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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]        
Net income per consolidated statements of income $ 36,253 $ 34,579 $ 112,896 $ 89,862
Net unrealized gains (losses) on available for sale securities and transferred securities:        
Net unrealized holding gains (losses) arising during the period (7,246) (331) (35,231) 3,912
Less: adjustment for net (gains) losses realized in net income 0 (8) 0 (9)
Change in net unrealized holding loss on securities transferred to held to maturity 730 698 2,182 2,193
Pension and other postretirement benefit plans:        
Net change in prior service costs 47 39 140 116
Recognized net loss due to lump sum settlement 31 0 92 0
Change in net actuarial loss 271 219 819 1,187
Recognized net loss due to defined benefit plan termination 0 0 0 10,492
Derivatives:        
Change in the accumulated gain (loss) on effective cash flow hedge derivatives 39 33 458 (61)
Less: adjustment for (gain) loss realized in net income (79) 34 (157) 143
Other comprehensive income (loss), net of tax (6,207) 684 (31,697) 17,973
Comprehensive income $ 30,046 $ 35,263 $ 81,199 $ 107,835