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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 6,244 $ 6,646 $ 13,232 $ 12,322
Unrealized gains (losses) on securities available for sale:        
Unrealized holding gains (losses) arising during the period, pretax (990) 749 (743) 1,052
Tax (expense) benefit $ 386 (292) $ 291 (410)
Reclassification to realized gains   (786)   (786)
Tax expense   306   306
Postretirement Plans:        
Amortization of unrecognized net actuarial (gain) loss $ (16) (56) $ (47) (110)
Tax expense (benefit) 6 33 18 66
Other comprehensive income (loss) (614) (46) (481) 118
Comprehensive income $ 5,630 $ 6,600 $ 12,751 $ 12,440