Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Change in fair value of securities available for sale, before tax	$ (10,586)		$ (4,125)		$ 2,620
Change in fair value of securities available for sale, tax	(3,778)		(1,459)		998
Change is fair value of securities available for sale	(6,808)		(2,666)		1,622
Net (gains) losses on securities classified into earnings, before tax	294	[1]	(1,195)	[1]	(644)	[1]
Net (gains) losses on securities classified into earnings, tax	106	[1]	(427)	[1]	(229)	[1]
Net (gains) losses on securities classified into earnings	188	[1]	(768)	[1]	(415)	[1]
Net change in fair value of securities available for sale, before tax	(10,292)		(5,320)		1,976
Net change in fair value of securities available for sale, tax	(3,672)		(1,886)		769
Net change in fair value of securities available for sale	(6,620)		(3,434)		1,207
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, before tax	3,195	[2]	193	[2]	137	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, tax	1,146	[2]	68	[2]	49	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings	2,049	[2]	125	[2]	88	[2]
Change in fair value of cash flow hedges, before tax	(58)		(521)		(1,464)
Change in fair value of cash flow hedges, tax	(23)		(188)		(522)
Change in fair value of cash flow hedges	(35)		(333)		(942)
Net cash flow hedge losses reclassified into earnings, before tax	657	[3]	706	[3]	755	[3]
Net cash flow hedge losses reclassified into earnings, tax	234	[3]	252	[3]	269	[3]
Net cash flow hedge losses reclassified into earnings	423	[3]	454	[3]	486	[3]
Change in fair value of cash flow hedges, before tax	599		185		(709)
Change in fair value of cash flow hedges, tax	211		64		(253)
Net change in fair value of cash flow hedges	388		121		(456)
Defined benefit plan obligation adjustment, before tax	20,406	[4]	(8,445)	[4]	(10,502)	[4]
Defined benefit plan obligation adjustment, tax	7,277	[4]	(3,029)	[4]	(3,743)	[4]
Defined benefit plan obligation adjustment	13,129	[4]	(5,416)	[4]	(6,759)	[4]
Total other comprehensive income (loss), before tax	13,908		(13,387)		(9,098)
Total other comprehensive income (loss), tax	4,962		(4,783)		(3,178)
Total other comprehensive income (loss), net of tax	$ 8,946		$ (8,604)		$ (5,920)

[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.