Wonder Bancorp and Harvard Illinois Bancorp have extended the deadline for their merger to May 31, according to a joint news release issued Friday.

The $149 million-asset Wonder Bancorp in May agreed to buy Harvard Savings Bank, certain of its assets and "substantially all" of its liabilities. At the time the deal was expected to close in the third or fourth quarter of 2015.

The agreement was part of the $143 million-asset Harvard Illinois Bancorp's plan to wind down its operations.

Wonder Bancorp, in Wonder, Ill., is the holding company for State Bank.

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