CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
OTHER COMPREHENSIVE INCOME (LOSS)
Unrealized holding gains (losses) on investment securities, deferred income tax expense (benefit)	$ (8,399)	$ 7,171	$ (5,710)	$ 13,037
Reclassification adjustment for realized investment (gains) included in net income, income tax (expense)	(1,860)	(1,107)	(2,624)	(1,678)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit (income), deferred income tax (expense)	$ (161)	$ (236)	$ (351)	$ (478)