Other Comprehensive Income (Loss) (Activity in Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015		Dec. 31, 2014
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Change in fair value of securities available for sale, before tax		$ (12,502)	$ (4,926)		$ 1,601
Change in fair value of securities available for sale, tax		(4,626)	(1,755)		580
Change is fair value of securities available for sale		(7,876)	(3,171)		1,021
Net (gains) losses on securities classified into earnings, before tax		0	0		0
Net (gains) losses on securities classified into earnings, tax		0	0		0
Net (gains) losses on securities classified into earnings		0	0		0
Net change in fair value of securities available for sale, before tax		(12,502)	(4,926)		1,601
Net change in fair value of securities available for sale, tax		(4,626)	(1,755)		580
Net change in fair value of securities available for sale		(7,876)	(3,171)		1,021
Net change in fair value of cash flow hedges, before tax		(403)	(102)		(56)
Net change in fair value of cash flow hedges, tax		(146)	(49)		(18)
Change in fair value of cash flow hedges		(257)	(53)		(38)
Net cash flow hedge losses reclassified into earnings, before tax		0	469	[1]	577	[1]
Net cash flow hedge losses reclassified into earnings, tax		0	172	[1]	208	[1]
Net cash flow hedge losses reclassified into earnings		0	297	[1]	369	[1]
Change in fair value of cash flow hedges, before tax		(403)	367		521
Change in fair value of cash flow hedges, tax		(146)	123		190
Net change in fair value of cash flow hedges		(257)	244		331
Defined benefit plan obligation adjustment, before tax		(4,106)	1,478		(14,000)
Defined benefit plan obligation adjustment, tax		(1,518)	376		(5,067)
Defined benefit plan obligation adjustment		(2,588)	1,102		(8,933)
Amortization of net actuarial losses, before tax	[2]	1,075	1,494		531
Amortization of net actuarial losses, tax	[2]	397	542		190
Amortization of net actuarial losses	[2]	678	952		341
Amortization of net prior service credits, before tax	[2]	(24)	(24)		(24)
Amortization of net prior service credits, tax	[2]	(9)	(7)		(8)
Amortization of net prior service credits	[2]	(15)	(17)		(16)
Net change in defined benefit plan obligations, before tax		(3,055)	2,948		(13,493)
Net change in defined benefit plan obligations, tax		(1,130)	911		(4,885)
Net change in defined benefit plan obligations		(1,925)	2,037		(8,608)
Total other comprehensive income (loss), before tax		(15,960)	(1,611)		(11,371)
Total other comprehensive income (loss), tax		(5,902)	(721)		(4,115)
Total other comprehensive (loss) income, net of tax		(10,058)	(890)		(7,256)
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		$ (7,876)	$ (3,171)		$ 1,021

[1] The pre-tax amount is included in interest expense on junior subordinated debentures in the Consolidated Statements of Income.

[2] The pre-tax amount is included in salaries and employee benefits expense in the Consolidated Statements of Income.