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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 13,086 $ 4,678 $ 31,795 $ 19,154
Unrealized gains (losses) on securities available for sale:        
Unrealized holding gains (losses) arising during the period, pretax 186 241 3,288 3,131
Tax (expense) benefit (69) (94) (1,213) (1,223)
Reclassification to realized (gains) losses 235 (3)
Tax expense (benefit) (87) 1
Postretirement Plans:        
Amortization of unrecognized net actuarial (gain) loss 53 50 158 152
Tax expense (benefit) (20) (20) (56) (59)
Other comprehensive income (loss) 150 177 2,325 1,999
Comprehensive income $ 13,236 $ 4,855 $ 34,120 $ 21,153