Deposits (Maturities Of Time Open And Certificates Of Deposit Detailed Breakdown By Size Category) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Deposits [Abstract]
Certificates Of Deposit under $100,000, Due in 3 months or less	$ 115,126
Certificates Of Deposit under $100,000, Due in over 3 through 6 months	115,595
Certificates Of Deposit under $100,000, Due in over 6 through 12 months	180,447
Certificates Of Deposit under $100,000, Due in over 12 months	82,789
Certificates Of Deposit under $100,000	493,957
Other Time Deposits under $100,000, Due in 3 months or less	24,019
Other Time Deposits under $100,000, Due in over 3 through 6 months	26,607
Other Time Deposits under $100,000, Due in over 6 through 12 months	36,573
Other Time Deposits under $100,000, Due in over 12 months	53,490
Other Time Deposits under $100,000	140,689
Certificates Of Deposit over $100,000, Due in 3 months or less	484,168
Certificates Of Deposit over $100,000, Due in over 3 through 6 months	197,173
Certificates Of Deposit over $100,000, Due in over 6 through 12 months	216,459
Certificates Of Deposit over $100,000, Due in over 12 months	205,085
Certificates Of Deposit over $100,000	1,102,885
Other Time Deposits over $100,000, Due in 3 months or less	3,744
Other Time Deposits over $100,000, Due in over 3 through 6 months	5,438
Other Time Deposits over $100,000, Due in over 6 through 12 months	9,205
Other Time Deposits other $100,000, Due in over 12 months	10,946
Other Time Deposits over $100,000	29,333
Due in 3 months or less, Total	627,057
Due in over 3 through 6 months, Total	344,813
Due in over 6 through 12 months, Total	442,684
Due in over 12 months, Total	352,310
Total	1,766,864
Aggregate amount of time open and certificates of deposit that exceed the $250,000 FDIC insurance limit	$ 880,900