Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income (loss)	$ 18,028	$ 61,812	$ 116,052	$ 11,917
Unrealized gains (losses) on investments available-for-sale:
Unrealized holding gains arising during the period	36,554	16,219	64,126	44,604
Less: Reclassification adjustments for gains included in earnings	(4,272)	(5,369)	(29,661)	(32,320)
Unrealized gains on investments available-for-sale, net	32,282	10,850	34,465	12,284
Defined benefit pension plans:
Prior service cost arising during the period	0	0	0	0
Net loss arising during the period	0	0	0	0
Less: Amortization of prior service cost and net loss inluded in net periodic pension cost	1,038	157	3,114	471
Defined benefit pension plans, net	1,038	157	3,114	471
Other comprehensive income, before tax	33,320	11,007	37,579	12,755
Income tax expense (benefit) related to components of other comprehensive income	13,065	4,286	26,280	5,141
Other comprehensive (loss) income, net of tax	20,255	6,721	11,299	7,614
Comprehensive income (loss)	$ 38,283	$ 68,533	$ 127,351	$ 19,531