A error shows up when I am trying to click on a button. Help me?

So I am trying to make a bank ATM. I made the gui so it is like I have a textbox then 2 buttons. 1 Button says 'Deposit' and the other one says 'Withdraw'. So when I enter a amount and then click on any of those buttons this error shows up:

07:45:56.117 - Players.iiLevelMaker.PlayerGui.ATMGui.Container.withdraw.LocalScript:9: attempt to compare string with number

This is the script for deposit:

local player = game:GetService('Players').LocalPlayer
local gui = player:WaitForChild('PlayerGui'):WaitForChild('ATMGui')
local button = gui:WaitForChild('Container').deposit
local amountbox = gui:WaitForChild('Container').TextBox
local cash = player.leaderstats.Cash
local bank = player.leaderstats.Bank

function MouseClick()
    if cash.Value >= amountbox.Text then
        bank.Value = bank.Value +amountbox.Text
        cash.Value = cash.Value -amountbox.Text
    end
end

button.MouseButton1Click:connect(MouseClick)

This is the script for withdraw:

local player = game:GetService('Players').LocalPlayer
local gui = player:WaitForChild('PlayerGui'):WaitForChild('ATMGui')
local button = gui:WaitForChild('Container').withdraw
local amountbox = gui:WaitForChild('Container').TextBox
local cash = player.leaderstats.Cash
local bank = player.leaderstats.Bank

function MouseClick()
    if bank.Value >= amountbox.Text then
        cash.Value = cash.Value +amountbox.Text
        bank.Value = bank.Value -amountbox.Text
    end
end

button.MouseButton1Click:connect(MouseClick)