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Salary Deferral Plans (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
Rate
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Deferred Compensation Arrangements [Abstract]      
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent | Rate 50.00%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay | Rate 100.00%    
Percentage of employee self-directed contributions matched by employer | Rate 4.00%    
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Compensation expense $ 5,900,000 $ 4,000,000 $ 2,700,000
Other liabilities $ 114,889,760 90,267,267  
Cavalry ESOP [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Number of participant accepting the settlement 11    
Number of remaining participant in agreements 1    
Other liabilities $ 1,000,000 $ 1,200,000 $ 1,300,000
Discount rate of fair value of future obligation owed to remaining participants | Rate 5.00%    
Supplemental Employee Retirement Plan [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Other liabilities $ 33,000,000    
SERP covered by Rabbi Trust [Member]      
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Other liabilities $ 20,000,000