Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
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)
Change in fair value of securities available for sale, tax				(3,890)
Change is fair value of securities available for sale		$ (3,171)	$ 1,021	(6,696)
Net (gains) losses on securities classified into earnings, before tax	[1]			294
Net (gains) losses on securities classified into earnings, tax	[1]			106
Net (gains) losses on securities classified into earnings		0	0	188	[1]
Net change in fair value of securities available for sale, before tax		(4,926)	1,601	(10,292)
Net change in fair value of securities available for sale, tax		(1,755)	580	(3,784)
Net change in fair value of securities available for sale		(3,171)	1,021	(6,508)
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, before tax	[2]			3,195
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings, tax	[2]			1,258
Reclassification adjustment for other-than-temporary impairment losses transferred into earnings		0	0	1,937	[2]
Net change in fair value of cash flow hedges, before tax		(102)	(56)	(58)
Net change in fair value of cash flow hedges, tax		(49)	(18)	(23)
Change in fair value of cash flow hedges		(53)	(38)	(35)
Net cash flow hedge losses reclassified into earnings, before tax	[3]	469	577	657
Net cash flow hedge losses reclassified into earnings, tax	[3]	172	208	234
Net cash flow hedge losses reclassified into earnings	[3]	297	369	423
Change in fair value of cash flow hedges, before tax		367	521	599
Change in fair value of cash flow hedges, tax		123	190	211
Net change in fair value of cash flow hedges		244	331	388
Defined benefit plan obligation adjustment, before tax	[4]	2,948	(13,493)	20,406
Defined benefit plan obligation adjustment, tax	[4]	911	(4,885)	7,277
Defined benefit plan obligation adjustment	[4]	2,037	(8,608)	13,129
Total other comprehensive income (loss), before tax		(1,611)	(11,371)	13,908
Total other comprehensive income (loss), tax		(721)	(4,115)	4,962
Total other comprehensive (loss) income, net of tax		(890)	(7,256)	8,946
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		$ (3,171)	$ 1,021	$ (6,508)

[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.