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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 $ 53,071 $ 28,476 $ 40,067
Net change in unrealized losses on available-for-sale securities:      
Net change in unrealized losses on available-for-sale securities, net of tax of $1,558, $1,017, and $1,212, respectively (5,689) (1,888) (2,251)
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax [1] (2,160) 0 0
Net reclassification adjustment for gains included in net income, net of tax of $18, $1, and $158, respectively [2] 521 (556) (33)
Net change in unrealized losses on available-for-sale securities, net of tax (7,328) (2,444) (2,284)
Net change in unrealized losses on cash flow hedging derivatives:      
Net change in unrealized losses on cash flow hedging derivatives, net of tax of ($229), $134, and $343, respectively 837 (248) (637)
Net reclassification adjustment for effective portion of cash flow hedges included in interest expense, net of tax of ($709), ($593), and ($600), respectively [3] 652 1,035 1,317
Net change in unrealized losses on cash flow hedging derivatives, net of tax 1,489 787 680
Postretirement plans:      
Net actuarial gain (loss), net of tax of ($375), $723, and $127, respectively 1,368 (1,342) (235)
Reclassification of amortization of net unrecognized actuarial loss and of prior service cost included in net periodic cost, net of tax of ($83), ($84), and ($51), respectively [4] 463 170 152
Net gain (loss) on postretirement plans, net of tax 1,831 (1,172) (83)
Other comprehensive loss (4,008) (2,829) (1,687)
Comprehensive income $ 49,063 $ 25,647 $ 38,380
[1] (1)In the fourth quarter of 2018, the Company adopted ASU 2017-12, effective January 1, 2018, and transferred its qualifying held-to-maturity debt securities to available-for-sale securities. Refer to Note 1 for further details.
[2] (2) Reclassified into the consolidated statements of income within net gain on sale of securities.
[3] (3)Reclassified into the consolidated statements of income within interest on borrowings and subordinated debentures.
[4] (4) Reclassified into the consolidated statements of income within salaries and employee benefits and other expenses.