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Fair Value Disclosures - Additional Information (Details) - USD ($)
 7 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Jun. 02, 2018
Dec. 31, 2017
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Held to maturity securities, Fair Value $ 7,326,000 $ 7,326,000   $ 7,527,000
Level 3        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Held to maturity securities, Fair Value 7,326,000 $ 7,326,000   7,527,000
Level 3 | Minimum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Selling and closing costs for loans as a percentage of appraised value   5.00%    
Real estate selling and closing costs as a percentage of appraised value   5.00%    
Level 3 | Maximum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Selling and closing costs for loans as a percentage of appraised value   8.00%    
Real estate selling and closing costs as a percentage of appraised value   8.00%    
Level 2        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Held to maturity securities, Fair Value       0
Interstate Capital Corporation        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Disposals of contingent consideration   $ 0    
Contingent consideration earnout period   30 months    
Interstate Capital Corporation | Minimum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Contingent consideration recorded at fair value     $ 0  
Interstate Capital Corporation | Maximum        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Contingent consideration recorded at fair value     22,000,000  
Interstate Capital Corporation | Level 3        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Contingent consideration recorded at fair value 20,745,000 $ 20,745,000 $ 20,000,000  
Contingent consideration increase in fair value 745,000      
Fair Value, Measurements, Recurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities, fair value disclosure       0
Fair Value, Measurements, Nonrecurring        
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Liabilities, fair value disclosure $ 0 $ 0   $ 0