Maine
Branch-office deposits reported to the FDIC Summary of Deposits survey by institutions operating in Maine, June 30 of each survey year, 1994–2025. Dollar figures are the survey’s thousands-of-USD unit displayed as $B/$T.
Deposits, 1994–2025
Office-assigned deposits at branches in Maine went from $11.89B in 1994 to $46.13B in 2025, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 1994-2025. State-level aggregate of branch rows. Methodology
Branches and institutions
The branch network in Maine peaked at 521 offices in 2009; the 2025 survey counts 432. The institution count moved from 51 (1994) to 28 (2025).
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 1994-2025. Methodology
Deposit concentration (HHI)
Statewide institution-share HHI: the sum of squared percent shares of each institution’s in-state deposits, 0–10,000. The shaded bands are the agencies’ 2010 Horizontal Merger Guidelines classification (section 5.3): unconcentrated below 1,500, moderately concentrated 1,500–2,500, highly concentrated above 2,500. The dashed line marks the 2023 Merger Guidelines threshold, under which markets with an HHI above 1,800 are highly concentrated (Guideline 1). Maine’s HHI is 696 in 2025 (unconcentrated on the 2010 bands), against 887 in 1994 and a span peak of 3308 in 2009. A statewide HHI is descriptive: merger review defines banking markets locally, not by state.
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | DOJ & FTC, Merger Guidelines (2023), Guideline 1 HHI computed from FDIC Summary of Deposits branch rows, June 30 of each survey year, 1994-2025. Methodology
Largest institutions by in-state deposits, 2025
Branch rows grouped by FDIC certificate; names as reported to the survey. Share is of all SOD deposits booked in Maine that year, the same shares the statewide HHI squares and sums.
| # | Institution | Deposits | Share | Branches |
|---|---|---|---|---|
| 1 | TD Bank, National Association cert 18409 | $6.10B | 13.22% | 31 |
| 2 | Bangor Savings Bank cert 18408 | $5.58B | 12.09% | 63 |
| 3 | The Camden National Bank cert 4255 | $4.55B | 9.86% | 56 |
| 4 | Northeast Bank cert 19690 | $3.41B | 7.38% | 9 |
| 5 | KeyBank National Association cert 17534 | $2.79B | 6.06% | 30 |
| 6 | First National Bank cert 4256 | $2.71B | 5.87% | 18 |
| 7 | Machias Savings Bank cert 19531 | $2.29B | 4.97% | 15 |
| 8 | Maine Community Bank cert 17741 | $2.25B | 4.88% | 23 |
| 9 | Bank of America, National Association cert 3510 | $2.22B | 4.81% | 12 |
| 10 | Bar Harbor Bank & Trust cert 11971 | $1.94B | 4.20% | 22 |
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30, 2025. Deposits are office-assigned; an institution's internal allocation practices shape where its balances appear. Methodology
County concentration extremes, 2025
The most and least concentrated of Maine’s 16 counties in the survey, by county-level deposit HHI. A county served by a single institution sits at the 10,000 ceiling by construction; thin county markets are the norm outside metros.
Most concentrated
| County | HHI | Inst. | Branches |
|---|---|---|---|
| Lincoln | 6090 | 5 | 17 |
| Piscataquis | 5003 | 2 | 4 |
| Sagadahoc | 4891 | 4 | 7 |
| Washington | 4376 | 5 | 18 |
| Somerset | 4119 | 5 | 13 |
Least concentrated
| County | HHI | Inst. | Branches |
|---|---|---|---|
| Cumberland | 1121 | 19 | 120 |
| York | 1321 | 12 | 60 |
| Androscoggin | 1959 | 9 | 20 |
| Aroostook | 2325 | 6 | 23 |
| Kennebec | 2532 | 8 | 29 |
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30, 2025. County HHIs use institution shares of summed branch deposits within the county. Methodology
Back to the national overview, or see the methodology for the survey definition, the HHI construction, and the office-assignment caveat.