public function getIcon($isNegativeAmount = true)
    {
        switch ($this->getType()) {
            case self::CB:
                $icon = 'credit-card';
                break;
            case self::VIR:
                $icon = 'arrow-circle-o-' . ($isNegativeAmount ? 'up' : 'down');
                break;
            case self::PRE:
                $icon = 'arrow-circle-up';
                break;
            case self::CHQ:
                $icon = 'money';
                break;
            case self::PPL:
                $icon = 'paypal';
                break;
            default:
                $icon = 'money';
        }

        return $icon;
    }