County banking markets / CT / 09160
Northwest HillsConnecticut
FIPS 09160. Branch offices reported to the FDIC Summary of Deposits, June 30 of each survey year, 2023–2025. One of 9 counties in Connecticut’s 2025 survey.
Concentration, 2023–2025
Branch-count HHI squares each institution’s share of the county’s branch offices; deposit HHI squares its share of county deposits. The bands are the 2010 Horizontal Merger Guidelines classification, the dashed line the 1,800 level above which the Federal Reserve reviews a merger centrally. In 2025 this market is moderately concentrated on branches (1,500) and unconcentrated on deposits (1,392).
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | Federal Reserve, Competitive Effects of Mergers and Acquisitions FAQs Both indices computed from the SOD branch rows for this county, June 30 of each survey year. Neither is the Fed's screen HHI: no thrift weighting, no exclusion of specialty and internet banks, no central-booking adjustment. Methodology
Branches and institutions
54 branch offices and 11 institutions in 2023; 40 and 9 in 2025. Deposits booked in the county went from $4.78B to $3.48B, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 2023-2025. Methodology
Who holds the deposits, 2025
Every institution with a branch in the county, ranked by deposits booked here. Both shares are shown because they are the two indices above: squaring and summing the deposit column gives the deposit HHI, the branch column the branch-count HHI.
| # | Institution | Deposits | Deposit share | Branches | Branch share |
|---|---|---|---|---|---|
| 1 | The Torrington Savings Bank cert 16636 | $773.4M | 22.20% | 8 | 20.00% |
| 2 | Northwest Community Bank cert 18229 | $574.1M | 16.48% | 7 | 17.50% |
| 3 | Webster Bank, National Association cert 18221 | $456.5M | 13.10% | 5 | 12.50% |
| 4 | Union Savings Bank cert 18190 | $450.4M | 12.93% | 8 | 20.00% |
| 5 | NBT Bank, National Association cert 7230 | $427.4M | 12.27% | 4 | 10.00% |
| 6 | The National Iron Bank cert 2496 | $273.5M | 7.85% | 4 | 10.00% |
| 7 | Bank of America, National Association cert 3510 | $195.6M | 5.61% | 1 | 2.50% |
| 8 | Manufacturers and Traders Trust Company cert 588 | $178.5M | 5.12% | 2 | 5.00% |
| 9 | Thomaston Savings Bank cert 18258 | $155.0M | 4.45% | 1 | 2.50% |
Source: FDIC Summary of Deposits June 30, 2025. Branch rows grouped by FDIC certificate; names as reported to the survey. Deposit share is n/a where the county's total SOD deposits are zero. Methodology
Back to county banking markets, up to Connecticut, or read the methodology for the two HHI constructions and what they cannot tell you.