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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Statement of Comprehensive Income [Abstract] |  |  |
Net Income | $ 105,333 | $ 107,498 | $ 55,165
Other comprehensive income (loss), before tax expense (benefit): |  |  |
Unrealized holding gains on securities arising during the period | 20,625 | 2,783 | 7,023
Less: reclassification adjustment for gains on securities included in net income | (22) | (8,102) | (5,040)
Unrealized holding gains (losses) on derivatives arising during the period | 935 | 326 | (901)
Reclassification adjustment for losses on derivatives included in net income | 0 | 10 | 119
Unrealized (losses) gains for postretirement obligations: |  |  |
Net (loss) gain | (121) | 144 | 94
Total other comprehensive income (loss), before income tax expense (benefit) | 21,417 | (4,839) | 1,295
Income tax expense (benefit) related to items of other comprehensive income (loss) | 4,497 | (1,015) | 441
Comprehensive Income | $ 122,253 | $ 103,674 | $ 56,019

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