CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
OTHER COMPREHENSIVE INCOME (LOSS)
Change in unrealized holding gains on investment securities, deferred income tax expense	$ 2,689	$ 5,866
Reclassification adjustment for realized investment (gains) included in net income, income tax (expense)	(764)	(571)
Reclassification adjustment for amounts amortized into net periodic pension and postretirement benefit (income), deferred income tax (expense)	$ (190)	$ (242)