CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on investment securities, deferred income tax expense (benefit)	$ (2,014)	$ 4,455	$ (7,056)	$ 9,681
Reclassification adjustment for net realized investment (gains) losses included in net income (loss), income tax (expense) benefit	1,153	(1,646)	1,204	(2,227)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit cost (income), deferred income tax (expense) benefit	$ (143)	$ (146)	$ (287)	$ (293)