NSB Bank
Mason City, Iowa, Cerro Gordo County
$461M in total assets, the 1,911th largest of 4,309 US banks and 72nd of 227 headquartered in Iowa.
- FDIC certificate
- 8094
- Established
- 1933
- Owned by
- Northwood Finl Services Corp
- Primary regulator
- FDIC
- Website
- www.nsbbank.com
At a glance
Compared with 166 banks headquartered in Iowa with $100 million to $1 billion in assets, as of June 30, 2026.
| Measure | This bank | Percentile | Peer range, middle 90% | Peer median |
|---|---|---|---|---|
| Total assets | $461M | 74% | $277M | |
| Loans | $334M | 76% | $192M | |
| Deposits | $401M | 78% | $234M | |
| Return on assets | 1.09% | 30% | 1.34% | |
| Net interest margin | 3.08% | 18% | 3.65% | |
| Efficiency ratio | 54.2% | 43% | 55.8% | |
| Equity to assets | 8.44% | 13% | 10.59% | |
| Loans to deposits | 83% | 51% | 83% |
Growth
Total assets grew 13.7% a year over the last 5 years and 9.1% a year over 10 years, including 1 acquisition in the last 10 years.
Acquisitions
| Closed | Acquired bank | Assets at acquisition |
|---|---|---|
| Jul 2021 | Titonka Savings Bank Titonka, IA, an affiliate under the same holding company | $197M |
| Feb 1991 | American Federal Savings Association of Iowa Des Moines, IA | $475M |
Where they operate
6 branches in 4 counties.
Largest markets by deposits
| County | Deposits | Market share | Rank |
|---|---|---|---|
| Worth County, IA | $132M | 59.1% | 1 of 3 |
| Cerro Gordo County, IA | $105M | 5.7% | 5 of 9 |
| Winnebago County, IA | $101M | 15.7% | 3 of 4 |
| Kossuth County, IA | $62M | 6.6% | 7 of 9 |
Deposits by branch from the FDIC Summary of Deposits, June 2026. Rank among all banks with branches in that county.
Branch history since 2016
Net gain of 3 branches since 2016 (3 to 6, +100.0%). 0 opened, 3 acquired, 0 closed or sold.
| Period | What happened | Opened or acquired | Closed or sold | Net change | Branches at end |
|---|---|---|---|---|---|
| Start of 2016 | Starting point | 3 | |||
| 2021 | Acquired Titonka Savings Bank | 3 | 0 | +3 | 6 |
Balance sheet and earnings
Loans by type
| Type | Share | This bank | Peers |
|---|---|---|---|
| Commercial real estate | 32% | 17% | |
| Farmland | 19% | 21% | |
| Business (C&I) | 18% | 13% | |
| Agricultural | 17% | 16% | |
| 1-4 family residential | 10% | 23% | |
| Consumer | 1% | 2% | |
| Multifamily | 0% | 3% | |
| Construction and land | 0% | 4% | |
| Other | 1% | 1% |
Deposits by type
| Type | Share | This bank | Peers |
|---|---|---|---|
| Other interest-bearing | 64% | 49% | |
| Noninterest-bearing | 19% | 18% | |
| Time deposits | 17% | 33% |
Brokered deposits are 0.0% of deposits (peers 3.1%).
Return on assets
Trailing four quarters, with the peer median.
Credit and capital
| This bank | Peer median | |
|---|---|---|
| Noncurrent loans | 0.32% | 0.47% |
| Net charge-offs, annualized | 0.30% | 0.00% |
| Reserves to loans | 1.13% | 1.23% |
| Leverage ratio | 8.49% | 10.95% |
Noncurrent loans exclude government-guaranteed portions.
Related banks
Similar size in Iowa
Largest competitors in Worth County, IA
Figures as of June 30, 2026 from the bank's Call Report, FDIC structure and branch data, and the Federal Reserve. Short link: bankingstats.com/nsb