Wall Street's post-election jubilation will be tested once Donald Trump takes office and Americans get a clearer picture of his administration's actual policies on taxes, interest rates, regulation and trade.

Fact is, investors are euphoric over brash campaign promises that haven't been kept yet.

Trump already is backing away from promises that were highly impractical to begin with. Notably, it turns out that Mexico won't pay for the border wall; our friends South of the Border will just be billed for it (good luck with that). Indeed, an undercurrent of growing investor nervousness is reflected by the increase last week in activity in options markets used largely for hedging stocks.

Nonetheless, one bullish trend seems to enjoy sustainable momentum: the upward trajectory of bank stocks. Resilient economic growth, falling unemployment, rising wages and home prices, a recovering energy patch, and tightening monetary policy all add up to healthy earnings and revenue for the financial services sector.

The benchmark iShares US Financials ETF(IYF) - Get Report rose 17% in full-year 2016, compared to 9.5% for the S&P 500(SPY) - Get Report . Year to date, the IYF has gained 1.7% compared to 1% for the S&P 500.

This past week, the Dow Jones Industrial Average came within one point of 20,000, a technically meaningless but psychologically powerful threshold. The "Trump rally" has somewhat faded but it could get new juice from the quarterly earnings results of money center banks scheduled for Friday. Their report cards are expected to be strong, but that also means their shares could take a hit if there's a whiff of disappointment in the numbers.

Another tailwind for bank stocks is Trump's determination to gut banking regulations, especially the Dodd-Frank Wall Street Reform and Consumer Protection Act. It also bodes well for the industry that the president-elect has chosen top banking executives for key positions in his administration. The fact that Trump demonized these "globalist bankers" and promised to crack down on them is either forgotten or written off as campaign rhetoric.

Here are the key events for investors to watch in the week ahead:

Tuesday: President Barack Obama delivers his farewell speech in his hometown of Chicago. He'll probably comment on the condition of the economy during his tenure.

Wednesday: Trump is scheduled to give his first post-election press conference in Manhattan. The Senate Foreign Relations Committee also will begin hearings on the nomination of former Exxon Mobil(XOM) - Get Report CEO Rex Tillerson to be the next Secretary of State. Quarterly earnings are due from Lamb Weston(LW) - Get Report , KB Home(KBH) - Get Report , and Progress Software(PRGS) - Get Report .

Thursday: Quarterly earnings are due from Delta Air Lines(DAL) - Get Report . Also on the docket is the Department of Labor's latest jobless claims report.

Friday: It's a big day for banks, with quarterly earnings due from JPMorgan Chase(JPM) - Get Report , Bank of America(BAC) - Get Report , Wells Fargo(WFC) - Get Report , BlackRock (BLK) - Get Report , First Horizon(FHN) - Get Report , PNC Financial Services (PNC) - Get Report , and FirstRepublic Bank(FRC) - Get Report . Most of these banks are expected by analysts to post year-over-year growth in earnings.

Wells Fargo is a holding in Jim Cramer's Action Alerts PLUS Charitable Trust Portfolio. See how Cramer rates the stock here. Want to be alerted before Cramer buys or sells WFC? Learn more now.

Holiday spending also will be under scrutiny, when the Commerce Department reports data on December retail sales.

Investors are in for a wild ride when the unpredictable Donald Trump assumes the presidency. As an investor facing what promises to be a volatile 2017, you want to be in control of your own destiny. That means being able to predict in advance how much money your investment portfolio will generate. Think it can't be done? Our top analyst has a system that can ensure you will make a profit on more than 80% of your trades, in bull or bear markets. Click here to find out the secret!

John Persinos is an analyst with Investing Daily. At the time of publication, he owned stock in Wells Fargo.