noun
exchange bank
A bank that specializes in foreign exchange transactions.
為替銀行でドルを円に両替した。
I exchanged dollars for yen at an exchange bank.
Foreign exchange in general; 為替銀行 is the institution that handles such transactions.
Compound of 為替 (かわせ, 'exchange') and 銀行 (ぎんこう, 'bank').