Methodology & sources
Year-to-date net interest income (RIAD4074), annualized by multiplying with 4 / quarter number, divided by total assets at the quarter end (item 2170). Reported on total assets, not on average earning assets — it is therefore slightly below the classic net interest margin and is labelled accordingly.
One row per reporting institution (RSSD) as of 2009-09-30; percentiles computed in the database via percentile_cont, never by a model. Source: FFIEC Call Reports (public domain). Data: FACTANKER registry, precomputed 2026-09-03.

Not claimed

Population is Call Report filers (FDIC-insured commercial banks and savings institutions). Credit unions, holding companies and non-US banks are not part of it.
One row per reporting institution (RSSD), not per banking group: a holding company with three bank subsidiaries counts three times.
Income statement items are year-to-date, not quarterly. Ratios marked annualized are multiplied by 4 / quarter number; net income is not.
The state of an institution is its current head-office state from the Call Report directory, applied to all of its quarters.
Comparisons across 2011Q4 / 2012Q1 are not pure market movement: thrift institutions moved from the Thrift Financial Report into the Call Report in 2012Q1 (filers 6,789 -> 7,377).
sample_fact_ids evidence the three largest institutions of the class, not every number in the distribution.

10th percentile	1.9%
25th percentile	2.6%
Median	2.9%
75th percentile	3.1%
90th percentile	3.5%
Mean	2.8%
Minimum	-1.2%
Maximum	4.2%

Banks in Massachusetts — Net Interest Income / Assets (annualized), 2009Q3

Evidence samples

Largest institutions in this group