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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 86,686 $ 69,456
Investment securities available for sale    
Net unrealized gains (losses) 30,490 (41,834)
Amortization of net unrealized gain (loss) on available for sale securities transferred to held to maturity securities 69 (297)
Reclassification adjustment for net losses (gains) realized in net income(a) [1] (1,680) 0
Reclassification from OCI due to change in accounting principle 0 (84)
Reclassification of certain tax effects from OCI 0 (8,419)
Income tax (expense) benefit (7,301) 10,635
Other comprehensive income (loss) on investment securities available for sale 21,578 (40,000)
Defined benefit pension and postretirement obligations    
Amortization of prior service cost (38) (38)
Amortization of actuarial loss (gain) 64 465
Reclassification of certain tax effects from OCI 0 (5,235)
Income tax (expense) benefit (7) (107)
Other comprehensive income (loss) on pension and postretirement obligations 20 (4,915)
Total other comprehensive income (loss) 21,597 (44,915)
Comprehensive income $ 108,283 $ 24,541
[1] Includes only available for sale securities.