Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 127,958
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	138,385
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	204,516
Certificates Of Deposit under $100,000, Due in over 12 months	89,599
Certificates Of Deposit under $100,000	560,458
Other Time Deposits under $100,000, Due in 3 months or less	24,461
Other Time Deposits under $100,000, Due in over 3 through 6 months	26,894
Other Time Deposits under $100,000, Due in over 6 through 12 months	40,782
Other Time Deposits under $100,000, Due in over 12 months	60,480
Other Time Deposits under $100,000	152,617
Certificates Of Deposit over $100,000, Due in 3 months or less	568,920
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	389,874
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	228,341
Certificates Of Deposit over $100,000, Due in over 12 months	306,176
Certificates Of Deposit over $100,000	1,493,311
Other Time Deposits over $100,000, Due in 3 months or less	5,095
Other Time Deposits over $100,000, Due in over 3 through 6 months	6,606
Other Time Deposits over $100,000, Due in over 6 through 12 months	11,734
Other Time Deposits other $100,000, Due in over 12 months	11,087
Other Time Deposits over $100,000	34,522
Due in 3 months or less, Total	726,434
Due in over 3 through 6 months, Total	561,759
Due in over 6 through 12 months, Total	485,373
Due in over 12 months, Total	467,342
Total	2,240,908
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 1,300,000