Earnings Release Supplement For the Quarter Ended March 31, 2013 April 24, 2013

Safe Harbor (1) The Reform Act defines the term "forward-looking statements" to include: statements of management plans and objectives, statements regarding the future economic performance, and projections of revenues and other financial data, among others. The Reform Act precludes liability for oral or written forward-looking statements if the statement is identified as such and accompanied by "meaningful cautionary statements identifying important factors that could cause actual results to differ materially from those made in the forward-looking statements." In the course of our presentation, we may discuss matters that are deemed to be forward-looking statements, which are intended to be covered by the safe harbor for “forward-looking statements” provided by the Private Securities Litigation Reform Act of 1995 (the “Reform Act”)(1). Forward-looking statements involve substantial risks and uncertainties, many of which are difficult to predict and are generally beyond our control. Actual results may differ materially and adversely from projected results. We assume no obligation to update any forward-looking statements (including any projections) to reflect any changes or events occurring after the date hereof. Additional information about risks of achieving results suggested by any forward-looking statements may be found in Sterling’s 10-K, 10-Q and other SEC filings, included under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” 2

($000s) 02/28/13 Cash and cash equivalents $15,626 Investments and MBS 1,030 Loans receivable, net 97,262 Core deposit intangible 453 Other assets 27,197 Total assets acquired $141,568 Deposits $118,221 Other liabilities 7,054 Total liabilities assumed 125,275 Net assets acquired $16,293 Cash Paid $6,500 Note assumed and paid 2,249 Total consideration $8,749 Bargain purchase gain $7,544 Acquisition of Borrego Springs Bank, N.A. 3  Completed February 28, 2013  SBA franchise with opportunity to expand  Superior SBA 1502 reporting and collection performance 2 branches, 6 loan offices Retail Branch: LPO: Balance Sheet at Closing  $14.3 million nonperforming assets acquired  $9.8 million of which had guarantees under government programs

Summary: Loan Sale Execution Variance to Fair Value ($5.9) Reduced Valution/Margin on New Q1 '13 Activity (6.8) Reduction in Activity (3.0) Reduction in Brokered Loan Fees (0.8) Total ($16.5) Income From Mortgage Banking Operations 4 (Dollars in Millions) 3/31/2013 12/31/2012 Difference Mortgage Banking Operations $11.1 $27.6 ($16.5) Loan Servicing Fees 2.7 0.6 2.1 Total MBO & Loan Servicing $13.8 $28.2 ($14.4) Three Months Ended  Expect increased Q2 ’13 origination activity due to the hiring of additional lenders in Q1 ‘13 and seasonality factors • Q2 ‘13 origination activity expected in range of $800 million to $900 million • 35% of Q1 ‘13 originations were purchase loans, 12% HARP refi, 53% traditional refi  Expect Q2 ‘13 mortgage margin in range of 2.40% to 2.70% Loan Sale Execution Variance to Fair Value: Amount in Warehouse at 12/31/12 $689.7 Difference in Margin -0.86% Difference ($5.9) Reduced Valution/Margin on New Q1 '13 Activity: Total Mortgage Activity Q1 '13 $650.4 Difference in Margin -1.05% Difference ($6.8) Reduction in Activity: Total Mortgage Activity Q1 '13 $650.4 Total Mortgage Activity Prior Quarter 734.4 Change in Mortgage Activity (84.0) Lost Yield due to Reduced Activity ($3.0)

($ in thousands) Q1 2012 Q2 2012 Q3 2012 Q4 2012 Q1 2013 Salaries Expense $34,213 $32,634 $32,463 $32,927 $31,197 Benefits Expense 9,165 8,523 7,444 7,239 9,534 Bonus and Incentive Expense 8,994 10,465 13,537 17,341 11,795 Deferred Equity Comp Expense 1,664 1,945 1,421 1,329 1,360 Other Personnel Expense 934 919 1,329 1,647 1,743 Deferred Direct Orig Exp (7,589) (8,001) (10,558) (10,960) (13,193) Total Personnel $47,381 $46,485 $45,636 $49,523 $42,436 Bonus Expense $709 $647 $741 $2,332 $1,336 Commission Expense 6,135 6,595 8,881 10,199 7,158 Incentive Expense 1,971 2,998 3,712 4,774 3,032 Awards 179 225 203 36 269 Total Bonus and Incentive Expense $8,994 $10,465 $13,537 $17,341 $11,795 Multifamily Group $478 $760 $396 $1,207 $494 Home Loan Division 5,263 5,479 8,097 8,512 6,374 All Other Departments 394 356 388 480 290 Total Commission Expense $6,135 $6,595 $8,881 $10,199 $7,158 Employee Compensation and Benefits 5 Increase in Benefits Expense primarily related to payroll tax increase Commercial and retail performance based incentive plan decrease in accrual for Q1 Expected decline due to impact of TARP exit in Q4 ‘12 Reflects adjustment of standard deferred costs principally for resi mortgage loans

(in millions) 3/31/2012 6/30/2012 9/30/2012 12/31/2012 3/31/2013 LTM Ending balance $6,013 $6,084 $6,142 $6,253 $6,477 $6,477 $ Growth: Total, net 71 58 111 224 464 Purchased 49 44 27 3 123 Acquired/(divested), net - - (41) 103 62 Sold (50) (2) (10) (7) (69) Organic, net 72 16 135 125 348 % Growth (annualized): Total, net 4.7% 3.8% 7.2% 14.3% 7.7% Purchased 3.3% 2.9% 1.8% 0.2% 2.0% Acquired/(divested), net 0.0% 0.0% -2.7% 6.6% 1.0% Sold -3.3% -0.1% -0.7% -0.5% -1.1% Organic, net 4.8% 1.1% 8.8% 8.0% 5.8% Quarterly Loan Growth Summary  Total portfolio loan balances increased $464 million, or 8% year-over-year  Organic loan growth supplemented with bank acquisition and select bulk purchases  For last 12 months, organic production produced 6% growth, 8% annualized for Q1 ‘13  Selected purchases of residential mortgage and prime indirect auto loans  $211.6 million reduction in loans during 12 months due to NPL resolution 6