Investment Securities (Narrative) (Details) (USD $)	9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities, Total	$ 90,773,000	$ 114,583,000
Reclassification Of Available For Sale Investment Securities To Held To Maturity At Fair Value	75,700,000
Available-for-sale Securities, Gross Unrealized Gain, Total	63,000
Available-for-sale Securities Pledged as Collateral	102,800,000		96,100,000
Excess Subordination As Percentage Of Remaining Performing Collateral	(46.30%)
Decline in fair value of securities	1,200,000
Gross unrealized losses	8,236,000		16,316,000
ALESCO Preferred Funding VII [Member]
Schedule of Investments [Line Items]
Gross unrealized losses	(779,000)
Collateralized mortgage obligations [Member]
Schedule of Investments [Line Items]
Gross unrealized losses	$ 24,000		$ 0