Accumulated Other Comprehensive Loss (Components of AOCI) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (82,106)		$ (66,574)
Other comprehensive income (loss) before reclassifications	44,414		(22,836)
Amounts reclassified from accumulated other comprehensive loss	12,424	[1]	7,304	[1]
Net current period other comprehensive income (loss)	56,838		(15,532)		(30,045)
Ending balance	(25,268)		(82,106)		(66,574)
Unrealized Loss on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(6,292)	[2]	(6,483)	[2]
Other comprehensive income (loss) before reclassifications	(60)	[2]	(1,682)	[2]
Amounts reclassified from accumulated other comprehensive loss	1,918	[1],[2]	1,873	[1],[2]
Net current period other comprehensive income (loss)	1,858	[2]	191	[2]
Ending balance	(4,434)	[2]	(6,292)	[2]
Unrealized Gains on Investment Securities Available for Sale
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	20,517	[2]	16,115	[2]
Other comprehensive income (loss) before reclassifications	(30,608)	[2]	5,807	[2]
Amounts reclassified from accumulated other comprehensive loss	0	[1],[2]	(1,405)	[1],[2]
Net current period other comprehensive income (loss)	(30,608)	[2]	4,402	[2]
Ending balance	(10,091)	[2]	20,517	[2]
Defined Benefit Pension Items
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(96,331)	[2]	(76,206)	[2]
Other comprehensive income (loss) before reclassifications	75,082	[2]	(26,961)	[2]
Amounts reclassified from accumulated other comprehensive loss	10,506	[1],[2]	6,836	[1],[2]
Net current period other comprehensive income (loss)	85,588	[2]	(20,125)	[2]
Ending balance	$ (10,743)	[2]	$ (96,331)	[2]

[1] 1 Amounts in parentheses indicate debits to profit/loss.

[2] All amounts are net of tax. Amounts in parentheses indicate debits.