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Consolidation Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Net income $ 246,355 $ 271,623 $ 178,939
Unrealized holding gains (losses) arising during year 133,104 168,021 (97,284)
Unrealized losses on securities with credit loss recognized in earnings (6,459) 0 0
Amounts reclassified into net income: Held-to-maturity securities (19) (46) 87
Amounts reclassified into net income: Net realized losses on disposals and losses on intent-to-sell available-for-sale securities 4,247 530 31,316
Amounts reclassified into net income: Credit loss expense 3,984 0 0
Total unrealized gains (losses) on investment securities 134,857 168,505 (65,881)
Net actuarial gain (loss) 1,197 (10,898) (8,906)
Amounts reclassified into net income: Net actuarial loss 2,382 2,099 1,680
Total defined benefit pension and post-retirement plans 3,579 (8,799) (7,226)
Other comprehensive income (loss) 138,436 159,706 (73,107)
Comprehensive income $ 384,791 $ 431,329 $ 105,832