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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Consolidated Statements of Comprehensive Income [Abstract]    
Net income $ 6,837 $ 6,988
Unrealized gains (losses) on securities available for sale:    
Unrealized holding gains (losses) arising during the period, pretax 817 247
Tax (expense) benefit (319) $ (95)
Reclassification to realized (gains) losses (3)
Tax expense (benefit) 1
Postretirement Plans:    
Amortization of unrecognized net actuarial (gain) loss 51 $ (31)
Tax expense (benefit) (20) 12
Other comprehensive income (loss) 527 133
Comprehensive income $ 7,364 $ 7,121