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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 22,730 $ 11,154 $ 43,403 $ 18,709
Unrealized gains (losses) on securities available for sale:        
Unrealized holding gains (losses) arising during the period, pretax (2,012) 1,989 (9,302) 3,102
Tax (expense) benefit 471 (737) 2,174 (1,144)
Reclassification to realized (gains) losses 235
Tax expense (benefit) (87)
Postretirement Plans:        
Amortization of unrecognized net actuarial (gain) loss 51 54 103 105
Tax expense (benefit) (12) (16) (24) (36)
Other comprehensive income (loss) (1,502) 1,290 (7,049) 2,175
Comprehensive income $ 21,228 $ 12,444 $ 36,354 $ 20,884