Salary Deferral Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Salary Deferral Plan [Abstract]
Employees contributions (in hundredths)	50.00%
Employer matching contribution to first 4% (in hundredths)	100.00%
Percentage of employee self-directed contributions matched by employer (in hundredths)	4.00%
Compensation expense	$ 2,185,000	$ 1,887,000	$ 1,931,000
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Compensation expense	2,185,000	1,887,000	1,931,000
Other liabilities	48,252,519	42,097,132
Calvary SRAs [Member]
Salary Deferral Plan [Abstract]
Compensation expense	201,000	330,000	63,000
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Period to distribute accumulated gains to participant	15 years
Compensation expense	201,000	330,000	63,000
Number of participant accepting the settlement	11
Number of remaining participant in agreements	2
Other liabilities	$ 1,301,000	$ 1,200,000	$ 994,000
Discount rate of fair value of future obligation owed to remaining participants (in hundredths)	5.00%	5.00%	5.00%