Investment Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Fair Value	$ 458,004	$ 496,815
ALESCO Preferred Funding VII [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Fair Value	44
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Investment Securities Available-for-Sale: Fair Value		$ 2,120

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details