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1·They cannot afford to have idle funds.

银行付不起让资金闲置的代价。

2·Don't let state funds lie idle.

不要积压国家资金。《新英汉大辞典》

3·The capitals lent shall be limited for the use of idle loans after fully paying deposit reserve funds, keeping payment funds and returning the loans due of the People's Bank of China.

拆出资金限于交足存款准备金、留足备付金和归还中国人民银行到期贷款之后的闲置资金。