Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
NET INCOME	$ 11,601	$ 11,959	$ 32,658	$ 34,267
UNREALIZED GAINS (LOSSES) ON SECURITIES
Change in Fair Value of Securities Available for Sale	837	(228)	537	545
Less: Net Security Losses (Gains) Reclassified into Earnings	0	17	45	(317)
Net Change in Fair Value of Securities Available for Sale	837	(211)	582	228
UNREALIZED GAINS (LOSSES) ON CASH FLOW HEDGES
Change in Fair Value of Cash Flow Hedges	(929)	(4,110)	(2,125)	(6,518)
Less: Net Cash Flow Hedge Gains Reclassified into Earnings	810	868	2,371	2,366
Net Change in Fair Value of Cash Flow Hedges	(119)	(3,242)	246	(4,152)
AMORTIZATION OF CERTAIN COSTS INCLUDED IN NET PERIODIC RETIREMENT COSTS, AFTER TAX AMOUNT	23	78	69	330
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	741	(3,375)	897	(3,594)
TOTAL COMPREHENSIVE INCOME	$ 12,342	$ 8,584	$ 33,555	$ 30,673

Net of tax amount of the appreciation (loss) in the value of unsold available-for-sale securities.

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