Former Bank of the Cascades Clients:

If you haven’t already, be sure to update the phone number for First Interstate Bank’s Client Contact Center (1-855-342-3400). The phone numbers previously used to access Bank of the Cascades’ Customer Support Center will not work as of March 6, 2018.

Telephone Banking

Enjoy the convenience of First Interstate Bank's 24 Hour Day & Night Telephone Banking

With telephone banking you can; obtain balance information on your checking, savings, CD, or loan account; verify transactions on your account; make account transfers and have account statements faxed to you.

Before using our Day and Night Telephone Banking service, make sure you have your account number(s) handy. You will also need to know your Personal Identification Number (PIN). The first time you call, your PIN will be the last four digits of your social security or tax ID number of the name that appears first on your account. You will then be instructed to change your PIN to a new four digit number that only you know.

Automated Menu

Our automated telephone banking system is easy to use. Simply follow the instructions given to you over the telephone. You will be offered a series of menu selections from which to choose. Best of all, if you need to talk to one of our customer service personnel, simply press zero. Our customer service representatives are available to help from M-F, 7:30am-7:00pm MST and Sat 10:00am-2:00pm MST.

If you are traveling and you bank at any of these offices or if your branch is not listed, the toll-free number is 888-752-3341.

Location Number
Belgrade (406) 586-9099
Bigfork (406) 756-5292
Billings (406) 255-6000
Bozeman (406) 586-9099
Colstrip (406) 748-4455
Eureka (406) 297-3664
Gardiner (406) 848-7400
Great Falls (406) 454-6244
Hamilton (406) 523-4445
Hardin (406) 665-1112
Helena (406) 442-3530
Lame Deer (406) 477-6000
Livingston (406) 222-4744
Kalispell (406) 756-5292
Miles City (406) 232-5505
Missoula (406) 523-4445
Polson (406) 883-7731
Red Lodge (406) 255-6000
Whitefish (406) 862-7437
Location Number
Buffalo(307) 684-0400
Casper(307) 235-4220
Cheyenne(307) 638-7376
Gillette(307) 687-4404
Jackson(307) 732-7977
Lander(307) 332-8600
Laramie(307) 745-0100
Riverton(307) 856-0100
Sheridan(307) 672-1500

For all South Dakota locations:(877) 239-3840.