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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 176,100 | $ 159,366 | $ 111,511
Other comprehensive income (loss), before tax: |  |  |
Unrealized gains arising during the period | 3,111 | 2,599 | 1,920
Amount reclassified from accumulated other comprehensive loss | 60 | 180 | 88
Total Minimum pension liability | 3,171 | 2,779 | 2,008
Other-than-temporary impairment loss on held-to-maturity securities: |  |  |
Non-credit loss on other-than-temporary impairment | (6,543) |  |
Total Non-credit loss on other-than-temporary impairment | (6,543) |  |
Other comprehensive income (loss), before tax | (3,372) | 2,779 | 2,008
Income tax expense related to items of comprehensive income (loss) | (1,052) |  | (724)
Other comprehensive income (loss), net of tax | (4,424) | 2,779 | 1,284
Comprehensive income | $ 171,676 | $ 162,145 | $ 112,795

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