,245 | (7,238)
Reclassification adjustment for (gains)/losses included in net income |  | 50 | (32) | (66)
Net securities gain (loss) activity during the period |  | (7,289) | 2,213 | (7,304)
Tax effect |  | 1,637 | (707) | 2,746
Net of tax amount |  | (5,652) | 1,506 | (4,558)
Defined benefit pension plans: |  |  |  |
Net gain(loss) on defined benefit pension plans |  | 269 | 97 | (151)
Amortization of net actuarial loss | [1] | 266 | 265 | 215
Net gain on activity during the period |  | 535 | 362 | 64
Tax effect |  | (163) | (151) | (35)
Net of tax amount |  | 372 | 211 | 29
Total other comprehensive income (loss), net of tax |  | (5,280) | 1,717 | (4,529)
Comprehensive income |  | $ 75,131 | $ 59,047 | $ 47,555
[1] | Included in the computation of net pension plan expense as more fully discussed in Note 11.

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