(a) Except as otherwise expressly provided in this Section, no bank holding company shall acquire control of, or acquire all or substantially all of the assets of a State bank or a national bank whose main banking premises is located in Illinois if, upon consummation of acquisition, the bank holding company, including affiliates of the bank holding company, would control 30% or more of the total amount of deposits which are located in this State at insured depository institutions. For purposes of this Section the words “insured depository institutions” shall mean State banks, national banks, and insured savings associations. For purposes of this Section, the word “deposits” shall have the meaning ascribed to that word in Section 3(1) of the Federal Deposit Insurance Act. For purposes of this Section, the total amount of deposits which are considered to be located in this State at insured depository institutions shall equal the sum of all deposits held at the main banking premises and branches in the State of Illinois of State banks, national banks, and insured savings associations. For purposes of this Section the word “affiliates” shall have the meaning ascribed to that word in § 35.2 of the Illinois Banking Act.
     (b) Notwithstanding the provisions of subsection (a) of this Section, the Commissioner or the appropriate federal banking agency may approve an acquisition of a bank that is in default or in danger of default. The provisions of subsection (a) of this Section may not be waived, whether pursuant to Section 3(d) of the federal Bank Holding Company Act of 1956 or Section 44(d) of the Federal Deposit Insurance Act, except as expressly provided in this subsection (b).