Bank (noun) is a classic English homograph—same spelling, same pronunciation, utterly different origins and meanings.
From Italian banco ("bench, moneychanger's table") → Old French banque → English. The bench where medieval Lombard merchants sat in marketplaces to exchange coins, lend, and settle debts. Evolved into the institution: a licensed depository, lender, and payment-system node.
From Old Norse bakki ("ridge, mound") → Old English banc → Middle English bank. The sloping land confining a watercourse. Geomorphologically, the zone between the channel bed and the floodplain—critical for riparian ecology, erosion control, and flood dynamics.
Pure coincidence. The financial sense entered English via Norman French post-1066; the river sense is Germanic, rooted in the North Sea coastlands of the Angles, Saxons, and Jutes. By Middle English, both spelled "bank."
"I'm going to the bank" → ATM or river walk? Usually clear from context. If not, English speakers disambiguate instinctively—a tiny daily triumph of linguistic processing.