get latest by each client

I want to get the latest grouping by idx of each bank.
result like this
2011-02-11 11:08:32.700 BOFA   BANK OF AMERICA
2011-01-11 11:09:32.700 CHS     CHASE BANK
2011-02-12 11:09:32.700 AMC     AMERICAN HOME

Here is a sample table





MODIFIED DATE                IDX       BANK_NAME
2011-02-10 11:07:32.700 BOFA   BANK OF AMERICA
2011-02-11 11:08:32.700 BOFA   BANK OF AMERICA
2011-01-10 11:09:32.700 AMC     AMERICAN HOME
2011-01-10 11:09:32.700 CHS     CHASE BANK
2011-01-10 11:09:32.700 AMC     AMERICAN HOME
2011-02-11 11:09:32.700 BOFA   BANK OF AMERICA
2011-01-11 11:09:32.700 CHS     CHASE BANK
2011-02-12 11:09:32.700 AMC     AMERICAN HOME