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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 $ 107,498 $ 55,165 $ 59,590
Other comprehensive (loss) income, before tax (benefit) expense:      
Unrealized holding gains (losses) on securities arising during the period 2,783 7,023 (6,304)
Less: reclassification adjustment for gains on securities included in net income (8,102) (5,040) (617)
Unrealized holding gains (losses) on derivatives arising during the period 326 (901) (479)
Reclassification adjustment for losses on derivatives included in net income 10 119 (70)
Unrealized gains for postretirement obligation:      
Net gain 144 94 331
Total other comprehensive (loss) income, before income tax (benefit) expense (4,839) 1,295 (7,139)
Income tax (benefit) expense related to items of other comprehensive (loss) income (1,015) 441 (2,498)
Comprehensive Income $ 103,674 $ 56,019 $ 54,949