Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 12,252	$ 12,183
Unrealized losses on securities
Change in fair value of securities available for sale	(777)	(161)
Less: net security losses (gains) reclassified into earnings	0	0
Net change in fair value of securities available for sale	(777)	(161)
Unrealized gains (losses) on cash flow hedges
Change in fair value of cash flow hedges	(3)	31
Less: net cash flow hedge losses reclassified into earnings	836	765
Net change in fair value of cash flow hedges	833	796
Amortization of certain costs included in net periodic retirement costs	1	23
Total other comprehensive income	57	658
Total comprehensive income	$ 12,309	$ 12,841

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

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Net of tax amount of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost.

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