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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Net income | $ 81,477 | $ 92,046 | $ 89,289
Unrealized gains (losses) on securities available for sale: |  |  |
Unrealized holding gains (losses) arising during the period, pretax | 18,729 | 22,230 | (10,179)
Tax (expense) benefit | (4,304) | (5,157) | 2,379
Reclassification to realized (gains) losses | (8,024) | (97) | 0
Tax expense (benefit) | 1,844 | 22 | 0
Postretirement plans: |  |  |
Net gain (loss) arising during period | 589 | (686) | (41)
Tax (expense) benefit | (135) | 158 | 10
Amortization of unrecognized net actuarial loss | 686 | 814 | 21
Tax benefit | (158) | (200) | (5)
Other comprehensive income (loss) | 9,227 | 17,084 | (7,815)
Comprehensive income | $ 90,704 | $ 109,130 | $ 81,474

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