Read the insurance clause in your mortgage and/or loan agreement, but in most cases the lending institution reserves the right to require insurance and deductibles in an amount they feel necessary to protect their interest in the collateral. I know in our bank we will not accept a deductible greater than $1,000 for residential structures .
You will have to contact someone at the City or FEMA for the reasons in the delay. Until FEMA officially declares the property not to be in a flood zone, the lending institution is required by law to require you to have flood insurance coverage
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The opinions expressed are mine and they are not to be taken as legal advice.