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Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2017
Retirement Benefits [Abstract]
Employee Benefit Plans	EMPLOYEE BENEFIT PLANS 401(k) Plan Customers has a 401(k) profit sharing plan whereby eligible team members may contribute amounts up to the annual IRS statutory contribution limit. Customers provides a matching contribution equal to 50% of the first 6% of the contribution made by the team member. Employer contributions for the years ended December 31, 2017, 2016 and 2015, were $1.9 million, $1.6 million, and $1.1 million, respectively. Supplemental Executive Retirement Plan Customers entered into a supplemental executive retirement plan ("SERP") with its Chairman and Chief Executive Officer that provides annual retirement benefits for a 15-year period upon the later of his reaching the age of 65 or when he terminates employment. The SERP is a defined-contribution type of deferred-compensation arrangement that is designed to provide a target annual retirement benefit of $300,000 per year for 15 years starting at age 65, based on an assumed constant rate of return of 7% per year. The level of retirement benefit is not guaranteed by Customers, and the ultimate retirement benefit can be less than or greater than the target. Customers funds its obligations under the SERP with the increase in cash surrender value of a life insurance policy on the life of the Chairman and Chief Executive Officer which it owns. The present value of the amount owed as of December 31, 2017, was $4.6 million and was included in other liabilities.