Consolidated Statements of Comprehensive Income (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Consolidated Statements of Comprehensive Income
Net unrealized gains on securities arising during the period, taxes	$ 689	$ 1,917	$ 1,261	$ 4,258
Less: reclassification adjustment for net realized gains included in net income, taxes		146	53	148
Net unrealized holding losses arising during the period, taxes (benefits)		5		(4)
Less: reclassification adjustment to net income, tax benefits	37	37	112	78
Less: amortization of net loss, prior service gain and transition obligation included in net periodic benefit cost, tax benefits	2,443	1,405	7,321	3,513
Less: reclassification adjustment for impact of D&Os of the PUC included in regulatory assets, taxes	$ 2,129	$ 1,074	$ 6,386	$ 3,875