You should use ng-blur instead
A blur event fires when an element has lost focus.

<input type="text" ng-model="custname" ng-blur="findCustName()">

If you do not want to use ng-blur or lost focus, you can use the same ng-change with ng-model-options
As of Angular 1.3, you could use Angular ng-model-options directive

<input ng-change="findCustName()" ng-model-options="{debounce:1000}">

When I want to call a function when typing is completed I use ng-keyup .
Using ng-keyup your function will be call every time user press a key.
I know your asking when user finish typing , but let me explain why I prefer using ng-keyup and not ng-blur
If I have to call a validation function, ng-blur won't help, because you will have to focus out to launch the function. Using ng-keydown , function will be launch. so if user finished typing it will be launch also

我用这个函数在输入新值后调用。

ng-model-options="{ updateOn: 'blur' }" watch-selection