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Subsequent Events (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Feb. 05, 2021
Oct. 23, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Subsequent Event [Line Items]                    
Dividends declared per share     $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.12 $ 0.36 $ 0.36
MHC [Member]                    
Subsequent Event [Line Items]                    
Cumulative cash dividends waived                 $ 13,700  
Subsequent Event [Member]                    
Subsequent Event [Line Items]                    
Dividends declared per share   $ 0.13                
Dividends payable, date to be paid   Nov. 19, 2020                
Dividends payable, date of record   Nov. 05, 2020                
Subsequent Event [Member] | MHC [Member]                    
Subsequent Event [Line Items]                    
Equity securities common stock shares owned   3,636,875                
Equity method investment, ownership percentage   62.40%                
Dividend Declared [Member] | Forecast [Member] | MHC [Member]                    
Subsequent Event [Line Items]                    
Aggregate annual dividend to be waived per share $ 0.50                  
Dividends Waived [Member] | MHC [Member]                    
Subsequent Event [Line Items]                    
Cash dividends waived     $ 436           $ 1,300