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Income Taxes
9 Months Ended
Sep. 30, 2013
Income Tax Expense (Benefit), Continuing Operations [Abstract]  
Income Taxes
Income Taxes:

During the three months ended September 30, 2013, Sterling recognized income tax expense of $8.1 million, reflecting a 28% effective tax rate, and during the nine months ended September 30, 2013, income tax expense of $30.9 million, reflecting a 30% effective tax rate. The nine month comparable 2012 period included an income tax benefit of $288.8 million, the result of reversing substantially all of Sterling's deferred tax asset valuation allowance. The effective tax rates for the 2013 periods reflect permanent differences between book income and tax income from the Borrego acquisition bargain purchase gain, as well as tax exempt municipal bond and BOLI income. As of September 30, 2013, the net deferred tax asset was $282.6 million, including $245.3 million of net operating loss and tax credit carry-forwards, compared with $292.1 million as of December 31, 2012, including $274.0 million of net operating loss and tax credit carry-forwards.