Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
COMPREHENSIVE INCOME
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ 3,904		$ (7,496)		$ 7,191		$ (8,736)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	(1,521)		2,910		(2,837)		3,365
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	2,383		(4,586)		4,354		(5,371)
Net Security Gains Losses Reclassified Into Earnings Before Tax Amount	(20)		4		71		(4)
Net Security Gains Losses Reclassified Into Earnings Tax Amount	(8)		1		29		(1)
Net Security Gains Losses Reclassified Into Earnings Net Of Tax Amount	(12)		3		42		(3)
Change in fair value of securities available for sale, pre tax amount	3,924		(7,500)		7,120		(8,732)
Change in fair value of securities available for sale, tax (expense) benefit	(1,529)		2,911		(2,808)		3,364
Change in fair value of securities available for sale, after tax amount	2,395		(4,589)		4,312		(5,368)
Change in fair value of cash flow hedges, pre tax amount	487		(1,294)		787		(1,289)
Change in fair value of cash flow hedges, tax (expense) benefit	200		(529)		323		(526)
Change in fair value of cash flow hedges, after tax amount	(287)		765		(464)		763
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax	1,063	[1]	1,443	[1]	2,211	[1]	2,859	[1]
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	434	[1]	589	[1]	903	[1]	1,168	[1]
Net cash flow hedge losses reclassified into interest on borrowings expense, after tax	(629)	[1]	(854)	[1]	(1,308)	[1]	(1,691)	[1]
Loss on termination of hedge reclassified into noninterest expense, pre tax	(1,121)	[1]			(1,121)	[1]
Loss on termination of hedge reclassified into noninterest expense, tax benefit	458	[1]			458	[1]
Loss on termination of hedge reclassified into noninterest expense, after tax	(663)	[1]			(663)	[1]
Net change in fair value of cash flow hedges, pre tax amount	1,697		2,737		2,545		4,148
Net change in fair value of cash flow hedges, tax (expense) benefit	(692)		(1,118)		(1,038)		(1,694)
Net change in fair value of cash flow hedges	1,005		1,619		1,507		2,454
Amortization of certain costs included in net periodic retirement costs, pre tax amount	(66)	[2]	51	[2]	(132)	[2]	73	[2]
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	27	[2]	(9)	[2]	54	[2]	(30)	[2]
Amortization of certain costs included in net periodic retirement costs, after tax amount	(39)	[2]	42	[2]	(78)		43
Total other comprehensive income, pre tax amount	5,555		(4,712)		9,533		(4,511)
Total other comprehensive income, tax (expense) benefit	(2,194)		1,784		(3,792)		1,640
Total other comprehensive income (loss)	$ 3,361		$ (2,928)		$ 5,741		$ (2,871)

[1] cludes the amortization of the remaining balance of a realized but unrecognized gain, net of tax, from the termination of interest rate swaps in June 2009. The original gain of $1.4 million, net of tax, is being recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $643,000 and $787,000 at June 30, 2014 and 2013, respectively.

[2] The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2013, filed with the Securities and Exchange Commission.