| Region / Service | Phone Number | Notes |
|---|---|---|
| First Financial Bank Customer Care | 1-877-322-9530 | (Mon–Fri 7 a.m.–9 p.m. ET, Sat 8 a.m.–5 p.m. ET) |
| Lost or Stolen Debit Card | 1-800-472-3272 | 24/7 support line |
| Credit Card Customer Service | 1-800-558-3424 | Regional support line |
| Mortgage Customer Support | 1-877-322-9530 | Same as main support |
| First Financial Bank Business Services | 1-877-322-9530 | 24/7 automated support |
MainSource Bank was a community-focused regional bank headquartered in Greensburg, Indiana. It operated as a subsidiary of MainSource Financial Group, Inc., with more than 90 branch locations across Indiana, Kentucky, Ohio, and Illinois.
MainSource built its reputation on personalized community banking, offering a wide range of retail, business, and mortgage banking services. Its tagline was often associated with “providing a better banking experience with a local touch.”
In April 2018, MainSource Bank merged with First Financial Bank, N.A., which is part of First Financial Bancorp (headquartered in Cincinnati, Ohio). After the merger, all MainSource branches were rebranded under the First Financial Bank name, but many former customers and communities still refer to it as MainSource due to its long-standing local presence.
Personal Banking: Checking, savings, CDs, credit cards, mortgages, auto loans, home equity lines of credit.
Business Banking: Small business checking, treasury management, SBA loans, commercial loans.
Wealth & Investment Services: Retirement accounts, financial planning, investment advisory.
Digital Banking: Online banking, bill pay, mobile banking apps.
Today, these services are fully integrated into First Financial Bank’s platform, but customers of MainSource retained access to their accounts without disruption.