Accumulated Other Comprehensive Income (Loss) (Tables)

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Income (Loss) Net Of Tax [Abstract]

Summary of activity in accumulated other comprehensive income (loss)

			Investments	Defined Benefit					Accumulated
			Securities		Pension and		Cash Flow		Other
			Available	Post Retirement			Hedging		Comprehensive
			For Sale		Obligations		Relationships		Income (Loss)
Balance December 31, 2011		$	99,761	$	(33,173)	$	(986)	$	65,602
Other comprehensive income (loss) before
	reclassifications		(19,042)		(10,014)		6		(29,050)
Amounts reclassified from accumulated other
	comprehensive income (loss)		(4,261)		3,315		1,954		1,008
Income tax (expense) benefit			9,651		2,366		(974)		11,043
Net other comprehensive income (loss) during period			(13,652)		(4,333)		986		(16,999)
Balance December 31, 2012		$	86,109	$	(37,506)	$	0	$	48,603
Other comprehensive income (loss) before
	reclassifications		(158,207)		35,804		0		(122,403)
Amounts reclassified from accumulated other
	comprehensive income (loss)		(564)		4,416		0		3,852
Income tax (expense) benefit			61,266		(15,562)		0		45,704
Net other comprehensive income (loss) during period			(97,505)		24,658		0		(72,847)
Balance December 31, 2013		$	(11,396)	$	(12,848)	$	0	$	(24,244)
Other comprehensive income (loss) before
	reclassifications		49,038		(18,428)		-		30,610
Amounts reclassified from accumulated other
	comprehensive income (loss)		(494)		1,407		-		913
Income tax (expense) benefit			(18,636)		6,507		-		(12,129)
Net other comprehensive income (loss) during period			29,908		(10,514)		-		19,394
Balance December 31, 2014		$	18,512	$	(23,362)	$	0	$	(4,850)