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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Comprehensive Income [Abstract]      
Net Income $ 50,143 $ 44,453 $ 41,482
Other comprehensive income (loss), before tax expense (benefit):      
Unrealized holding gains (losses) on securities arising during the period 2,798 25,153 (34,975)
Less: reclassification adjustment for losses (gains) on securities included in net income 153 (550) 1,158
Unrealized holding gains on derivatives arising during the period 450 472 0
Reclassification adjustment for gains on derivatives included in net income (49) (10) 0
Unrealized (losses) gains for postretirement obligations:      
Transition obligation 0 0 0
Net (loss) gain (102) (313) 219
Total other comprehensive income (loss), before tax expense (benefit) 3,250 24,752 (33,598)
Income tax expense (benefit) related to items of other comprehensive income (loss) 1,137 8,663 (11,751)
Comprehensive Income $ 52,256 $ 60,542 $ 19,635