Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Change in fair value of securities available for sale, before tax	$ 1,601		$ (10,586)		$ (4,125)
Change in fair value of securities available for sale, tax	580		(3,778)		(1,459)
Change is fair value of securities available for sale	1,021		(6,808)		(2,666)
Net (gains) losses on securities classified into earnings, before tax	0	[1]	294	[1]	(1,195)	[1]
Net (gains) losses on securities classified into earnings, tax	0	[1]	106	[1]	(427)	[1]
Net (gains) losses on securities classified into earnings	0	[1]	188	[1]	(768)	[1]
Net change in fair value of securities available for sale, before tax	1,601		(10,292)		(5,320)
Net change in fair value of securities available for sale, tax	580		(3,672)		(1,886)
Net change in fair value of securities available for sale	1,021		(6,620)		(3,434)
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, before tax	0	[2]	3,195	[2]	193	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, tax	0	[2]	1,146	[2]	68	[2]
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings	0	[2]	2,049	[2]	125	[2]
Net change in fair value of cash flow hedges, before tax	(56)		(58)		(521)
Net change in fair value of cash flow hedges, tax	(18)		(23)		(188)
Change in fair value of cash flow hedges	(38)		(35)		(333)
Net cash flow hedge losses reclassified into earnings, before tax	577	[3]	657	[3]	706	[3]
Net cash flow hedge losses reclassified into earnings, tax	208	[3]	234	[3]	252	[3]
Net cash flow hedge losses reclassified into earnings	369	[3]	423	[3]	454	[3]
Change in fair value of cash flow hedges, before tax	521		599		185
Change in fair value of cash flow hedges, tax	190		211		64
Net change in fair value of cash flow hedges	331		388		121
Defined benefit plan obligation adjustment, before tax	(13,493)	[4]	20,406	[4]	(8,445)	[4]
Defined benefit plan obligation adjustment, tax	(4,885)	[4]	7,277	[4]	(3,029)	[4]
Defined benefit plan obligation adjustment	(8,608)	[4]	13,129	[4]	(5,416)	[4]
Total other comprehensive income (loss), before tax	(11,371)		13,908		(13,387)
Total other comprehensive income (loss), tax	(4,115)		4,962		(4,783)
Total other comprehensive (loss) income, net of tax	(7,256)		8,946		(8,604)
Net Unrealized Gains on AFS Securities [Member]
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Total other comprehensive (loss) income, net of tax	$ 1,021		$ (6,620)		$ (3,434)

[1] Reported as net realized gains on securities and 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.