Income Taxes Deferred Tax Asset and Liabilities (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits	$ 1,046,000	$ 1,175,000	$ 1,454,000	$ 1,392,000
Components of Deferred Tax Assets and Liabilities [Abstract]
Deferred Tax Assets, Other	44,963,000	45,517,000
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Provision for Loan Losses	5,911,000	6,131,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost	2,111,000	2,941,000
Deferred Tax Assets, Capital Loss Carryforwards	39,272,000	39,399,000
Capital Loss Carryforwards, Valuation Allowance	(39,272,000)	(39,399,000)
deferred tax asset lower of cost or fair value on loans held for sale	2,080,000	0
deferred tax asset amortization of premiums on capital investments	1,352,000	1,220,000
Valuation Allowance, amortization of premiums on capital investments	(1,352,000)	(1,220,000)
Deferred Tax Assets, Other	2,333,000	3,057,000
Deferred Tax Assets, Gross	57,398,000	57,646,000
deferred tax liabilities securities	13,160,000	12,139,000
deferred tax liabilities unrealized gains	39,829,000	42,738,000
Entity Not Subject to Income Taxes, Difference in Bases, Amount	1,118,000	2,916,000
Deferred Tax Liabilities, Other	168,000	103,000
Deferred Tax Liabilities, Gross	54,275,000	57,896,000
Deferred Tax Asset/(Liability), Net	3,123,000	(250,000)
Deferred Tax Assets, Valuation Allowance	$ 40,600,000	$ 40,619,272