0001408534 2026-03-17 2026-03-17 0001408534 us-gaap:CommonStockMember 2026-03-17 2026-03-17 0001408534 us-gaap:NoncumulativePreferredStockMember 2026-03-17 2026-03-17 0001408534 false 8-K 2026-03-17 FIRST GUARANTY BANCSHARES, INC. LA 001-37621 26-0513559 400 East Thomas Street Hammond LA 70401 (985) 345-7685 false false false false false Common Stock, $1 par value FGBI NASDAQ Depositary Shares (each representing a 1/40th interest in a share of 6.75% Series A Fixed-Rate Non-Cumulative perpetual preferred stock) FGBIP NASDAQ