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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Statement of Comprehensive Income [Abstract] |  |  |  |
Net income | $ 16,352 | $ 23,859 | $ 34,532 | $ 46,144
Unrealized gains (losses) on securities available for sale: |  |  |  |
Unrealized holding gains (losses) arising during the period, pretax | 2,772 | 11,701 | 23,537 | 17,604
Tax (expense) benefit | (637) | (2,714) | (5,409) | (4,094)
Reclassification to realized (gains) losses | (8,024) | 0 | (8,024) | 0
Tax expense (benefit) | 1,844 | 0 | 1,844 | 0
Postretirement Plans: |  |  |  |
Amortization of unrecognized net actuarial loss | 180 | 228 | 358 | 456
Tax benefit | (42) | (63) | (83) | (117)
Other comprehensive income (loss) | (3,907) | 9,152 | 12,223 | 13,849
Comprehensive income | $ 12,445 | $ 33,011 | $ 46,755 | $ 59,993

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