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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 11,154 $ 7,639 $ 18,709 $ 14,476
Unrealized gains (losses) on securities available for sale:        
Unrealized holding gains (losses) arising during the period, pretax 1,989 2,071 3,102 2,888
Tax (expense) benefit (737) (807) (1,144) (1,126)
Reclassification to realized (gains) losses 235 (3)
Tax expense (benefit) (87) 1
Postretirement Plans:        
Amortization of unrecognized net actuarial (gain) loss 54 51 105 102
Tax expense (benefit) (16) (20) (36) (40)
Other comprehensive income (loss) 1,290 1,295 2,175 1,822
Comprehensive income $ 12,444 $ 8,934 $ 20,884 $ 16,298