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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Net Income $ 55,165 $ 59,590 $ 50,143
Other comprehensive income (loss), before tax expense (benefit):      
Unrealized holding gains (losses) on securities arising during the period 7,023 (6,304) 2,798
Less: reclassification adjustment for (gains) losses on securities included in net income (5,040) (617) 153
Unrealized holding (losses) gains on derivatives arising during the period (901) (479) 450
Reclassification adjustment for losses on derivatives included in net income 119 (70) (49)
Unrealized gains (losses) for postretirement obligation:      
Net gain (loss) 94 331 (102)
Total other comprehensive income (loss), before income tax expense (benefit) 1,295 (7,139) 3,250
Income tax expense (benefit) related to items of other comprehensive income (loss) 441 (2,498) 1,137
Comprehensive Income $ 56,019 $ 54,949 $ 52,256