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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net Income $ 74,138 $ 54,312 $ 49,349
Securities available for sale and transferred securities:      
Change in unrealized (loss) gain on available for sale securities during the period (34,238) 15,217 (23,459)
Unrealized net gain on securities transferred from held to maturity to available for sale under the transition guidance enumerated in ASU 2017-12 11,881 0 0
Change in net unrealized loss on securities transferred from held to maturity to available for sale 401 0 0
Change in net unrealized loss on securities transferred to held to maturity 0 0 (10,240)
Reclassification adjustment for net loss on equity investments, reclassified to retained earnings with adoption of ASU 2016-01 107 0 0
Reclassification adjustment for amortization related to available for sale and to held to maturity debt securities 1,244 1,255 429
Reclassification adjustment for net loss (gain) on sale of available for sale securities, included in net income 1,839 (625) (2,836)
Derivatives:      
Change in unrealized gain on effective cash flow hedge interest rate swap derivatives 2,351 3 5,255
Change in net unrealized gains on interest rate swap derivatives terminated during the period 0 273 0
Reclassification adjustment from other comprehensive income (loss) related to derivatives designated as cash flow hedge (1,406) 754 1,815
Pension plans:      
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost 2,182 1,605 1,820
Effect of settlement recognition 0 8 (8)
Prior service cost adjustment due to plan amendments 0 0 (121)
Change in net actuarial loss (1,994) (5,218) (3,132)
Other comprehensive (loss) income, before tax (17,633) 13,272 (30,477)
Income tax benefit (expense) related to items of other comprehensive income (loss) 3,703 (5,374) 10,667
Other comprehensive (loss) income, net of tax (13,930) 7,898 (19,810)
Comprehensive income $ 60,208 $ 62,210 $ 29,539