Commitments And Contingencies (Financial Instruments With Off-Balance-Sheet Risk) (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Commitments To Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	$ 5,386,634	$ 5,147,363
Standby Letters Of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	205,692	235,903
Deferred Standby Letter Of Credit Fees [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance-sheet risk	$ 1,379	$ 1,488