This excerpt taken from the CSFL 10-K filed Mar 12, 2007.
(g) Premises and equipment
Company premises and equipment are stated at cost less accumulated depreciation. Depreciation is provided on a straight-line basis over the estimated useful lives of the related assets (3 to 40 years). Leasehold improvements are depreciated over the shorter of their useful lives or the term of the lease. Major renewals and betterments of property are capitalized; maintenance, repairs, and minor renewals and betterments are expensed in the period incurred. Upon retirement or other disposition of the asset, the asset cost and related accumulated depreciation are removed from the accounts, and gains or losses are included in income.