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Investment Securities (Detail Textuals 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on debt investments	$ (797)	$ (587)
Pooled Trust Preferred Issues
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss position	2
Below investment grade rated investments as percentage of book value of corporations investments	1.30%
Below investment grade rated investments as percentage of market value of Corporations investments	0.97%
Pooled Trust Preferred Issues \| ALESCO 9A \| Moody's, Ba2 Rating
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on debt investments	395	465
Pooled Trust Preferred Issues \| PRETSL XXVII \| Moody's, Baa3 Rating
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses on debt investments	$ 63	$ 56

Disclosure regarding factors used to determine that the impairment of securities not categorized as either held-to-maturity securities or trading securities (hence equal to available for sale securities) where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the available-for-sale investments determined to be temporarily impaired.

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