An institution organized by the banks of a city, where their messengers may meet daily, adjust balances of accounts, and receive and pay differences. Crane v. Bank, 173 Pa. 500, 34 Atl. 296; National Exch. Bank v. National Bank of North America, 132 Mass. 147; Philler v. Patterson, 168 Pa. 468, 32 Atl. 26, 47 Am. St Rep. 896.