Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net unrealized gains (losses) arising during the period, tax expense (benefit)	$ 26	$ 657	$ (1,742)	$ 1,416
Reclassification adjustment for net gains on sales realized in net income, tax expense	0	146	1	396
Unrealized investment gains (losses), tax expense (benefit)	26	166	(1,743)	1,020
Change in fair value of hedging instruments, tax expense	0	0	324	0
Change in unfunded pension liability related to unrealized loss, prior service cost and transition obligation, tax expense	133	146	399	438
Change in unfunded pension liability related to curtailment, tax expense	0	0	627	0
Total Change in unfunded pension liability, tax expense	$ 133	$ 146	$ 1,026	$ 438