Other Comprehensive Income (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Changes in fair value of securities available for sale, before tax	$ (202)		$ (339)		$ (7,771)		$ (1,032)
Changes in fair value of securities available for sale, tax	(73)		(121)		(2,768)		(356)
Changes in fair value in securities available for sale	(129)		(218)		(5,003)		(676)
Net losses (gains) on securities reclassified into earnings, before tax	0	[1]	0	[1]	613	[1]	(214)	[1]
Net losses (gains) on securities reclassified into earnings, tax	0	[1]	0	[1]	220	[1]	(76)	[1]
Net losses (gains) on securities reclassified into earnings	0	[1]	0	[1]	393	[1]	(138)	[1]
Net change in fair value of securities available for sale, before tax	(202)		(339)		(7,158)		(1,246)
Net change in fair value of securities available for sale, tax	(73)		(121)		(2,548)		(432)
Net change in fair value of securities available for sale	(129)		(218)		(4,610)		(814)
Reclassification adjustment for other-than-temporary impariment losses transferred into earnings, before tax	0	[2]	0	[2]	2,159	[2]	124	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, tax	0	[2]	0	[2]	775	[2]	44	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings	0	[2]	0	[2]	1,384	[2]	80	[2]
Change in fair value of cash flow hedges, before tax	(72)		(198)		(27)		(518)
Change in fair value of cash flow hedges, tax	(25)		(71)		(12)		(187)
Change in fair value of cash flow hedges	(47)		(127)		(15)		(331)
Net cash flow hedge losses reclassified into earnings, before tax	141	[3]	176	[3]	515	[3]	523	[3]
Net cash flow hedge losses reclassified into earnings, tax	50	[3]	63	[3]	184	[3]	187	[3]
Net cash flow hedge losses reclassified into earnings	91	[3]	113	[3]	331	[3]	336	[3]
Net change in fair value of cash flow hedges, before tax	69		(22)		488		5
Net change in fair value of cash flow hedges, tax	25		(8)		172		0
Net change in fair value of cash flow hedges	44		(14)		316		5
Defined benefit plan obligation adjustment, before tax	17,842	[4]	266	[4]	18,751	[4]	799	[4]
Defined benefit plan obligation adjustment, tax	6,402	[4]	95	[4]	6,682	[4]	272	[4]
Defined benefit plan obligation adjustment, net of tax	11,440	[4]	171	[4]	12,069	[4]	527	[4]
Total other comprehensive (loss) income, before tax	17,709		(95)		14,240		(318)
Total other comprehensive (loss) income, tax	6,354		(34)		5,081		(116)
Total other comprehensive (loss) income, net of tax	$ 11,355		$ (61)		$ 9,159		$ (202)

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

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

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

[4] Included in salaries and employee benefits expense in the Consolidated Statement of Income. See Note 12 and the Annual Report on Form 10-K for fiscal year 2012 for additional information.