ctrl.$setViewValue(_formatContaBanco(scope.model));

ngModel.$formatters.push(function(value) {
   return value.toUpperCase();
});

ngModel.$parsers.push(function(value) {
   return value.toLowerCase();

angular.module('app').directive('contaCorrenteMask', function () {
    return {
        restrict: 'A',
        require: "ngModel",
        link: function (scope, element, attrs, ctrl) {

            var _formatContaBanco = function (data) {

                if (!data)
                    return data;

                if (data.length == 1)
                    return data;

                data = data.replace(/[^0-9]+/g, "");

                var digito = data.slice(-1);
                var conta = data.slice(0, -1);

                return conta + '-' + digito;
            };

            // Send out changes from inside:
            ctrl.$formatters.push(function (modelValue) {
                return _formatContaBanco(modelValue);
            });
        }
    };
})