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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 264,670 | $ 176,100 | $ 159,366
Other comprehensive income (loss), before tax: |  |  |
Unrealized gains (losses) arising during the period | (2,231) | 3,111 | 2,599
Amount reclassified from accumulated other comprehensive loss | (64) | 60 | 180
Total minimum pension liability | (2,295) | 3,171 | 2,779
Other-than-temporary impairment loss on held-to-maturity securities: |  |  |
Non-credit loss on other-than-temporary impairment |  | (6,543) |
Amount reclassified from accumulated other comprehensive loss | 333 |  |
Total non-credit loss on other-than-temporary impairment | 333 | (6,543) |
Other comprehensive income (loss), before tax | (1,962) | (3,372) | 2,779
Income tax (provision) benefit related to items of comprehensive income (loss) | 630 | (1,052) |
Other comprehensive income (loss), net of tax | (1,332) | (4,424) | 2,779
Comprehensive income | $ 263,338 | $ 171,676 | $ 162,145

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