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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income per consolidated statements of income $ 39,813 $ 24,035 $ 76,643 $ 55,283
Net unrealized gains (losses) on available for sale securities and transferred securities:        
Net unrealized holding gains (losses) arising during the period (6,955) 2,832 (27,985) 4,243
Less: adjustment for net (gains) losses realized in net income 0 (1) 0 (1)
Change in net unrealized holding loss on securities transferred to held to maturity 728 734 1,452 1,495
Pension and other postretirement benefit plans:        
Net change in prior service costs 46 38 93 77
Recognized net loss due to lump sum settlement 30 0 61 0
Change in net actuarial loss 272 482 548 968
Recognized net loss due to defined benefit plan termination 0 10,492 0 10,492
Derivatives:        
Change in the accumulated gain (loss) on effective cash flow hedge derivatives 99 (129) 419 (94)
Less: adjustment for (gain) loss realized in net income (73) 48 (78) 109
Other comprehensive income (loss), net of tax (5,853) 14,496 (25,490) 17,289
Comprehensive income $ 33,960 $ 38,531 $ 51,153 $ 72,572