Bank Branches › Closed and merged banks › Texas › Security State Bank
What happened to Security State Bank?
Security State Bank in Anahuac, TX merged into Post Oak Bank, N.A. of Houston, TX on Dec 1, 2015. After 2 more changes of hands, what was Security State Bank is today part of Prosperity Bank (El Campo, TX).
The chain, step by step
From the day it opened to the bank at the end of the chain today. Each step is one entry in the FDIC's record.
- 1925Security State Bank opens in Anahuac, TX
- Dec 1, 2015MERGEDSecurity State Bank merged into Post Oak Bank, N.A. of Houston, TX.FDIC certificate 11552 ends; its business continues under certificate 57729.
- Oct 1, 2018MERGEDPost Oak Bank, N.A. of Houston, TX merged into Allegiance Bank of Houston, TX.FDIC certificate 57729 ends; its business continues under certificate 58629.
- Jul 1, 2026MERGEDAllegiance Bank (by then renamed Stellar Bank) of Houston, TX merged into Prosperity Bank of El Campo, TX.FDIC certificate 58629 ends; its business continues under certificate 16835.
- TodayOPEN
Prosperity BankMain office El Campo, TX · FDIC certificate 16835 · 344 offices in 2 states on June 30, 2026Every Prosperity Bank office → Website on file with the FDIC: www.prosperitybankusa.com
If you still have something from Security State Bank
A lien that was never released
If a paid-off mortgage, home-equity line or car loan still shows Security State Bank as lienholder, start with Prosperity Bank. In a merger the surviving bank takes over the other bank's loans, so it is the bank to ask for a recordable lien release; if the loan was sold along the way, it can tell you to whom.
The FDIC says it cannot process lien releases for banks that merged or were acquired without government assistance, which is what the record shows here.
Record the release with the same county office that recorded the original mortgage or deed of trust.
An old account, passbook or CD
Ask Prosperity Bank to search for the account under the name Security State Bank. A passbook or certificate shows an account existed. It doesn't show the money is still there, and the OCC notes that federal rules require banks to keep most account records for five years.
Accounts nobody touches are eventually turned over to a state. The OCC puts the usual wait at three to five years with no activity, set by each state's law. Search the unclaimed-property program of the state of the owner's last known address on the bank's records, and any other state they lived in. It is free to search and to claim through a state's own site, and MissingMoney.com, an official site of the state administrators' association, searches most states at once.
A safe deposit box
Ask Prosperity Bank which branch now holds boxes from the Security State Bank office you used. The OCC says a box with no activity for three to five years (the period is set by state statute) is likely treated as dormant, and its contents may be turned over to the state's unclaimed-property program.
Box contents are not covered by FDIC insurance.
Not sure this is your bank?
Many banks shared a name. Match the city and the years above against your paperwork, or search again with the town.
Credit unions were never FDIC-insured and are not in this record; the NCUA credit union lookup covers those. Banks that closed before about 1970 are not in the FDIC's list either.
One caution: banks also sell single branches. If the office you used was sold to a different bank along the way, the account went with the branch, not with this chain. The office list below shows which bank each office reports under now.
This page is drawn from FDIC records and federal guidance. It is not legal advice, and BankBranches is not a bank or a government office. More detail: lien releases · old passbooks and CDs · safe deposit boxes · unclaimed money.
Where the guidance comes from ▾
Its offices in the FDIC deposit reports
3 offices filed under this charter in some year from 1994 on. 2 are still open as of June 30, 2026.
| Office | Now |
|---|---|
| 501 N Cleveland StDayton, TX | OpenStellar Bank |
| 1500 Miller StreetAnahuac, TX | OpenStellar Bank |
| 1302 N. Main StreetLiberty, TX | No longer reported |
Source: FDIC BankFind institution and history records, read Nov 15, 2026. The FDIC's list covers banks that ended in about 1970 or later. Look up certificate 11552 in the FDIC BankFind Suite to see the government's own entry. Corrections: me@byclaude.net.