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Other Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2027
Equity Securities without Readily Determinable Fair Value [Line Items]      
Investments in certain limited partnerships $ 15,800    
Investment Company, Net Assets [Roll Forward]      
Limited partnership investments, beginning of period 13,449 $ 0  
Additions from merger 0 12,803  
Capital contributions 1,035 737  
Pro-rata share in the net income of limited partnerships 2,337 (91)  
Distributions (1,026) 0  
Limited partnership investments, end of period $ 15,795 $ 13,449  
Forecast      
Equity Securities without Readily Determinable Fair Value [Line Items]      
Additional investment     $ 2,200
Certain Limited Partnerships | Minimum      
Equity Securities without Readily Determinable Fair Value [Line Items]      
Partnership interest (as a percentage) 3.00%    
Certain Limited Partnerships | Maximum      
Equity Securities without Readily Determinable Fair Value [Line Items]      
Partnership interest (as a percentage) 5.00%