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Employee Benefit Plans - Employee Stock Ownership Plan (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 29, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 23, 2005
Compensation Related Costs, Retirement and Share Based Payment [Line Items]          
ESOP compensation expense   $ 1,100,000   $ 1,100,000  
Loan receivable from ESOP         $ 19,600,000
ESOP issued price (usd per share)     $ 10    
ESOP cash contributions     $ 0 1,100,000  
ESOP, dividends and interest received       $ 50,000  
Employee Stock Ownership Plan (ESOP), Shares in ESOP [Abstract]          
Allocated to participants (shares)     885,896 1,203,810  
Distributed to participants     (885,896) (317,914)  
Total ESOP shares (shares) 78,362   0 885,896  
Common Stock [Member]          
Compensation Related Costs, Retirement and Share Based Payment [Line Items]          
Repayments of Debt, Equity Instrument Consideration, Shares Issued 753,490        
ESOP shares purchased (shares)     1,957,300    
Share Acquisition Loan [Member]          
Compensation Related Costs, Retirement and Share Based Payment [Line Items]          
Loans Payable     $ 0 $ 0