Exhibit 10.17 I N D E N T U R E A G R E E M E N T W I T H R E S P E C T T O C A P I T A L N O T E S D A T E D A U G U S T 5, 1 9 9 1 INDENTURE AGREEMENT THIS INDENTURE AGREEMENT is made as of the 5th day of August, 1991, between BRENTON BANKS, INC., a...