Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) (USD $)	Dec. 31, 2011
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 199,626,000
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	221,933,000
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	273,537,000
Certificates Of Deposit under $100,000, Due in over 12 months	241,879,000
Certificates Of Deposit under $100,000	936,975,000
Other Time Deposits under $100,000, Due in 3 months or less	56,576,000
Other Time Deposits under $100,000, Due in over 3 through 6 months	36,415,000
Other Time Deposits under $100,000, Due in over 6 through 12 months	51,541,000
Other Time Deposits under $100,000, Due in over 12 months	84,597,000
Other Time Deposits under $100,000	229,129,000
Certificates Of Deposit over $100,000, Due in 3 months or less	396,840,000
Cerfiticates Of Deposit over $100,000, Due in over 3 through 6 months	253,528,000
Cerfiticates Of Deposit over $100,000, Due in over 6 through 12 months	227,782,000
Cerfiticates Of Deposit over $100,000, Due in over 12 months	269,811,000
Cerfiticates Of Deposit over $100,000	1,147,961,000
Other Time Deposits over $100,000, Due in 3 months or less	42,332,000
Other Time Deposits over $100,000, Due in over 3 through 6 months	34,992,000
Other Time Deposits over $100,000, Due in over 6 through 12 months	78,580,000
Other Time Deposits other $100,000, Due in over 12 months	18,424,000
Other Time Deposits over $100,000	174,328,000
Due in 3 months or less, Total	695,374,000
Due in over 3 through 6 months, Total	546,868,000
Due in over 6 through 12 months, Total	631,440,000
Due in over 12 months, Total	614,711,000
Total	2,488,393,000
Minimum reserve requirement	$ 47,300,000