The board of chosen freeholders of each county shall appoint a clerk to the board for a term of 3 years. He shall keep in a book the minutes and a record of the orders and proceedings of the board. He shall have custody of the official seal of the county and all records, documents and other official papers relating to the property and business of the county and perform such services as the board from time to time shall direct.
Any person, appointed to the office of clerk of a board of chosen freeholders, having held such office continuously for a term of 20 years from the date of his original appointment, shall not be removed from his office except for good cause shown after a fair and impartial hearing upon notice and before the entire board. Every such clerk shall hold his office during good behavior and shall not be removed except for cause as aforesaid.