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Consolidation Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net income $ 403,837 $ 246,355 $ 271,623
Unrealized holding (losses) gains arising during year 119,598 133,104 168,021
Unrealized losses on securities with credit loss recognized in earnings (7,159) (6,459) 0
Amounts reclassified into net income: Held-to-maturity securities (9) (19) (46)
Amounts reclassified into net income: Net realized losses on disposals and losses on intent-to-sell available-for-sale securities (3,022) (4,247) (530)
Amounts reclassified into net income: Credit loss expense 5,418 (3,984) 0
Total unrealized (losses) gains on investment securities 124,370 134,857 168,505
Net actuarial gain (loss) (17,093) 1,197 10,898
Amounts reclassified into net income: Net actuarial loss 2,190 2,382 2,099
Total defined benefit pension and post-retirement plans 19,283 3,579 (8,799)
Other comprehensive (loss) income (105,087) 138,436 159,706
Comprehensive income $ 298,750 $ 384,791 $ 431,329