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Securities (Narrative) (Detail) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Available-for-sale securities pledged carrying value	$ 498,900,000	$ 514,600,000
Percentage of securities portfolio from one issuer, maximum	10.00%	10.00%
Investments in securities	0.00%	0.00%
Securities Available-for-Sale, Amortized Cost	1,473,000
Available-for-Sale Securities, Continuous Unrealized Loss Position,12 Months or Longer, Unrealized Losses	$ 15,000	$ 0

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

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