<?php 
$details = $block->getOrderDetails();
 ?>
<?php if(isset($details['bankaccountowner'])){?>
<p style="margin-top:10px">Bank Account Owner: <b><?php echo $details['bankaccountowner']; ?></b></p>
<?php } ?>
<?php if(isset($details['iban'])){?>
<p>IBAN: <b><?php echo $details['iban']; ?></b></p>
<?php } ?>
<?php if(isset($details['bic'])){?>
<p>BIC: <b><?php echo $details['bic']; ?></b></p>
<?php } ?>
<?php if(isset($details['bankcompany'])){?>
<p>Bank Company: <b><?php echo $details['bankcompany']; ?></b></p>
<?php } ?>