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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Consolidated Statements of Comprehensive Income [Abstract]        
Net income $ 4,678 $ 7,005 $ 19,154 $ 20,237
Unrealized gains (losses) on securities available for sale:        
Unrealized holding gains (losses) arising during the period, pretax 241 589 3,131 (154)
Tax (expense) benefit (94) (231) (1,223) 60
Reclassification to realized (gains) losses 1 (3) 1
Tax expense 1
Postretirement Plans:        
Amortization of unrecognized net actuarial (gain) loss 50 (16) 152 (63)
Tax expense (benefit) (20) 6 (59) 24
Other comprehensive income (loss) 177 349 1,999 (132)
Comprehensive income $ 4,855 $ 7,354 $ 21,153 $ 20,105