Data and assumptions used in the fair value calculation related to MSRs at December 31, 2011 and 2010, respectively,  are presented below. At December 31, 2011, the weighted average amortization period for MSRs was 4.27 years. Estimated amortization  expense for each of the next five years is presented below. At December 31, 2011, the scheduled maturities of certificates of deposit and other time deposits are presented below. Additionally, at December 31, 2011 and 2010, approximately $169.2 and $190.3 million, respectively, of certificates of  deposit and other time deposits were issued in denominations of $100,000 or greater. At December 31, 2011 and 2010, the amount of deposit accounts in overdraft status that were reclassified to loans on  the accompanying consolidated balance sheets was not material. NOTE 9: DEPOSITS December 31 (Dollars in thousands) 2011 2010 Unpaid principal balance $ 196,069 157,929 Weighted average prepayment speed (CPR) 17.8 % 12.1 Discount rate (annual percentage) 11.0 11.0 Weighted average coupon interest rate 4.4 % 4.6 Weighted average remaining maturity (months) 276 289 Weighted average servicing fee (basis points) 25.0 25.0 (Dollars in thousands) December 31, 2011 2012 $ 309 2013 247 2014 192 2015 148 2016 114 (Dollars in thousands) December 31, 2011 2012 $ 157,841 2013 60,158 2014 25,559 2015 19,308 2016 8,065 Thereafter 10,431 Total certificates of deposit and other time deposits  $ 281,362 page 62