Any financial institution duly incorporated in this state under and pursuant to the laws governing the incorporation of financial institutions, and any financial institution situated and doing business within this state, and the Bank of North Dakota, may be designated a depository of public funds by the proper board as herein defined. The board may select two or more    financial institutions in the same county as depositories, but if more than one financial institution is designated, the board shall deal with the financial institutions selected and designated impartially, both as to the deposit of funds and the withdrawal of funds and the requirement as to bonds. The board shall take into consideration, in selecting and designating the depository or depositories, the condition of each financial institution and the capital, surplus, and general credit thereof.