The Call Reporting instructions state that, unless the loan is both well-secured and in the process of collection (i.e. litigation, foreclosure), it must be placed in non-accrual when it reaches 90 days past due. There is an exception for consumer loans and loans secured by 1 - 4 family residential property but states that these loans should be subject to other methods of evaluation to assure that the bank's income is not materially overstated.
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Just my 2 cents worth--for what its worth!!