Employee Benefits (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Plan h shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares
Employee Benefits [Abstract]
Number of retirement savings plan | Plan	2
Employee Stock Ownership Plan ("ESOP") [Member]
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Maximum annual contribution percentage under ESOP	4.00%
Contributions to ESOP by employer | $	$ 1.5	$ 1.5	$ 1.5
Number of allocated shares under ESOP (in shares) | shares	765,630	752,710	746,260
401(k) Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Minimum age of employees to participate in plan	21 years
Minimum requisite service period to participate in retirement plans	1 year
Minimum annual working hours required to participate in plan | h	1,000
Percentage of employee contribution, minimum	1.00%
Percentage of employee contribution, maximum	20.00%
Employer matching contribution	50.00%
Maximum contribution on employees gross pay	4.00%
Contribution by employer under 401(K) plan | $	$ 1.0	$ 1.0	$ 1.0
Number of allocated shares under 401 (K) plan (in shares) | shares	515,062	503,082	487,330