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Interest Bearing Deposits (Major Types Of Interest Bearing Deposits) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Interest bearing demand $ 2,157,376 $ 2,054,994
Money market 6,599,516 6,113,138
Savings 1,136,809 971,185
Time, $100,000 and over 1,604,446 1,765,721
Time less than $100,000 890,451 1,242,257
Total interest bearing deposits 12,388,598 12,147,295
Time deposits that meet or exceed FDIC insurance limit $ 689,300 $ 859,700