With an current version of moderncv
you can do this in the following way.
You need to check the two styles to find out which body and footer are used.
To merge style banking
with casual
call style banking
\moderncvstyle{banking}
and call the body and footer of style casual
in the preambel
\moderncvbody{1} % Body of casual style % <=========================
\moderncvfoot{1} % Footer of casual style % <=========================
Now you have the problem that you will see the footer on every page. To have it not on the first page (of the cv and the letter!) you need to add
\thispagestyle{empty} % <===============================================
to the first page for the cv and the letter.
Please see the following MWE
\documentclass[11pt,a4paper,sans]{moderncv}
% moderncv themes
\moderncvstyle{banking} % casual, classic, banking, oldstyle and fancy
\moderncvcolor{blue}
\usepackage[utf8]{inputenc}
\usepackage[scale=0.75]{geometry}
% personal data
\name{John}{Doe}
\title{Resumé title}
\address{street and number}{postcode city}{country}
\phone[mobile]{+1~(234)~567~890}
\phone[fixed]{+2~(345)~678~901}
\phone[fax]{+3~(456)~789~012}
\email{[email protected]}
\homepage{www.johndoe.com}
\social[linkedin]{john.doe}
\social[twitter]{jdoe}
\social[github]{jdoe}
\extrainfo{additional information}
\photo[64pt][0.4pt]{example-image-a}
\quote{Some quote}
\setlength{\footskip}{66pt}
%\moderncvhead{3} % Header of banking style
\moderncvbody{1} % Body of casual style % <=========================
\moderncvfoot{1} % Footer of casual style % <=========================
\begin{document}
\makecvtitle
\thispagestyle{empty} % <===============================================
\section{Education}
\cventry{year--year}{Degree}{Institution--3}{City--4}{\textit{Grade}--5}{Description--6} % arguments 3 to 6 can be left empty
\cventry{year--year}{Degree}{Institution}{City}{\textit{Grade}}{Description}
\section{Master thesis}
\cvitem{title}{\emph{Title}}
\cvitem{supervisors}{Supervisors}
\cvitem{description}{Short thesis abstract}
\section{Experience}
\subsection{Vocational}
\cventry{year--year}{Job title}{Employer}{City}{}{General description no longer than 1--2 lines.\newline{}%
Detailed achievements:%
\begin{itemize}%
\item Achievement 1;
\item Achievement 2, with sub-achievements:
\begin{itemize}%
\item Sub-achievement (a);
\item Sub-achievement (b), with sub-sub-achievements (don't do this!);
\begin{itemize}
\item Sub-sub-achievement i;
\item Sub-sub-achievement ii;
\item Sub-sub-achievement iii;
\end{itemize}
\item Sub-achievement (c);
\end{itemize}
\item Achievement 3.
\end{itemize}}
\cventry{year--year}{Job title}{Employer}{City}{}{Description line 1\newline{}Description line 2}
\subsection{Miscellaneous}
\cventry{year--year}{Job title}{Employer}{City}{}{Description}
\clearpage
\section{Languages}
\cvitemwithcomment{Language 1}{Skill level}{Comment}
\cvitemwithcomment{\textbf{Language} 2}{\textbf{Skill} level}{Comment}
\cvitemwithcomment{Language 3}{Skill level}{Comment}
\section{Computer skills}
\cvdoubleitem{category 1}{XXX, YYY, ZZZ}{category 4}{XXX, YYY, ZZZ}
\cvdoubleitem{category 2}{XXX, YYY, ZZZ}{category 5}{XXX, YYY, ZZZ}
\cvdoubleitem{category 3}{XXX, YYY, ZZZ}{category 6}{XXX, YYY, ZZZ}
\section{Interests}
\cvitem{hobby 1}{Description}
\cvitem{hobby 2}{Description}
\cvitem{hobby 3}{Description}
\section{Extra 1}
\cvlistitem{Item 1}
\cvlistitem{Item 2}
\cvlistitem{Item 3. This item is particularly long and therefore normally spans over several lines. Did you notice the indentation when the line wraps?}
\section{Extra 2}
\cvlistdoubleitem{Item 1}{Item 4}
\cvlistdoubleitem{Item 2}{Item 5}
\cvlistdoubleitem{Item 3}{Item 6. Like item 3 in the single column list before, this item is particularly long to wrap over several lines.}
\section{References}
\begin{cvcolumns}
\cvcolumn{Category 1}{\begin{itemize}\item Person 1\item Person 2\item Person 3\end{itemize}}
\cvcolumn{Category 2}{Amongst others:\begin{itemize}\item Person 1, and\item Person 2\end{itemize}(more upon request)}
\cvcolumn[0.5]{All the rest \& some more}{\textit{That} person, and \textbf{those} also (all available upon request).}
\end{cvcolumns}
\clearpage
%----- letter ---------------------------------------------------------
% recipient data
\recipient{Company Recruitment team}{Company, Inc.\\123 somestreet\\some city}
\date{January 01, 1984}
\opening{Dear Sir or Madam,}
\closing{Yours faithfully,}
\enclosure[Attached]{curriculum vit\ae{}} % use an optional argument to use a string other than "Enclosure", or redefine \enclname
\makelettertitle
\thispagestyle{empty} % <===============================================
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venenatis.
Albert Einstein discovered that $e=mc^2$ in 1905.
\[ e=\lim_{n \to \infty} \left(1+\frac{1}{n}\right)^n \]
\makeletterclosing
\end{document}
and the resulting pages:
and the second page with footer of style casual
: