Employee Benefit Plans (Details Textual) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Employee Benefit Plans
Minimum age required to be considered eligible for plan	21
Period of Employment Required to be Eligible for Plan	3
Minimum number of quarters required to be eligible for employer discretionary contribution	1
Minimum number of hours required to be considered eligible for employer discretionary contribution	501
Number of officers in employment contract	26
401(k) and Profit Sharing Plans
401(k) and Profit Sharing Plans
Percent rate for non-elective safe harbor contribution as component of profit sharing plan	3.00%
Profit Sharing Plan Expense	$ 5,862,000	$ 3,974,000	$ 2,043,000
Maximum percentage of annual compensation allowable for contribution by eligible employees	60.00%
Percentage of amount out of first specific percent of employee's contribution matched under plan	50.00%
Percentage of employee's contribution required to determine the matched amount under the plan	6.00%
Company's contribution to the plan	1,935,000	1,751,000	1,644,000
Deferred Compensation Plans
Deferred Compensation Plans
Percentage of salary for deferral of cash payments	50.00%
Percentage of bonuses and directors fees for deferral of cash payments	100.00%
Total amount deferred	376,000	278,000	362,000
Liability related to obligations of deferred compensation plans	5,042,000	1,255,000
Employee Benefit Plans
Credit earning rate as a percentage of return on equity	50.00%
Total earnings for the plan	515,000	231,000	54,000
Supplemental Employee Retirement Plan (SERP)
Employee Benefit Plans
Company's contribution to the plan	76,000	47,000	21,000
Credit earning rate as a percentage of return on equity	50.00%
Total earnings for the plan	$ 48,000	$ 37,000	$ 9,000