Investment Securities (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Schedule of Investments [Line Items]
Proceeds from Sale of Available-for-sale Securities, Total	$ 78,911,000	$ 71,162,000
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	84,700,000		96,100,000
Excess Subordination As Percentage Of Remainging Performing Collateral	48.90%
Increase (Decrease) in Trading Securities	$ 9,300,000