Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income	$ 39,834	$ 40,533	$ 135,437	$ 110,594
Other comprehensive income:
Net unrealized appreciation (depreciation) of investment securities during the period, net of income taxes of $(3,768), $1,917, $(3,297) and $997, respectively	(6,458)	3,286	(5,657)	1,709
Valuation allowance on investment securities' deferred tax asset during the period	(3,873)	1,128	(4,129)	590
Pension and postretirement benefits, net of income taxes of $212, $206, $644 and $617, respectively	393	350	1,171	1,050
Reclassification adjustment for amounts included in net income, net of income taxes of $(100), $(143), $(830) and $(464), respectively	(172)	(247)	(1,428)	(799)
Comprehensive income	$ 29,724	$ 45,050	$ 125,394	$ 113,144