Comprehensive Income/Loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
COMPREHENSIVE INCOME
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax	$ (7,502)		$ (186)		$ (8,736)		$ (432)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	2,910		47		3,365		132
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	(4,592)		(139)		(5,371)		(300)
Net Security Gains Losses Reclassified Into Earnings Before Tax Amount	4	[1]	76	[1]	4	[1]	76	[1]
Net Security Gains Losses Reclassified Into Earnings Tax Amount	(1)	[1]	(31)	[1]	(1)	[1]	(31)	[1]
Net Security Gains Losses Reclassified Into Earnings Net Of Tax Amount	3	[1]	45	[1]	3	[1],[2]	45	[1],[2]
Change in fair value of securities available for sale, pre tax amount	(7,498)		(110)		(8,732)		(356)
Change in fair value of securities available for sale, tax (expense) benefit	2,909		16		3,364		101
Change in fair value of securities available for sale, after tax amount	(4,589)		(94)		(5,368)		(255)
Change in fair value of cash flow hedges, pre tax amount	1,294		(2,074)		1,289		(2,021)	[1]
Change in fair value of cash flow hedges, tax (expense) benefit	(529)		847		(526)		825
Change in fair value of cash flow hedges, after tax amount	765		(1,227)		763		(1,196)
Less: net cash flow hedge losses reclassified into earnings, pre tax amount	1,443	[3]	1,346	[3]	2,859	[3]	2,638	[3]
Less: net cash flow hedge losses reclassified into earnings, tax (expense) benefit	(589)	[3]	(550)	[3]	(1,168)	[3]	(1,077)	[3]
Less: net cash flow hedge losses reclassified into earnings, after tax amount	854	[3]	796	[3]	1,691	[2],[3]	1,561	[2],[3]
Net change in fair value of cash flow hedges, pre tax amount	2,737		(728)		4,148		617
Net change in fair value of cash flow hedges, tax (expense) benefit	(1,118)		297		(1,694)		(252)
Net change in fair value of cash flow hedges	1,619		(431)		2,454		365
Amortization of certain costs included in net periodic retirement costs, pre tax amount	51	[4]	39	[4]	73	[4]	77	[4]
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit	(9)	[4]	(16)	[4]	(30)	[4]	(31)	[4]
Amortization of certain costs included in net periodic retirement costs, after tax amount	42	[4]	23	[4]	43		46
Total other comprehensive income, pre tax amount	(4,710)		(799)		(4,511)		338
Total other comprehensive income, tax (expense) benefit	1,782		297		1,640		(182)
Total other comprehensive (loss) income	$ (2,928)		$ (502)		$ (2,871)		$ 156

[1] Net security losses includes pre-tax OTTI credit related losses of $0 for the three and six month ended June 30, 2013 and $76,000 for the three and six months ended June 30, 2012.

[2] Total reclassifications into income for the period were $899,000 and $1,737,000 for the three and six months ending June 30, 2013 and $864,000 and $1,652,000 for the three and six months ending June 30, 2012, respectively.

[3] Includes 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, will be recognized in earnings through December 2018, the original maturity date of the swap. The balance of this gain has amortized to $787,000 and $931,000 at June 30, 2013 and 2012, respectively.

[4] 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, 2012, filed with the Securities and Exchange Commission.