Other Comprehensive Income (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of securities available for sale, before tax	$ (1,489)		$ (202)		$ 2,312		$ (7,771)
Changes in fair value of securities available for sale, tax	(536)		(73)		836		(2,768)
Changes in fair value in securities available for sale	(953)		(129)		1,476		(5,003)
Net losses (gains) on securities reclassified into earnings, before tax	0	[1]	0	[1]	0	[1]	613	[1]
Net losses (gains) on securities reclassified into earnings, tax	0	[1]	0	[1]	0	[1]	220	[1]
Net losses (gains) on securities reclassified into earnings	0	[1]	0	[1]	0	[1]	393	[1]
Net change in fair value of securities available for sale, before tax	(1,489)		(202)		2,312		(7,158)
Net change in fair value of securities available for sale, tax	(536)		(73)		836		(2,548)
Net change in fair value of securities available for sale	(953)		(129)		1,476		(4,610)
Reclassification adjustment for other-than-temporary impariment losses transferred into earnings, before tax					0	[2]	2,159	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, tax					0	[2]	775	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings	0		0		0	[2]	1,384	[2]
Change in fair value of cash flow hedges, before tax	(10)		(72)		(34)		(27)
Change in fair value of cash flow hedges, tax	(11)		(25)		(5)		(12)
Change in fair value of cash flow hedges	1		(47)		(29)		(15)
Net cash flow hedge losses reclassified into earnings, before tax	145	[3]	141	[3]	434	[3]	515	[3]
Net cash flow hedge losses reclassified into earnings, tax	53	[3]	50	[3]	157	[3]	184	[3]
Net cash flow hedge losses reclassified into earnings	92	[3]	91	[3]	277	[3]	331	[3]
Net change in fair value of cash flow hedges, before tax	135		69		400		488
Net change in fair value of cash flow hedges, tax	42		25		152		172
Net change in fair value of cash flow hedges	93		44		248		316
Defined benefit plan obligation adjustment, before tax	126	[4]	17,842	[4]	380	[4]	18,751	[4]
Defined benefit plan obligation adjustment, tax	45	[4]	6,402	[4]	130	[4]	6,682	[4]
Defined benefit plan obligation adjustment, net of tax	81	[4]	11,440	[4]	250	[4]	12,069	[4]
Total other comprehensive (loss) income, before tax	(1,228)		17,709		3,092		14,240
Total other comprehensive (loss) income, tax	(449)		6,354		1,118		5,081
Total other comprehensive (loss) income, net of tax	$ (779)		$ 11,355		$ 1,974		$ 9,159

[1] Reported as total other-than-temporary impairment losses on securities in the Consolidated Statements of Income.

[2] Reported as the portion of loss recognized in other comprehensive income in the Consolidated Statements of Income.

[3] Included in interest expense on junior subordinated debentures in the Consolidated Statements of Income.

[4] Included in salaries and employee benefits expense in the Consolidated Statements of Income.