You can set your custom loop something like this
$a=2;
//In while loop counter increments by one $counter++
if( $query->have_posts() ) : while( $query->have_posts() ) : $query->the_post();
if($a%3!=0){ //Here write function to display title and discription
?>
<div class="col-md-4 col-sm-6">
<div class="cp-attorneys-style-2">
<div class="frame"> <a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>"><?php the_post_thumbnail(''); ?></a>
<div class="caption">
<div class="holder">
<ul>
<li><a href="<?php the_field('mem_twitter'); ?>"><i class="fa fa-twitter"></i></a></li>
<li><a href="<?php the_field('mem_facebook'); ?>"><i class="fa fa-facebook"></i></a></li>
<li><a href="<?php the_field('mem_linkedin'); ?>"><i class="fa fa-linkedin"></i></a></li>
</ul>
<p> </p>
<a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>" class="btn-style-1">Read Profile</a> </div>
</div>
</div>
<div class="cp-text-box">
<h3><a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
<em><?php the_field('mem_titles'); ?></em> </div>
</div>
</div>
<?php
$a = $a+1;
} else {
?>
<div class="col-md-4 col-sm-6">
<?php //Leave this div empty
?>
</div>
<div class="col-md-4 col-sm-6">
<div class="cp-attorneys-style-2">
<div class="frame"> <a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>"><?php the_post_thumbnail(''); ?></a>
<div class="caption">
<div class="holder">
<ul>
<li><a href="<?php the_field('mem_twitter'); ?>"><i class="fa fa-twitter"></i></a></li>
<li><a href="<?php the_field('mem_facebook'); ?>"><i class="fa fa-facebook"></i></a></li>
<li><a href="<?php the_field('mem_linkedin'); ?>"><i class="fa fa-linkedin"></i></a></li>
</ul>
<p> </p>
<a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>" class="btn-style-1">Read Profile</a> </div>
</div>
</div>
<div class="cp-text-box">
<h3><a href="https://wordpress.stackexchange.com/questions/263067/<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
<em><?php the_field('mem_titles'); ?></em> </div>
</div>
</div>
<?php
$a = $a+2;
}
endwhile; wp_reset_postdata(); endif;
Take backup of your code first.