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Securities (Summary of Expected Maturity Distribution of Debt Securities Available-for-Sale, Other than Mortgage-Backed Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Estimated fair value	$ 1,023,055	$ 1,275,631
Other Than Mortgage Backed Securities [Member]
Amortized cost, Due after one year through five years	110,944
Amortized cost	110,944
Fair value, Amortized cost, Due after one year through five years	110,639
Estimated fair value	$ 110,639

X

- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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