Securities (Narrative) (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]
Fair Value of Available for Sale and Held to Maturity securities pledged as collateral	$ 469,100,000	$ 558,200,000
Amortized cost of trust preferred securities of individual name issuers that are below investment grade	11,800,000
Unrealized losses of trust preferred securities of individual name issuers that are below investment grade	2,500,000
Amortized cost of the first trust preferred security of pooled issuers on nonaccrual status	2,800,000
Total credit-related impairment losses of the first trust preferred security of pooled issuers on nonaccrual status	2,100,000
Current credit-related impairment losses of the first trust preferred security on nonaccrual status	209,000
Unrealized losses of the first trust preferred security of pooled issuers on nonaccrual status	2,200,000
Amortized cost of the second trust preferred security of pooled issuers on nonaccrual status	1,300,000
Total credit-related impairment losses of the second trust preferred security of pooled issuers on nonaccrual status	1,200,000
Unrealized losses of the second trust preferred security of pooled issuers on nonaccrual status	1,100,000
Amortized cost of callable debt securities	91,900,000
Fair value of callable debt securities	$ 85,400,000