Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Net income	$ 42,627	$ 45,436	$ 40,240
Unrealized (losses) gains on securities
Change in fair value of securities available for sale	(1,141)	181	2,007
Less: net security losses (gains) reclassified into earnings	45	88	(95)
Net change in fair value of securities available for sale	(1,096)	269	1,912
Unrealized gains (losses) on cash flow hedges
Change in fair value of cash flow hedges	(2,122)	(7,021)	(7,894)
Less: net cash flow hedge losses reclassified into earnings	3,204	3,198	2,345
Net change in fair value of cash flow hedges	1,082	(3,823)	(5,549)
Amortization of certain costs included in net periodic retirement costs	(26)	(166)	118
Total other comprehensive loss	(40)	(3,720)	(3,519)
Total comprehensive income	$ 42,587	$ 41,716	$ 36,721

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

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