(1) Where the assured is over-insured by double insurance, each insurer is bound, as between himself and the other insurers, to contribute rateably to the loss in proportion to the amount for which he is liable under his contract.
     (2) If any insurer pays more than his proportion of the loss, he is entitled to maintain a suit for contribution against the other insurers, and is entitled to the like remedies as a surety who has paid more than his proportion of the debt.